You can buy a house while carrying debt, and most mortgage borrowers do. When you’re buying a house with debt, lenders don’t disqualify you for owing money — they measure whether your monthly obligations leave enough room for a mortgage payment. That measurement is your debt-to-income ratio, and depending on the loan program, you can qualify with a DTI as high as 50% while still paying student loans, a car note, or credit cards.
What Lenders Are Actually Measuring
Your debt-to-income ratio compares your monthly debt payments to your gross monthly income. Lenders look at two versions.
The front-end ratio, sometimes called the housing ratio, is the percentage of your gross monthly income that would go to housing costs alone: mortgage principal and interest, property taxes, homeowners insurance, mortgage insurance, and any HOA fees. The back-end ratio adds every other monthly debt payment on top of that housing figure.
When a loan program advertises a “DTI limit,” it almost always means the back-end ratio. Some programs also set a separate front-end cap — FHA uses 31% and USDA uses 29%.1USDA. Ratio Analysis
Which Debts Count
Lenders count fixed and recurring obligations that appear on your credit report or in court records:
- Installment loans: monthly payments on car loans, student loans, personal loans, and timeshares.
- Revolving debt: the minimum monthly payment on each credit card, not the total balance.
- Court-ordered obligations: child support and alimony pulled from legal agreements or pay stubs.
- Existing mortgages: payments on any other properties you own, including taxes and insurance on those properties.
Everyday living costs don’t count. Groceries, utilities, car insurance, cell phone bills, and streaming subscriptions stay out of the calculation. Lenders only look at debts where you have a contractual repayment obligation.
How to Calculate Your DTI
Start with your gross monthly income, the amount you earn before taxes and deductions. Pull it from a recent pay stub or divide your annual salary by 12. If you earn variable income from bonuses, overtime, or self-employment, lenders typically average it over the past two years.
Add up every monthly debt payment in the categories above. Skip rent if you plan to leave your current home, but include it if you’ll keep paying rent on another property after closing.
Divide total monthly debts by gross monthly income. If your debts total $1,800 and your gross income is $6,000, your current back-end DTI is 30%. Now project what happens with the mortgage. If the new payment including taxes and insurance would add $1,400, your projected back-end DTI becomes ($1,800 + $1,400) ÷ $6,000, or 53.3% — above most program limits.
DTI and Credit Score Limits by Program
Each major mortgage program sets its own ceiling. These are the maximums the program allows; individual lenders often set tighter standards, so if one turns you down, another may not.
FHA Loans
FHA loans are aimed at borrowers with moderate credit and limited down payment funds. Standard DTI limits are 31% front-end and 43% back-end. With compensating factors — cash reserves equal to three or more months of housing payments, a minimal increase over your current housing cost, or significant additional income not used in qualifying — you can be approved with a back-end DTI as high as 50%.2eCFR. 24 CFR Part 203 Single Family Mortgage Insurance The minimum down payment is 3.5% with a credit score of 580 or higher. Scores between 500 and 579 still qualify but require 10% down.
Conventional Loans
Conventional loans backed by Fannie Mae or Freddie Mac offer the widest DTI range. Loans processed through Fannie Mae’s Desktop Underwriter automated system can be approved with a DTI up to 50%.3Fannie Mae. Debt-to-Income Ratios Manually underwritten loans cap at 36%, stretchable to 45% with higher credit scores and reserves.4Fannie Mae. Eligibility Matrix Most conventional loans require a minimum credit score of 620 for fixed-rate products.5Fannie Mae. General Requirements for Credit Scores Down payments start at 3% to 5%, though anything under 20% triggers private mortgage insurance.
