Mortgage affordability calculator
Enter your own assumptions below. The default interest rate is 7.03%, Freddie Mac's national average for a 30-year fixed-rate mortgage on September 24, 2026. Your actual rate and lender guidelines can be different.
Planning estimate only. It is not a preapproval, loan offer or underwriting decision.
The calculator uses your target total debt-to-income ratio as a planning limit. Fannie Mae's manual underwriting guidance, for example, generally uses a 36% maximum total DTI and allows up to 45% in certain cases with additional requirements. Other programs and lenders can use different rules, so keep the DTI field editable rather than treating one percentage as universal.
How this mortgage affordability calculator works
The calculator first estimates the maximum amount of your gross monthly income that you want devoted to total monthly debt. It subtracts your existing debt payments, then subtracts recurring housing costs you entered—property taxes, homeowners insurance, HOA dues and mortgage insurance. The amount left is the estimated monthly budget for mortgage principal and interest.
That principal-and-interest budget is converted into a maximum loan amount using the mortgage rate and term you selected. Your down payment is then added to estimate a home-price range.
Which income should you enter?
Use gross income before taxes and other payroll deductions for the calculator. CFPB and Fannie Mae describe debt-to-income calculations using gross monthly income. For a household with more than one borrower, include only income you reasonably expect a lender to consider and that you are prepared to document.
Variable pay, bonuses, commissions, self-employment income and other non-salary income may require additional documentation or averaging under lender rules. The calculator does not determine whether a particular income source is eligible for underwriting.
A useful checkpoint is to save the numbers used for Which income should you enter? and date them. Mortgage quotes and approvals are snapshots, and the assumptions behind them can change. Revisit the same figures after any material update to income, debt, property value, loan amount, rate, credits or closing date. That simple record makes it easier to identify whether a later change comes from the market, the lender, the borrower profile or the transaction itself.
How debt-to-income ratio changes mortgage affordability
Your debt-to-income ratio (DTI) is your monthly debt payments divided by gross monthly income. Existing obligations can reduce the amount available for a future mortgage payment even when two buyers earn the same salary.
| Gross annual income | Monthly debts before housing | 36% total-DTI budget left for housing |
|---|---|---|
| $90,000 | $500 | $2,200/mo |
| $120,000 | $700 | $2,900/mo |
| $150,000 | $1,200 | $3,300/mo |
These figures are examples, not approval thresholds. Different loan programs and automated underwriting systems can produce different acceptable ratios based on the full application.
For a cleaner decision, test How debt-to-income ratio changes mortgage affordability with three cases: the current estimate, a slightly less favorable case and a case with more cash kept in reserve. The purpose is not to predict the future perfectly. It is to see whether the plan still works when the numbers are not ideal. If the budget only works in the most optimistic case, the mortgage structure may be too tight even if it technically qualifies.
Include the full monthly housing cost
A common affordability mistake is to budget only for principal and interest. CFPB guidance emphasizes that the monthly cost of owning a home can also include property taxes, homeowners insurance and mortgage insurance. HOA or condo dues may be another recurring expense.
| Cost | How to enter it | Why it matters |
|---|---|---|
| Property taxes | Annual estimate | Highly local and may change after purchase |
| Homeowners insurance | Annual premium estimate | Varies by property, coverage and location |
| HOA / condo dues | Monthly charge | Reduces room available for mortgage P&I |
| Mortgage insurance | Monthly lender estimate | May apply depending on loan type and equity |
Keep the written disclosure or lender explanation that supports Include the full monthly housing cost. If the final terms differ, compare the old and new versions line by line instead of relying on memory. Look for changes in rate, points, lender credits, loan amount, projected payment, cash to close and any condition that affects eligibility. This is particularly important when several lenders or loan structures are being compared at the same time.
Mortgage rates can change your buying power
Interest rate is one of the strongest inputs in a mortgage affordability calculator. With the same monthly principal-and-interest budget, a higher rate supports a smaller loan amount and a lower rate supports a larger one.
