Debt-to-Income (DTI) Calculator

Your debt-to-income ratio (DTI) is one of the first numbers a mortgage lender checks. It compares what you owe each month to what you earn, and it tells a lender how much room you have in your budget to take on a mortgage payment. A lower DTI generally means a stronger application; a higher DTI can mean a smaller loan, a higher rate, or a decline.

This calculator estimates your DTI from the debts and income you enter. It does not pull your credit, and it is not a loan approval — think of it as a quick self-check before you talk to a lender. Below, we explain exactly how the math works, what ratios lenders actually look for by loan type, and practical ways to move your number in the right direction. Every threshold we cite links to a primary or lender source so you can verify it yourself.

How this calculator works

DTI is a simple ratio:

DTI = total monthly debt payments ÷ gross monthly income

• Gross monthly income is your income before taxes and deductions. If you are paid annually, divide by 12. Include steady, documentable income (salary, verifiable self-employment, some bonus/overtime, and qualifying alimony or child support).
• Total monthly debt payments are the recurring obligations that show on your credit report or that a lender must count: the proposed mortgage payment (principal, interest, taxes, insurance, and any HOA — “PITIA”), plus car loans, student loans, minimum credit card payments, personal loans, and court-ordered payments.

Lenders actually look at two ratios:

• Front-end (housing) ratio — just your proposed housing payment ÷ gross monthly income.
• Back-end ratio — all monthly debt (housing + every other obligation) ÷ gross monthly income. This is the number most people mean by “DTI,” and it is usually the binding constraint.

Costs that are not counted as debt include utilities, groceries, phone and streaming bills, insurance premiums paid out of pocket, and taxes withheld. They matter for your budget, but they typically do not appear in DTI.

What DTI lenders want to see

There is no single national DTI limit — the ceiling depends on the loan program and, increasingly, on the lender’s automated underwriting decision. General guidance below is current as of July 2026; confirm your specific scenario with a lender, since overlays vary.

• Conventional (Fannie Mae / Freddie Mac): commonly approved up to roughly 45% back-end, and stretching to about 50% when the loan receives an automated approval (Desktop Underwriter / Loan Product Advisor) with strong compensating factors like reserves and higher credit scores. (as of July 2026) — source: Zeitro, Max DTI for Mortgage by Loan Type, 2026
• FHA: benchmark ratios are about 31% front-end / 43% back-end, but with documented compensating factors and an automated approval, back-end DTI can go higher — up to roughly 50%, and in some files approaching ~56.9–57%. (as of July 2026) — sources: FHA Handbook, Debt-to-Income Ratio Requirements 2026; Rocket Mortgage, FHA DTI Ratio Requirements
• The 43% QM/ATR benchmark: 43% back-end DTI is a widely cited rule of thumb because it was tied to the old “Qualified Mortgage” (QM) safe harbor under the Ability-to-Repay (ATR) rule. Note: the CFPB replaced the strict 43% DTI cap with a price-based General QM test (effective for applications from October 2022), so 43% is now a conservative guidepost rather than a hard legal ceiling. (as of July 2026) — source: Zeitro, Max DTI for Mortgage by Loan Type, 2026

Rule of thumb: at 36% or below you have broad options; 37–43% is comfortable for most programs; 44–50% is often still approvable with compensating factors and the right program; above 50% narrows your choices significantly.

How to lower your DTI

DTI has two levers — the debt on top and the income on the bottom. In the months before you apply:

• Pay down revolving balances. Lenders count the minimum payment on cards, so reducing or paying off a card removes that payment from your back-end ratio. Target cards with the highest minimums first.
• Avoid new debt. A new car loan or financed furniture right before applying can add a payment that pushes you over a threshold. Hold off on big purchases until after closing.
• Pay off a nearly finished loan. If an installment loan has only a few payments left (many lenders can exclude a debt with roughly 10 or fewer months remaining), paying it off or documenting the remaining term can drop it out of the calculation. Confirm the exact rule with your lender.
• Document all qualifying income. Bonus, overtime, part-time, or side income that you can prove with a history may count. So can a co-borrower’s income — though their debts come along too.
• Shop the housing number. A larger down payment, a lower-priced home, or buying down the rate all shrink the housing payment and therefore both ratios.
• Refinance or restructure existing debt to a lower monthly payment where it genuinely saves money — the ratio responds to the monthly payment, not the balance.

Frequently Asked Questions

What DTI do I need to buy a house?

There is no universal cutoff, but most buyers are on solid ground with a back-end DTI at or below 43%, and many conventional and FHA loans allow higher with compensating factors and an automated approval (as of July 2026). Lower is always stronger. — source: Zeitro, 2026

Does my rent count in DTI?

Your current rent generally does not count in the DTI a lender uses to qualify you, because it is expected to be replaced by your new mortgage payment. The lender uses the proposed housing payment instead. Rent history can still matter as a credit factor for some programs.

What is the difference between front-end and back-end DTI?

Front-end is only your housing payment relative to income; back-end includes housing plus all other monthly debts. Back-end is almost always the number that decides your loan, since it is the higher and more complete figure.

Do student loans count in my DTI?

Yes. Student loans are counted as monthly debt. If a loan is in deferment or on an income-driven plan showing $0, lenders may still impute a payment (often a small percentage of the balance) depending on the program — so a $0 statement does not always mean $0 in the calculation. Confirm the current rule for your loan type with a lender. (as of July 2026)

Can I get approved with a high DTI?

Sometimes. With strong compensating factors — high credit score, significant cash reserves, a large down payment — automated underwriting for conventional and FHA loans can approve back-end DTIs into the 45–50%+ range. The higher your DTI, the more those other strengths need to carry the file. (as of July 2026)

Last reviewed July 3, 2026 by the askdoss Editorial Team. This calculator and its supporting information are for general educational purposes only and are not financial, tax, legal, or investment advice. Figures cited are estimates that change over time — verify current numbers with the relevant institution or a qualified professional before making decisions.