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Home Affordability Calculator 2025

How much house can you afford? Enter your income, debts, and down payment to get a realistic max home price using the 28/36 rule — with property tax, insurance, and PMI built in.

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How the Home Affordability Calculator Works

This calculator answers the question most buyers start with — “how much house can I afford?” — by working backward from your finances instead of forward from a price. It begins with the 28/36 rule: it takes your gross monthly income, applies the debt-to-income limit you choose, and subtracts your existing monthly debts to find the largest total housing payment you can comfortably carry.

From that housing budget it removes estimated property taxes, homeowners insurance, and PMI to isolate how much is left for principal and interest, then inverts the standard mortgage formula to convert that payment into a maximum loan amount. Adding your down payment gives your maximum home price. Because taxes and PMI depend on the price itself, the calculator iterates until the figures settle, so the result is internally consistent. Defaults reflect typical 2025 national figures, and every input is editable — change your income, debts, down payment, rate, term, or DTI target and the answer updates instantly.

Who Benefits Most From This Calculator

  • First-time buyers figuring out a realistic budget before they start touring homes or talking to lenders.
  • Anyone setting a house-hunting price range who wants a number grounded in income and debts, not guesswork.
  • Buyers weighing how much to put down and wanting to see how crossing the 20% PMI threshold changes their ceiling.
  • People paying down debt who want to see how a car loan or student loan payoff raises their buying power.
  • Cautious planners who prefer to buy below the maximum and want to model a conservative DTI.

Who Should Look Elsewhere

This tool estimates affordability for a conventional fixed-rate mortgage using standard DTI rules. If you already know the home price and just want to see the monthly payment, use the mortgage calculator instead. Borrowers using FHA, VA, or USDA loans should note those programs have their own DTI limits, mortgage-insurance structures, and qualifying rules that differ from the conventional assumptions here. Self-employed buyers or those with variable income may find lenders average or discount their income in ways this calculator can't capture, and anyone seeking a formal pre-approval should treat this as a planning estimate, not a substitute for a lender's underwriting.

Tax Implications of Affordability

Property taxes are not a side note — they're part of your monthly housing payment and therefore directly reduce how much home you can afford. In a high-tax state, the same income supports a lower price than it would where rates are low, which is why this calculator includes the property-tax rate in the affordability math rather than ignoring it. Adjust the rate to match your target area and watch your ceiling move.

Some buyers count on the mortgage interest deduction to make a home more affordable, but it helps far fewer households than people assume. It only applies if you itemize, which only pays off when your deductions exceed the 2025 standard deduction of $15,000 (single) or $30,000 (married filing jointly). Interest is deductible on up to $750,000 of mortgage debt, and property taxes fall under the $10,000 SALT cap shared with state income taxes. Do not stretch your budget on the assumption of a tax break — treat any deduction as a possible bonus and consult a tax professional for your situation.

Tips, Tricks & Hidden Costs to Watch

  • Don't max out your budget — plan to a conservative 28% DTI and treat the lower number as your real ceiling so the mortgage doesn't dominate your finances.
  • The lender's maximum is not the wise maximum — approvals ignore retirement saving, childcare, and lifestyle; just because you can borrow it doesn't mean you should.
  • Budget 2–5% for closing costs — due in cash on top of your down payment, separate from the price this calculator estimates.
  • Set aside ~1% of home value per year for maintenance — the recurring cost first-time buyers most often forget.
  • Keep your emergency fund intact — three to six months of expenses, rather than draining savings for a larger down payment.
  • Pay down debt before applying — every $100 of monthly debt eliminated can add roughly $15,000–$20,000 to your buying power.

Home Affordability Formula (2025)

How the 28/36 rule and an inverted amortization formula turn your income into a maximum home price.

Max Housing = (Annual Income ÷ 12) × DTI% − Monthly Debts

Example:

$90,000 income, 36% DTI, $500 monthly debts

(90000 ÷ 12) × 0.36 − 500
= $2,700 − $500 = $2,200 / month for housing

Variables:

Annual Income - Gross household income before tax
DTI% - Target debt-to-income limit (e.g. 36%)
Monthly Debts - Car, student loan, and credit-card payments

Max P&I = Max Housing − Tax − Insurance − PMI

Example:

$2,200 budget, ~$294 tax, $150 insurance, ~$109 PMI

2200 − 294 − 150 − 109
= ≈ $1,647 / month available for principal & interest

Variables:

Tax - Home price × tax rate ÷ 12
Insurance - Annual homeowners insurance ÷ 12
PMI - Loan × PMI rate ÷ 12 when LTV > 80%

Max Loan = P&I × [ (1+r)^n − 1 ] / [ r(1+r)^n ]; Max Price = Loan + Down Payment

Example:

$1,647 P&I at 6.5% over 30 years, $60,000 down

1647 × [(1.005417)^360 − 1] / [0.005417 × (1.005417)^360] + 60000
= ≈ $260,600 loan + $60,000 = ~$320,000 max home price

Variables:

r - Monthly interest rate (annual ÷ 12)
n - Total payments (years × 12)
Down Payment - Cash you put down up front

These formulas provide the mathematical foundation for the calculations. Actual results may vary based on rounding, compounding frequency, and specific lender policies.

