Debt-to-income ratio (DTI): How to calculate it and the limits by loan type

Written by Samantha SheltonNMLS 1647301Updated October 2026

Woman at home using a calculator and laptop to work out her debt-to-income ratio before applying for a mortgage

Your debt-to-income ratio (DTI) is all your monthly debt payments divided by your gross monthly income, written as a percentage. Pay $2,000 a month toward debts on $5,000 a month of gross income and your DTI is 40%.¹ That one number tells a lender how much room your paycheck has left for a mortgage payment.

There is no single national cutoff. Your ceiling comes from the loan program: Fannie Mae allows up to 50% through Desktop Underwriter, USDA looks for 41% or less, and FHA publishes hard ratios only for files a human underwrites. The 43% figure people still repeat as federal law was pulled out of the Qualified Mortgage rule years ago.

Learn what counts as debt, how to run your number in two steps, what each loan program allows, and how DTI differs from credit utilization. New to the vocabulary? Start with our Mortgage Basics guide.

Key takeaways:

The formula is one line: Total monthly debt payments divided by gross monthly income, times 100. Debts of $2,000 against $5,000 of gross income is a 40% DTI.
Only recurring obligations count: Fannie Mae names 18 categories of monthly debt obligations, from installment debt to student loans to child support. Groceries, utilities, phone bills and child care are not on the list.
Your ceiling comes from the program, not one national rule: USDA looks for 29% housing and 41% total debt, FHA’s manual limits run from 31/43 to 40/50, and Fannie Mae’s Desktop Underwriter allows up to 50%.

DTI limits by loan type at a glance:

Conventional: Up to 50% with a Fannie Mae Desktop Underwriter approval; 36%, or up to 45% with the required credit score and reserves, when a person underwrites the file.
FHA: 31% housing and 43% total on a manually underwritten loan, rising to 40% and 50% with two compensating factors. A file that earns an “Accept” from HUD’s TOTAL Mortgage Scorecard is not held to those manual tiers.
VA: No maximum. 41% is the point where the underwriter looks harder, and residual income carries the decision.
USDA: 29% housing and 41% total, up to 32% and 44% with a waiver that needs a 680 or higher score and a documented compensating factor.
Jumbo, home equity loans and HELOCs: No agency maximum. Each lender sets its own limit.

What is a debt-to-income ratio (DTI)?

A debt-to-income ratio is the share of your gross monthly income committed to required debt payments. The Consumer Financial Protection Bureau puts it in one sentence: your DTI is all your monthly debt payments divided by your gross monthly income. Read the CFPB’s definition of debt-to-income ratio in full.

DTI = (total monthly debt payments ÷ gross monthly income) × 100

Gross is the word doing the work. Lenders use income before taxes, retirement contributions and health premiums come out, not what lands in your checking account. That’s why the DTI on your approval looks friendlier than the one you calculate against take-home pay.

DTI measures capacity, not history. Your credit score says how reliably you have paid; your DTI says whether the math still works after one more payment. It’s also the qualifying number you can usually move soonest, which is why it comes up early in credit and qualifying conversations.

How do you calculate your debt-to-income ratio?

Two steps get you a number accurate enough to plan around.

Step 1: Add up the monthly payments that count

Fannie Mae’s Selling Guide lists 18 categories of monthly debt obligations that have to be considered in the DTI ratio. Everyday living costs are absent, the biggest reason borrower and lender math disagree.

Counted as monthly debt	Not counted
Rent or the proposed mortgage payment, with taxes and insurance	Groceries, gas, utilities and phone bills
Auto loans and lease payments	Health, auto and life insurance premiums
Student loans, including deferred installment debt	Child care (USDA says it need not be a recurring liability)
Minimum payments on revolving accounts and lines of credit	401(k) contributions, and loans pledging a 401(k) under USDA rules
Home equity lines of credit and installment loans	Open accounts carrying a zero balance
Alimony, child support, garnishments, IRS installment agreements	Gym memberships and other cancellable subscriptions

Two categories move around, and both are lender choices rather than blanket rules. On student loans showing a $0 payment, Fannie Mae lets a lender use 1% of the balance or a fully amortizing payment from the documented terms. On alimony, the lender may instead reduce qualifying income by the payment. Which path your file takes is settled in mortgage underwriting, and the two methods produce different ratios on the same borrower.

