How Much House Can I *Actually* Afford?

Affording a home right now isn’t easy. The typical age of a first-time home buyer in America is now 40 years old — a record high, up from the late 20s in the 1980s.[1]

If you're like a lot of hopeful home buyers, you've been in a holding pattern — browsing local listings, refreshing the mortgage rate tracker, and running napkin math hoping the numbers will work in your favor. The question you keep coming back to: how much house can I actually afford?

The question has two answers, and they're rarely the same number. There's what a lender will approve you for — a ceiling based on your income, debts, and credit. And there's what you can comfortably carry every month for the next 30 years without dipping into savings or living paycheck to paycheck. The first arrives in the form of a pre-approval letter. The second is on you to figure out.

This article will walk you through the math — including how to stress-test your budget and factor in the costs lenders don't account for.

Home affordability calculator

Enter your annual household income, monthly debt payments, planned down payment, credit score, and any monthly HOA fees for the home you're considering. Pick a loan term (30- or 15-year fixed) and select your state — the calculator will auto-fill the mortgage rate, property tax, and homeowners insurance figures from national and state averages. Override any of those defaults with real numbers from a specific property or lender quote if you have them.

The calculator returns three outputs: your estimated maximum home price, your monthly payment broken down into principal, interest, taxes, and insurance (PITI), and the cash you'll need at closing. It also flags whether the monthly payment lands in an "affordable," "stretching," or "aggressive" range relative to your income and existing debts.

How to calculate affordability

Affordability boils down to four things working together — what you earn, what you owe, what you can put down, and what the loan costs to carry. The calculator above turns those four factors into a max purchase price. The definitions below explain what each one is and how moving it changes the answer.

Annual household income

Annual household income is the combined gross (pre-tax) income of every borrower on the loan. Lenders divide it by 12 to get the monthly figure they plug into their debt-to-income calculation. At a 6% rate, a $10,000 bump in household income typically increases your borrowing power by roughly $30,000 to $50,000, depending on your debts.

Lenders count salary, hourly wages, and consistent self-employment income. Bonuses, commission, and overtime usually need a two-year track record before they're factored in, so first-year contractors and recent commission earners shouldn't assume their full annual take is on the table.

Monthly debt obligations

Monthly debts are the recurring payments lenders count against your income: credit card minimums, auto loans, student loans, child support, and any installment loans. Every dollar of monthly debt directly subtracts from what's available for a mortgage payment.

The leverage here is real. "Just $400 a month in extra debt payments can cost you $60,000 to $80,000 in purchasing power," says Angie Carlen, a HUD-Certified Housing Counselor in southeastern Illinois who works with first-time buyers. [2] Lenders don't count utilities, groceries, gas, daycare, or subscriptions in this calculation — those costs are on you to plan around.

Credit score

Your credit score is a three-digit number that lenders use to gauge how reliably you've paid back debt, and it directly determines the interest rate you're offered. Most conventional lenders require a minimum of 620. FHA goes as low as 580 (or 500 with 10% down). VA loans have no hard floor, but most lenders enforce 620. However, the higher your score, the better your rate — and the lower your monthly payment.

"Credit score is one of the most expensive variables in the whole equation, and it's one that buyers — especially young first-time home buyers — underestimate the most," Carlen says. On a $300,000 loan, the difference between a 620 score and a 760 is about $150 more per month and over $50,000 in extra interest over the life of the loan. "Think about that," says Carlen. "That's a car. That's a kid's college fund."

Down payment

Your down payment is the cash you bring to the closing table — the chunk that doesn't get financed. The rest of the purchase price becomes the loan, which means a bigger down payment translates to a smaller mortgage and a lower monthly bill. "A lot of people think you have to put 20% down," Carlen says, "but you don't." Minimums depend on the loan type: Conventional loans go as low as 3%, FHA requires 3.5%, and VA and USDA loans allow qualified buyers to put down nothing. The median first-time down payment in 2025 was 10%. [1]

That doesn't mean 20% isn't worth aiming for. On a conventional loan, anything below 20% triggers private mortgage insurance (PMI) — a monthly add-on, typically 0.5% to 1.5% of the loan balance per year, that protects the lender if you default. PMI drops off automatically once you cross 20% equity. Beyond that threshold, every extra dollar you put down still helps: it shrinks the loan and lowers your monthly principal and interest payment for the life of the mortgage.

