Your total monthly income before taxes and deductions.
Monthly Debt Payments
Personal loans, alimony, child support, or other recurring obligations.
Your Results
Enter your income and debts, then click calculate.
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Introduction
DTI is the first number a mortgage underwriter looks at, and it is the most common reason qualified borrowers get declined. A $95,000 salary sounds like plenty until the underwriter adds up a $1,600 mortgage payment, a $450 car loan, a $380 student loan payment, and $200 in credit card minimums. That is $2,630 per month in debt service against $7,917 gross monthly income, a 33.2% back-end DTI that passes. But add a co-signer obligation or a personal loan, and the ratio crosses into restricted territory. Under 2026 Qualified Mortgage (QM) rules codified by the Consumer Financial Protection Bureau, a back-end DTI above 43% generally disqualifies borrowers from QM protections, though some lenders will go higher with compensating factors. This calculator shows your exact DTI before you apply, so there are no surprises at the underwriting stage.
What This Calculator Does
This debt-to-income ratio calculator computes both the front-end ratio (housing costs as a percentage of gross monthly income) and the back-end ratio (all monthly debt obligations as a percentage of gross monthly income). Enter your gross monthly income, proposed housing payment, and all recurring debt payments to see exactly where you stand against standard lender thresholds for conventional, FHA, and VA loan programs.
The Formula
The front-end ratio includes only housing costs: mortgage principal, interest, property taxes, and homeowners insurance (PITI). For FHA loans, HOA dues are also included. The back-end ratio adds every other recurring debt obligation to the housing payment: car loans, student loans, credit card minimums, personal loans, alimony, child support, and co-signed debts. Both ratios always use gross (pre-tax) monthly income as the denominator.
Step-by-Step Example
Calculate gross monthly income
Divide annual salary by 12. For variable income (freelancers, sales), lenders typically average the last 24 months of tax returns. Example: $108,000/year = $9,000/month gross.
Enter proposed housing payment
For a mortgage, include principal + interest + taxes + insurance (PITI). Example: $2,100/month total PITI on a proposed $380,000 home purchase.
List all monthly debt payments
Car loan: $520. Student loans: $310. Credit card minimums: $185. Total non-housing debt: $1,015/month.
Review both ratios
Front-end: $2,100 / $9,000 = 23.3% (passes conventional 28% limit). Back-end: ($2,100 + $1,015) / $9,000 = 34.6% (passes conventional 36% guideline). Loan approval likely.
Real-World Use Cases
Pre-Purchase Qualification Check
Before engaging a real estate agent and getting emotionally invested in a property, a buyer calculates their maximum purchase price by working backward from the DTI limit. At $8,500 gross monthly income with $950 in existing debt, the back-end limit of 43% allows $2,705 total debt payments, leaving $1,755 available for PITI.
Debt Paydown Priority Decision
A borrower at 47% back-end DTI needs to get below 43% to qualify. They owe $2,800 on a credit card ($85 minimum) and $14,000 on a car loan ($380/month). Paying off the credit card eliminates $85/month and drops DTI to 46%. The car payoff eliminates $380 and drops DTI to 42.8%. The car payoff achieves the goal faster despite the higher balance.
Rental Property Financing
A real estate investor calculating DTI for a rental property purchase uses their W-2 income and adds 75% of projected rental income (lender standard). They also verify the new PITI for the investment property fits within their available DTI capacity before making an offer.
Comparison
| Loan Type | Max Front-End DTI | Max Back-End DTI | Notes |
|---|---|---|---|
| Conventional (Fannie/Freddie) | 28% | 36% preferred / 45% max | Higher with strong compensating factors |
| FHA | 31% | 43% standard / 50% with compensating factors | Includes MIP in housing payment |
| VA | No hard limit | 41% guideline | Residual income requirement also applies |
| USDA | 29% | 41% | Income limits also apply |
| Jumbo | 28-30% | 38-43% | Varies by lender, stricter underwriting |
Common Mistakes to Avoid
Using net take-home pay instead of gross income. Lenders always use gross (pre-tax) income for DTI calculations. A $6,500 take-home from a $9,000 gross salary: the correct denominator is $9,000.
Omitting co-signed debt obligations. If you co-signed a student loan or auto loan for someone else, that monthly payment is counted in your back-end DTI even though you are not the primary borrower and may never actually make a payment on it.
Excluding HOA dues and PMI from the front-end calculation. For FHA loans, HOA dues are included in the housing payment. Private mortgage insurance (PMI), required on conventional loans with less than 20% down, is also included in PITI for DTI purposes.
Assuming a low DTI guarantees approval. DTI is one of several underwriting factors. Credit score, cash reserves, employment stability, and loan-to-value ratio all affect the final decision. A DTI of 32% will not overcome a 580 credit score for most conventional programs.
Frequently Asked Questions
Accuracy and Disclaimer
This calculator provides DTI estimates based on the income and debt figures you enter. Actual loan qualification depends on credit score, employment history, cash reserves, loan type, lender-specific guidelines, and the full underwriting process. DTI thresholds shown reflect general 2026 conventional and government-backed loan guidelines and may vary by lender. Consult a licensed mortgage loan officer for pre-approval specific to your situation.
Conclusion
If your DTI is above your target threshold, reducing it before applying for a loan is more effective than shopping for a lender who will overlook it. Pay down the smallest debt balance first for a quick DTI improvement, since eliminating a monthly obligation entirely has a larger impact than reducing a balance. Once your DTI is in range, use the Mortgage Payment Calculator to confirm the proposed PITI payment stays within your front-end limit, or run the Loan EMI Calculator to model how a debt consolidation loan changes your total monthly obligations.
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