FHA loan DTI requirements set two ceilings: your housing payment can’t exceed 31% of your gross monthly income (the front-end ratio), and your total monthly debt payments can’t exceed 43% (the back-end ratio). Those are the baseline caps for a manually underwritten loan. With documented compensating factors, the back-end can stretch to 50%, and loans run through FHA’s automated underwriting system regularly approve well above that when the rest of the file is strong.
How the Two Ratios Are Calculated
Debt-to-income is simple division: monthly debt divided by gross monthly income before taxes. FHA runs the math twice.
The front-end ratio uses only your total monthly housing payment. That’s more than principal and interest. FHA includes property taxes, homeowners insurance, flood insurance where applicable, the monthly mortgage insurance premium, HOA or condo dues, ground rent, special assessments, and payments on any secondary financing against the property.1U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1 MIP and HOA fees are the pieces buyers most often leave out of their own estimates.
The back-end ratio takes that entire housing payment and adds every other recurring monthly obligation: car loans, credit card minimums, student loans, personal loans, alimony, child support, and any other debts reported on your credit. Divide the total by the same gross monthly income. Earn $6,000 a month, carry a $1,500 housing payment and $600 in other debts, and your ratios are 25% front-end and 35% back-end.
Standard DTI Limits for Manual Underwriting
On a manually underwritten loan, FHA starts at 31% front-end and 43% back-end. Those baselines come from HUD Handbook 4000.1 and apply when a borrower brings no additional strengths to the file.2U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1
Mortgagee Letter 2014-02 opens up higher ratios when a borrower with a credit score of 580 or above documents compensating factors:3U.S. Department of Housing and Urban Development. Mortgagee Letter 2014-02 – Manual Underwriting
- No compensating factors: 31% / 43%
- One compensating factor: 37% / 47%
- Two compensating factors: 40% / 50%
Credit scores between 500 and 579 are stuck at the 31/43 baseline no matter what, and those borrowers also need 10% down instead of the usual 3.5%.4U.S. Department of Housing and Urban Development. Does FHA Require a Minimum Credit Score and How Is It Determined Below 500, FHA won’t insure the loan at all.
How Automated Underwriting Changes the Numbers
Most FHA loans don’t go through manual underwriting. They run through the TOTAL Mortgage Scorecard, which weighs DTI alongside credit history, reserves, loan-to-value, and other risk factors, then returns either an Approve or a Refer.5U.S. Department of Housing and Urban Development. FHA TOTAL Mortgage Scorecard
A borrower with strong credit and healthy reserves can pull an automated approval with a back-end ratio well above 50%. Someone with thinner credit may get referred to manual underwriting even at 43%. If TOTAL issues a Refer, the loan either gets denied or moves into manual review under the stricter matrix above. This is where most of the real DTI flexibility on FHA loans actually lives.
Which Debts Count
Lenders have to include every monthly obligation on your credit report, plus certain other documented liabilities:
- Credit card minimums as reported, not the full balance
- Auto loans and personal loans at their fixed installment amount
- Student loans at the monthly payment on the credit report, or, if the report shows zero because of deferment or forbearance, 0.5% of the outstanding balance6U.S. Department of Housing and Urban Development. Mortgagee Letter 2021-13 – Student Loan Payment Calculation of Monthly Obligation
- Court-ordered alimony and child support7U.S. Department of Housing and Urban Development. HUD 4155.1 Mortgage Credit Analysis – Section E Non-Employment Related Borrower Income
The student loan rule catches people off guard. A $60,000 balance sitting in deferment adds $300 a month to your DTI even when you aren’t writing a check. Everyday expenses like groceries, utilities, cell phone bills, and streaming services stay out of the calculation; FHA is looking at formal debt, not household spending.
Which Debts Can Be Excluded
Not everything on your credit report has to weigh on your ratio. FHA allows exclusions in a few defined situations.
Installment debts with ten or fewer payments remaining can be dropped, but only if the combined payments on all such debts add up to 5% or less of your gross monthly income. You can’t pay a balance down specifically to reach the ten-month mark; the debt has to get there on its own.2U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1
Alimony and child support follow the same ten-month rule. If the obligation ends within ten months, the lender can leave it out.8U.S. Department of Housing and Urban Development. Mortgagee Letter 2013-24
Business debt that shows up on your personal credit can also be excluded if you document that the business makes the payments and that the debt was already accounted for in the cash flow analysis on the business’s tax return.2U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1
Which Income Counts
The denominator matters as much as the numerator. FHA accepts several income types, each with its own stability test.
