How Much House Can I Really Afford? A No-Nonsense Guide

Updated on April 28, 2026

Let me tell you what happened to my cousin Marco. He walked into a bank pre-approval meeting earning $72,000 a year, and they handed him a letter saying he could borrow up to $420,000. He was thrilled. He started touring homes in that range immediately.

Six months after closing, he was eating rice and beans four nights a week, skipping dentist appointments, and slowly drowning in a house he technically "owned." The bank wasn't lying to him. They just weren't answering the question he actually needed answered.

The question isn't how much will a lender give you. The question is how much house can you actually live in without it ruining your life. Those are two very different numbers, and the gap between them is where financial stress lives.

Start With Your Gross Income — Then Reality-Check It

Mortgage math almost always starts with gross income — what you earn before taxes, health insurance, retirement contributions, and everything else gets yanked out. Banks love gross income because it's the biggest number.

Here's the thing though: you don't spend gross income. You spend what lands in your checking account. So before you run any affordability calculation, write down your actual monthly take-home pay. If you're a W-2 employee in a typical bracket, you're probably keeping somewhere between 68–75% of your gross. If you're self-employed, that number can drop further once quarterly estimated taxes are factored in.

Got the real number? Good. Now we have something to work with.

The 28/36 Rule (And Why It's a Starting Point, Not a Finish Line)

This rule has been around for decades and most financial advisors still reference it because it's genuinely useful as a framework — not because it's perfect.

Here's how it works:

  • The 28 part: Your total housing payment — mortgage principal, interest, property taxes, and homeowner's insurance (called PITI) — should not exceed 28% of your gross monthly income.
  • The 36 part: All your debt payments combined — that housing payment plus car loans, student loans, credit cards, any other monthly obligations — shouldn't exceed 36% of gross monthly income.

So if you earn $6,000/month gross, the 28/36 rule says your housing payment tops out around $1,680, and your total debt load tops out at $2,160.

Now use a mortgage calculator and work backward from that $1,680 figure. At today's interest rates (let's say 6.8% for a 30-year fixed), $1,680 in principal and interest supports a loan of roughly $263,000. Factor in a 10% down payment and you're looking at homes around $292,000 — not $420,000.

That's already a very different conversation than what a lender might pre-approve you for. But we're not done yet, because the 28/36 rule still ignores some things that will absolutely affect your daily life.

The Hidden Costs That Blow Up "Affordable" Budgets

This is where most affordability articles get vague. Let's be specific instead.

Property Taxes

These vary wildly by location — from under 0.5% of assessed value in Hawaii to over 2% in Illinois, New Jersey, or parts of Texas. On a $300,000 home in a high-tax county, you could be paying $6,000+ per year in property taxes alone, which is $500/month added to your payment before you've paid a dollar toward the mortgage itself. Always look up the specific tax rate for the county you're buying in. Don't estimate — look it up.

Homeowner's Insurance

Budget at minimum $150–$250/month for a typical home. In hurricane zones, fire-risk areas of California, or tornado-prone parts of the Midwest, that number can double or triple. If you're near a flood plain and need separate flood insurance, add another $100–$300/month.

HOA Fees

A lot of buyers forget to ask about these until they're under contract. HOA fees range from $50/month for basic common area maintenance to $800+/month in some condo buildings or gated communities. This money is gone every month whether the market goes up or down. Include it in your housing payment calculation from day one.

PMI — Private Mortgage Insurance

If your down payment is less than 20%, expect to pay PMI. It typically runs 0.5–1.5% of the loan amount annually. On a $280,000 loan, that's $1,400–$4,200 per year, or roughly $117–$350 per month, added to your payment until you've built enough equity to cancel it.

Maintenance and Repairs

The standard rule of thumb is 1% of your home's value per year. On a $300,000 home, that's $3,000 annually or $250/month. This isn't being pessimistic — it's being accurate. HVAC systems fail, roofs age, water heaters give out, gutters need cleaning, driveways crack. These aren't surprises; they're scheduled inevitabilities. The only question is whether you've saved for them.

Utilities

Your apartment utility bill is not your future house utility bill. A 1,000 sq ft apartment might cost $80–$120/month to heat and cool. A 2,400 sq ft house in the same city? Easily $200–$350/month. Add water, trash, and internet and you could be looking at $400–$600/month in utilities that you weren't paying before.

Running the Real Numbers: A Worked Example

Let's say you and your partner bring home a combined gross income of $95,000/year, or about $7,917/month gross. Your actual take-home after taxes and benefits is closer to $5,800/month.

You have the following existing debts: a car payment of $340/month and student loan minimum payments of $210/month. Total existing debt: $550/month.

Using 28/36 on gross:
Max housing payment (28%): $2,217
Max total debt (36%): $2,850
Max housing payment after existing debt: $2,850 − $550 = $2,300
Governing limit: $2,217 (the lower of the two)

But now let's account for what's actually inside that $2,217 on a $300,000 home purchase with 10% down:

  • Principal + interest (6.8%, 30yr, $270k loan): ~$1,762
  • Property taxes (1.2% rate): $300/month
  • Homeowner's insurance: $175/month
  • PMI (0.8%): $180/month

Total PITI + PMI: $2,417/month. That's already over the 28% limit — and we haven't even touched maintenance, utilities, or HOA.

The honest number here is probably a $240,000–$260,000 home, with a larger down payment to kill the PMI faster, or a plan to wait and save more before buying.

That might feel disappointing. But it's the truth, and the truth now is a lot less painful than the truth two years into financial stress.

The Debt-to-Income Ratio Lenders Actually Use

Lenders calculate two DTI ratios. The front-end ratio is just your housing costs divided by gross income. The back-end ratio is all monthly debt payments (including housing) divided by gross income. Most conventional loan programs want a back-end DTI under 43–45%. FHA loans sometimes go up to 50%.

Notice that those limits are higher than the 36% in the classic rule. That's intentional from the lender's perspective. A lender's risk is default — they care whether you can make the payment, not whether making the payment leaves you with any quality of life. Your personal budget needs to be more conservative than what a lender will technically approve.

So What's Your Real Number?

Here's a cleaner way to think about it. Take your monthly take-home pay — not gross, actual take-home. Multiply by 25%. That's the maximum housing payment (PITI + PMI + HOA) that gives you breathing room for everything else: groceries, car, savings, healthcare, entertainment, and life's endless surprises.

Use a mortgage calculator to find what loan amount that payment supports at current rates. Add your down payment. That's your real ceiling.

If that number is lower than what you hoped, you have three levers: earn more, save a larger down payment, or buy in a lower-cost area. There's no fourth lever. Anyone who tells you otherwise is probably selling something.

One Last Thing

A mortgage calculator is genuinely your best friend here — not a loan officer, not a real estate agent, not a relative who bought in 2012 and thinks real estate always goes up. A good calculator lets you plug in your real income, your real debts, current interest rates, and actual tax and insurance estimates for the specific area you're looking at. It shows you the monthly number before you fall in love with a house.

Run the numbers before you tour homes. Decide on your ceiling before someone shows you a beautiful kitchen. Because once you've stood in that kitchen, you'll find reasons to make it work — even when the spreadsheet clearly says it doesn't.

Marco eventually sold his house at a small loss after four years. He rents now and says he sleeps better than he has in years. He's also saving aggressively and plans to buy again — this time with a number he arrived at himself, not one a banker handed him in an envelope.