Your credit score shows how you have handled debt in the past. Your debt-to-income ratio shows whether you can afford new debt today. For mortgages especially, DTI is often the factor that determines how much you can borrow, or whether you are approved at all. This guide explains how DTI is calculated, what lenders consider acceptable, and how to improve your ratio before you apply.
What DTI measures
Debt-to-income ratio compares your monthly debt payments with your gross monthly income, meaning income before taxes and deductions.
Monthly debt payments ÷ gross monthly income × 100 = DTI
If you earn $6,000 a month before taxes and pay $2,100 toward debts, your DTI is 35%.
Front-end and back-end ratios
Mortgage lenders often look at two versions:
- Front-end ratio (housing ratio): Only your proposed housing payment, including principal, interest, property taxes, homeowners insurance, mortgage insurance, and HOA dues, divided by gross income.
- Back-end ratio: Your housing payment plus all other recurring debt payments divided by gross income. When people talk about DTI, they usually mean the back-end ratio.
What counts as debt
Lenders include recurring obligations that appear on your credit report or in your application:
- The proposed mortgage payment, or current rent is not counted once you buy
- Auto loans and leases
- Student loans, including those in deferment, using a calculated payment if none is reported
- Minimum credit card payments
- Personal loans and installment loans
- Child support and alimony payments
- Co-signed loans, unless you can prove someone else makes the payments
Lenders generally do not count utilities, phone bills, groceries, insurance premiums other than homeowners insurance, or subscriptions.
Student loan payments in DTI
Student loans often surprise borrowers. If you are on an income-driven plan with a $0 payment, or your loans are deferred, lenders follow program rules to estimate a payment. Some programs allow a documented income-driven payment to be used, while others require a percentage of the balance. Ask your loan officer how your loans will be counted.
What counts as income
Lenders use stable, verifiable gross income, such as:
- Salary and hourly wages, typically verified with pay stubs and W-2s
- Overtime, bonuses, and commissions with a history, often two years
- Self-employment income, averaged from tax returns
- Social Security, pension, and disability benefits
- Alimony or child support received, if it will continue for a set time
- Rental income, under specific rules
Non-taxable income, such as some Social Security benefits, may be “grossed up” to account for its tax-free status.
Typical DTI limits by loan type
Limits depend on the program and on compensating factors such as credit score and cash reserves. As general guidelines:
| Loan type | Common back-end DTI guideline |
|---|---|
| Conventional | Up to about 45%, sometimes 50% with automated underwriting approval |
| FHA | Often 43%, with approvals above 50% possible with strong compensating factors |
| VA | 41% benchmark, but residual income also matters |
| USDA | 41% back-end and 29% front-end benchmarks |
The Consumer Financial Protection Bureau’s ability-to-repay rule requires lenders to make a reasonable, good-faith determination that you can repay. While the original Qualified Mortgage rule used a strict 43% DTI cap, the CFPB replaced it with a price-based standard in 2021, so lenders now have more flexibility but still weigh DTI heavily.
Why DTI matters beyond approval
A lower DTI can improve your loan terms, make it easier to qualify for a higher loan amount, and give you breathing room in your budget. Even if a lender approves you at 45%, that may feel tight after taxes, retirement savings, and everyday expenses. Many households set a lower personal target.
How to calculate your own DTI
- Add up your gross monthly income from all reliable sources.
- List each monthly debt payment from your credit report and loan statements.
- Estimate your future housing payment, including taxes and insurance.
- Divide total debts by gross income.
Doing this before you shop for homes helps you set a realistic price range.
Ways to lower your DTI
Pay down or pay off debts
Paying off a loan with only a few payments left removes the full payment from your DTI. Paying down credit cards lowers minimum payments. Ask your lender which debts give the biggest improvement.
Avoid new debt
Do not open new credit cards, finance a car, or buy furniture on credit before or during the mortgage process. New payments can push your DTI above the limit.
Increase documented income
A raise, a second job, or a co-borrower’s income can help, but lenders usually want a history. Income from a new side gig may not count until it has a track record.
Choose a lower housing payment
A smaller loan, larger down payment, lower property taxes, or a home without HOA dues lowers the front-end ratio. Comparing homeowners insurance quotes also helps.
Consider refinancing other debt
Refinancing a car loan or consolidating credit card debt into a lower monthly payment may reduce DTI, though stretching terms increases total interest. Time any new loan carefully so the hard inquiry does not affect your mortgage application.
DTI vs credit utilization
DTI compares payments to income. Credit utilization compares card balances to credit limits. You can have low utilization and high DTI, or the reverse. Both matter, but in different ways: utilization affects your credit score, while DTI is part of the lender’s underwriting decision and does not appear in your credit score.
A worked example of front-end and back-end DTI
Consider a household earning $96,000 a year, or $8,000 a month before taxes. They are shopping for a home with an estimated payment of $2,240 a month including principal, interest, property taxes, homeowners insurance, and mortgage insurance. Their other debts include a $410 car payment, a $260 student loan payment, and $90 in credit card minimums.
Their front-end ratio is $2,240 divided by $8,000, or 28%. Their back-end ratio adds the other debts: $2,240 plus $760 equals $3,000, divided by $8,000, or 37.5%. That is within the guidelines of most loan programs. If the same household also financed new furniture with a $250 monthly payment just before closing, the back-end ratio would rise to about 40.6%, which might still pass but could change their pricing or require additional documentation.
Now suppose they pay off the car loan with savings, leaving enough for the down payment and closing costs. Their back-end DTI drops to about 32.4%. That gives them more room in their budget and could help them qualify for a slightly higher loan amount if they need it. Running scenarios like this with a loan officer before you make an offer shows which changes produce the biggest improvement, and it helps you avoid moves that look helpful but drain the cash reserves lenders also want to see.
Related reading: How a HELOC Works: Draw Periods, Variable Rates, and Smart Ways to Use Home Equity.
Frequently Asked Questions
What is a good debt-to-income ratio?
Many lenders prefer a back-end DTI of 36% or less, while some loan programs allow 43% to 50% with strong compensating factors. Lower is generally better.
Does rent count in my DTI for a mortgage?
Your current rent is not included once the new mortgage payment replaces it. Instead, the lender counts the proposed housing payment.
Is DTI based on gross or net income?
Lenders use gross monthly income, before taxes and payroll deductions.
Does DTI affect my credit score?
No. Credit bureaus do not track income, so DTI is not part of your credit score, but lenders use it in underwriting.
How quickly can I lower my DTI?
Paying off a small loan or a credit card can lower DTI as soon as the lender sees the updated balance, often within one statement cycle.
Do lenders count a co-signed loan in my DTI?
Usually yes, because you are legally responsible for the debt. Many lenders will exclude it if you can document, typically with 12 months of bank statements, that the other borrower has made every payment on time from their own account.
This article is for general informational purposes only and is not legal, medical, tax, or financial advice. Rules vary by state and change over time; confirm details with the relevant agency or a licensed professional.
