Home > DTI Ratio Explained
Independent educational resource. Not a lender or NMLS-licensed mortgage professional.
DTI Ratio for Mortgages 2026: Post-2022 CFPB QM Rule, Real Limits
Your DTI ratio is the single most important number in mortgage underwriting. It determines how much you can borrow, which loan programs you qualify for, and whether compensating factors can push your approval higher. This guide covers both front-end and back-end DTI, the eight CFPB Ability-to-Repay factors lenders must verify (12 CFR § 1026.43(c)(2)), and the critical 2022 change to the CFPB Qualified Mortgage rule that most calculator sites still get wrong.
The 43% DTI bright-line was eliminated in 2022. Most calculator sites still get this wrong.
The CFPB General QM Final Rule (12 CFR § 1026.43(e)(2)), published at 86 Federal Register 22844 on 26 April 2021 and effective 1 October 2022, replaced the pre-2022 43% back-end DTI bright-line with an Annual Percentage Rate (APR) threshold relative to the Average Prime Offer Rate (APOR).
A loan qualifies for the General QM safe-harbour if its APR does not exceed APOR by more than the applicable threshold. The thresholds depend on lien position and loan amount:
| Lien / Loan Size | APR Over APOR Threshold |
|---|---|
| First-lien, loan ≥ $137,958 | 2.25 percentage points |
| First-lien, $82,775 - $137,958 | 3.50 percentage points |
| First-lien, < $82,775 | 6.50 percentage points |
| Subordinate-lien, ≥ $82,775 | 3.50 percentage points |
| Subordinate-lien, < $82,775 | 6.50 percentage points |
Source: CFPB General QM Final Rule, 12 CFR § 1026.43(e)(2)(vi). Dollar thresholds adjust annually for inflation; verify the current-year figures at consumerfinance.gov/rules-policy/regulations/1026/43. The thresholds above are the 2026 dollar figures (effective 1 January 2026) published in the CFPB's annual TILA / RESPA threshold-adjustment notice.
Why this matters in practice. 43% is not a Fannie Mae cap: Selling Guide B3-6-02 allows 50% through Desktop Underwriter and 36% to 45% for manually underwritten loans. Many lenders and calculators still use 43% as a conservative planning line. Lenders that originate loans under the General QM safe-harbour now manage QM eligibility through pricing (APR / APOR spread) rather than through the 43% DTI test. The bright-line is gone from the regulation; the habit persists in the industry.
What Is DTI and Why Lenders Care
DTI measures how much of your gross monthly income goes to debt payments. Lenders use two versions per the CFPB ATR rule (12 CFR § 1026.43(c)(2)(vii)) and the Fannie Mae Selling Guide B3-6 framework:
Front-End DTI
Housing costs / Gross monthly income
Includes only the proposed mortgage payment: principal, interest, property taxes, homeowner insurance, PMI / MIP, and HOA fees. Conventional lenders cap at 28%; FHA Handbook 4000.1 Section II.A.5.a.iii allows 31%.
Back-End DTI
(Housing + all debts) / Gross monthly income
Housing costs plus all monthly debt obligations per Fannie Mae B3-6-05: car loans, student loans, credit card minimums, personal loans, child support, alimony. This is the primary operational metric.
Worked example: $7,500/month gross income at PMMS 7.4% (15 October 2026)
Proposed housing payment (PITI): $2,100/month
Car loan: $400/month | Student loans: $300/month | Credit cards: $150/month
Front-end DTI: $2,100 / $7,500 = 28.0%
Back-end DTI: ($2,100 + $850) / $7,500 = 39.3%
Both ratios are within conventional and FHA operational ceilings. This borrower would likely be approved under Fannie Mae B3-6 and FHA Handbook 4000.1 Section II.A.5 standards.
The 8 CFPB Ability-to-Repay Factors
Under 12 CFR § 1026.43(c)(2), lenders originating a covered transaction must consider and verify these 8 underwriting factors. The rule derives from the Truth in Lending Act (15 U.S.C. § 1639c) and the Dodd-Frank Act § 1411.
- Current or reasonably expected income or assets (other than the collateral)
- Current employment status
- Monthly payment on the covered transaction
- Monthly payment on any simultaneous loan
- Monthly mortgage-related obligations (taxes, insurance, HOA, MIP)
- Current debt obligations, alimony, and child support
- Monthly debt-to-income ratio or residual income
- Credit history
Source: 12 CFR § 1026.43(c)(2)(i)-(viii). The CFPB does not specify how to weight the factors; lenders apply Fannie Mae, Freddie Mac, FHA, or VA selling-guide standards in practice.
