How this calculator decides your budget
Lenders don't start from home prices — they start from your monthly capacity. This tool does the same, in three steps:
- Find your payment ceiling. Housing is capped at 28% of gross monthly income (front-end), and housing plus all other debt at 36% (back-end). Whichever produces the smaller housing payment wins.
- Subtract the non-loan costs. Property taxes and insurance live inside your monthly payment (PITI), so they're carved out before any principal and interest.
- Work backwards to a price. The remaining principal-and-interest capacity is converted into a maximum loan using the standard amortization formula, and your down payment is added on top.
Because property tax scales with the home's value, the calculator solves for the price where everything balances — a detail many simple calculators skip, which is why their numbers run high.
Why rates move your budget more than prices do
On a $90,000 income with modest debts, watch what the interest rate alone does to the maximum price (20% down, same tax and insurance):
| Mortgage rate | Approx. max home price |
|---|---|
| 5.0% | ~$390,000 |
| 6.5% | ~$345,000 |
| 8.0% | ~$305,000 |
A 3-point rate swing changes buying power by roughly 25%. This is why "waiting for prices to drop" can backfire if rates rise in the meantime — and why a rate buydown or a larger down payment is sometimes worth more than a price negotiation.
The costs that aren't in your mortgage payment
Budgeting to the PITI number alone is the classic first-time buyer mistake. Plan for:
- Maintenance and repairs: 1–2% of the home's value per year, lumpy and unavoidable (roofs and water heaters don't care about your budget).
- Closing costs: typically 2–5% of the purchase price, on top of the down payment.
- PMI if you put down less than 20% on a conventional loan.
- HOA dues where applicable — lenders count these in your DTI, and so should you.
- Utilities and insurance surprises: bigger homes cost more to heat, cool, and insure, especially in weather-risk states.
Before house-hunting, confirm your debt-to-income ratio is where lenders want it, and keep an emergency fund intact after closing — the down payment shouldn't be your last dollar.
Getting from "afford" to "approved"
This calculator estimates capacity; a lender adds credit score, employment history, and reserves. To present the strongest file: avoid new debt for six months before applying (a car loan can cut your budget by $40,000+ — test it above), keep credit utilization low, and get pre-approvals from two or three lenders within a 45-day window so the credit inquiries count as one. Once you have a target price, see what extra payments would do to the loan long-term.