Home Affordability Calculator

What Determines How Much House You Can Afford?

Home affordability is not the same as the loan amount a lender will approve — it is the price your income can comfortably carry every month after taxes, insurance, and existing debts. Lenders gauge this with the 28/36 rule: your monthly housing payment should stay at or below 28% of gross monthly income, and your total debt payments should stay at or below 36%. The Consumer Financial Protection Bureau stresses that the maximum a lender allows and the amount you can actually sustain are two different numbers, and the gap between them is where most budget stress begins.[1, 2]

The calculator above works backward from the mortgage payment formula. It first finds your maximum monthly housing budget — the smaller of the 28% front-end limit and the 36% back-end limit minus your existing debts — then solves for the home price whose full monthly payment (principal, interest, taxes, insurance, HOA, and PMI) exactly fills that budget. Because property tax, insurance, and PMI all scale with the price of the home, the answer is a single self-consistent figure rather than a rough rule of thumb.[2]

As of mid-2026 the market backdrop sets the terms. Freddie Mac's Primary Mortgage Market Survey puts the 30-year fixed rate near 6.5%, while the National Association of Realtors reports a median existing-home price of about $429,300 — together these define how far a given income now stretches. The calculator defaults to a slightly conservative 7% rate, so dropping it to today's quoted rate is one of the first adjustments worth making before you trust the maximum price it returns.[6, 26]

Front-End vs. Back-End: The Two Ratios That Cap Your Price

The front-end ratio measures only your housing payment against gross income; the conventional guideline caps it at 28%. The back-end ratio (also called the debt-to-income or DTI ratio) adds every recurring debt — car loans, student loans, minimum credit-card payments, child support — and caps the total at 36%. The CFPB explains that lenders weigh the back-end ratio most heavily because it reflects your whole obligation load, not just the mortgage.[2]

Whichever ratio runs out of room first becomes the binding constraint on your price. A borrower with no other debts is usually capped by the 28% front-end limit, while a borrower carrying a car loan and student loans often hits the 36% back-end wall first. The calculator labels which constraint is binding so you can see exactly what to attack: someone limited by the back end can raise their affordable price simply by paying down a card or car loan, with no change in income.[2]

It helps to know where these numbers come from. The 28/36 split is an industry guideline, not a statute. The binding legal standard is the CFPB's Ability-to-Repay rule, which requires a lender to verify you can actually afford the loan. For years a 43% back-end DTI served as the practical ceiling, but the 2021 General Qualified Mortgage rule removed that hard 43% cap and replaced it with a price-based test tied to the loan's rate. Lenders must still weigh your DTI or residual income, so 43% remains a useful sanity check — just no longer an absolute line.[11, 13]

What Income Actually Counts Toward Your Limit

Affordability starts with income, but lenders count it more narrowly than you might expect. They use gross (pre-tax) qualifying income, and they care about two things above all: stability and continuity. As a rule of thumb drawn from the Fannie Mae Selling Guide, income should have a two-year history and a reasonable expectation of continuing for at least three more years. A raise you received last month helps; a job you start next week with no track record usually does not.[22, 2]

How each type of pay is treated varies. Base salary is counted in full. Overtime, bonus, and commission income generally need a two-year average to count, and if they are trending down the lender uses the lower, more recent figure. Self-employed borrowers are typically qualified on the average of two years of net profit from their tax returns — not gross receipts — which is why a strong year can be diluted by a weaker one. Rental, investment, Social Security, pension, and child-support income can all count when properly documented. Because the calculator works from whatever income you enter, the accuracy of your result depends entirely on entering the figure a lender would actually use, not your gross pay before these adjustments.[1, 2]

PITI: The Four Parts of Your Real Monthly Payment

Affordability is measured against the full housing payment, not just principal and interest. Lenders call this PITI: Principal, Interest, Taxes, and Insurance — and most add HOA dues and, when applicable, PMI. The principal-and-interest portion follows the standard amortization formula, while taxes and insurance are usually collected monthly into an escrow account and paid on your behalf when due.[3]

This matters for affordability because taxes and insurance can add hundreds of dollars to a payment that a "principal and interest only" estimate would miss entirely. On a $400,000 home, a 1.1% property tax adds about $367 per month and insurance another $100–$150 before a single dollar of HOA or PMI. The calculator accounts for all of these as a share of the home price, which is why a higher tax or insurance rate directly lowers the price you can afford.[1]

The principal-and-interest core of the payment follows a fixed amortization schedule: early payments are mostly interest, and the balance shifts toward principal over the years. To see how the pieces add up, take the calculator's defaults — a $90,000 income, $500 in other debts, and $60,000 down at 7% over 30 years. The 28% front-end limit caps housing at $2,100 a month, and the engine finds the price whose full payment fills exactly that: about $305,000, split into roughly $1,630 of principal and interest, $280 of property tax, $90 of insurance, and $100 of PMI. Change any single input and every piece re-solves at once.[15]