Step 2: Divide by your gross monthly income

Use gross monthly income for everyone on the loan: base pay plus overtime, bonus and commission a lender can document as stable and likely to continue. Self-employment differs. Lenders qualify you on net income after business expenses, and Fannie Mae generally requires a two-year earnings history.²

Take the example above: $1,300 rent, a $400 auto payment, a $100 student loan payment and $200 in card minimums total $2,000. Against $5,000 gross, that’s 2,000 ÷ 5,000 = 0.40, or 40%.

Front-end vs. back-end DTI: What’s the difference?

Front-end DTI counts your housing payment alone; back-end DTI counts housing plus every other required debt payment. On $5,000 of gross income with a $1,300 housing payment and $700 of other debts, the front-end ratio is 26%, the back-end 40%.

Front-end (housing) ratio: Principal, interest, taxes, insurance and HOA dues. USDA caps it at 29% of repayment income; FHA sets it at 31% on manually underwritten loans.
Back-end (total debt) ratio: Housing plus auto loans, student loans, card minimums and support obligations. This is what lenders mean by “your DTI.”

The 28/36 rule targets housing at 28% of gross income and total debt at 36%. Treat it as a budgeting benchmark, not a program rule, though the 36% half has a real counterpart: Fannie Mae’s maximum total DTI on a manually underwritten loan is 36%. The other ratio underwriters weigh is your loan-to-value ratio (LTV), which measures the loan against the property instead of against you.

Work out your debt-to-income ratio

Use monthly figures. For debts, use the minimum payment on each statement, not the balance. Nothing you enter is sent anywhere.

Gross monthly income Before taxes. A salary divided by 12, plus other income you can document.

The housing payment you are planning for Principal, interest, property taxes, homeowners insurance, mortgage insurance and association dues. Leave it blank to see your other debts on their own.

Other monthly debt payments

Car loans and leases

Student loans If a statement shows no payment, lenders usually count one calculated from the balance.

Credit card minimum payments

Other loans Personal loans, other mortgages, a home equity line.

Child support or alimony you pay

This is arithmetic on numbers you entered. It is not a quote, an offer, a credit decision or a recommendation, and it does not evaluate your eligibility for any loan program. Program limits change and depend on the whole file. Align Lending LLC, NMLS #2041154. Equal Housing Opportunity.

What is a good DTI ratio? Limits by loan program

A DTI at or below 36% is comfortable almost everywhere, and every major program stretches past it when the rest of your qualifying picture is strong.

Program	Housing ratio	Total DTI	What stretches it
Conventional, automated (Fannie Mae DU)	No separate limit	50% maximum	The DU decision governs the file.
Conventional, manual (Fannie Mae)	No separate limit	36%, up to 45%	45% needs the credit score and reserve minimums in the Eligibility Matrix.
FHA, manually underwritten³	31% to 40%	43% to 50%	31/43 baseline, 37/47 with one compensating factor, 40/50 with two at a 580+ score.
VA⁴	Not used	41% review trigger	Residual income, plus documented compensating factors above 41%.
USDA Guaranteed	29%	41%	A waiver to 32/44 needs a 680+ score and a documented compensating factor.
Jumbo (above the conforming limit)	Set by the lender	Set by the lender	No agency rule applies. Each lender publishes its own ratio and reserve requirements.
Home equity loan or HELOC	Not used	Set by the lender	The new payment counts toward your total DTI along with your first mortgage.

Automated approvals change two of those rows. An FHA file that earns an “Accept” from HUD’s TOTAL Mortgage Scorecard is insured without a manual underwriting review, so the 31/43 and 40/50 tiers govern files a Direct Endorsement underwriter works by hand. USDA is the same: its waiver rules don’t apply to GUS files receiving an Accept.

VA publishes no hard cap. It treats 41% as the point where the underwriter looks harder, and residual income carries the decision. When the ratio runs above 41% and residual income exceeds the VA guideline by at least 20%, no second-level review or written statement of justification is required; when it doesn’t, the underwriter’s supervisor has to justify and sign off on the approval.

About that 43% number. It is out of date as a federal rule. The CFPB’s General Qualified Mortgage final rule removed the 43% DTI limit and replaced it with a price-based test comparing a loan’s APR to the average prime offer rate. The old DTI-based definition applied only to applications received before October 1, 2022. Today 43% survives as an FHA manual-underwriting baseline, not a national ceiling.

DTI vs. credit utilization: What’s the difference?

