Direct Answer
Your debt-to-income (DTI) ratio divides your total monthly debt payments by your gross monthly income. Lenders look at two versions: the front-end ratio (housing only) and the back-end ratio (all debts). Conservative targets are 28% for housing and 36% for total debt on a $7,000/month income — about $1,960 for housing and $2,520 for all debt.
Check yours with the DTI Mortgage Calculator before you apply.
Last verified on: June 28, 2026
Editorial note: DTI guidelines vary by loan program, lender overlay, and automated underwriting result. This guide uses common planning benchmarks, not a guarantee of approval.
Research method: Daily Calcs reviewed CFPB DTI guidance, Federal Housing Administration (FHA) handbook DTI references, and modeled scenarios at $7,000 and $10,000 gross monthly income. Verified June 28, 2026.
The 28/36 Rule Explained
The 28/36 rule is the most common DTI guideline:
- Front-end (28%): total housing cost — principal, interest, taxes, insurance, homeowners association (HOA), and mortgage insurance — should stay at or below 28% of gross income.
- Back-end (36%): all monthly debt payments, including housing, should stay at or below 36% of gross income.
Lenders weigh the back-end ratio most heavily because it reflects your full obligation load.
Worked Example: $7,000 Gross Monthly Income
| Ratio | Limit | Max monthly payment |
|---|---|---|
| Front-end (28%) | 0.28 × $7,000 | $1,960 housing |
| Back-end (36%) | 0.36 × $7,000 | $2,520 total debt |
Existing debts: $500/month (car + student loans)
| Constraint | Available for housing |
|---|---|
| Front-end cap | $1,960 |
| Back-end cap ($2,520 − $500) | $2,020 |
The binding constraint is whichever ratio you hit first. Here the front-end cap ($1,960) is slightly tighter than the back-end housing room ($2,020).
Salary comparison table
| Gross annual income | Gross monthly | 28% housing cap | 36% total debt cap |
|---|---|---|---|
| $84,000 | $7,000 | $1,960 | $2,520 |
| $100,000 | $8,333 | $2,333 | $3,000 |
| $120,000 | $10,000 | $2,800 | $3,600 |
| $150,000 | $12,500 | $3,500 | $4,500 |
What Counts in DTI
| Counts toward DTI | Usually excluded |
|---|---|
| Proposed full PITI (Principal, Interest, Taxes, and Insurance) payment | Utilities, groceries |
| Car loans and leases | Cell phone (unless financed) |
| Student loan minimums | Car insurance (non-escrowed) |
| Credit card minimum payments | Retirement contributions |
| Child support / alimony | Income taxes withheld |
Student loans in deferment may still count — lenders often use 1% of balance or the payment on your credit report.
Program DTI Limits (Planning Ranges)
| Program | Typical back-end DTI |
|---|---|
| Conventional (AUS approve) | 36% – 45%+ |
| FHA | Often up to 43% – 50% with compensating factors |
| U.S. Department of Veterans Affairs (VA) | Flexible; residual income test also applies |
Federal Housing Administration (FHA) and automated underwriting can exceed 36% when credit, reserves, and down payment are strong.
Prequalification vs Pre-Approval
| Prequalification | Pre-approval | |
|---|---|---|
| Credit pull | Usually no | Yes |
| Income verified | Self-reported | Documented |
| Seller weight | Low | High |
| Reliability | Rough estimate | Conditional commitment |
Start with the DTI Mortgage Calculator and the Home Affordability Calculator to set a realistic budget, then pursue full pre-approval before house hunting.
How to Improve Your Ratio
- Pay down credit card balances to cut minimum payments.
- Avoid new loans or financed purchases before closing.
- Document stable bonus, overtime, or side income (two-year history helps).
- Consider a larger down payment or a less expensive home.
- Pay off a small high-payment installment loan if it clears the back-end hurdle.
Example: Paying off a $350/month car loan with a $8,000 balance can add $350/month of housing room under the back-end cap without raising income.
Decision Framework: FHA vs Conventional When DTI Is Tight
When your back-end DTI sits between 36% and 45%, the loan program you choose can determine approval:
| Your profile | Likely path | Why |
|---|---|---|
| Back-end 38%, credit 740+, 10% down | Conventional (AUS) | Strong file; automated underwriting may approve above 36% |
| Back-end 42%, credit 680, 3.5% down | FHA | Higher DTI tolerance; lower down payment |
| Back-end 45%+, high student loans | FHA with compensating factors | Document reserves, stable employment, minimal new debt |
| Back-end 33%, 20% down, no private mortgage insurance (PMI) goal | Conventional | Clean ratios; avoid FHA lifetime mortgage insurance on low equity |
Worked scenario: Gross income $8,333/month ($100,000/year). Existing debts $900/month. Back-end cap at 36% = $3,000 total debt room. Housing room = $3,000 − $900 = $2,100/month PITI.
