How Much House Can I Afford? The Real Math Lenders Use in 2026

The simple version of this question — "how much house can I afford?" — has two completely different answers, and the gap between them is where most homebuyers get themselves into trouble.

The first answer is how much a lender will let you borrow. As of May 2026, with the Freddie Mac Primary Mortgage Market Survey reporting an average 30-year fixed rate of 6.36%,^[1] a household earning the U.S. median income of $83,730^[2] with average debts can get pre-approved for a mortgage of roughly $290,000 to $340,000. The second answer — how much house you can actually afford without your life becoming a budgeting hostage situation — is usually 25%–35% less than that.

This guide is the long version, with the formulas, the 2026 numbers, the underwriting reality, and the worked examples. By the end, you will be able to derive your own answer in about ten minutes, plug it into the mortgage payment calculator, and stop trusting a generic slider that has no idea what your property taxes are.

The 28/36 rule (and why it is only the starting point)

The classic affordability heuristic is the 28/36 rule: your monthly housing payment should be no more than 28% of your gross monthly income, and your total monthly debt service — housing plus all other obligations — should be no more than 36% of gross monthly income. These two percentages have names lenders use every day:

• Front-end ratio (28%) — housing payment ÷ gross monthly income. "Housing payment" here means full PITI, not just principal and interest.
• Back-end ratio (36%) — (housing payment + all other monthly debt minimums) ÷ gross monthly income. Other debt includes car loans, student loans, minimum credit card payments, child support, and alimony.

Applied honestly, the 28/36 rule is conservative. A household with $7,000 in gross monthly income should keep housing under $1,960/month and total debt service under $2,520/month. That math protects the family's ability to save for retirement, replace a furnace without panic, and absorb a layoff.

The problem is that nobody — neither buyers nor lenders — actually uses 28/36 as the binding constraint in 2026.

What lenders really approve: the back-end DTI in 2026

For more than a decade after the 2008 crisis, the Consumer Financial Protection Bureau capped "Qualified Mortgage" loans at a 43% back-end debt-to-income ratio. In 2021 the CFPB replaced that hard 43% cap with a price-based Qualified Mortgage threshold, allowing lenders to underwrite at higher DTIs as long as the loan's annual percentage rate stays within a defined spread of the average prime offer rate.^[3] The headline 43% number stuck in the public conversation, but the real ceilings are now higher and vary by loan program:

Caps are typical maxima. Actual approval depends on credit score, reserves, employment history, loan-to-value, and AUS findings.

The gap between the 36% rule and a 50% lender approval matters a lot. On the same $7,000 gross monthly income, a 36% back-end ratio allows $2,520 in total debt; a 50% ratio allows $3,500. That $980/month difference, at today's 6.36% rate, finances roughly $156,000 more house. It also leaves the household with $980 less per month to save, invest, repair, and breathe.

What goes into the monthly payment (the half most people forget)

The home payment your lender escrows for you has four core components, plus two common add-ons. The industry shorthand is PITI:

• P&I — Principal & Interest. The loan repayment, calculated from the amortization formula M = P · [r(1+r)n] / [(1+r)n−1] where P is loan amount, r is the monthly rate, and n is the number of monthly payments.
• T — Property taxes. Typically billed annually or semi-annually but escrowed monthly. The U.S. national average effective property-tax rate is about 1.01% of home value;^[5] state averages range from 0.27% in Hawaii to 2.42% in New Jersey.
• I — Homeowners insurance. The U.S. average annual premium is about $3,057 in 2026, up ~4% from 2025, with Florida averaging close to $8,500.^[6]
• PMI / MIP — Mortgage insurance. Required on conventional loans with less than 20% down (PMI) and on all FHA loans (MIP). FHA's 2026 annual MIP is 0.55% for most borrowers, plus a 1.75% upfront premium.^[7]
• HOA — Homeowners association dues. Common in condos and planned communities; ranges from $25/month to several hundred. Often forgotten in pre-approval math.

On a typical conventional purchase, P&I is around 75% of PITI; taxes are 10%–18%; insurance is 6%–10%; PMI is 4%–8% if applicable. Generic online affordability tools that show only P&I understate your real payment by 20%–30%.

