ReckonBoxWhat a debt-to-income ratio measures
A debt-to-income ratio is your monthly debt payments divided by your gross monthly income, written as a percentage. The CFPB works the example of $2,000 of debt against $6,000 of income, giving 33 percent. Wells Fargo describes the ratio and your credit history as the two financial-health factors lenders weigh when deciding whether to lend, and of the two, this is the one you can compute exactly and change deliberately.
Mortgage underwriting splits it in two. On the defaults here, $2,800 of housing against $10,000 of gross income is a front-end ratio of 28%. Add $650 of car and card payments and the back-end ratio reaches 34.5%.
Why one number isn't enough
Front-end counts the housing payment alone; back-end counts housing plus every other recurring debt. Both get tested, separately, and a file can pass one and fail the other. A borrower with no other debt and a borrower with a $900 car payment have identical front-end ratios, so a single blended figure cannot tell you which of the two constraints is the one standing in your way.
| Front-end | Back-end | |
|---|---|---|
| Conventional guideline | 28% | 36% |
| FHA guideline | 31% | 43% |
| VA guideline | 41% |
Those pairs are underwriting guidance, not statute. Lenders approve above them routinely where credit, cash reserves or a larger down payment offset the risk, and they decline below them where something else in the file is weak.
The 43% that isn't a rule any more
The figure most widely quoted as the legal debt-to-income ceiling was removed from the regulation years ago. The CFPB's General Qualified Mortgage final rule "removes the General QM loan definition's 43 percent DTI limit and replaces it with price-based thresholds", which turn on how a loan's rate compares to the average prime offer rate rather than on any ratio. Its own consumer explainer on debt-to-income names no threshold at all, saying only that different loan products and lenders set different limits.
Worth knowing before you treat 43% as a wall. It describes what a lot of lenders do, not what any of them must do.
Gross, not take-home
Every one of these ratios uses income before tax, which is why a comfortable-looking DTI can sit on top of an uncomfortable budget. Payroll tax, income tax and retirement contributions come out of the same income the ratio counts as available. A 36% back-end ratio on gross income can be well past 45% of the money that actually lands in the account, and the ratio will not tell you that.
What counts as debt is narrower than most people assume: mortgage or rent, car loans, student loans, personal loans, minimum card payments, child support and alimony. Utilities, groceries, phone bills and subscriptions are excluded, because they are not debt obligations. That exclusion cuts both ways, since a lender's view of your capacity ignores costs you cannot actually avoid.
What this does not decide for you
This calculator computes two ratios and compares them to published guidance. It is not a credit decision, a pre-qualification or an approval, and no calculator can be, because underwriting weighs credit history, employment, reserves, property type and the loan's pricing alongside these figures. Wells Fargo attaches the same caveat to its own tool. For a decision on your file, talk to a lender or a licensed mortgage professional.
Frequently asked questions
What is a debt-to-income ratio? A debt-to-income ratio is all your monthly debt payments divided by your gross monthly income, expressed as a percentage. The CFPB works the example of $2,000 of debts against $6,000 of income giving 33 percent. On the defaults here, $3,450 of total debt against $10,000 of income is a back-end ratio of 34.5%.
What is the difference between front-end and back-end DTI? Front-end counts only the housing payment against gross income, and back-end counts housing plus every other recurring debt. On the defaults, $2,800 of housing on $10,000 of income is a front-end ratio of 28%, and adding $650 of other debt takes the back-end ratio to 34.5%. Mortgage underwriting tests both, which is why one blended number cannot tell you which one would fail.
What DTI do I need to get a mortgage? There is no single answer, and the guideline pairs differ by program: roughly 28/36 for conventional lending, 31/43 for FHA and 41 back-end for VA. These are underwriting guidance, and lenders regularly approve above them where credit, reserves or down payment are strong.
Is 43% the legal maximum debt-to-income? Not any more. The CFPB states that its General Qualified Mortgage rule removes the 43 percent DTI limit and replaces it with price-based thresholds, so 43% now describes lender convention rather than a regulatory ceiling. The CFPB own explainer on the ratio names no threshold and says limits vary by loan product and lender.
What counts as debt in the calculation? Recurring contractual payments: mortgage or rent, car loans, student loans, personal loans, minimum credit card payments, child support and alimony. Utilities, groceries, insurance premiums that are not part of the housing payment, and subscriptions are not counted, because they are not debt obligations.
Does paying off a card lower my DTI? It lowers the back-end ratio, because the minimum payment leaves the numerator, and it leaves the front-end ratio untouched, because housing has not changed. Whether that helps a mortgage application depends on which ratio was the binding one, which the house affordability calculator shows directly.
Why use gross income rather than take-home pay? Because that is the convention underwriting uses, and it is why a DTI can look comfortable while a budget does not. Tax and payroll deductions come out of the same income the ratio treats as available, so a 36% back-end ratio on gross can be well over 45% of what actually arrives in the account.