What Is a Good Debt-to-Income Ratio and How to Lower It Fast (2026)

Your debt-to-income ratio (DTI) is the single most important number in determining whether you qualify for a mortgage — more important than your savings, more important than your job stability, and in many cases more impactful than your credit score on whether an application gets approved or denied. Yet most people don't know their own DTI or understand exactly what moves it. This guide covers both.

What Is Debt-to-Income Ratio?

DTI is the percentage of your gross monthly income that goes to monthly debt payments. It is calculated as:

Use the debt-to-income calculator to see your exact ratio and loan eligibility by type. If you're looking for a broader picture of how DTI interacts with childcare and other major obligations, the guide to managing major life expenses covers the full budget stack.

Front-End vs. Back-End DTI

Lenders actually calculate two ratios, and both must fall within the limits for your loan program:

• Front-end DTI (housing ratio): your proposed housing payment only — mortgage principal and interest, property tax, homeowners insurance, mortgage insurance (PMI or FHA MIP) and any HOA dues — divided by gross monthly income. The classic guideline is 28% for conventional loans and 31% for FHA.
• Back-end DTI (total debt ratio): that same housing payment plus every other monthly debt obligation, divided by gross income. This is the number that usually decides whether you qualify and for how much. Most conventional loans want it under 43%–45%, and many lenders will approve a slightly high front-end ratio if the back-end ratio is strong.

What Counts (and What Doesn't) in DTI

This is where most buyers get surprised. Lenders count the required monthly payment on each obligation as it appears on your credit report or loan documents, not what you choose to pay.

DTI Thresholds by Loan Type (2026)

The Student Loan DTI Trap

Student loans are where a borrower's real payment and the lender's counted payment most often diverge — especially on an income-driven repayment (IDR) plan or in deferment or forbearance. Each loan program has its own rule:

• Fannie Mae (conventional): uses the payment on your credit report or IDR paperwork — even $0 if it's documented. If no payment is reported (deferment or forbearance), the lender uses 1% of the balance or a fully amortizing payment.
• Freddie Mac (conventional): uses the reported payment if it's above $0; if the payment is $0 or deferred, it counts 0.5% of the balance.
• FHA: uses the actual payment if above $0; otherwise 0.5% of the outstanding balance.

Example: $80,000 of federal student loans. On an IDR plan with a documented $120 payment, all three count $120. Put the same loans in forbearance with no payment reported, and Fannie Mae counts $800 a month while Freddie Mac and FHA count $400. At 6.75%, the $680 gap between $120 and $800 is roughly $100,000 of mortgage you can't borrow. If your loans are paused, getting a documented IDR payment on your credit report before you apply can be worth more than any amount of debt paydown — and it's worth asking lenders which investor's rules they'll underwrite to.

How Lenders Count Your Income

The denominator matters as much as the debts. Lenders use gross (pre-tax) income they can document and expect to continue:

• Salaried and hourly (W-2): current gross pay, verified with pay stubs and W-2s. A documented raise or promotion can count immediately.
• Bonus, overtime and commission: generally averaged over the most recent two years and counted only if the employer indicates it's likely to continue. One-off bonuses don't count.
• Self-employment: the two-year average of net business income from your tax returns, not gross revenue — which is why aggressive deductions can leave a profitable business owner looking income-poor on paper.
• Rental income: typically 75% of gross rent, allowing for vacancy and maintenance. A unit renting for $2,000 a month counts as about $1,500.
• Social Security and other non-taxable income: the non-taxable portion can be "grossed up" (by up to 25% for conventional loans and 15% for FHA) because it isn't reduced by tax. $2,000 a month of fully non-taxable benefits can count as up to $2,500.

How Much Does Each Dollar of Debt Payoff Move Your DTI?

The key insight most people miss: DTI is driven by required monthly payments, not balances. Paying an installment loan down from $12,000 to $6,000 leaves the monthly payment exactly where it was, so DTI doesn't budge. Credit cards are partly different — minimums are usually a percentage of the balance, so a paydown trims the minimum somewhat — but only paying a card to $0 removes the payment entirely. A $4,000 card balance with an $80 minimum, paid to zero, moves your back-end DTI by $80 ÷ gross income.

On a $8,000/month gross income, eliminating an $80 minimum lowers DTI by 1.0 percentage point. This means:

• Eliminating a $150/month car payment improves DTI by 1.9%
• Eliminating a $200/month personal loan improves DTI by 2.5%
• Eliminating a $300/month student loan payment improves DTI by 3.75%

If you need to improve DTI before a mortgage application, focus on paying off debts with the largest minimum-payment-to-balance ratio — typically credit cards and small personal loans — rather than making extra principal payments on large, low-rate loans like student loans.

What That Freed-Up Payment Buys You

When back-end DTI is the limit on your approval, every dollar of monthly debt you eliminate becomes a dollar of mortgage payment you can qualify for. At a 6.75% 30-year rate, each $100 a month of principal and interest supports about $15,400 of loan:

These figures cover principal and interest only; property tax and insurance scale with the price of the home, so the extra purchase price you can afford is somewhat lower. Even so, the $10,000 it might take to clear a $500-a-month car loan can translate into roughly $75,000 of additional borrowing capacity — which is why paying off a car before buying a home often beats the interest-rate math.

Fastest Strategies to Lower DTI

1. Pay off the smallest balance with the highest minimum payment

The "DTI snowball" is different from the financial snowball. The DTI snowball targets debts whose minimum payments are highest relative to balance — often credit cards at minimum payment rates. Paying off a $5,000 card with a $100 minimum drops DTI by more per dollar spent than overpaying on a $50,000 student loan with an $80 minimum IBR payment. Also check how many payments are left on each installment loan: conventional guidelines let lenders leave out an installment debt with 10 or fewer payments remaining (leases excepted), so a small prepayment can take a whole payment out of the calculation.

2. Don't take on new debt in the 6 months before applying

A new car loan that adds $450/month in payments can make the difference between qualifying for a mortgage and not, regardless of your income. Lenders look at your DTI at application time. New credit card balances (even partially paid off) may still show minimum payments on your credit report. Avoid any new debt obligations for 6 months before a major loan application.

3. Time income changes to the application

A salary increase, bonus, or new income source can improve DTI immediately if it's documentable. W-2 income is the easiest — a paycheck stub showing the new rate suffices. Self-employment and freelance income requires 2 years of tax returns to be counted, so plan further ahead for income changes involving non-W-2 sources.

4. Refinance high-payment debts

Refinancing a car loan to a longer term reduces the monthly payment (and therefore DTI) even if the total interest paid increases. This is generally inadvisable from a total-cost perspective but can be legitimate if the reduced monthly payment unlocks a mortgage you couldn't otherwise qualify for — especially if you plan to pay the car off faster anyway.

5. Add a co-borrower

A co-borrower's income joins the denominator. Earning $5,000 a month alone, a 43% back-end limit allows $2,150 of total monthly debt. Add a co-borrower earning $4,000 and the limit on $9,000 of combined income becomes $3,870 — $1,720 a month more, enough to support roughly $250,000 of additional mortgage at today's rates. The catches: the co-borrower's debts come along too, and the loan is priced on the lower of the two applicants' middle credit scores, so a co-borrower at 640 against your 720 raises your rate. Run both versions with a lender before deciding.