The 2026 numbers, plugged in

Here is the affordability snapshot as of mid-May 2026, drawn directly from primary sources:

Run these through the math and the picture is sobering. A buyer making the U.S. median household income of $83,730 — about $6,978 per month gross — has a 28% front-end ceiling of $1,954 and a 36% back-end ceiling of $2,512. At the May 2026 30-year rate of 6.36%, putting 10% down on a median-priced home produces a PITI of approximately $3,108 (we work through this below). The payment exceeds the conservative ceiling by more than $1,100 per month.

This is the affordability gap the National Association of Realtors and academic researchers have been writing about since 2022, and the structural reason median-income buyers feel locked out of the median home: at today's rates and prices, the median household needs a roughly 60% gross-income lift, or a far larger down payment, to afford the median listing on the 28% rule.

A fully worked example: the median home

Let's walk through every line of the median-home purchase so the numbers are not abstract.

Assumptions. Purchase price $417,700 (NAR April 2026 median). 10% down ($41,770). Loan amount $375,930 financed at 6.36% over 30 years. Property tax 1.01% national average. Homeowners insurance $3,057/year national average. Conventional loan; PMI required at 0.50% annual until the loan-to-value ratio reaches 80%.

Income required, by rule.

A household making the 2024 median income of $83,730 is right at the edge of a 45%-DTI approval on the median home — assuming zero car payments, student loans, or credit card minimums. Add a $400 car loan and a $250 student-loan payment and the same household needs $98,000 in gross income to clear the 45% DTI.

This is why the question "how much house can I afford?" cannot be answered without knowing your other monthly debts. The debt-to-income calculator handles that arithmetic in one step.

The down payment question (and the four ways to put less down)

The advice to "put 20% down" is not a rule. It is the level at which conventional lenders stop requiring PMI. Putting less down is allowed; it just changes the program you use and adds insurance cost.

The math case for waiting until you have 20% down is weaker than personal-finance internet often claims. Saving an extra $40,000 on the median home takes the median saver around three years. Over those three years, U.S. home prices have appreciated for 34 consecutive months on a year-over-year basis,^[8] potentially eating most of the savings advantage. PMI is annoying but it is also temporary — on a conventional loan it cancels automatically at 78% LTV.

Three buyer case studies

Case 1 — Entry-level FHA buyer

Maya, 27, earns $62,000 (gross monthly $5,167). She has $200/month in student loans and no other debt. She has saved $14,000 for a down payment and closing costs. She wants to buy a $275,000 condo.

• FHA loan, 3.5% down: down payment $9,625, leaves $4,375 for closing.
• Loan amount: $265,375. Add 1.75% upfront MIP financed → $270,019.
• 30-year rate ~6.50% (FHA tends ~0.10–0.15 below conventional): P&I $1,707/month.
• Property tax (assume 1.01%): $231/mo. Insurance: $130/mo (lower for condo). HOA: $250/mo. Annual MIP 0.55%: $124/mo.
• Total PITI + HOA: $2,442/month. Plus $200 student loan = $2,642 total debt service.
• Back-end DTI: $2,642 ÷ $5,167 = 51.1%. Within FHA's compensating-factor ceiling.
• Maya is approved but is at her budget limit. A single $300 car payment would put her over. The honest read: she can buy, but she should not buy this much condo.

Case 2 — Median-income conventional buyer

The Chens, dual-income household, earn $115,000 (gross monthly $9,583). They have a $475 car payment and $150 in credit-card minimums ($625 in other debt). They have $55,000 saved.

• Target home: $375,000. 10% down: $37,500. Closing-cost reserve: $11,000. Cash buffer: $6,500.
• Loan amount: $337,500 at 6.36% → P&I $2,104/month.
• Property tax 1.01%: $316/mo. Insurance: $230/mo. PMI 0.5%: $141/mo.
• Total PITI: $2,791/month. + $625 other debt = $3,416.
• Front-end ratio: 29.1%. Back-end ratio: 35.7%. Right at the classic 28/36 line. Comfortably approvable with cash buffer intact.

Case 3 — High-income jumbo buyer

Daniel earns $310,000 (gross monthly $25,833). He has no consumer debt. He has $250,000 in liquid assets and wants to buy in a high-cost market.

