How Much House Can I Actually Afford? A Real Answer in 2026

The Question Behind the Question

"How much house can I afford" is almost always two questions wearing one trench coat. The first is what a lender will let you borrow. The second is what you can live with month after month for the next thirty years without quietly resenting the house. These numbers are rarely the same, and most of the financial pain in American homeownership comes from people anchoring on the first number and discovering the second one later.

A lender's preapproval is a ceiling, not a recommendation. It is the maximum loan their underwriting model will approve given your income, debts, credit score, and down payment, calibrated to the point where their statistical loss rate is acceptable. It is not calibrated to whether you will be comfortable, whether you can still save for retirement, whether you can absorb a roof replacement in year four, or whether your career allows for the kind of geographic flexibility that a thirty-year mortgage quietly removes. The bank is solving for default probability. You are solving for life.

This post is the working version of the right answer. It walks through the actual math, names the line items that catch people off guard, gives you a framework for picking a number you can defend to yourself, and points you at a calculator when you need to put real figures in.

The Numbers a Lender Actually Uses

Modern mortgage underwriting in the US runs on a small handful of ratios. The most important is your debt-to-income ratio, or DTI. The front-end version compares your proposed total housing payment to your gross monthly income. The back-end version adds your other recurring debts — car loans, student loans, minimum credit card payments, child support. Most conventional underwriting will tolerate a back-end DTI up to about 43%, which is the threshold codified in the Qualified Mortgage rule. Some loan programs go higher with compensating factors. None of those numbers are aspirational targets. They are the line beyond which the bank starts to worry, which is a different question from where you should start to worry.

The older rule of thumb here is the 28/36 rule: housing should not exceed 28% of gross monthly income, and total debt should not exceed 36%. It comes out of decades of mortgage underwriting at Fannie Mae and Freddie Mac, and it is conservative by current standards. It is also closer to what most financial advisors actually recommend than the legal maximum. The gap between 28% and 43% is where a lot of people get themselves into trouble — they qualify for the 43% number and then live the 28% advice was trying to protect them from.

The second number the bank cares about is your loan-to-value ratio, or LTV. This is the size of the loan divided by the appraised value of the home. Conventional loans get the best pricing at 80% LTV or lower, which means a 20% down payment. Below that, you pay private mortgage insurance, which we will return to in a moment. FHA and VA loans allow much lower down payments under their own rules, with their own insurance structures. The 20% number is not magic, but it is the threshold the rest of the industry is organized around.

What Actually Shows Up On Your Monthly Statement

People think of a mortgage as "the loan payment." It is at least four things, and often five. The industry shorthand is PITI: principal, interest, taxes, insurance. If your down payment is under 20% you add PMI for a fifth line. If you buy in a planned community, add HOA dues as a sixth. The interesting feature of this stack is that the loan payment itself — principal and interest — is often a minority of the total once you add everything up, and it is the only piece that is fixed.

The principal-and-interest part is calculable from three inputs and a formula. The loan amount, the annual interest rate divided by twelve, and the number of months in the term. The standard amortization formula gives you a fixed monthly payment for the life of the loan, where the early years are mostly interest and the late years are mostly principal. This is the part of the math that does not change once you sign. On a $300,000 loan at 6.5% over 30 years, the principal-and-interest payment is about $1,896. Run that number on a 7% rate and it becomes $1,996. A single percentage point of rate is roughly $100 a month per $100,000 borrowed — a useful number to keep in your head when shopping.

The taxes line is where the picture turns local. Property tax rates vary from roughly 0.3% of assessed value annually in Hawaii to over 2% in parts of New Jersey, Illinois, and Texas. On a $400,000 home in a 2% jurisdiction, that is $8,000 a year, or $667 a month, paid into an escrow account that the lender then forwards to the county. This number can increase every year, sometimes dramatically after a reassessment. It is not a fixed cost in the way the loan is.

Homeowner's insurance has become one of the more volatile pieces of the stack. Premiums have risen sharply in markets with elevated climate risk — Florida, California, parts of the Gulf Coast — and insurers have withdrawn from some markets entirely. A typical annual premium might run $1,200 to $3,000 on a middle-bracket home in a low-risk area, with a wide range above that. Like taxes, it is escrowed and updated yearly.