Interest rate

Your interest rate is your annual cost of borrowing, expressed as a percentage of the loan balance — and it drives a huge share of your monthly payment. The calculator above pulls the current average rate from Freddie Mac's weekly Primary Mortgage Market Survey based on your credit tier, but you can override it with whatever rate you've been quoted.

As of late April 2026, the 30-year fixed rate sits around 6.2%. [3] At today's rates, a one-point swing (e.g., 6.2% to 7.2%) increases the monthly payment on a $300,000 loan by roughly $200.

Loan term

The loan term is the length of time you'll spend paying off the mortgage — most buyers choose a 30-year or 15-year fixed-rate loan. The 30-year stretches payments out so each one is smaller. A 15-year is roughly 30–35% higher per month on the same loan, but you'll pay far less interest over time.

On a $300,000 loan at 6.2%, that's about $1,839/month for a 30-year versus $2,564/month for a 15-year. Most first-time buyers default to 30-year because the 15-year monthly is too steep to qualify at the same price point.

Property tax

Property tax is an annual local tax based on your home's assessed value, paid monthly into an escrow account along with your mortgage. Rates vary dramatically by state — from 0.27% of value in Hawaii to 2.23% in New Jersey, with a national simple average around 0.86%. [4]

The catch: your property tax bill rarely stays put. Most states reassess after a sale, which can push your year-two tax bill hundreds of dollars per month higher than year one. Even without a reassessment, property taxes climbed roughly 12% on average between 2021 and 2023, [5] and most homeowners see them creep up most years. Carlen tells first-time buyers to expect property taxes (and homeowners insurance) to increase essentially every year — and to budget for it.

Homeowners insurance

Homeowners insurance protects the lender (and you) against losses from fire, weather, theft, and liability — and lenders require it as a condition of closing. Premiums climbed 57% nationally between 2019 and 2024, [5] and they vary widely by state — coastal Florida, Texas, and California buyers may pay many times more than the national average.

HOA fees

Homeowners association (HOA) fees are monthly or quarterly dues paid to a neighborhood or condo association for shared maintenance, amenities, or services. Fees range from $0 in unrestricted neighborhoods to $500 or more per month for condos with significant amenities, and lenders count them as a monthly housing expense — meaning they directly reduce how much mortgage you can carry.

Before you buy a property with an HOA, check the association's reserve fund and history of special assessments. A poorly funded HOA can hit you with a surprise five-figure bill for a roof or elevator repair on top of monthly dues.

Debt-to-income ratio (DTI)

Your debt-to-income ratio is the percentage of your gross monthly income that goes to debt payments — the single most important number underwriters look at. There are two flavors. Front-end DTI counts only your housing costs (PITI plus any HOA). Back-end DTI counts housing plus everything else on your monthly debt schedule, from credit cards to student loans.
Ceilings vary by loan program:

• Conventional: When applying for a conventional loan, DTI is typically capped at 45–50% back-end, with no separate front-end limit (though lenders may apply their own front-end overlay around 28%). [6]
• FHA: On an FHA loan, 31% front-end and 43% back-end are standard caps, with the back-end allowed up to 50% when the borrower has compensating factors such as 3+ months of cash reserves, an exceptional credit score, or no discretionary debt — meaning you pay off credit cards in full each cycle and don't carry car or student loan payments. [7]
• VA: VA loans have no fixed ceiling — uses a residual income test instead, which measures what's left after housing, taxes, debts, and basic living expenses. [8] "VA wins every time when the borrower has the eligibility for it," Carlen says — no down payment, no PMI, and the residual-income approach often qualifies veterans who'd be tight on conventional DTI.
• USDA: 29% front-end and 41% back-end is standard on a USDA loan, with exceptions possible for strong borrowers.

