What Is a Debt-to-Income Ratio, and What Should Yours Be?

Your debt-to-income ratio (DTI) is your total monthly debt payments divided by your gross monthly income — income before taxes, not take-home. The CFPB's DTI page describes it as one way lenders measure your ability to manage the payments on money you want to borrow. That's the framing: DTI is not a grade on your finances. It's a lender's quick answer to one question — how much of this person's paycheck is already spoken for?

What counts, and what doesn't

The numerator is debt payments, not expenses. Count: rent or the proposed mortgage payment (the full PITI), car loans, student loans, personal loans, and the minimum payments on your credit cards — the minimums, even if you actually pay more. Court-ordered obligations like child support count too. Skip: utilities, groceries, gas, phone plans, insurance premiums, subscriptions. That cutoff is why a "healthy" DTI can coexist with a genuinely strangled budget — a $400 daycare bill and a $400 car payment feel identical on the first of the month, but only one of them is in the ratio.

A worked example

Gross income $7,000 a month. Debts: a $450 car payment, $300 in student loans, and $150 in credit card minimums — $900 a month.

• Before housing: $900 ÷ $7,000 = 12.9%.
• Now apply for a mortgage with a $1,620 monthly PITI: ($900 + $1,620) ÷ $7,000 = 36.0% — exactly on the traditional line.
• The housing share alone, $1,620 ÷ $7,000 = 23.1%, is the "front-end" ratio; the 36% total is the "back-end." The 28/36 rule is just named caps on this pair.

Run your own version in the affordability calculator — it works the same math backwards, turning your income and debts into the payment a lender would let you carry.

What should yours be?

There is no single legal cutoff — as the CFPB puts it, different loan products and lenders have different DTI limits. In practice, the traditional comfort zone for a mortgage tops out around 36%, many programs stretch well past it, and lower is always stronger. But notice which direction the incentives point: the lender's limit is the most they'll approve, not a recommendation. A ratio that clears underwriting can still leave your actual after-tax budget with no room — DTI is computed on gross income, and you pay your bills with net.

What moves it

The ratio has exactly two levers. Income is one; the numerator is usually the faster one, and it rewards eliminating payments, not just shrinking balances. Paying $3,000 spread across your cards barely moves their minimums — but paying off a $3,000 loan that costs $150 a month removes the whole $150 from the ratio, dropping the example above from 36% to 33.9%. If a payoff order is the question, the debt payoff calculator compares avalanche and snowball on your real debts. If you want the running number rather than a one-off, FWF Ledger, our companion app, shows your debt-to-income ratio computed from your actual debts and keeps it current as you pay them down — that part is on the free tier.

Honest limits

DTI ignores interest rates entirely: $900 a month of 5% car loan and $900 a month of 24% card debt are identical to the ratio and wildly different to your future. It ignores everything the numerator skips, so it says nothing about whether your life is affordable — only whether your debts are. And because it uses minimum card payments, aggressive payers look no better than coasters. It's a lending gate, not a health score. Treat clearing it as the start of the affordability question, not the answer.

Lenders use DTI to protect their money, and it's decent at that. Protecting your month-to-month life is a different job, and DTI never applied for it.

Common questions

Does DTI affect my credit score?

No — income isn't on your credit report, so no scoring model can see the ratio. What overlaps is credit utilization, which compares card balances to limits and is very much in the score.

Is rent in my DTI?

For a mortgage application, your current rent is replaced by the proposed housing payment. For other loans, lenders commonly count your rent as an obligation. Either way, housing is in the ratio somewhere.

Whose income counts?

Whoever is on the application. A co-borrower adds their income to the denominator — and their debts to the numerator, which doesn't always help as much as expected.

This article is general information, not personalized financial advice. How we write and review articles is covered in the editorial note on our About page.