Debt-to-Income Ratio Calculator

DTI is the single number lenders look at first. Enter your monthly income and either a total or itemized list of debt payments — the calculator shows your ratio and where it lands on the standard 36% / 43% thresholds.

Monthly gross income (before tax)

Wages, self-employment, alimony, regular bonuses. Pre-tax.

Total monthly debt payments

Rent or mortgage, car, credit card minimums, student loans, any installment loans.

Your DTI ratio

33.8%

$2,200 of $6,500/mo

Lender view

Healthy

Under 36%

Room to 36% target

Already there

Debt to shed (or income to add) to hit the "healthy" band.

0%36%43%60%+

Healthy. Most lenders treat DTI under 36% as a strong signal — you have room to qualify for new credit and to absorb a setback without missing a payment.

What DTI actually is

Debt-to-income ratio is exactly what it sounds like: the sum of your required monthly debt payments divided by your gross monthly income, expressed as a percentage. If you earn $6,500/month before taxes and your mortgage, car, student loans, and credit card minimums add up to $2,200/month, your DTI is 2,200 ÷ 6,500 = 33.8%. That's the whole formula. The interesting question isn't how to compute it — it's what counts as a debt payment, and where the thresholds come from.

On the income side, lenders use gross income — pre-tax. Wages, salary, self-employment net income, regular bonuses, alimony you receive, and (with two years of history) documented side income all count. On the debt side, they include anything that would appear as a recurring obligation on a credit report or court order: housing (rent or PITI on a mortgage), auto loans and leases, credit card minimums, student loans, personal loans, HELOCs, and any court-ordered support. They exclude ordinary living expenses — utilities, groceries, insurance not bundled into a mortgage, subscriptions, and retirement contributions are not debt.

Why the 36% and 43% thresholds matter

The bands the calculator uses are not arbitrary. They map to how real lenders make real decisions:

Under 36% — the comfort zone. Conventional mortgage underwriters treat this as a strong signal. New auto loans and personal loans qualify on rate, not on borderline approval. You have room to absorb an emergency without skipping a payment.
36% to 43% — the borderline. Most lenders will still approve, but they look harder at compensating factors: credit score, cash reserves, employment stability. Any new debt you take on lands you closer to the cap.
Above 43%— the regulatory wall. The Qualified Mortgage rule caps conforming residential mortgages at 43% back-end DTI; above that, the loan loses its legal safe harbor and most lenders won't make it. FHA can stretch into the high 40s with compensating factors, and non-QM and portfolio products go higher, but the rate paid for the additional risk climbs sharply.

Front-end vs. back-end DTI

Mortgage underwriters distinguish two versions. Front-end DTI is housing-only: PITI on the proposed mortgage divided by gross income. Back-end DTIis total debt divided by gross income — housing plus everything else. The common rule of thumb is 28% front-end and 36% back-end as the "healthy" targets, with 43% as the upper limit for a conforming loan. The calculator on this page computes back-end DTI, which is the broader and more frequently cited number, and the one that answers the question "am I carrying too much debt overall?"

Two levers to lower DTI

DTI is a ratio, so there are only two things you can change: shrink the numerator (debt payments) or grow the denominator (income). Each has a different mechanic.

Shrinking debt payments.Installment loans (auto, student, mortgage) have a fixed scheduled payment that doesn't change as you pay down principal — extra principal payments shorten the payoff term but don't lower the monthly DTI number until the loan is gone. Revolving debt (credit cards) is the opposite: the minimum is roughly interest plus 1% of principal, so every dollar of principal reduction shrinks the minimum, and clearing a card to zero removes it from the numerator entirely. That's why credit card payoff usually produces the largest DTI improvement per dollar applied. See paying extra on principal for the math on installment loans, and the credit card minimum payment trap for why card minimums are so sticky.

Growing income. A 10% raise pushes DTI down by ~10%, the same as cutting your debt payments by 10%. The catch for mortgage purposes is that lenders need two years of documented history on side income before it counts — W-2 base wages count immediately, but 1099 and self-employment income typically need a two-year average. A documented raise on your primary job is the fastest income lever lenders will recognize.