Freddie Mac reported a national average 7.03% 30-year fixed rate for the week of September 24, 2026. That survey is a market reference—not a personalized quote. Credit profile, points, loan type, occupancy, down payment and lender pricing can all change the rate you receive.
| 30-year rate | Approx. loan supported by $2,250 P&I | Difference vs. 7.03% |
|---|---|---|
| 6.00% | $375,300 | +$38,100 |
| 7.03% | $337,200 | Baseline |
| 8.00% | $306,600 | −$30,600 |
A mortgage decision is stronger when Mortgage rates can change your buying power is connected to the household’s wider cash plan. Include the money needed before closing, the amount that should remain afterward, and the monthly obligations that continue regardless of the mortgage. That broader view helps prevent a technically attractive loan from crowding out repairs, insurance deductibles, moving costs or other predictable expenses that arrive after the transaction.
How the down payment affects what you can afford
A larger down payment reduces the amount you need to borrow and can increase the home price that fits the same monthly principal-and-interest budget. It may also change mortgage-insurance costs. CFPB notes that borrowers putting less than 20% down on some conventional mortgages may need private mortgage insurance.
Do not put every available dollar into the down payment. Fannie Mae's consumer guidance notes that buyers should also plan for closing costs, moving expenses and unexpected ownership costs. Keep cash reserves in the affordability decision.
When two options look close, use How the down payment affects what you can afford as a question for the lender rather than making an assumption. Ask what would cause this item to change, when it becomes final, whether there is a fee to alter it and how it appears on the Loan Estimate or Closing Disclosure. A clear written answer is more useful than a verbal promise because it can be checked against later documents.
15-year vs. 30-year affordability
A 30-year mortgage spreads repayment across more monthly payments, usually lowering the required principal-and-interest payment for a given loan amount. A 15-year loan usually requires a higher monthly payment but can reduce total interest if its rate and other terms are favorable.
For affordability, changing the term can materially change the maximum loan supported by the same payment budget. Use the calculator's term field to compare 15-, 20- and 30-year scenarios instead of assuming the lowest monthly payment is automatically the best financial fit.
Do not change several variables at once when testing 15-year vs. 30-year affordability. For example, if the interest rate, down payment and loan term all change together, it becomes difficult to tell what caused the new payment or cash-to-close figure. Hold the other inputs constant, change one variable, record the result, and then move to the next variable. This produces a more reliable comparison and reduces the risk of choosing an option for the wrong reason.
Affordable to the lender vs. comfortable for you
CFPB explicitly distinguishes the amount a lender may be willing to lend from the amount that fits comfortably in your life. A lender does not know every household priority. Childcare, retirement saving, travel, medical costs, utilities and future repairs can all make a technically qualifying payment feel too high.
A practical stress test is to lower the calculator's DTI target, raise the assumed interest rate slightly, and increase estimated taxes or insurance. If the home still fits, the budget has more resilience.
The most useful number for Affordable to the lender vs. comfortable for you is the one based on the actual transaction rather than a generic advertisement. Replace national averages and sample figures with property-specific taxes, realistic insurance, the real loan amount, current debts and the lender’s documented fees as soon as they are available. The closer the inputs are to the actual file, the more useful the comparison becomes for a final decision.
Mortgage affordability examples
The examples below use a 30-year fixed mortgage at 7.03%, a 36% total-DTI planning target, and assume the listed taxes and insurance. They are illustrations rather than lender quotes.
| Annual income | Monthly debts | Other housing costs | P&I budget | Approx. loan |
|---|---|---|---|---|
| $90,000 | $500 | $550/mo | $1,650/mo | ≈ $247,300 |
| $120,000 | $700 | $650/mo | $2,250/mo | ≈ $337,200 |
| $150,000 | $1,200 | $800/mo | $2,500/mo | ≈ $374,600 |
Add your down payment to the estimated loan amount to get a rough home-price range, then subtract any cash you need to reserve for closing costs and emergency savings from the amount available upfront.
