Published June 11, 2026 · MortgageLoan.net Editorial
Before you fall in love with a listing, it pays to answer one question honestly: how much house can you actually afford? The number a lender will approve you for and the number that keeps your budget comfortable are often two different things. This guide walks through the rules lenders use, the costs buyers routinely underestimate, and how to land on a price that fits your real life — not just your maximum.
Most lenders evaluate affordability using two debt-to-income (DTI) ratios, summarized as the 28/36 rule:
On a $7,000/month gross income, the 28% guideline puts your target housing payment around $1,960, and the 36% guideline caps total debt near $2,520. Some loan programs stretch these limits — FHA loans can allow back-end ratios above 43%, and strong credit or reserves can push approvals higher — but a payment that fits the classic rule is far less likely to leave you house-poor.
Your down payment affects not just the loan size but your monthly cost in two ways. A larger down payment means borrowing less, and crossing the 20% threshold lets you avoid private mortgage insurance (PMI), which typically runs 0.3%–1.5% of the loan amount per year.
That said, you do not need 20% to buy. Conventional loans go as low as 3% down, FHA loans require 3.5%, and VA and USDA loans can require nothing down for those who qualify. The trade-off is a higher monthly payment and, in most cases, mortgage insurance until you build enough equity. Putting less down to keep cash in reserve is often the smarter move for first-time buyers — just budget for the added insurance cost.
The principal-and-interest figure a calculator spits out is only part of the monthly picture. Build a realistic budget around the full cost of ownership:
A home that looks affordable on principal and interest alone can become a stretch once taxes, insurance, and upkeep are stacked on top. Run the full number before you commit.
Your interest rate has an outsized effect on what you can afford. Even a half-point difference in rate can change your monthly payment by well over a hundred dollars on a typical loan — and tens of thousands over the life of the mortgage. A stronger credit score generally earns a lower rate, which in turn raises the price you can comfortably carry. If your score is on the bubble, a few months spent paying down balances and avoiding new credit can meaningfully expand your budget.
A mortgage preapproval gives you a lender-verified price range based on your actual income, debts, and credit — not a guess. It also signals to sellers that you are a serious, qualified buyer, which matters in competitive markets. Preapproval is the difference between knowing your number and hoping for it.
Affordability is about more than the largest loan you can qualify for. Use the 28/36 rule as a starting point, factor in your down payment and the full cost of ownership, and leave yourself breathing room for savings, emergencies, and the life you want to live in the home. The right price is the one that still feels comfortable when the property tax bill arrives.
Disclaimer: This article is for informational purposes only and does not constitute financial or lending advice.
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Affordability is mostly a rate calculation. A one-point move changes what you qualify for by tens of thousands, so run your budget against today’s real rate instead of a placeholder.
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