Debt-to-Income Ratio

Reviewed 12 August 2026 · Sourced from the Consumer Financial Protection Bureau, the Code of Federal Regulations and the Fannie Mae Selling Guide

What a debt-to-income ratio actually is

You earn $5,200 a month before taxes. A loan officer adds up every payment you are contractually obligated to make — the mortgage you are asking for, the car, the student loan, the minimums on two cards, the child support — and gets $2,516. Then divides. 48.4 percent.

That calculation took ten seconds and will decide more about the loan than your job title or how well the conversation goes. It is your debt-to-income ratio, the most load-bearing number in consumer lending.

The Consumer Financial Protection Bureau states it without decoration: your DTI is all your monthly debt payments divided by your gross monthly income. Gross means before taxes and deductions. Monthly debt payments means the minimum you are required to pay, not the larger amount you may choose to pay.

On a mortgage this is not a courtesy calculation. Under 12 CFR § 1026.43(c)(2)(vii), a creditor making a covered residential loan must consider “the consumer’s monthly debt-to-income ratio or residual income” and verify the figures against third-party records. Read the conjunction carefully. The rule says or. DTI is the industry’s default answer to that requirement, not the requirement itself — which matters enormously if your ratio is ugly and your bank balance is not.

Front-end and back-end: one name, two numbers

Lenders compute two ratios and write them as a pair, like 31/43. The front-end ratio, or housing ratio, is housing cost alone divided by gross income. The back-end ratio, or total debt ratio, is every required monthly debt payment, housing included, divided by the same income.

Front-end asks whether the house fits. Back-end asks whether it fits on top of everything you already signed for. An unqualified “DTI” means the back-end number roughly always.

Why gross income flatters the ratio

Both ratios divide by gross monthly income — the number on the offer letter, not the number that lands in the account. Taxes, payroll deductions, the health premium and the retirement contribution all come out before you pay a single creditor, and the ratio is blind to every one of them. Here is the same household measured both ways, with the debt column held still.

The $4,050 take-home figure is our assumption, not a statistic — withholding varies by state, filing status and benefit elections — but the point survives any reasonable substitution. The lender sees a 48.4 percent borrower. The borrower lives a 62.1 percent life. Only one of those numbers buys groceries.

What counts as debt, and what the ratio cannot see

The numerator is narrower than people expect, and the exclusions are the interesting part. A payment counts if you are legally obligated to make it and it appears on a credit report or a court order. It does not count if it is merely a cost of being alive.

The three that surprise people

Housing means the whole payment. Taxes, the insurance premium, mortgage insurance and HOA dues all land in the numerator alongside principal and interest. Lenders shorten this to PITI. A quoted payment that leaves out escrow is not the number your ratio will use, and the gap is routinely $300 or more.

A co-signed loan is your loan. If your sister makes every payment on the car you co-signed, it still counts against you, because the contract still names you. Some programs remove it with a year of documented payments from her own account.

A deferred student loan is usually not a zero. Programs generally require a payment to be counted even when nothing is due, taken from the repayment plan or from a percentage of the balance. That percentage differs by program and has changed more than once, so check the current selling guide.

One household, worked all the way through

Housing totals $1,570. Everything else that counts totals $946. So:

Now retire one debt

The auto loan has nine payments left, about $3,735 of remaining balance. Pay it off and the $415 line disappears from the numerator entirely.

Eight full points, from one payment. The front-end ratio does not move at all, because nothing about the house changed.

Put the same $3,735 against the credit cards instead. Say they carry roughly $4,800 in balances against $95 of minimums; paying $3,735 down leaves about $1,065 owed and a minimum near $27, a $68 improvement worth 1.3 points. Same money, one-sixth the effect, because a minimum shrinks with the balance while an installment payment does not shrink at all until it vanishes.

One more thing. Take-home is about $4,050, so after $2,516 of debt payments $1,534 remains against $1,900 of groceries, utilities, daycare and fuel. The DTI passes at plenty of lenders. The month does not. Run your own version in the debt overview calculator and the budget calculator side by side; they answer different questions.

The 43 percent rule that stopped being a rule

Search for a DTI limit and article after article will tell you 43 percent is the legal maximum for a mortgage. It was true. It has not been since 1 October 2022, and the number was not raised — it was deleted.

Where it came from

The 2013 ability-to-repay rule created a safe harbor called a Qualified Mortgage. The General QM version required a back-end DTI at or below 43 percent, computed under a rigid instruction set called Appendix Q. Alongside it sat a temporary category, nicknamed the patch, letting loans eligible for Fannie Mae or Freddie Mac qualify without meeting that test. In practice the patch swallowed the rule.