Operational DTI Limits by Loan Type (Named Source for Each)
Conventional (Fannie Mae)
- Front-end
- N/A
- Back-end
- 36% (manual)
- Maximum*
- 45% manual with Eligibility Matrix credit score and reserves; 50% via Desktop Underwriter
- Source
- Fannie Mae Selling Guide B3-6-02
FHA (manual)
- Front-end
- 31%
- Back-end
- 43%
- Maximum*
- 37/47 with one compensating factor, 40/50 with two (580+ score)
- Source
- HUD Mortgagee Letter 2014-02; Handbook 4000.1 Section II.A.5.d
VA
- Front-end
- N/A
- Back-end
- 41% (standard)
- Maximum*
- Above 41%: supervisor justification + residual income test
- Source
- 38 C.F.R. § 36.4340(c), (e)
USDA
- Front-end
- 29%
- Back-end
- 41%
- Maximum*
- Higher with a GUS Accept or a debt ratio waiver
- Source
- USDA HB-1-3555 Chapter 11
QM safe-harbour (post-2022)
- Front-end
- N/A
- Back-end
- No DTI cap; APR/APOR test
- Maximum*
- Pricing-based, not DTI-based
- Source
- CFPB 12 CFR § 1026.43(e)(2)(vi); 86 FR 22844
| Loan Type | Front-End | Back-End Standard | Back-End Maximum* | Named Source |
|---|---|---|---|---|
| Conventional (Fannie Mae) | N/A | 36% (manual) | 45% manual with Eligibility Matrix credit score and reserves; 50% via Desktop Underwriter | Fannie Mae Selling Guide B3-6-02 |
| FHA (manual) | 31% | 43% | 37/47 with one compensating factor, 40/50 with two (580+ score) | HUD Mortgagee Letter 2014-02; Handbook 4000.1 Section II.A.5.d |
| VA | N/A | 41% (standard) | Above 41%: supervisor justification + residual income test | 38 C.F.R. § 36.4340(c), (e) |
| USDA | 29% | 41% | Higher with a GUS Accept or a debt ratio waiver | USDA HB-1-3555 Chapter 11 |
| QM safe-harbour (post-2022) | N/A | No DTI cap; APR/APOR test | Pricing-based, not DTI-based | CFPB 12 CFR § 1026.43(e)(2)(vi); 86 FR 22844 |
*Maximum DTI requires compensating factors per the cited source: high credit score, cash reserves, or an automated underwriting Approve / Eligible finding. For VA there is no stated maximum ratio: above 41 percent the file needs a supervisor's written justification, which 38 C.F.R. § 36.4340(c)(3) waives when residual income exceeds the regional guideline by at least 20 percent.
What Counts as Debt (and What Does Not)
Per Fannie Mae Selling Guide B3-6-05 (Monthly Debt Obligations) and FHA Handbook 4000.1 Section II.A.5.a.iv.
Counts Toward DTI
- + Car loans and lease payments
- + Student loans (no reported payment: Fannie 1% of balance or amortizing payment / Freddie 0.5% of balance)
- + Credit card minimum payments
- + Personal loans
- + Child support and alimony
- + Other installment debts on credit report
- + Co-signed loans (counts as your debt per Fannie B3-6-05)
Does NOT Count Toward DTI
- - Utilities (electric, gas, water)
- - Cell phone bill
- - Car insurance
- - Health insurance premiums
- - Groceries and food
- - Streaming and subscriptions
- - Current rent (replaced by mortgage)
Compensating Factors That Allow Higher DTI
These are the factors underwriters weigh when a file sits above the base ratios. FHA lists them as compensating factors for manual underwriting (Mortgagee Letter 2014-02, now Handbook 4000.1 Section II.A.5.d); Desktop Underwriter weighs reserves and credit inside its own risk assessment:
Cash Reserves
Savings left after closing. FHA counts verified reserves of at least three total monthly mortgage payments (one or two units) or six (three or four units) as a compensating factor (Mortgagee Letter 2014-02). For Fannie Mae, reserves feed the Desktop Underwriter assessment and the manual-underwriting Eligibility Matrix.
Credit Score
Strong credit history. For a manually underwritten Fannie Mae loan, the credit score and reserves in the Eligibility Matrix are what allow a DTI above 36%, up to 45% (Selling Guide B3-6-02).
Minimal Payment Shock
On FHA manual files, the new total mortgage payment is no more than $100 or 5% above the previous housing payment, whichever is less, with a 12-month housing payment history showing no more than one 30-day late payment (Mortgagee Letter 2014-02).
Significant Residual Income
Money left after all debts and living expenses. VA sets regional minimums by family size in the table of residual incomes by region at 38 C.F.R. § 36.4340(e)(2), and clearing them by 20 percent removes the second-level review on a file above 41 percent DTI. For other loan types, high residual income can override DTI concerns.
How to Lower Your DTI Before Applying
Pay off the smallest debts first
A $3,000 credit card with a $90/month minimum reduces your DTI more per dollar spent than paying down a $30,000 student loan. Eliminating that $90/month leaves $90 more of the back-end limit for the mortgage payment.
Increase your documented income
Per Fannie Mae Selling Guide B3-3.1 (Income Verification), supplemental income must be documented for 24 months to count toward qualifying income. Start documenting overtime, bonus, freelance, or side income now if you plan to apply later.
Ask about debts with fewer than 10 payments remaining
Fannie Mae Selling Guide B3-6-05 allows lenders to exclude installment debts with fewer than 10 payments remaining from DTI. If your car loan has 8 payments left, ask if it can be excluded.
Be cautious with debt consolidation
Consolidating high-rate cards into a personal loan can lower monthly minimums (reducing DTI), but opening a new account affects your credit score per FICO scoring methodology. Do this 6+ months before applying to let the credit-score impact recover.