Before closing, revisit Mortgage affordability examples one final time with the latest documents. Confirm that any credit, assistance, payoff, escrow amount or lender charge you expected is still present and that no new condition has changed the economics of the loan. If something is different, ask for the reason and calculate the effect in dollars rather than judging the change only by whether the rate or monthly payment moved slightly.
Mortgage affordability checklist before you shop
- Use gross, documentable household income.
- Include recurring monthly debt payments rather than guessing.
- Estimate property taxes for the actual area and price range you are considering.
- Get a realistic homeowners-insurance estimate, especially in higher-risk areas.
- Add HOA or condo dues when applicable.
- Include mortgage insurance when your loan structure may require it.
- Run at least two interest-rate scenarios.
- Keep a separate cash reserve for closing costs, moving and repairs.
- Compare your comfortable payment with lender preapproval rather than treating them as the same number.
A useful checkpoint is to save the numbers used for Mortgage affordability checklist before you shop and date them. Mortgage quotes and approvals are snapshots, and the assumptions behind them can change. Revisit the same figures after any material update to income, debt, property value, loan amount, rate, credits or closing date. That simple record makes it easier to identify whether a later change comes from the market, the lender, the borrower profile or the transaction itself.
Principal and interest vs. the full monthly housing payment
Principal and interest are only part of the amount a homeowner may need to budget each month. Taxes, homeowners insurance, mortgage insurance and HOA charges can materially change the total.
Use a full-payment estimate when testing affordability, and keep the principal-and-interest figure separate so you can see which component is changing.
This prevents a low advertised loan payment from being mistaken for the household’s complete monthly housing cost.
Principal and interest are only part of the monthly housing cost. Property taxes, homeowners insurance, mortgage insurance when applicable, HOA dues and other recurring charges can materially change the amount that leaves the household budget each month. Keep the loan payment and the full housing payment separate when comparing scenarios so the source of each change is visible.
Escrowed taxes and insurance can change after closing even when the principal-and-interest payment on a fixed-rate mortgage does not. Use current property-specific estimates when possible and leave room for increases. A mortgage can look affordable on principal and interest alone but become tight once the complete housing cost is included.
Property taxes and homeowners insurance in the monthly budget
Property taxes and homeowners insurance vary by property and location and can change after the loan closes, even when the mortgage rate is fixed.
Use property-specific tax information when available, obtain an insurance estimate early and remember that an escrow shortage can change the monthly amount collected by the servicer.
Leave room for these costs to rise so the budget is not built only around the first-year estimate.
Property taxes and homeowners insurance are separate from the mortgage rate, but they belong in the affordability calculation. Tax bills can differ substantially between properties, and insurance premiums depend on the home, location, coverage and insurer. Obtain property-specific figures early instead of using a broad percentage if the decision is close.
If the lender escrows taxes and insurance, the monthly amount collected can change when those bills change. An escrow analysis can therefore raise or lower the payment even on a fixed-rate mortgage. Compare the complete monthly housing cost and keep a buffer for future tax or insurance increases rather than treating the first-year estimate as permanent.
Mortgage insurance and down-payment trade-offs
A smaller down payment can preserve cash but may add mortgage-insurance or program-guarantee costs, depending on the loan type.
Compare both upfront and recurring charges and ask when, if ever, a monthly insurance charge can end under the specific product.
The right comparison is the full loan structure, not just the amount of cash required for the down payment.
A low- or zero-down loan can still include mortgage insurance, a guarantee fee, a funding fee or another program-specific cost. Some charges are paid upfront, some are financed into the loan, and others are collected monthly. That means the down payment percentage alone does not tell you which option has the lower total cost.
Compare the amount financed, monthly payment, upfront cash and the rules for reducing or ending ongoing insurance charges when applicable. If a fee is financed, remember that it increases the loan balance and can generate interest over time. Use the program's current written terms and the lender's Loan Estimate for the actual transaction.
