How Much House Can I Afford, Based on the 28/36 Rule

By Andrew Dort | NMLS #1650297 | Last updated August 5, 2026

Most people start answering “how much house can I afford” with an online calculator. That number is usually wrong. Not because the math is bad, but because the calculator doesn’t know your taxes, your insurance, your HOA dues, or your real debt picture. Here’s what actually decides the number.

• The 28/36 rule caps housing costs at 28% of gross monthly income and total debt at 36%. It’s a guideline, not a hard limit.
• Some loan programs approve buyers well above 36%. Conventional loans can go as high as 50%, and FHA can clear borrowers even higher, up to 46.99% front-end and 56.99% back-end.
• Online calculators usually miss PMI, HOA dues, property taxes, and insurance. That’s why their number rarely matches your pre-approval.
• A $20,000 student loan in deferment can still add $100 to $200 a month to your debt calculation, even if you’re paying nothing today.
• Savings, a strong credit score, and extra income can push what you qualify for higher.
• Qualifying for a bigger loan and being able to comfortably afford it are two different questions.

What the 28/36 rule actually means

The 28/36 rule is a simple guideline lenders use to estimate how much mortgage a borrower can reasonably handle. It has two parts.

The 28% number

This is your housing cost. It covers your loan payment, property taxes, homeowners insurance, and any HOA dues. Together, those shouldn’t take up more than 28% of your gross monthly income.

The 36% number

This one is broader. It adds in every other debt you pay each month, like a car payment, student loans, or credit cards, on top of your housing cost. All of that combined shouldn’t pass 36% of your gross income.

One thing trips people up here: gross income is your pay before taxes come out, not what actually lands in your bank account. So 28% of your gross pay can feel more like 35% or 40% once you’re looking at your real paycheck.

The guideline vs. what you can actually qualify for

The 28/36 numbers get repeated so often that a lot of buyers treat them as a hard cutoff. They’re not. Federal rules require lenders to check that you can reasonably repay what you borrow, but they don’t lock every loan program to the same debt ceiling. How much debt you’re actually allowed to carry depends heavily on which loan program you use, and it can run well past 36%, up to 50% on some conventional loans and even higher on FHA.

There’s a real tradeoff either way. Staying closer to 28/36 leaves more of your paycheck free for savings and normal life. Stretching toward what a program will actually allow can get you a bigger house, but it also leaves less cushion if something goes wrong, like a job loss or a surprise repair bill.

Why your calculator number and your pre-approval number don’t match

A monthly mortgage payment is made up of several pieces, and a calculator can only guess at most of them. I’ve been originating loans since 2015, and this is something I walk through with buyers regularly. Principal and interest, the two pieces driven by your interest rate and loan amount, are the one part a calculator usually gets close to right. Everything else is a guess.

What varies by property

Property taxes vary by county, and even within a county they shift based on a home’s age, condition, and location. Homeowners insurance works the same way. It depends on the property, plus your own history as an insured person and how much coverage you choose to carry. On top of that, if your down payment is below 20%, most loans require PMI, short for private mortgage insurance. It protects the lender, not you, in case you stop paying, and it typically runs $30 to $70 a month for every $100,000 you borrow, depending on your credit. Calculators often skip it entirely or apply a generic estimate that has nothing to do with your actual credit profile.

HOA dues, the cost hiding outside your mortgage payment

An HOA fee isn’t part of your mortgage payment, but it still comes out of your budget every month. A $300,000 home with a high HOA fee can end up costing more each month than a $400,000 home with a low or nonexistent one. A calculator built around loan amount and interest rate alone will never catch that.

How your debt actually gets calculated

Two loan files that look identical on paper can qualify very differently once the real underwriting rules get applied. This is where a professional’s math and a borrower’s own napkin math tend to split apart.

A loan that’s paused but still counts

Say a borrower has a student loan currently in deferment or forbearance, meaning they’re paying $0 a month right now. Depending on the loan program, the lender may still be required to count a payment toward that borrower’s debt total anyway, commonly 0.5% to 1% of the balance, depending on the loan type. On a $20,000 student loan, that’s $100 to $200 a month added to the math, even though nothing is actually being paid today. Depending on the program, that tends to work against the borrower.