When factoring existing debts into the equation, two buyers can earn the exact same salary and land at very different affordability numbers. Carlen sees this routinely. Take two households making $90,000 a year:

“The first one has no debt. They have about a 760 credit score, and they've saved about 20%. They're looking at a max preapproval somewhere around $360,000 to $400,000," Carlen says. "But the comfortable number — the one that helps them keep saving and breathing — is going to be closer to $280,000 or $300,000."

The second household has the same paycheck but a different balance sheet. "The second household makes the exact same $90,000, but they have a car payment, a couple of credit cards, student loans that are about $700 a month, and they have about 5% saved. They have about a 660 credit score," Carlen explains. "So their max preapproval drops to roughly $230,000 to $260,000, and a more comfortable number is going to be closer to $200,000."

Same income, wildly different affordability numbers. The second buyer qualifies for less house because their existing debt eats their DTI and their lower credit score raises their rate — not because they make less, notes Carlen.

How much house can I afford with my salary?

To get a realistic idea of how much house you can afford, most lenders and financial planners start with the 28/36 rule. It says your housing costs should stay at or below 28% of your gross monthly income, and your total debt payments — housing plus everything else — should stay at or below 36%. It originated as a conservative lender benchmark and remains the most-cited shorthand for affordability.

The 28/36 rule is a useful starting point, but it can break down when you start factoring in daily costs that lenders don't consider. As Carlen puts it: "28% might be fine for a dual-income couple with no kids and no car payment. That same 28% can wreck a single parent paying daycare and commuting an hour each way." Complicating matters further is the fact that some lenders will approve borrowers with a backend DTI of 45% (or even more).

Carlen's personal benchmarks are tighter than what most lenders allow. She tells clients to aim for housing at 25% of take-home pay and total debt around 36% of gross. Housing in the high 20s to low 30s of gross with back-end debt in the high 30s to low 40s, she considers "stretching." Anything over 35% gross on housing or 43% back-end is risky territory. "43% back-end debt-to-income ratio is really where I start getting anxious on a client's behalf — there's no room in that budget for anything to go sideways," she says.

What a lender might approve you for at common salaries

While you might be able to afford your dream house on paper, a lender's max preapproval number rarely syncs with what you can comfortably afford.

To clarify the gap between lender approval and affordability, here's how much a lender might qualify you for at different salaries based on the conservative 36% back-end DTI rule vs. a more aggressive 45% back-end DTI.

Using the DTI threshold of 45%, a lender could realistically approve you for 27% to 42% more house than the conservative 28/36-rule benchmark says you can afford — and considerably more than what most financial planners or HUD counselors would call genuinely comfortable.

"A lender is answering one question when they preapprove you: Will this borrower default? That's it," explains Carlen. They're not asking whether you'll be comfortable, whether your car's on its last legs, or whether daycare is coming next year. None of that lives in the math.

"When I have a client tell me the bank says we can afford $400,000, I tell them the bank says you probably won't default at $400,000. Those are two different sentences. Preapproval is your ceiling, not the number you really want to target."

Based on the patterns Carlen sees in her practice, a first-time buyer's preapproval typically lands 20% to 30% above the comfortable target at the same income. And that's where borrowers can end up house poor. A home at your lender's max doesn't really cost 45% of your income to own. It costs that, plus 1% to 3% of value a year for maintenance, plus closing costs in year one, plus what Carlen calls "the trips to Lowe's or Home Depot every Saturday for the first six months." As Carlen tells her clients, "the lender will write the loan if it works on paper — they're not going to ask whether you're sure."

A practical move when your preapproval letter lands: Ask your loan officer to run quotes at 80%, 70%, and 60% of the approved amount. Compare the monthly PITI at each. Then decide where on that slider you can actually breathe.