• Target home: $1,150,000. 20% down: $230,000. Reserves: $20,000 (lender requires 6 months PITI).
• Loan amount: $920,000 — above the $832,750 baseline conforming limit but inside the $1,249,125 high-cost ceiling.^[4] Whether this is conforming or jumbo depends on the county.
• If jumbo, rate often ~6.45%: P&I $5,773/month. If high-cost conforming at 6.36%: P&I $5,720/month.
• Property tax 1.01%: $968/mo. Insurance: $400/mo. No PMI at 20% down.
• Total PITI: ~$7,141/month. Back-end DTI: 27.6% — well inside conservative limits.
• Daniel's binding constraint is reserves, not income. Lenders want to see 6–12 months of PITI in liquid assets after closing for jumbo loans — about $43,000 to $86,000 left after his down payment.

The hidden costs that wreck affordability post-purchase

PITI is your monthly payment to the bank. It is not the cost of owning a home.

The widely-cited Bureau of Labor Statistics Consumer Expenditure Survey estimates that homeowners spend about 1%–4% of the home's value each year on maintenance and repairs. On a $400,000 home, that's $4,000–$16,000 a year, or roughly $333–$1,333/month, on top of PITI. Items in that bucket: HVAC repairs and eventual replacement (15–25 year life, $5,000–$15,000), roof ($7,500–$25,000 every 20–30 years), water heater ($1,500–$3,500 every 8–12 years), appliance replacement, paint, landscaping, pest control, and routine plumbing/electrical fixes.

There are also one-time closing costs at purchase (2%–5% of the purchase price) and one-time moving and furnishing costs that surprise first-time buyers ($5,000–$20,000 is common). And the property tax and insurance lines escalate. The 4% annual U.S. average homeowners-insurance rate increase^[6] means a payment that is affordable in year 1 may be 20% larger in real terms by year 5 — and the escrow shortfall lands on you in one bill.

What today's rate environment means for your offer price

From late 2021 (sub-3% rates) to late 2023 (~7.5% peak), the affordability landscape inverted. The Freddie Mac PMMS held above 6% throughout 2024 and 2025 and stands at 6.36% as of May 2026.^[1] The FOMC has held the federal funds rate at 3.50%–3.75% through three consecutive meetings (March, April, and the projection materials from March 2026 imply patience through Q3).^[9]

The implication for buyers: do not buy assuming rates fall back to 3%. They are unlikely to, on any reasonable forecast horizon. But also do not skip a sensible purchase waiting for a rate that the market is not telegraphing. If rates fall, you refinance. If they rise, you locked in the cheapest payment you would have seen all decade. Run the breakeven on closing costs: a $400,000 loan refinanced from 6.36% to 5.36% saves roughly $250/month. Typical 2%–4% closing costs ($8,000–$16,000) break even in 32–64 months. Use the refinance calculator when you next see the rate drop you need.

An eight-step action checklist for the next 60 days

1. Pull a free copy of your credit report from annualcreditreport.com (free under federal law) and confirm your three FICO scores. A score above 740 unlocks the best conventional rates; 700–740 still qualifies; below 680, expect rate adjustments.
2. List every monthly debt minimum. Car loans, student loans, credit-card minimums, child support, alimony. Sum them. This is your numerator-other-debt for the DTI math.
3. Calculate your back-end DTI at three target home prices. Use 28/36 for the conservative target, 43% for the moderate target, and 45%–50% for the lender-max read. The debt-to-income calculator does this in two inputs.
4. Get a tax-and-insurance quote for the specific address you're targeting. National averages are useless; New Jersey at 2.42% looks very different from Hawaii at 0.27%, and Florida insurance can be 3× the national average.
5. Decide on the down payment program that matches your cash, credit, and timeline. 20% conventional, 10% conventional with PMI, 5% conventional, 3% conventional 97% LTV, 3.5% FHA, 0% VA/USDA. The right choice is rarely the one with the largest down payment.
6. Get pre-approved with at least three lenders within a 14-day window so credit-score impact is treated as one inquiry under FICO rules. Compare APR (not just rate), origination fees, and lender credits side by side.
7. Build a 3–6 month emergency fund before you close, not after. The most expensive mortgage emergencies happen to households who used 100% of their liquid cash on the down payment.
8. Set your honest target price 15–25% below the pre-approval ceiling. That gap is where retirement contributions, replacement of the HVAC in year seven, and a kid's braces live. Run the mortgage calculator on the honest number, not the maximum.

Frequently asked questions