The classic answer fits in one sentence: keep your housing payment under 28% of your gross monthly income, and all your debt payments combined under 36%. That is the 28/36 rule, and it has survived decades of rate cycles because it keeps buyers out of payments that slowly strangle the rest of their life.
But the one-sentence answer hides the two questions that actually decide your budget: what counts as “housing payment,” and whose definition of affordable you trust - the lender’s or yours. Those are rarely the same number.
This guide walks through both, with a worked example at July 2026 rates, so you can put a real dollar figure on your own situation.
Start with the 28/36 rule
The rule uses your gross income - pay before taxes and deductions, the number on your offer letter. If gross vs take-home is fuzzy, gross pay vs net pay sorts it out in five minutes.
| Gross annual income | Gross monthly | 28% housing cap | 36% total-debt cap |
|---|---|---|---|
| $60,000 | $5,000 | $1,400 | $1,800 |
| $80,000 | $6,667 | $1,867 | $2,400 |
| $100,000 | $8,333 | $2,333 | $3,000 |
| $120,000 | $10,000 | $2,800 | $3,600 |
| $150,000 | $12,500 | $3,500 | $4,500 |
Two caps, two jobs:
- The 28% front-end cap covers your full housing payment - not just the loan, but property taxes, homeowners insurance, and mortgage insurance if you owe it. That bundle is called PITI (principal, interest, taxes, insurance); our PITI guide breaks down each piece.
- The 36% back-end cap adds every other monthly debt: car payments, student loans, credit card minimums, personal loans. If your housing fits 28% but a car payment blows the 36% line, the car is the problem the numbers are pointing at.
The 28/36 rule is a guideline, not a law - lenders use their own cutoffs, and plenty will approve you well past it. Treat it as the comfort line rather than the approval line.
A worked example at July 2026 rates
Say you earn $100,000. Your 28% cap is $2,333 a month for the whole housing bundle.
Now work backward. Set aside, say, $550 a month for property taxes and insurance - a mid-range guess that varies a lot by state and coverage. That leaves $1,783 for principal and interest. At 6.43% - the average 30-year fixed rate in Freddie Mac’s national lender survey as of July 2, 2026 - a $1,783 payment supports a loan of roughly $284,000.
Add your down payment to that loan amount and you have your price range. With $40,000 down, you are shopping around $324,000. With $70,000 down, around $354,000.
Notice what the math just did: it turned a six-figure salary into a loan of about 2.8 times income. The old “3 to 4 times your income” shortcut dates from lower-rate eras - at mid-2026 rates, the honest multiple sits lower. Rates move weekly, so run the mortgage calculator with today’s rate and your own tax estimate rather than trusting any fixed multiple.
When your other debts set the budget
That first example found the 28% front-end cap. But if you carry a car payment or student loans, the 36% back-end cap is usually the one that actually decides your number - and the math shows why.
Take the same $100,000 earner, now with $450 a month on a car, $250 in student loans, and a $100 credit-card minimum: $800 of monthly debt before a mortgage enters the picture.
| No other debt | With $800/mo of other debt | |
|---|---|---|
| 36% total-debt cap | $3,000 | $3,000 |
| Less existing debt payments | - $0 | - $800 |
| Left for the housing payment | $2,333 (28% cap binds) | $2,200 (36% cap binds) |
| After ~$550 taxes + insurance | $1,783 for P&I | $1,650 for P&I |
| Supportable loan at 6.43% | about $284,000 | about $263,000 |
In the first column, the 28% housing cap ($2,333) is the limit, because there is no other debt to worry about. In the second, the 36% cap bites first: $3,000 minus $800 leaves only $2,200 for housing, below the 28% line. That $800 of payments quietly knocked roughly $21,000 off the loan this income supports - the house shrank, and not one dollar of the shrinkage was the mortgage itself. Clear a car loan before you shop and you may hand yourself a bigger, calmer budget than any amount of rate-shopping would.
What lenders actually check
Lenders run a sharper version of the same logic:
- Debt-to-income ratio (DTI). All your monthly debt payments divided by your gross monthly income - the CFPB (Consumer Financial Protection Bureau, the federal consumer watchdog) calls this the core measure of whether you can manage the payment. Different loan programs and lenders set different DTI limits, and many approve ratios well above 36%.
- Credit score. It does not change how much you can borrow so much as what rate you pay - and the rate quietly sets how much house each dollar of payment buys.
- Down payment and reserves. Lenders want to see where the cash is coming from, and some want extra months of payments left in the bank after closing.
- Loan size. Standard conventional loans (the kind Fannie Mae and Freddie Mac buy) cap at $832,750 in most of the US for 2026, per the Federal Housing Finance Agency. Above that you are into jumbo territory, with stricter requirements.