Other costs to factor into your budget

The Harvard Joint Center for Housing Studies reports that 20.3 million homeowner households — 24% of all owners — are now cost-burdened, paying more than 30% of their income on housing. Much of this can be attributed to marginal housing costs: homeowners insurance is up 57% nationally since 2019, and property taxes have risen 12% on average between 2021 and 2023. [5]
When a lender pre-approves you, they look at four pieces of your monthly payment — principal, interest, taxes, and insurance (PITI), plus any HOA. However, there are the other costs that you should also factor in.

• Upfront costs (one-time): Closing costs run 2–5% of the purchase price — $8,000–$20,000 on a $400K home, covering lender fees, title insurance, recording, escrow, and prepaid taxes and insurance. [9] Budget another $1,000–$5,000 for moving, plus utility deposits and any replacement furniture.
• Maintenance reserve (ongoing): HUD recommends setting aside 1–3% of home value annually for routine upkeep — gutters, HVAC service, lawn equipment, paint, small repairs. On a $300K home, that's $3,000–$9,000/year, or $250–$750/month you should be banking.
• Big-ticket repairs (irregular): Roofs, HVAC systems, water heaters, and major appliances all fail on their own schedule — and they tend to cluster in the first few years if the previous owner deferred maintenance. Carlen quotes the typical bills: water heaters $1,500–$2,500, HVAC systems $5,000–$10,000, and a roof replacement easily $8,000–$20,000+.
• Utilities (ongoing): Expect $200–$400/month for electric, gas, water/sewer, and trash in most U.S. markets, plus internet. The jump from apartment to single-family home catches most renters off guard — you're now heating and cooling more square footage.
• Lifestyle costs after closing: Lawn care, pest control, snow removal, alarm monitoring — and what Carlen calls the inevitable "trips to Lowe's or Home Depot every Saturday for the first six months. That adds up."
• Costs that creep up year over year: Property taxes can spike after a post-sale reassessment (especially in your first year as the new owner), and insurance premiums climb at renewal — often $50–$150/month higher in high-risk markets. Build a buffer for both.

Carlen's rule of thumb: Have at least $2,000–$3,000 in untouchable savings when you close — separate from your down payment, closing costs, and moving budget. As she puts it, "You know something is going to break." The hidden costs start the day you get the keys.

How to stress test your home buying budget

Pre-approval math assumes your income, expenses, and rates stay frozen at closing. Real life rarely cooperates
Before you sign for a 30-year mortgage, run the payment through a real-world test — what Carlen calls "the dress rehearsal."

Three-month dress rehearsal

1. Calculate your projected all-in monthly housing cost at the home price you're targeting. Use the calculator above to estimate PITI, then add any HOA dues, a maintenance reserve (1–3% of home value divided by 12), and any expected increase in utilities. That's your real number.
2. Find the gap between that number and your current rent. If your projected housing cost is $2,800/month and you're paying $1,800, the gap is $1,000.
3. Auto-transfer the gap into a separate savings account every month for at least three months. The point isn't to save — it's to live as if you already had the mortgage.
4. See if the rest of your life still works. Are you eating out less? Putting things on credit cards? Skipping the gym? Falling short on groceries? Those are the pressures that show up in month one of owning a home, except the bank doesn't care.

"If you can't make it three months and your budget doesn't work, that doesn't mean you can't ever buy a house," Carlen says. "It just means right now may not be the best time."

Stress-test for fluctuating income

Pre-approval math also assumes your paycheck shows up like clockwork for the next 30 years. Carlen pushes clients to ask the harder question: What if one income disappears?

"For every $10,000 you want to make a year, it takes about 30 days to find a job like that," she says, drawing on her HR background. A $100,000 earner who loses their job isn't likely to land equivalent work in a single month — but the mortgage payment still comes due on the first. Two-earner households should run the math on a single salary. Solo earners should price in a four- to six-month income gap and confirm their reserves can cover it.

