Down Payment Calculator: Compare Your Mortgage, PMI, and Monthly Cost
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You find a home listed for $400,000.
A 20% down payment would be $80,000. That is easy enough to calculate. The harder question comes next.
Should you put down the full $80,000?
Maybe $40,000 makes more sense. It leaves cash for closing costs, repairs, and the moving truck that somehow costs twice what you expected. But a smaller down payment creates a larger mortgage. It may also add private mortgage insurance.
This is where the ACS Down Payment Calculator helps.
Enter the home price, your planned down payment, interest rate, loan term, property tax rate, insurance rate, HOA fee, and estimated PMI rate. The calculator then shows:
- Your down payment amount
- Your down payment percentage
- Your mortgage amount
- Your loan-to-value ratio
- Whether PMI may apply
- Your estimated monthly principal and interest
- Property tax
- Home insurance
- HOA fees
- Estimated monthly PMI
- Your total estimated monthly payment
- Estimated interest over the loan term
- Estimated total PMI
- A comparison of different down payment options
It also gives your down payment a general assessment and offers suggestions based on the numbers you enter.
The calculator won’t choose a down payment for you.
It will show you what each choice costs.
What Is a Down Payment?
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A down payment is the part of a home’s purchase price that you pay upfront.
The rest usually comes from a mortgage.
Suppose a home costs $350,000 and you make a $35,000 down payment.
Your down payment percentage is:
$35,000 ÷ $350,000 × 100 = 10%
Your starting mortgage amount is:
$350,000 - $35,000 = $315,000
You own the first $35,000 of the purchase price through your cash contribution. The lender finances the remaining $315,000.
A down payment does not cover every upfront cost.
You may also need money for closing costs, prepaid taxes, insurance, moving, repairs, and other expenses.
What Does a Down Payment Calculator Do?
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A basic calculator may tell you that 10% of $400,000 is $40,000.
The ACS calculator goes further.
It connects your down payment to the rest of the mortgage.
That matters because changing the down payment can change:
- The amount you borrow
- Your monthly principal and interest
- Your LTV
- Whether PMI applies
- The estimated PMI payment
- Total loan interest
- Cash needed upfront
- Cash left after the purchase
A $20,000 difference at closing can affect hundreds of future monthly payments.
The calculator helps you see both sides.
How to Use the Down Payment Calculator
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You need several figures to create a useful estimate.
Some can be rough at first. Replace them with real lender, insurance, tax, and HOA figures as you get closer to buying.
Step 1: Enter the Home Price
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Enter the agreed purchase price or the price of a home you are considering.
For example:
- $250,000
- $400,000
- $650,000
- Another price in your chosen currency
The home price serves as the base for several calculations.
It affects:
- Down payment amount
- Mortgage amount
- LTV
- Property tax estimate
- Insurance estimate
- PMI
- Total monthly cost
Don’t confuse the asking price with the final price.
A home listed for $400,000 could sell for $385,000 or $425,000. Run the calculator again when your offer changes.
Step 2: Enter Your Down Payment
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You can enter the down payment in two ways:
- As a cash amount
- As a percentage
The calculator converts one form into the other.
Entering a cash amount
Suppose the home price is $400,000 and you have $50,000 available.
Enter:
Down payment = $50,000
The calculator finds the percentage:
$50,000 ÷ $400,000 × 100 = 12.5%
Entering a percentage
Suppose you want to test 15% down on the same home.
Enter:
Down payment = 15%
The calculator finds the cash amount:
$400,000 × 0.15 = $60,000
Both methods reach the same result.
Use the amount view when you know how much cash you have. Use the percentage view when you want to compare common mortgage options.
Down Payment Formula
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To calculate the cash amount from a percentage:
Down payment amount = Home price × Down payment percentage
Convert the percentage into decimal form.
For a $500,000 home with 10% down:
$500,000 × 0.10 = $50,000
To calculate the percentage from an amount:
Down payment percentage = Down payment amount ÷ Home price × 100
For a $75,000 down payment on a $500,000 home:
$75,000 ÷ $500,000 × 100 = 15%
Step 3: Enter the Interest Rate
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Enter the annual interest rate you expect to receive.
For example:
- 5.5%
- 6.25%
- 6.5%
- 7%
Your interest rate affects the monthly principal and interest payment. It also changes the total interest paid over the loan term.
Use a current estimate from a lender when possible.