If your DTI is too high, pick a payoff order

Once you know your DTI and which debts are driving it, the next question is which to attack first. Two well-known strategies:

Debt Avalanche — highest-APR first, minimizes total interest paid.
Debt Snowball — smallest-balance first, fastest first win.
Snowball vs. avalanche — a worked example comparing the two on the same portfolio.

If most of your DTI is housing, the levers are different — a refinance, an income increase, or selling and downsizing. If most of it is credit cards, the snowball/avalanche tools above are the right place to start. Consolidation can also reduce DTI if the new loan's monthly payment is lower than the sum of the payments it replaces — though stretching the term to get there usually costs more in total interest, so run the numbers before committing.

Quick reference

DTI band	What it usually means
Under 36%	Healthy. Qualifies for most mortgages at best rates; room to take on planned debt without stress.
36% – 43%	Caution. Approvals get scrutinized. New debt likely pushes you past the conforming-mortgage cap.
Above 43%	Lender concern. Above the Qualified Mortgage cap; most conforming products won't underwrite. Payoff or income growth before new credit applications.

Frequently asked questions

What counts as a debt payment for DTI?

Lenders include the required minimum monthly payment on every recurring obligation that would show on a credit report or a court order: rent or mortgage (principal, interest, taxes, and insurance — PITI), auto loan and lease payments, student loan payments (the actual scheduled amount, not the IDR-zero number on many federal loans), credit card minimums, personal loans, HELOCs, and court-ordered alimony or child support. Utilities, insurance not bundled into a mortgage, groceries, subscriptions, and savings contributions are not included — those are living expenses, not debt.

Is DTI calculated on gross or net income?

Gross — before taxes and most deductions. That feels generous compared to what hits your bank account, but it's the standard underwriters use, and the 36% and 43% thresholds are calibrated around gross income. If you want a stricter personal target, calculate against your take-home pay separately; it's a more conservative view of how much room you actually have to absorb a setback.

What's the difference between front-end and back-end DTI?

Front-end DTI is housing-only — your mortgage payment (or rent) divided by gross income. Back-end DTI is total debt divided by gross income, including housing plus every other recurring payment. Mortgage underwriters look at both: a common guideline is a front-end of 28% or less and a back-end of 36% or less, with conforming loans capped at 43% back-end under the Qualified Mortgage rule. This calculator computes back-end DTI, which is the broader and more commonly cited number.

Why is 43% the magic line for mortgages?

Because that's the regulatory cap for a Qualified Mortgage (QM) under the Consumer Financial Protection Bureau's rules. Loans above 43% back-end DTI can still be made, but they lose QM status and the legal safe harbor it confers on the lender, so most conforming mortgage products simply won't underwrite past that number. FHA loans can stretch into the high 40s with compensating factors, and some non-QM and portfolio lenders go higher, but the cost of credit rises as DTI rises — you pay for the additional risk in the rate.

Does paying down a credit card balance lower my DTI even if the minimum doesn't change much?

Yes, modestly. The minimum on most cards is the interest plus about 1% of the balance, so reducing the balance shrinks the minimum proportionally. The bigger DTI lever is closing a card balance entirely — once the balance hits zero, the minimum drops to zero and the entire payment leaves the numerator. That's why credit card payoff often produces a larger DTI improvement than a similar dollar amount applied to an installment loan, where the scheduled payment stays the same until the loan is gone.

Can I lower DTI by adding income instead of paying off debt?

Yes — and for some borrowers it's the faster lever. DTI is a ratio, so a 10% income increase moves the denominator and the ratio falls by the same proportion. Mortgage lenders generally want two years of history on side income before they'll count it (W-2 main job income counts immediately; 1099 and self-employment income typically need a two-year average). A documented raise or a documented second job can be counted right away. For non-lending purposes — e.g., deciding whether your own debt load is healthy — extra income counts the same day it arrives.