A loan that’s about to end

The opposite can also help a borrower. Say someone has a car loan with fewer than 10 months of payments left. Some loan programs let that monthly payment be left out of the debt calculation entirely, which can free up real room in the numbers. Rules like these are exactly why a loan officer’s number and a borrower’s own estimate often don’t match. It’s worth having someone run the actual numbers before you assume you know your limit.

Where the estimate goes wrong in both directions

Rough math doesn’t just risk overestimating what you can afford. It can undershoot it too, and that shows up most for first-time buyers.

When it misses real costs

Maintenance and repairs are the most common blind spot. Those costs add up fast once you own a home, and a standard calculator won’t show them to you at all.

None of this is meant to talk you out of buying. A mortgage payment builds equity over time instead of disappearing into a landlord’s pocket. It can come with a tax deduction on the interest if you itemize. And it stays fixed while rent in most markets keeps climbing.

When it approves more than you want

The opposite problem happens too. A lender might approve a much bigger loan than a borrower actually wants to pay for every month, since underwriting measures what you qualify for, not what feels comfortable to you. That’s a conversation your loan officer should have with you directly. What you’re approved for and what you actually want to pay aren’t always the same number. 

At Pride Lending, we don’t believe in putting someone into the maximum loan size possible, just because they can qualify. We believe in having a conversation with our clients and outlining their wants, needs, and goals and working from there to ensure they’re comfortable with the payment.

If you’re running the numbers yourself

Talking to a loan officer first is the more reliable path. But if you want to run your own estimate before that conversation, a few things are easy to miss.

Make sure you’re including PMI if your down payment will be under 20%, and add in HOA dues if the property has them. Also watch out for advertised interest rates that look unusually low. Some of those rates only apply if you pay a large amount upfront to buy the rate down, a cost many borrowers can’t or wouldn’t choose to pay once they understand what it actually involves.

What a loan officer actually asks before giving you a number

A loan officer usually starts with your credit, since it shapes which loan programs you’re likely to qualify for at all. Next comes your assets, which determines how much you can put down and can open up more loan options. From there, the conversation moves to your income, which sets the ceiling on what you can realistically pay each month, and finally to your existing debts, the other half of the math that turns a guess into an actual ratio.

Put together, that gives a rough number. But it’s genuinely rough. A full application, along with real documentation for your assets, income, and credit, is what turns that estimate into something you can rely on.

Compensating factors that can move your number

A borrower’s approved debt limit isn’t fixed at 28/36. A few things can push it higher, sometimes into the 40s or 50s, when the rest of the file supports it.

• Reserves: Money left in the bank after covering the down payment and closing costs shows a lender you’d have a cushion if something went wrong.
• Credit score: A strong credit history is one of the most common reasons a lender will approve a higher ratio.
• Additional qualifying income: Income that wasn’t already counted toward the application can help offset debt elsewhere in the math.
• Minimal payment shock: If your new housing payment is close to what you’re already paying in rent, that stability works in your favor.

It’s worth being honest about what “qualifying for more” actually means, though. Some loan programs allow as much as 50% of gross, pre-tax income to go toward housing. I’ll be honest about this, the fact that there are programs that allow for 50% of your gross to go to your housing expense is wild to me personally, and fiscally irresponsible. Qualifying for a payment at that level doesn’t mean it’s the right amount to take on. The guideline exists for a reason. Pushing too far past it, even when a lender will approve it, is how buyers end up house-poor.

Frequently Asked Questions

So, how much house can you afford?

A calculator can give you a rough starting point. But the real number depends on your credit, your assets, your income, and your debt, run through the actual rules of the loan program you’d use. I work with buyers across several states to get a real, documented number before they start house hunting. You can also get a rough first look with our mortgage calculator, or visit our team page to connect with a loan officer licensed in your state.