DTI compares your monthly payments to your income; credit utilization compares your revolving balances to your credit limits. Different inputs, and only one touches your credit score.

Utilization lives in your FICO Score, in the amounts-owed category worth 30%, behind payment history at 35% and ahead of length of credit history at 15%, new credit at 10% and credit mix at 10%. A FICO Score is calculated only from your credit report, which is why income never enters it. Compare the weights at what credit scores actually measure.

The difference shows up when you pay a card down. Dropping a $4,500 balance to $500 on a $5,000 limit can move your score quickly, because utilization falls from 90% to 10%, yet it barely moves DTI because that card’s minimum was small. Retiring a $400 car payment does the reverse: little score effect, an 8-point DTI improvement on $5,000 of income. See what’s a good credit score to buy a house.

How do you lower your DTI before you apply?

Shrink the numerator or grow the denominator. The quickest wins come from small balances carrying large payments.

Pay off the highest payment, not the highest balance: Clearing a $3,000 loan with a $400 monthly payment cuts 8 points off a $5,000-income DTI. Clearing a $9,000 loan with a $150 payment cuts 3.
Leave new debt alone until you close: A car financed during underwriting can add 5 to 10 points of DTI and force a re-approval, and lenders re-pull credit before closing.
Document income you already earn: Overtime, bonus, commission and part-time income can count once you show the history, raising the denominator without changing your spending.

Our walkthrough of how to improve your debt-to-income ratio shows the order to work in, and preapproval rather than prequalification gives you a real read on where you stand. The CFPB’s home-buying tools are a neutral second opinion.

How Align helps when credit is the question

Another lender's no is not always the final answer. Lenders add their own rules on top of the program's, and Samantha can take your file to a wholesale lender whose rules fit it.

If it is not time yet, she will say so and tell you what to work on first. It is also why local real estate agents bring her in for second opinions.

Take a mortgage readiness review

FAQ: Debt-to-income ratio

Here are answers to common questions about debt-to-income ratio.

What is the maximum DTI to qualify for a mortgage?

It depends on the program. Fannie Mae allows up to 50% through Desktop Underwriter and 36% on manually underwritten loans, rising to 45% when the borrower meets the Eligibility Matrix credit score and reserve minimums. USDA looks for 41% or less; FHA’s manual tiers reach 50% with two compensating factors. There is no universal ceiling, which is why one lender can decline a file another approves once underwriting runs.

What is the DTI limit for a USDA loan?

USDA looks for 29% of repayment income for housing and 41% for total debt. A waiver can stretch that to 32% and 44% when the borrower has a 680 or higher credit score and a documented compensating factor. Those waiver rules govern files a person underwrites; a GUS “Accept” is not held to them.

What is the maximum DTI for an FHA loan?

On a manually underwritten FHA loan the baseline is 31% for housing and 43% for total debt. One compensating factor raises that to 37% and 47%, and two raise it to 40% and 50% at a 580 or higher score. A file that earns an “Accept” from HUD’s TOTAL Mortgage Scorecard is insured without a manual review, so those tiers don’t apply to it.

What DTI do you need for a VA loan?

VA sets no maximum DTI. It treats 41% as the point where the underwriter looks harder, and residual income, the money left each month after major expenses, carries the decision. Above 41%, when residual income beats the VA guideline by at least 20%, no extra justification is required.

Does debt-to-income ratio affect your credit score?

No. A FICO Score is calculated only from your credit report, and income isn’t in it. What does affect the score is credit utilization, the share of your revolving limits you’re using, which sits in the amounts-owed category worth 30%. Lenders check the two separately: the score for how you’ve handled credit, DTI for whether you can absorb another payment. Our guide to credit scores for buying a house covers the score side.

What debts are included in the DTI calculation?

Recurring obligations you owe by contract or court order. Fannie Mae’s 18 categories cover alimony and child support, bridge loans, business debt in your name, court-ordered assignment of debt, debts paid by others, non-applicant accounts, deferred installment debt, federal tax installment agreements, garnishments, HELOCs, installment debt, leases, rental housing payments, loans secured by financial assets, open 30-day charge accounts, other real estate owned, revolving accounts and student loans. Groceries, utilities and child care are excluded, and USDA also leaves out 401(k) loans and zero-balance accounts. Trimming the right ones is the core of improving your DTI.

How do lenders calculate DTI for self-employed borrowers?

