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Direct answer: Lenders often look at your debt-to-income ratio: total monthly debts divided by gross monthly income. Fannie Mae caps manual underwriting at 36% (up to 45% with its Eligibility Matrix) and Desktop Underwriter at 50%. FHA's published manual ratios start at 31%/43%; VA's DTI guide is 41%, with residual income primary.
By the numbers: Fannie Mae: manual max total DTI 36%, up to 45% with Eligibility Matrix credit and reserves, DU max 50%. FHA Handbook 4000.1 manual matrix: 31/43 standard (580+), up to 40/50 with two compensating factors. VA: 41% DTI guide (38 CFR 36.4340). Example rate: 30-year 7.40% week of 2026-10-15 (Freddie Mac). Source: Fannie Mae B3-6-02; HUD Handbook 4000.1; 38 CFR 36.4340; Freddie Mac PMMS
“Your debt-to-income ratio (DTI) is all your monthly debt payments divided by your gross monthly income. This number is one way lenders measure your ability to manage the monthly payments to repay the money you plan to borrow.” — CFPB, What is a debt-to-income ratio?
Updated 2026-10-17
A common lender screen is debt-to-income (DTI): housing plus other monthly debts, divided by gross monthly income. Plug your income, other debts, down payment, and a published DTI preset into the calculator above for an approximate max payment and home price. How much you can comfortably afford may be lower (CFPB).
It depends on the loan program. Fannie Mae's Selling Guide sets manual underwriting at a 36% maximum total DTI (up to 45% with matrix credit/reserves) and DU at 50%. FHA's published manual matrix starts at 31% housing / 43% total. VA uses a 41% DTI guide alongside residual income. Lenders can be stricter.
For manually underwritten loans, Fannie Mae's maximum total DTI is 36% of stable monthly income, and it can go up to 45% if you meet the Eligibility Matrix credit score and reserve requirements. For Desktop Underwriter (DU) casefiles, the maximum allowable DTI is 50% (Selling Guide B3-6-02).
HUD Handbook 4000.1's manual underwriting matrix: 31% mortgage-payment-to-income and 43% total fixed-payment-to-income are the standard ratios for a Minimum Decision Credit Score of 580 or higher. With compensating factors, manual ratios can reach 37/47 or 40/50. TOTAL Scorecard Accept recommendations do not require documented compensating factors even when ratios exceed the benchmarks.
VA's regulation uses a 41% debt-to-income ratio as a guide, not an automatic deny. Residual income (money left after debts for family support) is the primary measure. A DTI over 41% needs close scrutiny and usually a supervisor's written justification unless residual income exceeds the guideline by at least 20% (38 CFR 36.4340).
Not necessarily. The CFPB notes that lenders tell you how much they are willing to lend, which can differ from what fits your budget after other expenses, savings goals, and future payment changes. Include taxes, insurance, and maintenance when you check.
The default is Freddie Mac's national weekly average (7.40% 30-year / 6.71% 15-year for the week of 2026-10-15). Your rate depends on credit, down payment, points, and the lender. Check VaultRubric's mortgage-rates page and get Loan Estimates — this page is not a rate quote.
As of Oct. 17, 2026
Start with published DTI caps, then check your real budget. Fannie Mae, FHA, and VA publish debt-to-income limits lenders use when underwriting. The calculator turns those caps into an approximate max housing payment and home price with your income, other debts, down payment, and an example rate. Qualifying and affording are not the same.
The math:
Sources: Fannie Mae B3-6-02 · HUD Handbook 4000.1 · 38 CFR 36.4340 · CFPB: afford a home
A best fit for the situation described, not financial advice or a buy/sell recommendation. Partner links never change a pick.
