The 28/36 Rule Explained: 2026 Mortgage DTI Limits
Every mortgage qualification math problem reduces to two numbers. This is what they mean, how lenders bend them, and why staying inside the original band is the difference between owning a home and being owned by one.
· HomeScore Editorial
The 28/36 rule says housing payment ≤ 28% of gross monthly income and total debt ≤ 36%. In 2026, conventional loans frequently stretch this to 36/45 and FHA to 31/43 — but the original 28/36 band is the only one that leaves room for the 1–3% of home value real ownership consumes each year.
The two numbers, defined
Front-end DTI (the 28): add up every component of the monthly housing payment — principal, interest, 1/12 of the annual property-tax bill, homeowners insurance, mortgage insurance if applicable, HOA dues — and divide by your gross (pre-tax) monthly household income. The result should not exceed 0.28.
Back-end DTI (the 36): add the same housing payment to every other minimum monthly debt obligation showing on your credit report — credit-card minimums, auto loans, student loans, personal loans, child support, alimony — and divide by the same gross monthly income. The result should not exceed 0.36.
Two facts collapse a lot of confusion: utilities, food, and savings contributions are not counted. And the binding constraint — whichever cap you hit first — is what actually limits your home price. For a household with low non-housing debt the front-end cap binds; for households with student loans or auto payments the back-end binds.
Worked examples (2026 baselines)
Monthly income = gross annual ÷ 12. Housing cap = monthly × 28%. Total cap = monthly × 36%. Housing budget = min(housing cap, total cap − existing debt).
| Gross income | Monthly | 28% housing cap | 36% total cap | Other debt | Housing budget |
|---|---|---|---|---|---|
| $75,000 | $6,250 | $1,750 | $2,250 | $400 | $1,750 |
| $100,000 | $8,333 | $2,333 | $3,000 | $550 | $2,333 |
| $125,000 | $10,417 | $2,917 | $3,750 | $700 | $2,917 |
| $150,000 | $12,500 | $3,500 | $4,500 | $850 | $3,500 |
| $200,000 | $16,667 | $4,667 | $6,000 | $1,100 | $4,667 |
Variations lenders actually use
Why the 28/36 band still matters in 2026
The 28/36 thresholds were calibrated for a world in which homeowners insurance moved with general inflation and property-tax assessments lagged price growth by years. Both assumptions broke. Florida, Louisiana, California, and Texas have seen 30%+ insurance increases in 18 months. Assessor offices in Phoenix, Austin, Tampa, and most of the Northeast are catching up to 2021–2023 price runs. The 28/36 ceiling is the only DTI band still pricing those revisions in.
Buy at 28/36 and a $400/month insurance hike is absorbed by the maintenance reserve. Buy at 36/45 and that same hike either eats the maintenance reserve or forces a credit-card slide. The HomeScore reading is that 28/36 is no longer "conservative" — it's the new normal, and 31/43 is what we used to call aggressive.
What to do if you're over
- Pay down the back-end first. Every $100/month of credit-card minimums you eliminate unlocks roughly $20K of additional home price at the 36% back-end cap.
- Add a co-borrower. A second income on the application moves the gross monthly figure that anchors the percentages.
- Increase down payment. Crossing 20% removes PMI; crossing 25% on conventional often unlocks a small rate discount; both lower the front-end ratio.
- Switch to a 15-year only if the rate cut clears the higher P&I. 15-year payments are larger, so the front-end usually worsens. Only useful when the rate drop is large enough to offset.
- Buy a less expensive home. The blunt instrument — and the one we recommend before stretching to FHA 43%.
Run the 28/36 math against your numbers
Income, debt, state — three inputs, three DTI bands, full PITI breakdown.
Frequently asked
What is the 28/36 rule in simple terms?+
Your monthly housing payment (principal, interest, taxes, insurance, HOA, PMI) should not exceed 28% of your gross monthly income, and your total monthly debt (housing + cards + auto + student + child support) should not exceed 36%. The first cap is called front-end DTI; the second is back-end DTI. If either is breached, the bank either denies, prices the loan higher, or asks for compensating factors.
Is the 28/36 rule still valid in 2026?+
Yes. With insurance premiums up double-digits in coastal markets and property tax assessments catching up to 2021–2023 price growth, the 28/36 band is closer to the real ceiling for most owners than the lender's 43% QM stretch. Buyers who buy at 28/36 keep the 1% maintenance reserve intact; buyers who stretch to 43%+ rarely do.
What's the difference between front-end and back-end DTI?+
Front-end DTI is housing-only (PITI + HOA + PMI) divided by gross monthly income. Back-end DTI adds every other monthly debt payment on your credit report. The 28 is the front-end cap; the 36 is the back-end cap. The binding constraint — whichever one you hit first — is what actually caps your home price.
What's included in the housing payment for DTI?+
Principal, interest, property tax (1/12 of the annual bill), homeowners insurance, mortgage insurance (PMI on conventional < 20% down, MIP on FHA, funding fee on VA), and HOA dues. Utilities are not counted. Maintenance reserves are not counted by the lender — but should be counted by you.
What if I exceed 28/36 — am I disqualified?+
Not automatically. Conventional loans can stretch to 45% back-end with strong compensating factors (760+ credit, 20%+ down, 6+ months reserves). FHA goes to 43% routinely. The deeper question is not whether the lender will approve you — it's whether the home is affordable. Beyond 36% back-end, the maintenance reserve usually breaks first.
How much income do I need for a $400K home using 28/36?+
Roughly $115,000–$130,000 gross household income, depending on state. PITI on a $400K home at 10% down, 6.75% rate, 30 years, with US-average tax + insurance runs about $3,000–$3,200/mo. The 28% front-end cap requires $10,700–$11,400/mo income (~$128K–$137K annual).
Where did the 28/36 rule come from?+
It originated in conventional underwriting in the 1980s as a benchmark for what households could sustain after taxes, food, transportation, and savings. The thresholds were calibrated around the long-running observation that households spending more than ~36% of gross on debt service tend to have brittle finances — limited capacity for emergencies, repairs, or income shocks.
Does the 28/36 rule apply to renters too?+
Conceptually yes — the 28% front-end cap maps to total monthly rent. The back-end 36% still applies to total debt. But renters have no maintenance reserve obligation and no property tax escalation risk, so the cap is less binding. The rule is most useful for owners and prospective buyers.