The lowest rate in an advertisement may assume excellent credit, a specific loan size, discount points, or a larger down payment. Your offer may differ.
Interest is only one mortgage cost. Fees, points, mortgage insurance, and closing costs can also change the true cost of a loan. The CFPB recommends comparing formal Loan Estimates rather than comparing advertised rates alone.
Step 4: Choose the Loan Term
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The calculator offers three terms:
- 15 years
- 20 years
- 30 years
A longer term usually produces a lower required monthly payment.
A shorter term usually produces a higher payment but less total interest.
Suppose you borrow $300,000 at 6.5%.
A 30-year term spreads the loan across 360 payments.
A 15-year term spreads it across 180 payments.
The 15-year payment will be much higher because you repay the same principal in half the time. Yet you also spend fewer years paying interest.
The right choice depends on your income, savings goals, job stability, and need for monthly flexibility.
Step 5: Enter the Property Tax Rate
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Enter the estimated annual property tax as a percentage of the home price.
The calculator converts this rate into a monthly amount.
The basic formula is:
Annual property tax = Home price × Property tax rate
Then:
Monthly property tax = Annual property tax ÷ 12
For a $400,000 home with a 1.2% property tax rate:
$400,000 × 0.012 = $4,800 per year
Monthly property tax:
$4,800 ÷ 12 = $400
Use a local estimate.
The seller’s current tax bill may not match your future bill. A sale can trigger reassessment in some areas.
Step 6: Enter the Home Insurance Rate
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The calculator estimates home insurance as a percentage of the home price.
The formula is:
Annual home insurance = Home price × Insurance rate
Then:
Monthly home insurance = Annual insurance ÷ 12
For a $400,000 home with a 0.5% annual insurance estimate:
$400,000 × 0.005 = $2,000 per year
Monthly estimate:
$2,000 ÷ 12 = about $166.67
Use this for early planning.
Before making a final decision, get an actual insurance quote. The cost may depend on the home’s location, age, rebuilding cost, materials, coverage, deductible, and local risks.
Step 7: Enter Monthly HOA Fees
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Enter the monthly homeowners association fee if the property has one.
HOA fees may cover services such as:
- Exterior maintenance
- Landscaping
- Security
- Building insurance
- Shared utilities
- Parking
- Pools
- Gyms
- Reserve funds
A $350 monthly HOA fee adds $4,200 to your yearly housing cost.
That is not a small detail.
Two condos with the same purchase price can have very different monthly costs when one charges $100 per month and the other charges $600.
Step 8: Enter an Estimated PMI Rate
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The calculator includes an annual PMI rate field.
Its interface suggests that PMI may commonly fall within an estimated range of 0.5% to 1.5% of the loan amount, though your actual premium depends on the lender, credit profile, loan, down payment, insurer, and other factors.
Enter the estimate supplied by a lender when possible.
For a rough example, suppose:
- Mortgage amount: $360,000
- Estimated annual PMI rate: 0.5%
Annual PMI estimate:
$360,000 × 0.005 = $1,800
Monthly PMI:
$1,800 ÷ 12 = $150
The calculator adds this estimate to the monthly payment when PMI applies.
Understanding Your Down Payment Results
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Once you enter your figures, the calculator displays several connected results.
Each tells you something different.
Down Payment Amount
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This is the cash portion of the home price that you plan to pay upfront.
Suppose:
- Home price: $400,000
- Down payment: 10%
Your down payment amount is:
$400,000 × 10% = $40,000
This amount does not include closing costs or other money needed at purchase.
Down Payment Percentage
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This shows your down payment as a share of the home price.
Suppose:
- Home price: $400,000
- Down payment amount: $60,000
The percentage is:
$60,000 ÷ $400,000 × 100 = 15%
The amount and percentage describe the same cash contribution.
Mortgage Amount
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The mortgage amount is the part of the purchase price financed by the loan.
The formula is:
Mortgage amount = Home price - Down payment
For a $400,000 home with $40,000 down:
$400,000 - $40,000 = $360,000
The estimated loan amount is $360,000.
Your final loan may differ if you finance fees or use credits and other adjustments.
Home Price Breakdown
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The calculator’s price chart divides the home into:
- Your down payment
- Your mortgage amount
For a $400,000 home with 10% down:
- Down payment: $40,000
- Mortgage: $360,000
The chart makes the split easy to see.
