The bank will approve you for more house than you should buy
DecidePlan Editorial · Published August 17, 2026
A mortgage pre-approval feels like an answer. A lender looks at your income, credit, assets, and debt, and hands you a number: you're approved to borrow up to $X. It's easy to treat that number as the budget. It isn't one — it's the maximum a lender is willing to risk lending you, calculated from debt-to-income limits, not from what would actually feel comfortable to pay every month for the next 30 years.
Lenders in 2026 generally work within two debt-to-income (DTI) bands. Conventional loans typically allow up to 36% of gross income toward housing costs (front-end DTI), with total debt often stretching to 45%, and as high as 50% for borrowers with strong credit and assets. FHA loans are similar: 31% front-end as a base guideline, with total debt allowed up to roughly 43–50%. Financial advisors, on the other hand, still widely recommend the more conservative 28/36 rule — 28% of gross income on housing, 36% on total debt — specifically because it leaves room for savings, emergencies, and everything else a household needs beyond the mortgage.
| Guideline | Housing (front-end) | Total debt (back-end) |
|---|---|---|
| Conservative / advisor-recommended | 28% | 36% |
| Conventional loan maximum | up to 36% | up to 45%, sometimes 50% |
| FHA loan base guideline | 31% | 43%, sometimes higher |
The gap between the first row and the last two is the gap between what you can afford and what you're allowed to borrow. On a household making $100,000 a year, that's the difference between roughly $2,300/month in housing costs and $3,000+/month — a swing of $700 or more every single month, for as long as you hold the mortgage.
What pre-approval doesn't account for
- Retirement savings — DTI math doesn't check whether you're still funding a 401(k) or IRA at the payment level you're approved for.
- A home's own sinking fund — a roof, HVAC system, and water heater all have known replacement costs a lender's formula ignores entirely.
- The lifestyle pressure of being "house-poor" — approved, but with little left over for anything beyond the mortgage.
Answer a few questions about your take-home pay, debt, and savings — get a Comfortable, Sweet Spot, and Stretch home-buying range, not a lender's maximum.
Use the home purchase calculatorNone of this means pre-approval is wrong to get — it's a necessary step before you can make an offer. It just means the number on that letter is a ceiling set by a formula that's optimizing for the lender's risk, not your monthly peace of mind. Treat it as the outer edge of what's possible, and use a separate, more conservative number as the one you actually shop with.