VA Loans
VA loans for veterans and active-duty service members use 41% as a guideline rather than a hard cap.6Department of Veterans Affairs. Debt-To-Income Ratio: Does It Make Any Difference to VA Loans? If your DTI exceeds 41%, the underwriter checks your residual income, the cash left each month after debts and estimated living costs. If your residual income exceeds the VA’s regional threshold by roughly 20%, you can still be approved. The VA itself sets no minimum credit score, though most lenders require around 620.7Veterans Benefits Administration. VA Home Loan Guaranty Buyer’s Guide No down payment is required for most borrowers.
USDA Loans
USDA Rural Development loans use 29% front-end and 41% back-end as standard limits, with manual underwriting waivers allowing 32% and 44%.1USDA. Ratio Analysis USDA loans offer zero-down financing but are restricted to buyers who meet income caps and purchase in designated rural or suburban areas.
Debts You May Be Able to Exclude
Several situations let you leave debts out of your DTI, or count them at a reduced amount.
Student Loans on Income-Driven Repayment
If your income-driven repayment plan has reduced your monthly student loan payment to $0, Fannie Mae allows the lender to qualify you at that $0 figure, provided loan documentation confirms it.8Fannie Mae. Monthly Debt Obligations If your credit report shows no monthly payment at all, the lender must use one of several alternative methods to calculate a qualifying amount. Each program handles student loans slightly differently, so ask your lender which documentation they need.
Installment Loans Nearly Paid Off
For conventional loans backed by Fannie Mae, an installment debt with fewer than ten monthly payments left can be excluded from your DTI, unless the payment is large enough to significantly affect your ability to handle the mortgage.8Fannie Mae. Monthly Debt Obligations USDA follows a similar rule when ten or fewer payments remain and the payment doesn’t exceed 5% of your monthly income.9USDA. HB-1-3555, Chapter 11 – Ratio Analysis A small car payment with a few months left can often be paid off before applying to improve your ratio.
Co-Signed Debt
A debt you co-signed normally counts against your DTI even if someone else pays it. You may be able to exclude it by documenting that the primary borrower has made every payment on time for the previous 12 months.10Consumer Financial Protection Bureau. Appendix Q to Part 1026 – Standards for Determining Monthly Debt and Income Bank statements or canceled checks from the other borrower’s account showing 12 consecutive payments are the usual proof.
Business Debt for the Self-Employed
If a business debt appears on your personal credit report, it can be excluded when you show the debt is paid through a business account. Lenders typically require 12 months of business bank statements or canceled checks.9USDA. HB-1-3555, Chapter 11 – Ratio Analysis
Lowering Your DTI Before You Apply
If your ratio is above your target program’s limit, you have two levers: reduce monthly debt payments or increase qualifying income.
- Pay down revolving debt first. Credit card balances drive your minimum payments directly, and minimums recalculate quickly as balances drop. Eliminating a $5,000 balance might remove a $150 monthly minimum from your DTI.
- Pay off small installment loans. Anything with fewer than ten payments left can drop off entirely under conventional and USDA rules.
- Don’t open new accounts. New credit inquiries and new debts raise underwriting flags. Hold off on financing furniture, appliances, or a vehicle.
- Increase qualifying income. A raise, promotion, or documented part-time income shown on tax returns lowers your ratio. Lenders usually need a two-year history to count supplemental income.
- Add a co-borrower. A spouse or partner’s income boosts the denominator, but their debts get added too. This only helps if their income-to-debt profile is favorable.
Don’t Take On New Debt During Underwriting
Once your application is in, the lender keeps watching. Many use an undisclosed-debt monitoring service that checks all three credit bureaus continuously from application through closing.11Fannie Mae. Undisclosed Liabilities – Attacking This Common Defect Lenders that don’t use monitoring often pull a fresh credit report within three days of closing to catch last-minute changes. If new debt shows up, the lender must recalculate your DTI, and an approval can be revoked if the new ratio exceeds program limits.
At closing you’ll typically sign a certification confirming you haven’t taken on new debt since applying. Financing a car, opening a store credit card, or co-signing a loan for someone else in this window is one of the most common reasons mortgage approvals fall through at the last minute.