A 10% down payment may feel substantial in cash. On the chart, you can see that the lender still finances 90% of the purchase price.
What Is Loan-to-Value Ratio?
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Loan-to-value ratio, or LTV, compares the mortgage amount with the home’s value or purchase price.
The basic formula is:
LTV = Mortgage amount ÷ Home price × 100
For a $360,000 mortgage on a $400,000 home:
$360,000 ÷ $400,000 × 100 = 90%
Your LTV is 90%.
The down payment percentage and LTV normally add up to 100% at purchase:
10% down + 90% LTV = 100%
The calculator displays your LTV and marks whether PMI may be required.
LTV Examples
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Down paymentStarting LTV3%97%5%95%10%90%15%85%20%80%25%75%
A lower LTV means you borrow a smaller share of the home’s price.
A higher LTV means the lender finances more of the purchase.
What Is Private Mortgage Insurance?
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Private mortgage insurance, or PMI, is insurance that may apply to a conventional mortgage when the down payment is less than 20%.
It protects the lender if the borrower stops paying. It does not protect your home or make your mortgage payments for you. PMI can make a smaller down payment possible, but it raises the cost of the loan.
The most common payment method is a monthly premium added to the mortgage payment. Some loans may use an upfront premium or a mix of upfront and monthly payments.
The ACS calculator estimates monthly and total PMI using the rate you enter.
Actual PMI terms can differ.
Check your Loan Estimate and Closing Disclosure.
Does a 20% Down Payment Avoid PMI?
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On a conventional loan, a 20% down payment generally avoids PMI.
For a $400,000 home:
20% down = $80,000
Mortgage amount:
$400,000 - $80,000 = $320,000
Starting LTV:
$320,000 ÷ $400,000 × 100 = 80%
The CFPB states that PMI is not required on a conventional loan when you pay 20% down. A larger down payment may also help you receive a lower interest rate, though lender pricing varies.
This does not mean everyone should wait until they have 20%.
A smaller down payment may make sense when waiting would take many years, home prices are changing, or you need to keep cash available.
The tradeoff is a larger loan and possibly mortgage insurance.
Monthly Principal and Interest
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The calculator estimates the monthly principal and interest payment using:
- Mortgage amount
- Interest rate
- Loan term
Principal reduces the loan balance.
Interest is the cost of borrowing.
A standard fixed mortgage payment uses this formula:
M = P × \[r(1 + r)ⁿ\] ÷ \[(1 + r)ⁿ - 1\]
Where:
- M is the monthly principal and interest
- P is the mortgage amount
- r is the monthly interest rate
- n is the number of monthly payments
You don’t need to calculate this by hand. The calculator does it for you.
Total Monthly Payment
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The calculator adds several costs:
Total monthly payment = Principal and interest + Property tax + Home insurance + HOA + PMI
PMI appears only when the calculator determines that it applies. HOA appears only when you enter an amount.
Suppose the monthly figures are:
- Principal and interest: $2,275
- Property tax: $400
- Home insurance: $167
- HOA: $0
- PMI: $150
Total:
$2,275 + $400 + $167 + $150 = $2,992
That is a much better planning number than the $2,275 mortgage payment alone.
It still may not include every cost of ownership.
Costs Not Included in the Monthly Result
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The calculator has no visible input for:
- Utilities
- Routine maintenance
- Major repairs
- Flood insurance
- Earthquake insurance
- Moving costs
- Closing costs
- Furniture
- Renovations
You need to budget for these separately.
A mortgage may cost $2,500 per month. The home may still need a $12,000 roof, a $2,000 water heater, or $300 more per month in utilities than your current apartment.
Ownership has a long receipt.
Estimated Total Interest
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The calculator shows the estimated interest paid over the selected loan term.
This helps you see how the down payment affects the long-term cost.
Suppose two buyers purchase the same home at the same interest rate.
Buyer A puts down $20,000.
Buyer B puts down $80,000.
Buyer A borrows $60,000 more. That extra principal creates extra interest across the loan.
The difference may become large over 30 years.
Total interest assumes you keep the loan for the full term and make the scheduled payments. Selling, refinancing, making extra payments, or changing the loan can alter the actual amount.
Estimated Total PMI
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The calculator also reports estimated total PMI.
This figure gives you a sense of the possible long-term cost of choosing a smaller down payment.
Actual PMI may end based on your loan terms, payment history, principal balance, and applicable rules. The calculator’s estimate should not replace your PMI disclosure or lender documents.