Uses published debt-to-income caps from Fannie Mae, FHA (HUD Handbook 4000.1), and VA (38 CFR 36.4340). Example rate default: Freddie Mac 30-year 7.40% / 15-year 6.71% (week of 2026-10-15) — see mortgage rates. Nothing you type leaves your phone.
| Program | Front-end (housing) | Back-end (total DTI) | Notes |
|---|---|---|---|
| Fannie Mae manual underwriting (36%) | — | 36% | Maximum total DTI for manually underwritten loans. |
| Fannie Mae manual with Eligibility Matrix (up to 45%) | — | 45% | Manual underwriting may exceed 36% up to 45% if the borrower meets the credit score and reserve requirements in the Fannie Mae Eligibility Matrix. |
| Fannie Mae Desktop Underwriter (DU) (50%) | — | 50% | Maximum allowable DTI for loan casefiles underwritten through DU. |
| FHA manual underwriting (31% / 43%) | 31% | 43% | Handbook 4000.1 standard manual ratios for Minimum Decision Credit Score 580 and above (no compensating factors required). Borrowers with score 500-579 or no score may not exceed 31/43. |
| FHA manual with 1 compensating factor (37% / 47%) | 37% | 47% | Score 580+: one of verified cash reserves, minimal housing-payment increase, or residual income. |
| FHA manual with 2 compensating factors (40% / 50%) | 40% | 50% | Score 580+: two of reserves, minimal housing-payment increase, significant additional income not in Effective Income, and/or residual income. Absolute maximum in the published manual matrix. |
| VA debt-to-income guide (41%) | — | 41% | 38 CFR 36.4340: DTI standard is 41% or less. Residual income is the primary underwriting measure; a ratio over 41% needs close scrutiny and usually supervisor justification unless residual income exceeds the guideline by at least 20%. |
Front-end = housing payment ÷ gross income when the program publishes one (FHA). Back-end = housing + other monthly debts ÷ gross income. Sources: Fannie Mae B3-6-02 · HUD Handbook 4000.1 · 38 CFR 36.4340. Lenders may set lower internal limits.
Not mortgage or financial advice. These are published DTI limits and arithmetic from the sources dated below. Your lender's overlays, credit, reserves, property, and residual income (for VA) decide what you can actually borrow. We don't recommend lenders or guarantee rates.
A common lender screen is debt-to-income (DTI): housing plus other monthly debts, divided by gross monthly income. Plug your income, other debts, down payment, and a published DTI preset into the calculator above for an approximate max payment and home price. How much you can comfortably afford may be lower (CFPB).
It depends on the loan program. Fannie Mae's Selling Guide sets manual underwriting at a 36% maximum total DTI (up to 45% with matrix credit/reserves) and DU at 50%. FHA's published manual matrix starts at 31% housing / 43% total. VA uses a 41% DTI guide alongside residual income. Lenders can be stricter.
For manually underwritten loans, Fannie Mae's maximum total DTI is 36% of stable monthly income, and it can go up to 45% if you meet the Eligibility Matrix credit score and reserve requirements. For Desktop Underwriter (DU) casefiles, the maximum allowable DTI is 50% (Selling Guide B3-6-02).
HUD Handbook 4000.1's manual underwriting matrix: 31% mortgage-payment-to-income and 43% total fixed-payment-to-income are the standard ratios for a Minimum Decision Credit Score of 580 or higher. With compensating factors, manual ratios can reach 37/47 or 40/50. TOTAL Scorecard Accept recommendations do not require documented compensating factors even when ratios exceed the benchmarks.
VA's regulation uses a 41% debt-to-income ratio as a guide, not an automatic deny. Residual income (money left after debts for family support) is the primary measure. A DTI over 41% needs close scrutiny and usually a supervisor's written justification unless residual income exceeds the guideline by at least 20% (38 CFR 36.4340).
Not necessarily. The CFPB notes that lenders tell you how much they are willing to lend, which can differ from what fits your budget after other expenses, savings goals, and future payment changes. Include taxes, insurance, and maintenance when you check.
The default is Freddie Mac's national weekly average (7.40% 30-year / 6.71% 15-year for the week of 2026-10-15). Your rate depends on credit, down payment, points, and the lender. Check VaultRubric's mortgage-rates page and get Loan Estimates — this page is not a rate quote.
Estimates, not financial advice. Taxes, insurance, PMI and fees vary by lender, county and city; confirm with your lender, dealer and state agency before acting.