If the home you want requires $2,400/month PITI, you are $300/month over the conservative back-end cap. Options: (1) pay down a $280/month credit card minimum to free room, (2) increase down payment to cut PITI by $150+, (3) apply FHA where automated underwriting may allow 43% to 50% back-end with strong compensating factors, or (4) add a co-borrower whose income exceeds their debts.
Run both programs in the DTI Mortgage Calculator and Home Affordability Calculator before choosing a lender. A pre-approval letter based on the wrong program wastes time if the back-end ratio fails underwriting later.
Pre-Application Checklist
- Calculate front-end and back-end DTI in the DTI Mortgage Calculator
- List every recurring debt on your credit report
- Estimate full PITI with the Mortgage Calculator — not P&I alone
- Avoid new credit inquiries except rate shopping within 14 days
- Gather W-2s, pay stubs, and tax returns for pre-approval
- Compare FHA vs conventional if back-end is above 36%
Calculator Methodology
Front-end DTI = Proposed housing payment ÷ Gross monthly income
Back-end DTI = (Housing + all monthly debts) ÷ Gross monthly incomeAssumptions: Gross income before taxes; housing includes full PITI plus HOA and PMI when applicable.
Limitations: Does not replace lender automated underwriting, VA residual income tests, or self-employment income analysis. Not an approval decision.
Related Reading
- FHA Loan Qualifications & Requirements — DTI rules for FHA
- How Much House Can You Afford? — salary-based budgets
- How to Find and Vet a Mortgage Lender — getting pre-approved
- VA Loan Eligibility & Payment Estimator — VA residual income rules
Official and Supporting Sources
Next Step
Enter your income and monthly debts in the DTI Mortgage Calculator to see your front-end and back-end ratios and how much room you have for a housing payment.
Frequently Asked Questions
What DTI ratio do mortgage lenders want?
Many lenders use the 28/36 rule as a guideline: no more than 28% of gross monthly income on housing (front-end) and no more than 36% on total debt (back-end). These are starting points, not hard cutoffs. FHA loans and automated underwriting systems frequently approve higher back-end ratios — often into the mid-40s and sometimes higher — when the borrower has strong compensating factors such as a high credit score, significant cash reserves, or a large down payment. The lower your DTI, the more pricing and program flexibility you tend to have.
Which debts count toward DTI?
Lenders count recurring monthly obligations that appear on your credit report or are legally required: car loans and leases, student loans, minimum credit card payments, personal loans, and court-ordered payments like child support or alimony. They also include the proposed full housing payment — principal, interest, taxes, insurance, and any HOA dues or mortgage insurance (PITI). Lenders generally do not count utilities, groceries, insurance premiums that are not escrowed, or other variable living expenses, since those are not fixed debt obligations reported to the bureaus.
How can I lower my DTI before applying?
The fastest levers are paying down revolving balances to reduce minimum payments, avoiding new debt or large purchases on credit before closing, and paying off or paying down a small installment loan that carries a high monthly payment. You can also raise the income side of the ratio by documenting bonuses, overtime, or a side income with a consistent history, or by adding a qualified co-borrower. Choosing a less expensive home or making a larger down payment lowers the proposed housing payment, which improves the front-end ratio directly.
Is prequalification the same as pre-approval?
No. Prequalification is a quick, informal estimate based on figures you self-report, and it usually does not involve a credit check or document verification, so it carries little weight with sellers. Pre-approval is a more rigorous process in which the lender pulls your credit, verifies income and assets, and issues a conditional commitment for a specific loan amount. In a competitive market, a pre-approval letter is far more persuasive than a prequalification, and it gives you a more reliable budget because the lender has actually checked the numbers.
Does adding a co-borrower help my DTI?
It can, but only if the co-borrower adds more qualifying income than debt. The lender evaluates the combined income and combined monthly obligations of all borrowers, so a co-borrower with steady income and few debts lowers the blended DTI and can increase the amount you qualify for. However, a co-borrower who carries significant car payments, student loans, or credit card balances can raise the combined ratio and hurt the application. Run both scenarios in a DTI calculator before deciding to add someone to the loan.
Front-end vs back-end DTI: Which matters more?
Lenders weigh the back-end ratio most heavily because it reflects your full debt load including the new mortgage. The front-end ratio isolates housing cost alone. You can pass the front-end cap but fail back-end if car and student loan payments are high — or vice versa if non-housing debt is low. Automated underwriting often flags whichever ratio is worse. Use the DTI Mortgage Calculator to see which limit binds first for your file.
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