For many eligible US conventional mortgages, you can request PMI cancellation when the scheduled principal balance reaches 80% of the home’s original value, subject to conditions. Automatic termination generally occurs when the scheduled balance reaches 78%, provided payments are current. FHA and VA loans follow different insurance rules.
Down Payment Assessment
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The calculator labels the down payment assessment with a result such as:
- Excellent
- Good
- Fair
- Poor
It also displays a message and recommendations.
Use this as a quick summary.
The assessment cannot see:
- Your income
- Your monthly debt
- Your emergency fund
- Your credit score
- Your job stability
- Closing costs
- Repairs
- Your other financial goals
A 20% down payment can look excellent inside the calculator.
It may be a poor personal choice if it leaves you with $200 in the bank after closing.
Comparing 5%, 10%, and 20% Down
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Consider a $400,000 home with these assumptions:
- Interest rate: 6.5%
- Loan term: 30 years
- Property tax rate: 1.2%
- Home insurance rate: 0.5%
- Estimated PMI rate: 0.5%
- No HOA fee
These figures are close to the calculator’s default example.
Initial monthly comparison
| Down payment | Cash upfront | Loan amount | Starting LTV | Principal and interest | Initial PMI estimate | Estimated monthly total |
|---|---|---|---|---|---|---|
| 5% | $20,000 | $380,000 | 95% | About $2,402 | About $158 | About $3,127 |
| 10% | $40,000 | $360,000 | 90% | About $2,275 | About $150 | About $2,992 |
| 20% | $80,000 | $320,000 | 80% | About $2,023 | $0 | About $2,589 |
The monthly total includes estimated property tax of $400 and home insurance of about $167.
These are planning examples, not lender quotes.
The 20% option requires $60,000 more cash than the 5% option. In return, it lowers the initial monthly estimate by roughly $538 and avoids the assumed PMI.
That sounds attractive.
Now look at the cash side.
If you have $90,000 in total savings, putting $80,000 down leaves only $10,000 before closing costs, moving, and repairs.
A 10% down payment leaves $50,000 more available.
The smaller payment is valuable. So is cash in the bank.
Is 20% Down Always Best?
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Not automatically.
Putting down 20% can offer several benefits:
- Smaller mortgage
- Lower monthly principal and interest
- No PMI on a conventional mortgage
- Lower starting LTV
- Less total interest
- More equity from the start
It also has a cost.
The money becomes part of your home equity. You can’t spend home equity at the grocery store or use it to repair the car without selling the home or borrowing against it.
The CFPB advises buyers to keep money aside for closing costs, moving, renovations, other savings goals, and an emergency cushion. It also notes that money placed into the home may not be easy to access later.
Twenty percent may be the right answer.
It just isn’t the only answer.
Is a 5% Down Payment Too Low?
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A 5% down payment may allow you to buy sooner and keep more cash.
For a $400,000 home:
5% down = $20,000
That leaves more money available for:
- Closing costs
- Repairs
- Emergency savings
- Furniture
- Moving
- Other goals
The tradeoffs may include:
- Larger mortgage
- Higher payment
- Higher total interest
- PMI
- Less starting equity
- More exposure if the home’s value falls
A low down payment does not automatically make a purchase irresponsible.
The full monthly payment and remaining savings matter more than the percentage alone.
Is 10% Down a Useful Middle Ground?
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Ten percent often sits between the cash burden of 20% and the higher loan cost of a very small down payment.
For a $400,000 home:
10% down = $40,000
You borrow $360,000.
You may still pay PMI, but the mortgage and PMI estimate are lower than with 5% down.
The CFPB notes that down payments can affect loan pricing in 5% steps. It suggests that moving from a figure such as 8% to 10% may produce better loan pricing in some cases, though actual offers vary by lender.
Ask lenders for side-by-side quotes.
Compare 5%, 10%, 15%, and 20% using the same home price and loan type.
You Don’t Always Need 20% Down
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The idea that every buyer needs 20% is wrong.
For US buyers, the CFPB says many mortgages require at least 3%, while many loan types and lenders require 5% or more. Conventional programs backed by Fannie Mae or Freddie Mac may allow down payments as low as 3% for eligible borrowers. Lower down payment options may carry higher costs.
FHA loans can allow a down payment as low as 3.5% for qualifying buyers and properties.