Full-time wages are the simplest. Part-time income counts if you’ve held the job continuously for at least two years and it’s likely to continue. Self-employed borrowers must provide complete individual federal tax returns for the past two years, with all schedules, so the lender can verify consistent business income.9U.S. Department of Housing and Urban Development. Mortgagee Letter 2022-09 – Calculating Effective Income
Overtime, bonus, and tip income can be included with a two-year history, or one year plus documentation that it’s likely to continue. The qualifying figure is the lesser of the two-year average or the one-year average, so declining bonuses pull your effective income down.9U.S. Department of Housing and Urban Development. Mortgagee Letter 2022-09 – Calculating Effective Income Commission income needs at least one year in the same or similar line of work, calculated the same way.
Social Security, pension, and disability income all qualify. If any portion of disability income has an expiration date within three years of the application, though, it can’t be counted as effective income. Income expected to continue beyond that window qualifies normally.
Rental Income Takes a 25% Haircut
Buying a two-to-four-unit property or a home with an accessory dwelling unit lets you count projected rental income, but the lender uses only 75% of either the fair market rent from the appraisal or the amount on an existing lease, whichever is lower.2U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1 The 25% reduction covers vacancy and maintenance. The same rule applies to rent from investment properties you already own.
Grossing Up Non-Taxable Income
This is one of the more underused tools for improving your DTI. Non-taxable income, like Social Security disability, certain VA benefits, or tax-exempt pension income, can be “grossed up” by adding a percentage that reflects the taxes you don’t pay. The higher figure becomes your qualifying income without changing your actual debt.7U.S. Department of Housing and Urban Development. HUD 4155.1 Mortgage Credit Analysis – Section E Non-Employment Related Borrower Income
The lender applies the same tax rate from your most recent return. If you aren’t required to file, the default gross-up is 25%. So $2,000 a month in non-taxable disability income becomes $2,500 in qualifying income at a 25% rate. That extra $500 can meaningfully shift both ratios.
Compensating Factors That Unlock Higher Ratios
On a manually underwritten loan, compensating factors are how you get past 31/43. Each documented factor moves you up a tier on the matrix:3U.S. Department of Housing and Urban Development. Mortgagee Letter 2014-02 – Manual Underwriting
- Verified cash reserves equal to at least three months of total mortgage payments on a one- or two-unit property, or six months on a three- or four-unit property.
- A minimal payment increase: your new mortgage payment is no more than $100 or 5% higher than your previous verified housing payment, whichever is less, and you have a twelve-month history of on-time housing payments with no more than one 30-day late.
- Residual income at or above the amount specified for your household size and region in the VA residual income tables.10U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1
- Significant additional income that doesn’t otherwise qualify as effective income, such as part-time work verified for more than one year but less than two, available as a second compensating factor.
The minimal payment increase factor is the most commonly misread. The “$100 or 5%” test uses the smaller number, not the borrower’s choice. Someone paying $1,800 in rent moving to an $1,880 mortgage sees an $80 increase, which is under both $100 and the $90 that 5% would allow, so it clears. But the clean twelve-month housing history has to be there. Living rent-free with family takes this factor off the table.
Residual income measures something DTI doesn’t: how much cash you actually have left every month for food, transportation, and other living costs. FHA uses the VA’s tables, which vary by household size and region. To calculate it, the lender subtracts federal and state taxes, Social Security, all fixed debts, estimated maintenance and utilities, and job-related expenses like childcare from gross income.10U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1
Don’t Forget MIP in Your Own DTI Estimate
Every FHA loan carries two mortgage insurance premiums: an upfront charge of 1.75% of the base loan amount (usually rolled into the loan) and an annual premium divided into twelve monthly payments and added to your housing costs.1U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook 4000.1
The annual rate depends on your loan amount, term, and loan-to-value. For a standard 30-year loan above 95% LTV at or below the $726,200 base loan amount, the annual rate is 0.55%. On a $300,000 loan, that’s roughly $138 a month added to the front-end ratio. Because MIP is part of the total mortgage payment FHA uses for both ratios, leaving it out of your early math is how borrowers convince themselves they qualify when they don’t.
For most buyers putting down the minimum 3.5%, that annual premium stays on the loan for its full life. Put down 10% or more and it drops off after eleven years. Either way, include it before you start shopping.