Ask a financial planner how much of your income should go to housing and you will almost always get the same two numbers: 28 and 36. They are not magic, and they are not the whole story — but after six decades of use in the American mortgage market, they remain the fastest way to sanity-check whether a house (or an apartment) actually fits your income.
Here is the short version. No more than 28% of your gross income should go to housing costs, and no more than 36% should go to all of your debt payments combined. The first number is called the front-end ratio. The second is the back-end ratio — also known as your debt-to-income ratio. This guide explains what both of them actually count, what lenders really allow in 2026 (a very different number), and how to run the math on your own paycheck.
What the 28/36 rule actually measures
The two numbers are caps on two different totals, both measured against your gross — that is, pre-tax — monthly income.
The 28 is the housing cap. Your total monthly housing payment — mortgage principal and interest, property taxes, homeowners insurance, HOA dues, and private mortgage insurance if you have it (the full PITI, plus extras) — should not exceed 28% of your gross monthly income. Notice what is included: not just the loan. Taxes and insurance can easily add $400 to $800 a month on top of a payment that looked tidy on a lender's worksheet.
The 36 is the debt cap. Add up every recurring debt payment you owe each month — the housing payment above, plus car loans, student loans, minimum credit card payments, personal loans, and child support — and that total should stay under 36% of gross income. Utilities, groceries, subscriptions, and retirement contributions do not count. The rule cares about debt, not spending.
The gap between the two caps is the quiet part of the rule. If housing takes the full 28%, only 8 percentage points remain for every other debt in your life. On a $7,500-a-month income, that is $2,100 for housing and $2,700 for all debt combined — leaving just $600 for the car, the student loan, and the cards. This is where most budgets quietly fail the rule: the house fits, but the life around it does not.
Run the numbers on your own income
The math takes ten seconds. Take your gross monthly income, and find 28% and 36% of it:
| Annual income | Monthly gross | 28% housing cap | 36% debt cap | Left for other debts |
|---|---|---|---|---|
| $60,000 | $5,000 | $1,400 | $1,800 | $400 |
| $90,000 | $7,500 | $2,100 | $2,700 | $600 |
| $120,000 | $10,000 | $2,800 | $3,600 | $800 |
| $150,000 | $12,500 | $3,500 | $4,500 | $1,000 |
That last column is the one people skip. At $90,000 a year with a $2,100 housing payment, you have $600 of monthly debt headroom left. A single car payment can eat that whole cushion. This is why the back-end ratio is the one that quietly decides whether a mortgage feels comfortable or crushing — it is not about the house, it is about everything else you still have to pay for.
What the rule looks like at 2026 mortgage rates
Rates change what 28% buys. In mid-October 2026, Freddie Mac's weekly survey put the average 30-year fixed mortgage at 7.40% — the highest reading since late 2023. At that rate, principal and interest alone on a $350,000 loan come to about $2,423 a month.
That payment alone already exceeds the 28% cap on a $7,500 monthly income ($2,100). To fit the loan itself under 28%, a borrower would need about $8,655 in monthly gross income — roughly $104,000 a year. Add typical property taxes and insurance (say $600 a month combined) and the full housing cost climbs to about $3,023, which needs roughly $129,600 a year of income to stay under 28%.
None of this means a $350,000 home is out of reach on less income — a larger down payment shrinks the loan, and lenders will approve higher ratios (more on that below). But it shows why the rule is worth running before you fall in love with a house: in a 7%-plus rate world, the payment math is unforgiving, and the payment you can be approved for is often bigger than the payment you can comfortably live with.
What lenders actually approve in 2026
Here is the part that surprises people: the 28/36 rule is not the legal ceiling. It is the comfort line. Lenders will go well past it — because they can sell the loan or foreclose if you cannot pay, while you are the one who has to live with the payment.
| Program | Front-end | Back-end limit |
|---|---|---|
| Conventional (Fannie Mae / Freddie Mac) | No fixed cap | 45% typical; up to 50% with strong credit and reserves |
| FHA | 31% | 43% standard; up to 50%+ with compensating factors |
| VA | No fixed cap (residual income test) | 41% guideline; higher with strong residual income |
| USDA | ~29% | 41% |
So a lender might happily approve a back-end ratio near 45% that the 28/36 rule says you should avoid. That is not a contradiction — it is a difference of perspective. The lender is asking "will this loan probably perform?" You should be asking "will I still be saving money and sleeping well?" Use the 28/36 rule for the second question, and let the lender's caps answer only the first. One more thing the research confirms: lower DTI still unlocks better pricing, because to a lender, a borrower at 36% is simply a safer bet than one at 47%.
Renters: the same rule, slightly renamed
Landlords usually run a simpler screen — the 30% rule: annual rent should be under 30% of gross income. It is the 28% housing cap with a rounder number. The same logic applies to rent plus renters insurance: if rent eats 40% of your gross pay, you are house-poor without owning a house.
Renters arguably need the cushion more than buyers. A fixed mortgage payment never changes; rent resets. A payment that was 28% of your income last year can be 32% after a renewal increase — which means the comfortable rental is the one that starts a little under the line, not on it.
When stretching past 28% is defensible
Rules of thumb are starting points, not jail cells. Going past 28% on housing can be reasonable when:
What does not count as a reason: assuming rates will fall and you will refinance. Budget for the payment you are signing, and treat a future refinance as a bonus, not a plan.
Three ways to get under the line
If the math does not fit, only three levers exist:
1. Shrink the housing cost. A bigger down payment, a less expensive home, or — for renters — a roommate or a cheaper neighborhood. Every $10,000 off the loan saves roughly $69 a month at 7.40%, so small reductions compound into real breathing room.
2. Kill other debt before you shop. This is the fastest lever. Paying off a $480 car payment on a $7,500 income frees up 6.4 percentage points of back-end ratio — often the difference between failing and passing. Lenders look at monthly minimums, not balances, so target the payment, not the balance.
3. Raise the income side. A raise, a second income, or documented side income with a two-year history (lenders typically want to see it sustained). The slowest lever, but the only one that raises both caps at once.
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Spend up to 28% of gross income on housing, keep all debt under 36%, and you will rarely regret a housing decision. Lenders will approve far more than that — up to 45% or 50% of your income in debt — but "approved" is their risk calculation, not your life. Run your own numbers, leave room for the rest of your budget, and let the comfort line, not the ceiling, choose your house.