The Department of Veterans Affairs generally does not require a down payment for an eligible VA-guaranteed home loan, though a lender may require one in some cases.
These examples apply to the United States.
Loan programs, minimum deposits, insurance rules, and buyer support differ by country.
PMI vs. Mortgage Insurance on Other Loans
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PMI usually refers to private mortgage insurance on conventional loans.
FHA loans use mortgage insurance with their own rules.
VA loans use a guaranty structure and do not charge conventional PMI. Other fees may apply.
The calculator uses one general estimated PMI field. It does not model every loan program’s insurance rules.
Before comparing loans, ask each lender for:
- Upfront insurance costs
- Monthly insurance costs
- How long the insurance lasts
- Whether it can be removed
- Interest rate
- Loan fees
- Total cash needed
- Total payment
A low down payment loan may still be a good option.
You need the complete cost.
Closing Costs Are Separate
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Your down payment is not your full cash-to-close amount.
Closing costs may include:
- Lender fees
- Appraisal
- Credit report
- Title services
- Legal or settlement fees
- Government recording charges
- Prepaid interest
- Property tax
- Home insurance
- Other required costs
The CFPB says closing costs often range from 2% to 5% of the purchase price, separate from the down payment. Actual costs depend on the home, loan, lender, and location.
For a $400,000 home:
- 2% = $8,000
- 5% = $20,000
A buyer planning a $40,000 down payment may need $48,000 to $60,000 before moving and repairs.
Cash Needed at Closing Formula
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A rough estimate is:
Cash needed = Down payment + Closing costs + Prepaid costs - Credits and deposits already paid
Suppose:
- Down payment: $40,000
- Closing costs: $12,000
- Prepaid tax and insurance: $3,000
- Earnest money already paid: $5,000
- Seller credit: $2,000
Estimated cash still needed:
$40,000 + $12,000 + $3,000 - $5,000 - $2,000 = $48,000
The final Closing Disclosure will provide a more exact amount.
Keep an Emergency Cushion
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The keys change hands. You walk into the home.
Three days later, the refrigerator stops cooling.
A month later, heavy rain reveals a leak near the window.
This is normal homeownership, though it rarely arrives at a polite time.
Don’t use every dollar for the down payment.
The CFPB suggests setting aside money for moving, initial home expenses, other goals, and an emergency cushion. Its current guidance uses three to six months of expenses as a general rule of thumb for that cushion.
Your own target may differ.
A household with one uncertain income may need more cash than a household with two stable incomes.
Down Payment vs. Emergency Fund Example
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Suppose you have $100,000 in savings and want to buy a $400,000 home.
Option A: Put 20% down
- Down payment: $80,000
- Estimated closing costs: $12,000
- Cash left: $8,000
Option B: Put 10% down
- Down payment: $40,000
- Estimated closing costs: $12,000
- Cash left: $48,000
Option A creates a smaller loan and avoids conventional PMI.
Option B creates a larger payment but leaves a much larger reserve.
The better option depends on:
- Your income
- PMI quote
- Interest rate
- Job security
- Repair risks
- Other debts
- Comfort with a smaller cash reserve
Run both scenarios.
Then ask lenders to price both.
How a Larger Down Payment Reduces Interest
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A larger down payment reduces the principal that earns interest.
Consider a 30-year loan at 6.5% on a $400,000 home.
10% down
- Mortgage: $360,000
- Estimated total interest if held for 30 years: About $459,160
20% down
- Mortgage: $320,000
- Estimated total interest if held for 30 years: About $408,142
Difference:
About $51,018 less interest
This assumes the same rate and scheduled payments for the full term.
Real lender pricing may also give a different rate based on the down payment, which could widen or narrow the gap.
A Larger Down Payment Can Lower More Than the Loan
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A higher down payment may affect:
- Mortgage amount
- Interest rate
- Loan fees
- PMI
- Monthly payment
- Total interest
The CFPB states that higher down payments generally reduce loan costs. It also notes that buyers often save more at 10% and save the most at 20%, though actual offers depend on the lender and loan.
Ask for actual numbers.
A lender should be able to show how the offer changes at several down payment levels.
Should You Wait and Save More?
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Waiting may help you:
- Reach a lower LTV
- Avoid PMI
- Reduce the loan
- Improve credit
- Build closing cash
- Keep a stronger emergency fund
Waiting also carries uncertainty.