They use net income after business expenses, not gross receipts. Fannie Mae generally requires a two-year history of prior earnings, with narrow exceptions where the most recent returns show a full 12 months from the current business. Because the write-offs that cut your tax bill also cut your qualifying income, map out your DTI a year or two before applying, and learn the difference between prequalified and preapproved before you shop.

The bottom line on debt-to-income ratio

Your debt-to-income ratio is all your monthly debt payments divided by your gross monthly income: $2,000 of debts against $5,000 of gross income is a 40% DTI. Only the 18 categories Fannie Mae names count; everyday living costs stay out of the math. Below 36% you’re comfortable nearly anywhere. Above it, your program sets the ceiling: Fannie Mae’s 50% through Desktop Underwriter, USDA’s 29/41, FHA’s manual tiers up to 40/50, or VA’s residual income test. The 43% federal limit no longer exists.

If you’re ready to find out which lenders will approve your ratio, talk to Align Lending. We’ll shop your scenario across our lender network and show you side by side which programs give you the most DTI headroom. Call 248-506-5727 or start online today.

Student loan payments are the single most common reason a DTI comes in higher than a borrower expects, and how the payment is counted depends on your repayment plan. Read more on buying a home with student loan debt.

Footnotes:

1. Example figures in this article are hypothetical and for educational purposes only; they do not constitute an advertisement of credit terms or a rate quote under federal or state lending laws. Your qualifying ratios depend on your documented income, your credit report, the loan program and the lender’s underwriting decision. Return to text.

2. This is general information, not tax advice. How business income and deductions affect your qualifying income depends on your returns and your business structure. Consult a qualified tax professional about your situation. Return to text.

3. Align Lending is not acting on behalf of or at the direction of FHA or HUD. FHA maximum qualifying ratios and compensating factors are set by HUD in Single Family Housing Policy Handbook 4000.1 and are subject to change. Return to text.

4. Align Lending works with VA-approved lenders and is not endorsed or sponsored by the Dept. of Veterans Affairs or any government agency. VA credit standards, including residual income requirements, are set by VA and are subject to change. Return to text.

Sources: definition of debt-to-income ratio as all monthly debt payments divided by gross monthly income, Consumer Financial Protection Bureau, Ask CFPB. Maximum allowable DTI of 50% for loan casefiles underwritten through DU, and maximum total DTI of 36% for manually underwritten loans exceedable to 45% with the credit score and reserve requirements in the Eligibility Matrix, Fannie Mae Selling Guide B3-6-02. The 18 categories of monthly debt obligations considered in underwriting and included in the DTI ratio, the lender option to use 1% of the outstanding student loan balance or a fully amortizing payment when the credit report shows $0, and the lender option to reduce qualifying income by an alimony or separate maintenance obligation in lieu of counting it as a monthly payment, Fannie Mae Selling Guide B3-6-05. Two-year history of prior earnings for self-employed borrowers and the 12-month exception, Fannie Mae Selling Guide B3-3.2-01. Maximum qualifying ratios for manually underwritten FHA loans of 31/43, 37/47 with one compensating factor and 40/50 with two, HUD Single Family Housing Policy Handbook 4000.1 II.A.5.d.viii-ix, via the FHA Resource Center. TOTAL Mortgage Scorecard “Accept” insured without a manual underwriting review and “Refer” requiring a Direct Endorsement underwriter, HUD, FHA TOTAL. VA 41% ratio threshold, approval with justification by the underwriter’s supervisor when the ratio exceeds 41%, and the exception from second-level review and the statement of justification where residual income exceeds the guidelines by at least 20 percent, 38 CFR § 36.4340(c); VA Lender’s Handbook M26-7, Chapter 4. USDA PITI ratio of 29% and total debt ratio of 41% of repayment income, debt ratio waivers to 32% PITI and 44% total debt with a 680 credit score and a documented compensating factor, exclusion of child care expenses, 401(k) and personal asset loans and zero-balance open accounts, and the inapplicability of waiver requirements to GUS files receiving an Accept, USDA HB-1-3555 Chapter 11, Ratio Analysis. Removal of the General QM 43% DTI limit, its replacement with a price-based threshold, and the October 1, 2022 mandatory compliance date, Consumer Financial Protection Bureau, General QM Loan Definition final rule. FICO Score category weights of 35%, 30%, 15%, 10% and 10%, and that the score is calculated only from credit report information, myFICO.