What replaced it

The CFPB’s December 2020 final rule, in the Bureau’s own words, “removes the General QM loan definition’s 43 percent DTI limit and replaces it with price-based thresholds”. Appendix Q went with it. The test is now the loan’s price, not the borrower’s ratio: a loan is a General QM only if its annual percentage rate stays below a set spread over the average prime offer rate for a comparable transaction.

Those are the figures printed in § 1026.43(e)(2) today; the dollar breakpoints are adjusted annually for inflation, and more generous thresholds exist for small creditors and manufactured housing. The rule took effect 1 March 2021 with mandatory compliance delayed to 1 October 2022 — the same day the GSE patch expired.

So a lender who tells you 43 percent is the legal cap is describing their own credit policy or an investor’s overlay and calling it federal law. Those overlays are real and will still decline your file. They are not the same thing, and a second lender may not share them.

What each loan program actually allows

With the federal ceiling gone, the operative limits come from whoever insures or buys the loan. The published figures, with a citation for each:

The VA does something genuinely different

A ratio asks what share of your income is committed. Residual income asks how many dollars are left when everything is paid. A surgeon and a warehouse worker can share a DTI and not remotely share a month, and the VA is the only major program that measures the difference.

The regulation sets the guideline at “41 percent or less,” but under 38 CFR § 36.4340(c)(3), a higher ratio needs no second-level review when residual income exceeds the published table by 20 percent or more. That table, for loans of $80,000 and above:

Take the example household as a family of four in the South. After taxes and every debt payment they hold $1,534. The lender subtracts an allowance for maintenance and utilities — commonly about fourteen cents per square foot, or $224 on a 1,600 square foot house — leaving roughly $1,310 of residual income. The table asks $1,003; twenty percent above that is $1,203.60. They clear it, so a 48.4 percent ratio passes without the justification memo a conventional lender would have demanded. That is a second measuring instrument, not a loophole, and it often reaches a more honest answer than the percentage does.

Your DTI is nowhere in your credit score

The most common confusion about this term, so bluntly: your debt-to-income ratio has no effect on your credit score, because your credit report does not contain your income.

FICO says so directly. Among the factors it lists as having no influence on a score, income is third and employment history fourth: “The amount of money you earn, or changes that take place in your income, do not factor into your FICO Scores”. The CFPB’s list of what goes into a credit score — payment history, unpaid debt, account types and ages, credit used against credit available, new applications, collections and bankruptcies — has no income line either. A model cannot use data it was never given.

The ratio people are actually thinking of

What does move the score is credit utilization — revolving balances divided by revolving limits. It looks like DTI because it is also a ratio about debt. It behaves nothing like it.

Watch the same dollars behave differently. A card carrying $4,800 against a $6,000 limit is at 80 percent utilization with roughly a $120 minimum. Pay it to zero and utilization falls from 80 to 0, typically a substantial score move within a cycle or two. The DTI effect is $120 against $5,200 of gross income: 2.3 points.

The levers point in different directions. Clearing revolving balances is the score lever; closing out whole installment payments is the DTI lever. A mortgage file is graded on both, by different systems — which is why “my credit is excellent” and “my ratio is too high” can both be true at once.

What is confirmed, what is unverified, what is convention

The dollar figures in the worked example are our own arithmetic on an invented household, not data.

What trips people up

Using take-home pay

The example household computes 62.1 percent against take-home, decides it is hopeless and never applies — while the lender’s number is 48.4 percent, inside Fannie Mae’s 50 percent automated limit. The cost is a loan you never applied for, which is invisible and never counted.

Believing 43 percent is the legal ceiling

It has not been since October 2022. A borrower at 46 percent who accepts “federal law caps you at 43” from the first lender they call may never make a second call. The difference between a 46 percent decline and a 46 percent approval is often just the next phone number.

Forgetting the ratio includes the payment you are asking for

Your current DTI is not the number being judged; the proposed housing payment goes in the numerator first. And what counts is full PITI plus mortgage insurance and HOA dues, not the principal-and-interest figure in the rate quote. That gap alone is $390 a month here, worth 7.5 ratio points.

Paying down the biggest balance

Instinctive and, for this one purpose, backwards. What moves a ratio is which payment disappears completely, not which balance shrinks most. The debt payoff calculator shows the order — though whether the ratio is the right goal is a separate question, since the cards may carry the higher rate.

Financing something between pre-approval and closing

Lenders re-pull credit shortly before closing. A $560 car payment taken on after pre-approval adds 10.8 points to a $5,200 household and can undo the approval, with earnest money and the appraisal fee already spent.

Reading a passing ratio as an affordable month

Here the DTI passes and the household is $366 short every month. Underwriting tests whether the lender gets paid. Whether you can live there is a different calculation, and you are the only one running it. Stage 3 of the course works through both.

The figures on this page are checked against the source that publishes them, and dated. Published rates move after the release named above — the linked source always carries the current number. This page explains a term; it does not recommend a product.