During that time:
- Home prices may rise or fall
- Interest rates may rise or fall
- Rent continues
- Your income may change
- Your preferred home may sell
- Your family needs may change
There is no universal answer.
Compare two plans.
Buy now
Calculate:
- Current down payment
- Current rate
- Current home price
- PMI
- Cash left after closing
Buy later
Estimate:
- Future savings
- Possible home price
- Possible rate
- Rent paid while waiting
- Future cash reserve
Be cautious with future guesses. A calculator can model them, not guarantee them.
How Long Will It Take to Save a Down Payment?
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Use this formula:
Months needed = Remaining savings goal ÷ Monthly savings
Suppose:
- Down payment goal: $60,000
- Current down payment savings: $24,000
- Monthly savings: $1,500
Remaining goal:
$60,000 - $24,000 = $36,000
Time needed:
$36,000 ÷ $1,500 = 24 months
That is two years.
Now include closing costs.
If you also need $15,000 for closing:
Total cash goal = $60,000 + $15,000 = $75,000
Remaining amount:
$75,000 - $24,000 = $51,000
Time needed:
$51,000 ÷ $1,500 = 34 months
The target changed from two years to almost three.
That is why down payment planning must include more than the deposit.
How to Save for a Down Payment
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Start with a clear target.
Break it into four parts:
1. Down payment
2. Closing costs
3. Moving and initial repairs
4. Emergency savings
Suppose your target looks like this:
GoalAmountDown payment$50,000Closing costs$12,000Moving and setup$3,000Emergency fund$20,000Total goal$85,000
Now the plan reflects the purchase, not just one part of it.
You can then:
- Set an automatic monthly transfer
- Save bonuses
- Reduce a recurring expense
- Choose a lower home price
- Delay a large optional purchase
- Review local assistance programs
- Direct part of a raise toward the goal
Don’t place money needed soon into investments that could fall sharply before you buy.
The right place for short-term savings depends on your country, timeline, deposit protection, access needs, and risk.
Down Payment Assistance
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Some state, local, employer, lender, and nonprofit programs help eligible buyers with down payments or closing costs.
Support may come as:
- A grant
- A forgivable loan
- A deferred loan
- A low-interest second loan
- Matched savings
- A lender credit
Terms differ.
Some programs require you to:
- Use an approved lender
- Complete buyer education
- Meet income limits
- Buy in a set area
- Live in the home
- Remain for a minimum period
- Repay assistance after selling
The CFPB advises eligible buyers to look into local assistance and speak with a housing counselor.
Don’t assume the money is a gift until you read the repayment terms.
PMI Cancellation
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PMI does not always last for the full mortgage term.
For many US conventional mortgages covered by the Homeowners Protection Act, you can request cancellation when the principal balance is scheduled to reach 80% of the home’s original value. You may need to make a written request, stay current, have a good payment history, show that no junior liens exist, and provide evidence that the property value has not fallen.
Automatic termination generally occurs when the scheduled principal balance reaches 78% of the original value, as long as the borrower is current.
These rules do not apply the same way to every mortgage.
FHA, VA, lender-paid mortgage insurance, and other loan structures may follow different rules.
Ask your servicer.
Original LTV vs. Current LTV
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At purchase, the calculator uses the home price and mortgage amount to estimate LTV.
Later, your situation can change.
Your loan balance may fall.
Your property value may rise or fall.
This creates two possible views:
Original-value LTV
Current loan balance ÷ Original property value
Current-value LTV
Current loan balance ÷ Current property value
PMI cancellation rights may depend on the original value and scheduled balance, though a lender or loan program may offer other options.
Don’t assume a higher estimated home value automatically removes PMI.
Contact the loan servicer and ask about its process.
What Does the Scenario Comparison Show?
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The calculator creates several down payment scenarios.
For each one, it can compare:
- Down payment percentage
- Cash amount
- Estimated monthly payment
- Estimated PMI
- Estimated total cost from interest and PMI
The chart and table let you compare the options without re-entering every value.
The lowest monthly payment is not always the best choice.
The lowest cash requirement is not always the best choice either.
Look at:
- Cash needed today
- Payment next month
- Total cost over time
- Cash remaining after closing
Those four numbers tell the real story.
Down Payment Calculator vs. House Affordability Calculator
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These calculators answer different questions.
Down Payment Calculator
Use it when you already have a home price and want to compare down payment options.