How We Calculate & Keep This Accurate

We apply the 28/36 debt-to-income framework: gross monthly income times your chosen DTI limit, minus existing monthly debts, gives the maximum total housing payment. We subtract estimated property tax, homeowners insurance, and PMI (applied only when the loan-to-value ratio exceeds 80%) to isolate the principal-and-interest budget, then invert the standard amortization formula to find the maximum loan. Because tax and PMI depend on the home price, we iterate the calculation until it converges. Defaults reflect national 2025 averages and are clearly editable.

We do not model FHA/VA/USDA qualifying rules, adjustable rates, lender overlays, or income that underwriters average or discount. Results are estimates for planning and will differ from a lender's official pre-approval.

Data & Freshness

Figures reflect 2025 tax-year data.

Last updated June 8, 2026 · Maintained by the Financial Calculator editorial team.

Home Affordability Calculator — Frequently Asked Questions

Answers to the most common questions about how much house you can afford, the 28/36 rule, DTI, down payments, and credit.

How much house can I afford on my salary?

A widely used rule of thumb is that you can afford a home worth roughly three to five times your gross annual income, but the more precise answer depends on your debts, down payment, interest rate, and the property taxes and insurance where you buy. This calculator works backward from your income using the 28/36 rule: it caps your total monthly housing payment so that all your debt — including the new mortgage — stays within a target share of your gross income, then subtracts estimated taxes, insurance, and PMI to find how much is left for principal and interest. It then inverts the mortgage formula to convert that payment into a maximum loan and adds your down payment to reach a max home price. For example, on a $90,000 salary with $500 in monthly debts, a 36% DTI limit, $60,000 down, and a 6.5% rate over 30 years, you can afford roughly a $320,000 home. Change any input and the answer updates instantly, so you can see exactly how a raise, paying off a car loan, or a bigger down payment moves your number.

What is the 28/36 rule and how does it work?

The 28/36 rule is a lending guideline that keeps your housing costs sustainable. The first number, 28%, is the front-end ratio: your total monthly housing payment — principal, interest, property taxes, insurance, and PMI — should not exceed 28% of your gross monthly income. The second number, 36%, is the back-end ratio: all of your monthly debt payments combined, including the mortgage plus car loans, student loans, and minimum credit-card payments, should stay under 36% of gross income. Lenders use these ratios to judge whether you can comfortably repay a loan. This calculator lets you choose the DTI limit you want to plan against — a conservative 28%, the standard 36%, or a more aggressive 43% that some loan programs allow. Planning to the lower end leaves more breathing room in your budget for saving, emergencies, and the unexpected costs of homeownership, while the higher end stretches you toward the maximum a lender might approve. The rule is a starting point, not a guarantee; your actual approval depends on credit, the loan program, and the lender's overlays.

What's the difference between front-end and back-end DTI?

Both are debt-to-income ratios, but they measure different things. The front-end DTI (also called the housing ratio) looks only at your housing payment — principal, interest, taxes, insurance, and PMI — as a percentage of your gross monthly income. The back-end DTI (the total-debt ratio) adds in every other recurring monthly debt: auto loans, student loans, personal loans, and minimum credit-card payments. Lenders care most about the back-end number because it captures your full obligation load, but they watch both. A common conventional limit is 28% front-end and 36% back-end, though programs backed by Fannie Mae, Freddie Mac, or the FHA may allow back-end ratios up to 43–50% with strong compensating factors such as a high credit score or large cash reserves. This calculator reports both ratios at your maximum affordable price so you can see how much of your income each layer consumes. If your back-end DTI is being driven up by existing debts, paying those down before you apply can meaningfully increase the home price you qualify for.

How do student loans and car payments reduce what I can afford?

