How Much House Can I Afford? (And Why Lenders Tell You the Wrong Answer)

How much house can I afford is the right question to ask before shopping for a home — but most people ask it the wrong way. They ask the lender. The problem with that is lenders aren’t trying to figure out what you can comfortably live with — they’re figuring out the maximum they can lend you while staying within their risk rules. Those are two completely different numbers, and the gap between them is exactly where buyers get into trouble.

This guide walks through how to figure out a realistic home budget for your income, what the 28/36 rule actually means, why the lender’s pre-approval number isn’t the answer, and how to land on a price that fits your real life.

The Two Numbers: What You Can Borrow vs. What You Should Spend

When you get pre-approved, a lender runs your income, debts, and credit, then tells you the maximum mortgage they’re willing to offer. That number is real — they will lend you that much. But it’s calculated to their tolerance, not yours.

What you should spend is a separate calculation, and it’s the one that protects your life from the house. Here’s the test: at the price the lender approved, can you still save for retirement, handle a surprise $5,000 repair, pay your other debts comfortably, and have a normal life — including things lenders don’t see, like daycare, family obligations, or just having a life?

If yes, the lender’s number is fine. If no, you need a smaller number — and the gap is often huge. Many first-time buyers who max out their pre-approval regret it within two years.

The 28/36 Rule: Where to Actually Start

The most widely used affordability framework is the 28/36 rule, and it’s a much more honest starting point than a lender’s maximum.

It has two parts:

No more than 28% of your gross monthly income should go toward your housing payment (principal, interest, property taxes, homeowners insurance — sometimes called “PITI”). This is the front-end ratio.
No more than 36% of your gross monthly income should go toward all your monthly debt combined — including the housing payment plus car loans, student loans, credit card minimums, and anything else recurring. This is the back-end ratio.

A quick example. If you earn $7,000 a month in gross income (before taxes):

Your max housing payment under 28% is $1,960
Your max total debt payments (including housing) under 36% is $2,520
That leaves $560 per month of “room” for non-housing debts before housing has to come down

If your car payment plus minimums on other debt already eat up that $560, your real affordable housing payment is less than $1,960 — even though the rule’s first number says you could spend that much.

What Lenders Will Actually Approve (Spoiler: A Lot More)

Here’s the gap that surprises buyers. Lenders routinely approve borrowers up to 43% DTI on conventional loans, and up to 50% on FHA loans — not the 36% conservative cap.

What that means in practice: at $7,000/month gross income, a lender might approve you for up to $3,010 in total monthly debt (43%) — over $500 more per month than the 28/36 rule says is comfortable. That’s roughly $90,000+ more in home price at today’s rates.

It’s not that the lender is wrong. They’re calculating to their risk model, not your life. At 43% DTI, you’re spending close to 55–60% of your take-home pay on debt once federal taxes, state taxes, and benefits come out. That doesn’t leave much for retirement, kids, emergencies, or anything else.

The aggressive approval feels great when you’re house-shopping. It feels terrible when you’re three years in, the roof needs $8,000 of repairs, and you realize you’ve been one bad month away from disaster the whole time.

The Other Big Factor: Down Payment and Interest Rate

The 28/36 rule tells you the monthly payment you can handle. But the home price that payment translates to depends on two other levers: your down payment and the current interest rate.

Down payment. Every dollar you put down is a dollar you don’t borrow — which means lower monthly payments and less interest over time. Moving from 10% down to 20% down has a bigger effect than just the math: it eliminates PMI (which can add $100–$400/month), often gets you a lower interest rate, and reduces your total monthly cost. The combined effect can increase the home price you can comfortably afford by 15–20%.

Interest rate. This is the one you don’t control, but it has a massive impact. At today’s average 30-year fixed rate of about 6.4%, a $1,900/month principal-and-interest payment buys roughly $305,000 in mortgage. If rates dropped to 5.5% (closer to the 15-year average), that same payment would buy about $335,000. That’s $30,000 of buying power gone — or gained — based entirely on something outside your control.

Don’t try to time rates. But do understand that the home price you can afford today isn’t the same as you could’ve afforded two years ago at different rates, and you’re not “wrong” if your budget is tighter than friends who bought earlier.

You can plug your real income, debts, and down payment into our mortgage calculator to see exactly what monthly payment your numbers support — and what home price that maps to at today’s rates.

A Realistic Framework

Here’s a way to land on a home price that fits your life, not just the lender’s spreadsheet:

Step 1. Take your gross monthly income and multiply by 0.28. That’s your maximum monthly housing payment — your starting ceiling.

Step 2. Subtract your current monthly debt payments from (gross income × 0.36). That’s your housing payment ceiling under the back-end rule. Use the lower of the two numbers from steps 1 and 2 as your actual target.

Step 3. If your income is variable, you live in a high-cost-of-living area with high state taxes, or you have non-debt expenses lenders don’t see (childcare, supporting family, medical), shave another 10–20% off that number. The 28/36 rule is conservative for typical situations. Your situation might require even more caution.

Step 4. Use a mortgage calculator to back into the home price. Plug in your monthly payment ceiling, your down payment, today’s rate, your loan term (probably 30 years — see our 15 vs 30 year mortgage guide), and the calculator will solve for the home price. Add an estimate for property taxes and homeowners insurance — usually 1.5–2.5% of the home value annually — to keep it realistic.

What Most Buyers Get Wrong

A few patterns worth flagging:

They use the lender’s max as the goal. Pre-approval is a ceiling, not a target. The fact that someone will lend you $500,000 doesn’t mean a $500,000 house is a good idea for you. Most financial advisors recommend targeting 25–30% of gross income on housing, not stretching to the 36% back-end limit.

They forget the costs that aren’t the mortgage. Property taxes, homeowners insurance, HOA fees, utilities (which scale with house size), and maintenance (budget roughly 1% of home value per year) are additional to your mortgage payment. A “$2,000 mortgage” often costs $2,800+/month all-in.

They calculate with gross, forget about net. The 28/36 rule uses pre-tax income. On a $100,000 salary, you might only take home around $70,000 after federal taxes, state taxes, and benefits. Spending 28% of gross can mean spending 40% of take-home. In high-tax states, this gap is brutal — and worth correcting for by aiming lower.

They don’t stress-test the payment. Could you still afford the house if one spouse lost a job for six months? If interest rates were 1% higher when you have to renew or refinance? If property taxes went up 20%? The right house price assumes life will throw something at you, because it always does.

Key Takeaways

The amount a lender will approve is almost always more than you should actually spend — often by tens of thousands in home price.
The 28/36 rule is a solid starting point: housing under 28% of gross income, total debt under 36%.
Lenders routinely approve up to 43–50% DTI, which often means being “house poor” — strangled by housing costs.
Down payment size, interest rate, and your other debts all change your real affordability — sometimes more than your income does.
Most financial advisors recommend targeting 25–30% of gross income for housing, especially in high-tax states or with variable income.
Stress-test for job loss, rate increases, and unexpected costs before you commit.

The honest answer to “how much house can I afford” isn’t a single number — it’s the price where you can still build wealth, weather emergencies, and live a normal life. Run your real numbers (income, debts, down payment, today’s rate) through our mortgage calculator to see what monthly payment your situation actually supports — then back into the home price from there.