How Much House Can You Actually Afford? The 28/36 Rule, Explained With Your Numbers
Last updated: July 2026. Lenders don’t approve a mortgage based on what you’d like to spend — they use debt-to-income ratios that cap your housing payment and your total debt relative to income. Our free Home Affordability Calculator applies the same 28%/36% limits lenders typically use, so you get a realistic price ceiling before you start touring homes you can’t actually qualify for.
The two ratios lenders actually apply
Most conventional lenders apply two limits simultaneously: your total housing payment (principal, interest, taxes, insurance, HOA) generally shouldn’t exceed about 28% of gross monthly income, and your total debt payments — housing plus car loans, student loans, credit cards — generally shouldn’t exceed about 36%. Whichever ratio is more restrictive for your situation sets your actual ceiling, which is exactly how automated mortgage underwriting tends to work. Most affordability guesses skip the 36% check entirely and only think about the 28% housing number, which is why they’re often wrong for anyone carrying meaningful existing debt.
Why a $400 car payment can cost you $60,000 of home price
Because the back-end (36%) ratio caps your combined debt, every dollar of existing monthly debt directly reduces the mortgage payment — and therefore the home price — you can qualify for. On a $100,000 income, a $400/month car payment can reduce your affordable home price by tens of thousands of dollars compared to having no car payment at all, often by more than simply saving that same $400/month toward a bigger down payment would achieve. If your affordability number feels lower than expected, check which ratio the calculator flags as your binding constraint — existing debt is very often the real culprit, not the housing ratio itself.
Paying off debt vs. saving a bigger down payment
Because existing debt caps your ratio directly, paying off a car loan or credit card balance before applying for a mortgage frequently raises your max home price by more than putting that same money toward a larger down payment would. A bigger down payment lowers your loan amount, but a paid-off debt raises the entire ceiling the ratio allows — a distinction most affordability guides skip entirely. If you’re deciding between the two moves with limited cash, run both scenarios through the calculator and compare.
What this calculator doesn’t include
The 28%/36% ratios are common industry guidelines, not universal rules — actual approved DTI limits vary by lender, loan program, credit score, and compensating factors, and some borrowers qualify above 36% back-end under certain loan types. This tool also doesn’t factor in Private Mortgage Insurance (PMI), which typically applies below 20% down and would reduce your affordable price further. Use it as a starting estimate before getting pre-approved, not a guarantee of what any specific lender will offer.
Find your real number
Head to the Home Affordability Calculator and enter your income, existing debts, and down payment to see your actual price ceiling and which ratio is limiting it. Once you have a number in mind, our Rent vs. Buy Calculator can help you decide whether buying at that price actually beats renting for your expected timeline.
Disclaimer: Freedom Wealth Lab provides general financial education, not personalized advice. Please read our full Disclaimer and Affiliate Disclosure before acting on anything you read here. The 28%/36% DTI ratios reflect standard U.S. mortgage-lending convention, not one regulator’s official rule.