Down Payment and PMI: Why 20% Is the Magic Number

Your down payment does double duty: it reduces the loan you need and determines whether you pay private mortgage insurance. When the down payment is under 20% of the price (a loan-to-value above 80%), conventional lenders require PMI — typically 0.5% to 1% of the loan per year, and higher for weaker credit — which protects the lender, not you. Crossing the 20% threshold removes that cost entirely, which is why the calculator treats 20% down as a distinct boundary.[4]

PMI is not permanent. Under the federal Homeowners Protection Act of 1998, a servicer must automatically terminate PMI once the loan balance reaches 78% of the original value, and you can request cancellation at 80%. Still, while it is active, PMI eats into the same 28% housing budget that limits your price — so a smaller down payment can lower your maximum affordable home in two ways at once: a bigger loan and an added monthly premium.[5]

How much do buyers actually put down? Despite the cultural weight of the 20% figure, most people put down far less. The NAR 2025 Profile of Home Buyers and Sellers found a median down payment of 10% for first-time buyers and 19% for all buyers, with repeat buyers — who roll equity from a sale into the next purchase — putting down a median of 23%. A smaller down payment is normal and often sensible; just remember it raises both the loan and the monthly PMI, so the price your income supports lands below the 20%-down scenario the calculator shows by default.[27]

Property Tax and Insurance: The Local Wildcards

Two homes at the same price in different states can demand very different incomes, because property tax and insurance vary widely by location. Effective property-tax rates range from well under 0.5% of value in some states to over 2% in others, and homeowners insurance has climbed sharply in regions exposed to wildfire, hurricane, and flood risk. Since both are charged as a share of the home value, a high-tax or high-insurance area mechanically shrinks the price your fixed monthly budget can support.[1]

When you estimate affordability, use a tax and insurance rate for the specific county and property type you are targeting rather than a national average. Local assessor websites publish effective rates, and an insurance agent can quote a realistic premium for the home and its hazard exposure. Plugging accurate local numbers into the calculator can swing the maximum price by tens of thousands of dollars.[3]

The spread is wider than most buyers realize. Tax Foundation data put the highest effective property-tax rates in New Jersey and Illinois at about 1.88% of value, while Hawaii (0.29%) and Alabama (0.37%) sit at the bottom — a gap that can swing the income required for the same house by thousands of dollars a year. Insurance has become the other moving part: the Insurance Information Institute reports a national average premium near $1,569 in the latest NAIC data, but market surveys now put typical annual premiums closer to $2,500–$3,000 as costs climb in catastrophe-exposed regions. The calculator's default of 0.35% of value (about $1,400 on a $400,000 home) is a reasonable national midpoint — in a high-tax or high-hazard market, raise both rates.[30, 31]

How Interest Rates and Loan Term Move Your Limit

Interest rate is the single most powerful lever on affordability. Because your monthly budget is fixed, a higher rate buys a smaller loan: roughly speaking, every one-percentage-point rise in the 30-year rate cuts buying power by about 10%. The Freddie Mac Primary Mortgage Market Survey publishes the weekly average rate, and the Federal Reserve H.15 release shows how mortgage rates track the 10-year Treasury yield, so you can sanity-check the rate you enter against current market conditions.[6, 7]

Loan term works the other way. A 15-year mortgage carries a lower rate but a much higher monthly payment, so it shrinks the price your budget supports compared with a 30-year loan — even though it saves enormously on lifetime interest. The 30-year term remains the affordability default precisely because it spreads principal over the most months. Use the CFPB Explore Rates tool to see the rate range lenders are actually offering for your credit profile and term.[8]

Concrete numbers anchor the point. For the week ending June 25, 2026, Freddie Mac's survey put the 30-year fixed at 6.49% and the 15-year at 5.84%. You can track the same series over time on FRED for the 30-year and the 15-year average. Because the calculator defaults to 7%, entering the current 6.49% typically lifts the affordable price by several percent — a useful reminder that a stale rate assumption quietly understates your range.[24, 25]

Your credit score moves the rate, and the rate moves your price. Lenders price mortgages in tiers, so the gap between a top-tier and a subprime score can exceed a full percentage point — which, by the 10%-per-point rule above, is a double-digit swing in buying power on identical income. The CFPB explains how your credit score affects what you can afford, and it is often the highest-return project before you shop: lifting a score from the high-600s into the 740-plus range can pay off more than scraping together a slightly larger down payment.[14]