It focuses on:
- Down payment
- Mortgage amount
- LTV
- PMI
- Monthly payment
- Interest
- Scenario costs
House Affordability Calculator
Use it when you want to estimate a suitable home price based on:
- Income
- Monthly debts
- Down payment
- Mortgage terms
- Property costs
The Down Payment Calculator does not ask for your income or debt. It cannot tell you whether the resulting payment fits your household budget.
Use both tools when planning a purchase.
Common Down Payment Mistakes
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Believing 20% Is Always Required
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Many buyers can qualify with less.
The real question is how the smaller down payment changes the rate, mortgage insurance, monthly payment, and total cost.
Looking Only at the Percentage
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Ten percent sounds simple.
On a $250,000 home, it is $25,000.
On a $900,000 home, it is $90,000.
Always convert the percentage into cash.
Forgetting Closing Costs
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A buyer with exactly enough for the down payment may still be short at closing.
Estimate closing costs separately.
Emptying Every Account
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A large down payment can reduce the mortgage but leave you unable to handle a repair.
Keep a reserve.
Ignoring PMI
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A smaller down payment may add a monthly premium.
Include it when comparing payments.
Assuming PMI Protects You
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PMI protects the lender.
You can still lose the home if you stop paying.
Comparing Payments With Different Assumptions
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Use the same:
- Home price
- Interest rate
- Term
- Tax rate
- Insurance rate
- HOA fee
Then change only the down payment.
Otherwise, you won’t know what caused the difference.
Using the Original Home Price After Negotiation
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Update the calculator when the offer price changes.
A lower price reduces both the down payment amount and mortgage.
Ignoring the Loan Term
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A 15-year payment and a 30-year payment cannot be compared as if they are the same loan.
One has a higher monthly payment and a shorter repayment period.
Treating Estimated PMI as a Quote
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The calculator uses the rate you enter.
Your lender and insurer decide the actual premium.
Forgetting That Taxes and Insurance Can Rise
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A fixed-rate mortgage can keep principal and interest stable.
Property tax, insurance, HOA fees, and other costs may still increase.
Counting Investment Money Twice
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If you plan to sell investments for the down payment, don’t also count those investments as part of your remaining emergency savings.
Once spent, the money is gone from the account.
How Often Should You Recalculate?
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Run the calculator again when:
- The home price changes
- Your available cash changes
- The interest rate changes
- You choose another loan term
- You receive a property tax estimate
- You receive an insurance quote
- You learn the HOA fee
- A lender quotes PMI
- You find down payment assistance
- Closing costs become clearer
Early estimates help you plan.
Updated estimates keep the plan honest.
Questions to Ask a Mortgage Lender
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Bring several down payment scenarios to a lender.
Ask:
- What is the rate at 5%, 10%, 15%, and 20% down?
- Does the rate change at each level?
- How much PMI will I pay?
- Is PMI monthly, upfront, or both?
- When can PMI end?
- What is the APR?
- Are discount points included?
- What are total closing costs?
- How much cash is required at closing?
- Is a lower down payment program available?
- Can gift funds or assistance be used?
- Are there prepayment penalties?
- What changes if the appraisal is lower than the price?
Ask for Loan Estimates when appropriate.
Numbers written on official documents are more useful than numbers mentioned during a quick phone call.
Frequently Asked Questions
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What is a down payment calculator?
A down payment calculator shows how much cash you need to put down on a home and how that choice affects your mortgage, LTV, PMI, monthly payment, and total loan cost.
How do I calculate a house down payment?
Use:
Down payment = Home price × Down payment percentage
For a $300,000 home with 10% down:
$300,000 × 0.10 = $30,000
How do I calculate the down payment percentage?
Use:
Down payment percentage = Cash down payment ÷ Home price × 100
For $45,000 down on a $300,000 home:
$45,000 ÷ $300,000 × 100 = 15%
How much is 20% down on a $400,000 house?
$400,000 × 0.20 = $80,000
The starting mortgage would be $320,000 before other financed costs.
How much is 10% down on a $400,000 house?
$400,000 × 0.10 = $40,000
The starting mortgage would be $360,000.
How much is 5% down on a $400,000 house?
$400,000 × 0.05 = $20,000
The starting mortgage would be $380,000.
What is LTV?
LTV means loan-to-value ratio.
Use:
LTV = Mortgage amount ÷ Home price × 100
A $360,000 mortgage on a $400,000 home has a 90% LTV.
