Ask most people to describe their bank and "generous" is not the word that comes up. Then you apply for a mortgage, and suddenly the same institution that argued with you over an overdraft fee is offering to lend you more money than you have ever seen in one place. The number on a pre-approval letter is often startling — and the most important thing to understand about it is that it is not a recommendation. It is a ceiling.

Why the approval is bigger than you expect

Lenders do not approve you for what you can comfortably afford. They approve you for the most they believe you can repay, and in 2026 that line sits a long way from the old rules of thumb. The classic budgeting guideline is 28/36: housing costs at or under 28% of gross monthly income, all debt payments combined at or under 36%. Underwriting is far looser. Fannie Mae's Desktop Underwriter will approve conventional loans with total debt-to-income ratios as high as 50%. FHA's standard guideline is 31% for housing and 43% for all debt, and automated FHA approvals can stretch to roughly 46.9% and 56.9% with compensating factors. The 28/36 rule is a budgeting guideline, not a lender limit, and lenders routinely approve well above it.

Put those ratios on a real paycheck. A household earning $120,000 a year has $10,000 a month in gross income. The 28% guideline caps its housing payment at $2,800. If that household carries no other debt, a conventional approval at 50% could allow a total payment of $5,000 a month — nearly 80% more than the guideline, all of it going to housing. And that is gross income: taxes, retirement contributions and health insurance come out before you ever see it.

Translate the payments into loan size at a rate consistent with 2026's mid-6s market, say 6.5% on a 30-year fixed, and set taxes and insurance aside for a moment. $2,800 a month of principal and interest carries a loan of roughly $443,000, which with a down payment on top puts a home near the mid-2026 median existing-home price of about $429,300 within reach. $5,000 a month carries roughly $791,000 — more than six times that household's income. Property taxes, homeowners insurance and any HOA dues shrink both loan amounts, but the distance between what a guideline suggests and what a lender will write stays enormous.

Approved is not the same as affordable

The lender's number is built from your gross income and your credit report. It knows nothing about the things that actually determine whether a payment feels light or crushing: the daycare bill, the aging car, the parent who may need help, the job that pays well this year and might not next year, the retirement account you have been meaning to fund. A 50% debt-to-income ratio leaves half of your pre-tax income for everything else, and once taxes come out, debt payments claim well over half of what actually lands in your checking account. Many households learn the difference between approved and affordable only after a few years of feeling house-poor.

Work backwards from your budget instead

  • Start with the monthly number, not the price. Decide what total housing payment you can carry through a bad year, not a good one: principal, interest, property taxes, homeowners insurance, mortgage insurance if you put less than 20% down on a conventional loan, and HOA dues. The 28% guideline is a reasonable starting point; going lower is not a failure.
  • Convert that payment into a price. Any mortgage calculator will turn a payment and a rate into a loan amount. Use a rate from this week's market, not last year's, and leave room for rates to move before you lock. Our guide to how much house you can handle walks through the full arithmetic.
  • Shop the lender, then hold the line. Rates vary widely between lenders on the same morning; on a $400,000 loan, a 1.25-point spread between lenders is worth about $325 a month. Once you have your price, ask your lender for a pre-approval letter written at your offer amount rather than your maximum; a letter showing you could pay far more invites a counteroffer. And do not let a bigger number from the bank, or an agent's nudge to "go a little higher," move a budget you set in a calm moment.

The signs you went too far

If you already own and the payment is winning every month, the symptoms are predictable: no progress on savings, balances creeping up on credit cards, a flinch every time the escrow analysis arrives. Three signs your mortgage is too expensive for your budget covers what to do about it. The better path is to never get there, and that starts with treating the lender's generosity as a limit, not an invitation.