PMI applies when your down payment is under 20%. It runs roughly 0.2% to 2% of the loan amount annually, depending on your credit score and how deep below 20% you are. A common midpoint is around 0.5%, which on a $300,000 loan is about $125 per month. PMI eventually drops off when your equity reaches 22%, though you can sometimes request removal at 20% with an appraisal. It is real money, and it is the single biggest argument for putting 20% down if you can.

Running the Math On Yourself

Once you have a sense of how the pieces fit, the actual arithmetic is fast. Pick a home price, a down payment, a rate, and a term, and add reasonable estimates for property tax and insurance. The mortgage calculator handles the formula and the escrow pieces in one screen, including the PMI add-on when your down payment falls below 20%. It is not designed to give you a verdict — it is designed to make the tradeoff visible. Move the down payment up by $20,000 and watch the monthly drop. Bump the rate up 0.5% and see what happens to the long-run interest paid. The numbers stop being abstract once you can poke them.

The honest workflow is to start from the monthly payment you can comfortably absorb, not from the home price you have in mind. If you have decided that $2,800 is your true monthly ceiling — meaning the number that still leaves room for retirement contributions, an emergency fund that actually grows, vacations, the occasional dinner out — work backward. Subtract estimated taxes and insurance for your target zip code. What's left is the principal-and-interest payment you can support. From that and current rates, the loan amount falls out. Add your down payment and you have the home price the math actually approves.

This is the reverse of the order most buyers run it in, which is part of why so many end up at the lender's ceiling. The bank's question is "what's the largest loan we can write?" Your question is "what monthly number lets me keep living a life I recognize?"

The Costs That Don't Appear on the Calculator

Even a calculator that handles PITI and PMI honestly is showing you a fraction of true homeownership cost. The rest of it lives outside the monthly statement and is the reason buyers who maxed out their preapproval so often end up house-poor.

Maintenance is the big one. A common rule of thumb is 1% of the home's value per year, which is rough but directionally correct. Some years are zero. Other years are a $14,000 roof, a $9,000 HVAC replacement, or a tree through the kitchen window. Average it out over a decade and the 1% figure tends to be in the right neighborhood. On a $400,000 home that's $4,000 a year, or roughly $333 a month you are not paying anyone but should be reserving for yourself.

Closing costs run 2% to 5% of the loan amount and are paid up front. Moving costs are non-trivial. The first year of a new house is famously expensive: window treatments you didn't realize the previous owner was taking, appliances that need replacing, the realization that all your old furniture looks wrong in the new rooms. None of this is on the monthly statement and all of it is on your credit card three months in.

The opportunity cost of a large down payment matters too. Twenty percent down on a $400,000 home is $80,000 of capital that is no longer in your investment accounts. The return on that capital while it sits in home equity is the appreciation of the house minus the friction costs of selling, which historically averages out to something less than what diversified equities have returned. The argument for a large down payment is not that it is the highest-returning use of the money. It is that it lowers your monthly cost, eliminates PMI, gets you a better rate, and reduces the risk of being underwater if prices fall. Those are all good reasons. They are not the same as "this is the optimal place to park your savings."

A Framework That Survives Contact With Reality

The cleanest framework I have seen runs in three layers. The bank's number is the ceiling — what you can legally borrow. The 28% rule is the recommended zone — what most financial planners would call comfortable. Your actual budget is the floor — what the rest of your life can absorb without compromise. If those three numbers happen to line up, congratulations, the decision is easy. They usually do not.

When they conflict, the right move is almost always to land at or below the 28% line, even if the bank would approve more. The reason is asymmetry. The downside of underbuying is that you have more money for everything else, including upgrading houses in five years when you actually know what you want from one. The downside of overbuying is that every other financial goal — retirement, kids' education, career flexibility, the ability to leave a job you've come to hate — gets quietly crowded out by the mortgage. The first downside is recoverable in a weekend. The second one is a decade of small compromises that nobody warned you about at closing.

None of this is a reason to be afraid of buying a home. It is a reason to do the math from the right starting point. Plug your actual numbers into a calculator, see what the monthly really looks like with taxes and insurance included, sit with that number for a couple of weeks, and decide if it is the version of your budget you want to live in. That is the answer to "how much house can I afford" — not a price, but a payment you would still pick if you ran the decision again.