Is 80% LTV the same as 20% down?
At the time of purchase, yes, when the mortgage and down payment cover the full price.
A 20% down payment leaves an 80% mortgage.
Do I need 20% down to buy a house?
Not always.
Eligible US buyers may find conventional options with as little as 3%, FHA financing with as little as 3.5%, and certain VA loans with no VA-required down payment. Rules and costs vary.
What happens if I put down less than 20%?
You borrow more and may need mortgage insurance.
The monthly payment and total interest may also rise.
What is PMI?
PMI is private mortgage insurance.
It may apply to a conventional loan with less than 20% down. It protects the lender, not the borrower.
How is monthly PMI calculated?
A rough estimate is:
Monthly PMI = Mortgage amount × Annual PMI rate ÷ 12
A $360,000 mortgage with a 0.5% estimate gives:
$360,000 × 0.005 ÷ 12 = $150 per month
Your actual premium may differ.
When can PMI be removed?
For many eligible US conventional mortgages, you may request cancellation when the scheduled principal balance reaches 80% of the original value, subject to conditions. Automatic termination generally occurs at 78% when payments are current. Other loan types follow different rules.
Does the calculator include PMI?
Yes.
It estimates PMI using the annual rate you enter and shows whether PMI may be required.
Does the calculator include property tax?
Yes.
It estimates monthly property tax from the annual rate you enter.
Does it include home insurance?
Yes.
It estimates insurance using the annual rate entered.
Does it include HOA fees?
Yes.
Enter the monthly HOA fee, and the calculator adds it to the monthly estimate.
Does it include closing costs?
No visible closing-cost input appears in the calculator.
Estimate them separately.
Does it include maintenance?
No.
Set aside a separate amount for repairs and upkeep.
Does a larger down payment lower the monthly payment?
Yes, assuming the other inputs remain the same.
A larger down payment reduces the mortgage amount. It may also reduce or remove PMI.
Does a larger down payment lower the interest rate?
It may.
Lenders price loans based on many factors, including down payment and LTV. Ask for actual quotes at several down payment levels.
Should I put down more or keep cash?
Compare:
- Interest saved
- PMI avoided
- Monthly payment reduction
- Emergency savings
- Closing costs
- Upcoming repairs
- Other financial goals
There is no one answer for every buyer.
Can I use borrowed money for a down payment?
Loan programs have rules about acceptable down payment sources.
Borrowed money may also create another monthly debt payment. Ask the lender before relying on it.
Can I use gift money?
Some loan programs allow gift funds under certain conditions and may require documentation.
Ask the lender what rules apply.
What happens if the appraisal is below the purchase price?
The lender may base its loan decision on the lower appraised value.
You may need to renegotiate, increase cash, change the loan, or leave the purchase if your contract permits.
Is the lowest monthly payment always the best option?
No.
It may require much more cash upfront.
Compare both the monthly payment and the cash left after closing.
What does total cost mean in the scenario chart?
The calculator’s scenario chart compares estimated interest and PMI costs across different down payment choices.
It does not include every possible ownership or transaction cost.
Can I use this calculator outside the United States?
Yes.
Select your currency and enter local rates and costs.
PMI rules, mortgage products, deposit requirements, taxes, and insurance differ by country, so treat US-specific sections as examples only.
Is the calculator a mortgage approval?
No.
It provides estimates.
A lender will review income, debt, credit, assets, property details, and loan rules.
Choose a Down Payment That Leaves You Standing
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A larger down payment can lower your mortgage, reduce interest, and remove PMI.
That is only half the decision.
The other half sits in your bank account after closing.
Suppose 20% down gives you the lowest payment but leaves no room for closing costs or repairs. A smaller down payment may cost more each month, yet leave you with enough cash to sleep at night when the plumbing starts making a noise at 2 a.m.
Run several scenarios.
Try 5%.
Try 10%.
Try 20%.
Compare the cash needed, loan amount, PMI, monthly payment, total interest, and money left in reserve.
The best down payment isn’t always the largest one.
It is the amount that makes the mortgage manageable without leaving the rest of your financial life empty.
_This calculator and article provide general educational estimates. They do not provide mortgage approval, lending, tax, insurance, legal, real estate, or personal financial advice. Loan terms, PMI rules, costs, and assistance programs vary by lender, location, borrower, and loan type._
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