Here is the part worth underlining: the lender is checking whether you can repay. They are not checking whether you can repay while also saving for retirement, covering daycare, and taking a vacation. An approval is a ceiling, never a recommendation.
The down payment reality
The 20%-down rule is the most persistent myth in homebuying. The real minimums, verified against the agencies that set them:
- Conventional loans: as low as 3% down through programs like Freddie Mac’s Home Possible and HomeOne.
- FHA loans (government-insured loans with more flexible credit rules): as low as 3.5% down, per the CFPB.
- 20% down is simply the point where you skip PMI (private mortgage insurance, a monthly charge that protects the lender). Below 20%, expect PMI on a conventional loan - typically $30 to $70 a month per $100,000 borrowed. Our PMI guide covers what it costs and how to get rid of it.
Small down payments are legitimate - waiting years to hit 20% while prices and rents climb is its own cost. Just budget the full picture: a smaller down payment means a bigger loan, a bigger payment, and PMI on top.
And do not let the down payment absorb every dollar you have. Closing costs typically run another 2% to 5% of the purchase price, due on signing day - closing costs explained itemizes them - and moving, repairs, and furniture arrive in the same season.
Approved vs actually affordable
The gap between what a lender will approve and what feels comfortable can be enormous. Before you shop at the top of your approval, pressure-test the payment:
- Practice the payment. For two or three months, move the difference between your current rent and the target payment into savings. If the months feel tight, the house is too big - and you banked cash finding out.
- Keep your emergency fund intact after closing. Owning means the furnace is your problem now. How much emergency fund covers the target; homeowners should sit at the higher end.
- Clear expensive debt first. Every $300 car payment is roughly $300 of housing budget gone, per the 36% cap. If debt is eating your ratio, avalanche vs snowball shows the fastest ways out.
- Budget on take-home, not gross. The 28/36 rule uses gross income because lenders do, but your life runs on net. Sanity-check the payment against your actual paycheck with the take-home pay calculator.
Common mistakes that break the budget
- Shopping at the top of the pre-approval. A pre-approval is the lender’s maximum, built from your gross income and your debts - not your daycare bill, your retirement contributions, or your travel. Treat the approval number as a ceiling to stay well under, never a target to hit.
- Budgeting the “P&I” and forgetting the “TI.” Property taxes and insurance can add $400 to $700 a month or more, and they drift upward over time. The payment that has to fit your 28% cap is the full PITI bundle, not just principal and interest - PITI explained breaks down the whole payment.
- Leaving out maintenance. A common rule of thumb is to set aside around 1% of the home’s value a year for upkeep - roughly $330 a month on a $400,000 home - on top of the mortgage. Renters never see this line; owners cannot skip it, and a payment that only works before maintenance does not really work.
- Carrying avoidable debt into the application. As the table above showed, existing car and card payments come straight off your 36% back-end cap. Paying down a card or clearing a near-finished car loan before you apply can expand your housing budget more than chasing a slightly lower rate.
The bottom line
Start at 28% of gross monthly income for the full housing payment and 36% for all debts - then let your own numbers, not a lender’s ceiling, make the final call. At July 2026 rates, a $100,000 income comfortably supports roughly a $284,000 loan plus whatever you put down; your figure moves with your rate, taxes, and debts. Run your own numbers with a current rate quote, and buy the house that leaves your life funded - not the biggest one someone will lend you.
FAQ
Is the 28/36 rule still realistic at today’s rates?
The rule itself holds up - it caps the payment, and the payment is what you live with. What changed is how much house the capped payment buys: at mid-2026 rates around 6.4%, the same income supports a smaller loan than it did in low-rate years. The rule is doing its job; the market just moved.
My lender approved me for far more than 28%. Who is wrong?
Nobody - you are measuring different things. Lenders approve based on repayment risk, and many programs allow DTIs well above 36%. The 28/36 rule measures comfort: room left for savings, kids, and surprises. Take the smaller answer seriously.
Should I include my partner’s income?
If you are buying together and both names are on the loan, lenders count both incomes - and both sets of debts. For your own comfort math, run it once on both incomes and once on the larger income alone. If the payment only works with two full paychecks forever, you have found your risk.
Does the 28% include HOA fees?
Include them. HOA dues (homeowners association fees on condos and some neighborhoods) are mandatory and can be hundreds a month. Lenders count them in your housing ratio, and your budget should too.
Sources
- Consumer Financial Protection Bureau - debt-to-income ratio definition
- Federal Housing Finance Agency - 2026 conforming loan limit ($832,750 baseline)
- Freddie Mac My Home - down payment minimums and PMI basics
- Consumer Financial Protection Bureau - FHA loan down payment minimum
- Freddie Mac Primary Mortgage Market Survey - average rates as of July 2, 2026