How to boost your home buying power

For many buyers in this rate environment, the math just doesn't work yet — and that's not failure, it's the market. NAHB's Cost of Housing Index shows that a family earning the median household income ($104,200) now needs to allocate 34% of their income to cover a median-priced home, well above the 28% the rule of thumb allows.[10]

If you're concerned about stretching your budget too thin, sometimes the smartest move is to give yourself another year before applying for a home loan.

"What would renting another year while you stack savings look like to you?" Carlen often asks her clients. "I don't feel like that's you failing. I feel like it's a strategy for success." There are concrete moves you can make in the 6 to 12 months before you buy that meaningfully change what you can afford.

Five levers to pull before you apply

• Pay down high-monthly-payment debt first. The same leverage that puts $60,000–$80,000 of purchasing power at risk over a $400/month debt also runs in reverse: paying off the auto loan or credit card with the biggest monthly hit can move your max purchase price meaningfully. Target the monthly payment, not the balance.
• Raise your credit score by 20 to 40 points. Pay revolving balances down to under 30% utilization, dispute any errors on your credit report, and avoid opening new accounts in the year before applying. Carlen has seen clients move scores meaningfully in as little as four months once they get disciplined.
• Build a larger down payment — without draining reserves. Every additional percentage point shrinks the loan and lowers PMI. But dropping below two months of housing payments in liquid savings to chase a bigger down payment is a bad trade.
• Look into down payment assistance. Most states run grant or forgivable loan-based down payment assistance programs for first-time buyers. In Illinois, Carlen's clients routinely combine state programs like Illinois Housing Development Authority assistance — which can put $7,500 to $10,000 toward a down payment and closing costs — with Federal Home Loan Bank grants. The money is there; most buyers don't know to ask.
• Pick a loan product that fits your situation. VA loans offer zero down, no PMI, and no fixed DTI ceiling for eligible veterans. USDA loans allow zero down in approved rural areas, which cover more of the map than most buyers realize. Either can outperform a conventional loan on monthly costs when you qualify.
• Flex where and what you search for. Before you decide the numbers don't work, look at adjusting the search itself. "What if you looked an hour out from where you're searching? That could change the numbers," Carlen tells clients. A townhome or condo can also serve as a bridge to a single-family home later, when your equity and income catch up.

Talk to a loan officer to see if a conventional is right for you

Whether you’re thinking of applying for a mortgage today or in a few months, connecting with a loan officer now can help. An experienced loan officer can look at your current financial profile and advise you on your mortgage options.

At Best Interest Financial, we provide personalized, white-glove service that big-box and automated lenders can’t. With over 80 years of combined experience and billions in closed loans, our loan officers have the expertise to help identify creative financing possibilities that others miss.

No matter what your timeline is, we can help you develop a strategy to reach your goals and get you on the path to home ownership. Get a free, 60-second quote from Best Interest today to learn more.

FAQs

Is the 28/36 rule outdated?

Not outdated, but incomplete. It's still the starting point most lenders use, and it works as a useful sanity check. Its blind spot is variable expenses — childcare, insurance spikes, irregular repairs, and the lifestyle costs lenders never see — that can dramatically change what "affordable" feels like in practice. Treat the rule as the floor of your comfort range, not the ceiling.

How much should I save before I buy?

Plan for three buckets: your down payment (3–20% of the purchase price, depending on the loan), closing costs (2–5%), and a reserve for early-homeownership surprises. On a $300,000 home with 10% down, that's roughly $30,000 down, $6,000–$15,000 in closing costs, and at least $2,000–$3,000 in untouchable savings — putting you around $38,000–$48,000 in cash at closing.

What's the difference between prequalification and preapproval?

Prequalification is a soft estimate based on the numbers you tell the lender — no documents reviewed, no credit pulled. Preapproval is a formal underwriting review: the lender pulls your credit, verifies your income and assets, and issues a letter that sellers actually take seriously. Get the preapproval before you make offers in a competitive market — prequalification alone won't carry weight.