HOA dues and special assessments can change affordability
HOA dues are separate from the mortgage payment and can increase the monthly housing obligation used in both household budgeting and lender qualification.
Review current dues, recent increases and any known special assessments before relying on an affordability estimate.
A property with a lower price can still create a higher monthly cost if association charges are substantial.
HOA dues are part of the housing budget even though they are not paid to the mortgage lender as principal and interest. Lenders may also include required association dues in debt-to-income calculations. Review the current dues, what they cover and whether the association has announced special assessments that could add a separate monthly or lump-sum obligation.
A low purchase price can still produce a high total housing cost when association charges are substantial. Compare properties on the full monthly burden and ask for recent association documents when appropriate. Future dues are not guaranteed to stay level, so leave room in the budget rather than treating the current assessment as permanent.
Debt-to-income ratio and other monthly obligations
Mortgage underwriting is based on income that can be documented under the program and lender rules, not simply on the highest income number a household has received recently.
Keep pay, tax and business records organized, and tell the lender promptly about a job change, leave, bonus change, business shift or other event that may affect qualifying income.
A change that seems positive can still require new verification, so avoid making assumptions about how a lender will treat a new compensation structure until the file is reviewed.
New monthly obligations can change the debt-to-income ratio the lender used to approve the mortgage. Opening a credit card, financing a vehicle, taking a personal loan or increasing required payments may also affect credit. Keep the financial picture stable while the loan is active unless the lender has reviewed the change first.
When comparing affordability, use required monthly debt payments consistently in every scenario. If a debt will be paid off or excluded, confirm how the lender will document that treatment rather than assuming the payment can be ignored. The goal is to make the budget and the underwriting calculation reflect the same set of obligations.
Rate sensitivity: how a rate change affects mortgage payment
Interest rate is one of the strongest inputs in a mortgage payment because it changes the amount of interest charged on the outstanding balance.
Run the same loan amount at several rates instead of assuming the first quote will remain available until closing.
Changing one input at a time makes it easier to see whether affordability is being driven by the price, down payment, rate, term or another cost.
A stress test asks whether the mortgage still works when one important assumption becomes less favorable. Recalculate the payment with a higher rate, a larger insurance bill, a different tax estimate or another realistic cost change. For an ARM, also test a future adjustment scenario within the loan's contractual caps instead of relying only on the introductory payment.
Change one input at a time so you can see what is driving the result. If a modest change makes the budget unworkable, the purchase price, loan amount or cash reserve may be too tight. The purpose is not to predict exactly what will happen; it is to measure how much room the household has if the original estimate proves optimistic.
How to stress-test the numbers before you rely on them
Before relying on the numbers in Mortgage Affordability Calculator: How Much House Can You Afford?, rerun the scenario with assumptions that are slightly less favorable than the first estimate. A higher rate, a larger insurance bill, a different tax estimate or a smaller down payment can materially change the monthly payment and the cash needed at closing. The purpose of the stress test is not to predict the future; it is to see whether the plan still works when one important input moves.
Separate principal and interest from property taxes, homeowners insurance, mortgage insurance, homeowners association dues and any other recurring housing cost. Then compare the full monthly housing payment with the rest of the household budget. A payment that fits a lender calculation can still feel tight if it leaves too little room for repairs, transportation, childcare, medical costs, savings or other priorities.
For rate-sensitive decisions, compare at least two pricing structures using the same loan amount and lock period. One option may have a lower rate but higher points, while another may preserve more cash at closing. Looking at the break-even period can help show how long it would take for the upfront cost of a lower rate to be recovered through monthly savings.
Finally, keep a cash buffer outside the transaction. The strongest mortgage plan is not simply the one that produces the largest loan amount or the lowest modeled payment. It is the one that remains workable after the closing costs are paid and when normal ownership expenses begin to appear.
