Debt-to-income ratio: how to calculate yours

The formula itself

Debt to income ratio is total minimum monthly debt payments divided by gross monthly income, multiplied by 100 to get a percentage. Gross income is your pay before taxes and other deductions come out, not what lands in your bank account. Lenders ask for gross income because it is the number reported consistently on pay stubs and tax documents, which makes it easier to compare across applicants.

What counts as a monthly debt payment

Include rent or a mortgage payment, car loan payments, student loan payments, minimum payments on every credit card, personal loan payments and any court-ordered payments like child support. Do not include utilities, insurance, groceries, phone bills or subscriptions. Those are living expenses, not debt, even though they leave your account every month the same way a loan payment does.

Why lenders look at this number

A lender wants to know how much of your income is already committed before adding a new payment on top. A high ratio suggests less room, which is why it factors into mortgage, auto loan and other lending decisions. Requirements vary by lender and loan type, so check with the specific lender for what they need rather than assuming one rule applies everywhere.

Calculating your own ratio

You do not need a lender to find this number. Pull your last pay stub for gross pay, or use last year's gross income divided by twelve if your pay varies.

1. List every payment from the previous section and add them up.
2. Find your gross monthly income from a recent pay stub or tax return.
3. Divide total monthly debt payments by gross monthly income.
4. Multiply by 100 to get a percentage.
5. Recalculate whenever a debt payment or your income changes.

Reading a change in your ratio over time

A single ratio is a snapshot. Tracking it every few months shows direction. A ratio that falls as balances shrink or income rises is moving the right way even if the number itself still looks high. A ratio that climbs, especially from added debt rather than lower income, is worth a closer look before it becomes a bigger problem.

Common questions

Do lenders count potential rent for a home I am buying, not my current rent?

For a mortgage application, lenders typically use the new expected housing payment rather than your current rent. Ask your specific lender how they calculate it, since practices vary.

Should I use net income instead of gross for my own tracking?

You can track both if it helps you, but use gross income if you want your number to match how lenders calculate the ratio, since that is the standard they use.

Does this ratio include my spouse's income and debt?

That depends on whether you are applying jointly or tracking your own household finances. For a joint application, a lender usually combines both incomes and both sets of debt payments.

How often should I recalculate my ratio?

Every few months is usually enough, or any time a major payment changes, like paying off a loan or taking one out. Frequent small checks will not show much movement.