Every dollar of existing monthly debt directly subtracts from the amount you can put toward a mortgage, because lenders cap your total debt — not just housing — as a share of income. Suppose your gross income is $7,500 a month and you're planning to a 36% back-end limit; that gives you $2,700 of total debt capacity. If you carry $500 a month in car and student-loan payments, only $2,200 is left for the entire housing payment. Once taxes, insurance, and PMI are taken out, the remaining principal-and-interest budget shrinks further, and because that figure is run through the amortization formula, even a modest debt payment can cut tens of thousands of dollars off your maximum loan. As a rough guide, every $100 of monthly debt reduces your buying power by roughly $15,000–$20,000 at today's rates. This is why paying off a car loan or refinancing student debt to a lower payment before house-hunting is one of the most effective ways to qualify for more home. Try setting monthly debts to zero in the calculator to see the full effect.

Does a bigger down payment let me afford more house?

Yes, in two compounding ways. First, your down payment is added directly to the maximum loan to arrive at the maximum home price, so an extra $20,000 in cash raises your price ceiling by at least that amount. Second, and often overlooked, a larger down payment can eliminate private mortgage insurance: once you put down 20% or more, PMI disappears, freeing up that monthly cost to support a bigger principal-and-interest payment — which the amortization formula turns into a larger loan. The combined effect means crossing the 20% threshold can boost your affordability by noticeably more than the cash you added. A bigger down payment also lowers your loan-to-value ratio, which can earn you a better interest rate, further increasing how much home your payment supports. The trade-off is liquidity: draining your savings for a larger down payment can leave you without an emergency fund, which is risky for a new homeowner facing repairs and closing costs. The calculator lets you test different down-payment amounts so you can find the balance between buying power and keeping cash in reserve.

What credit score do I need to buy a house?

There's no single cutoff, because requirements vary by loan program, but credit score heavily influences both whether you qualify and the interest rate you're offered — which in turn changes how much house you can afford. Conventional loans backed by Fannie Mae and Freddie Mac generally want a score of 620 or higher, with the best pricing reserved for borrowers above 740. FHA loans are more flexible, accepting scores as low as 580 with a 3.5% down payment, or down to 500 with 10% down. VA and USDA loans don't set a strict minimum but lenders usually look for 620 or more. Because rate is a direct input to affordability, a higher score can meaningfully raise your maximum price: a borrower with a 760 score might qualify for a rate a full point lower than someone at 640, and that lower rate supports a larger loan for the same monthly payment. If you're a few months out, paying down credit-card balances, avoiding new credit, and correcting report errors can lift your score into a better tier before you lock a rate. Lower the interest rate in this calculator to see how much more home a better score could buy.

Should I borrow the maximum amount the lender approves?

Almost never. The figure a lender approves is the most they're willing to risk lending you, not the amount that leaves you financially comfortable. Lender maximums are based on gross income and the debts that show up on your credit report — they don't account for retirement saving, childcare, commuting costs, irregular income, or your personal appetite for risk. Borrowing to the ceiling can leave you 'house poor,' with little left each month for emergencies, travel, or investing, and it makes you fragile to a job loss, a rate reset, or a surprise repair. A wiser approach is to plan to a conservative DTI — try the 28% setting in this calculator — and treat the resulting, lower number as your real budget. Many financially secure homeowners deliberately buy below their maximum so that the mortgage is a comfortable part of their life rather than the thing that dictates it. Remember that taxes, insurance, and maintenance tend to rise over time, so the payment that feels manageable at the maximum today can feel tight in a few years. Leave yourself margin.

What other costs should I budget for beyond the mortgage?

The monthly payment is only part of the cost of owning a home, and the extras catch many first-time buyers off guard. At purchase, expect closing costs of 2–5% of the loan amount — lender fees, title insurance, appraisal, and prepaid escrow — due in cash on top of your down payment; on a $320,000 home that's roughly $8,000–$16,000. After you move in, budget about 1% of the home's value per year for maintenance and repairs (around $3,200 on that same home), plus utilities, which are often higher than in a rental. If you buy a condo or a home in a managed community, monthly HOA dues are an additional fixed cost, and special assessments can hit without warning. Property taxes and insurance premiums tend to rise over time, pushing your escrow payment up. And every buyer should keep an emergency fund of three to six months of expenses intact rather than spending it all on the purchase. Factoring these in is exactly why borrowing below your maximum is prudent: the affordability number this calculator produces covers the mortgage, but your true cost of ownership is higher.
US Home Affordability Calculator User Reviews

Disclaimer: Results are estimates for planning only and do not constitute tax, legal, lending, or investment advice. Actual paycheck and tax outcomes can vary based on employer settings, local rules, and personal elections. Consult a qualified US tax professional, CFP, or attorney before making financial decisions.