Loan Programs: Conforming, FHA, VA, and the QM Rule

The 28/36 rule is a guideline, not a hard ceiling — the actual limit depends on the loan program. Conventional loans backed by Fannie Mae and Freddie Mac can approve back-end ratios well above 36% with strong compensating factors, but only up to the conforming loan limit the FHFA sets each year — $832,750 for a one-unit home in 2026, rising to $1,249,125 in high-cost areas. Above that you enter jumbo territory with stricter underwriting. FHA loans allow higher ratios with a smaller down payment and a 2026 floor of $541,287, while VA loans for eligible veterans can require no down payment at all, in exchange for a one-time funding fee starting at 2.15%.[9, 18, 10, 19]

There is also a regulatory backstop. Under the CFPB's Ability-to-Repay / Qualified Mortgage rule, lenders must verify that you can repay the loan. As covered earlier, the once-rigid 43% DTI ceiling has given way to a price-based standard, though the underwriting principle endures. The takeaway: the calculator's 28/36 default is deliberately conservative. If you want to see the absolute maximum a program might allow, raise the back-end limit — but remember that borrowing to the legal maximum is rarely the same as borrowing to a comfortable one.[11]

Low-Down-Payment Programs That Expand Your Reach

The 20% down payment is a target, not a requirement, and several federal programs are built for buyers who cannot reach it. FHA loans require as little as 3.5% down with a credit score of 580 or higher (10% from 500 to 579), which makes them a mainstay for first-time and credit-rebuilding buyers. VA loans for eligible service members and veterans, and USDA loans for qualifying rural and suburban buyers, can both finance 100% of the price with no down payment at all.[18, 10, 20]

Conventional lenders compete with their own low-down options. Fannie Mae HomeReady and Freddie Mac Home Possible allow as little as 3% down for income-eligible borrowers, with cancellable PMI once you reach 20% equity. The trade-off is real: every low-down path adds an insurance or guarantee cost — FHA mortgage insurance, the VA funding fee, or PMI — that consumes part of the same 28% housing budget. Used deliberately, though, these programs let a buyer enter the market years earlier than a 20%-down timeline would allow.[21, 23]

The Cash You Need Beyond the Down Payment

Affordability is not only about the monthly payment — it is also about the cash you need at the table. Closing costs typically run 2% to 5% of the loan amount and cover lender fees, title insurance, appraisal, and prepaid taxes and insurance. On a $300,000 loan that is roughly $6,000 to $15,000 due at closing, on top of the down payment. Your Loan Estimate itemizes these three business days after you apply, so you can compare offers before committing.[17, 16]

Smart buyers also keep cash in reserve. Lenders often want to see two or more months of payments in the bank after closing, and once you own the home, budgeting roughly 1% of its value a year for maintenance keeps a surprise repair from becoming a crisis. If the property carries homeowners-association dues, those are a permanent line item: the U.S. Census Bureau reports a median HOA fee of about $135 a month, and because the calculator counts HOA dues inside your 28% housing budget, a high-fee condo lowers the price you can afford just as surely as a higher interest rate.[29]

Why the Same Income Buys Very Different Homes

Where you buy reshapes what your income can afford. The National Association of Realtors reported a median existing-home price of about $429,300 in mid-2026, while the Census Bureau and HUD put the median new-home price near $424,900 — but those national figures hide enormous regional spread, from metros where the median is half the national number to coastal markets where it is double or more. The same $90,000 income that comfortably buys a typical home in a low-cost metro may not clear the entry price in an expensive one.[26, 28]

This is also where loan limits start to bite. In most of the country the 2026 conforming ceiling of $832,750 comfortably covers the median home, but in high-cost metros — where the limit rises to $1,249,125 — even well-qualified buyers can find themselves needing a jumbo loan with stricter terms. When you run the calculator, set the property tax, insurance, and HOA inputs to your actual target market rather than a national average; in real estate, location is not just a price factor, it is the price factor.[9]

Common Mistakes and How to Stretch Your Budget Safely

The biggest mistake is anchoring to the pre-approval amount instead of a comfortable payment. A pre-approval reflects the lender's risk tolerance, not your life — it ignores retirement saving, childcare, commuting, and the maintenance every homeowner eventually faces. A second common error is forgetting that affordability is built on PITI, not principal and interest, so buyers who budget for the "P&I only" figure are blindsided by escrow at closing.[1]

The safe levers are within your control. Paying down a car loan or credit card frees back-end room immediately; saving to the 20% down threshold removes PMI and lowers the loan; and improving your credit score can shave the interest rate, which directly lifts the price you can afford. Run the numbers for several scenarios before you shop, and compare loan options so the home you fall in love with is one you can still afford in a bad month, not just a good one.[12]