Between DTI 43 and DTI 45, something breaks. Not gradually — suddenly. Each lender has a threshold where denial rates jump. Slide to find yours.
Source: 545,194 loan-level FHA applications with exact-integer DTI (CFPB HMDA 2023–2025). Cliff locations validated across all three years.
The cliff is institutional, not mathematical. FHA guidelines allow DTI up to 57% with compensating factors. But each lender imposes its own overlay — an internal threshold where their decision engine shifts. DTI 44→45 is not a federal rule. It's a lender choice. And it's different at every lender.
If your DTI is 44 and a lender's cliff is at 45, you're safe — barely. If your DTI is 46 and the cliff is at 45, you've crossed it. The same income, the same debts, one extra monthly payment pushes you over.
Mr. Cooper shows almost no cliff — its denial rate barely changes across the DTI range. CrossCountry's cliff sits one step later (45→46) — its own institutional line, three years running. Rocket's cliff is sharp and unforgiving.
This isn't just our finding. A 2026 Federal Reserve Bank of St. Louis working paper analyzing over 30 million HMDA applications (2018–2024) found a comparable nonlinearity at the market level — denial rates jump 15–17 percentage points once DTI crosses 50%, calling it "the functional market boundary." Their cliff sits at a higher DTI than ours because they measure the aggregate market; we measure each lender's own internal threshold. Some lenders evidently impose a stricter line years before the market-wide wall appears — which is exactly what this page's lender-by-lender breakdown is built to show. Garcia & Garriga, "The Determinants of Mortgage Denial," St. Louis Fed Review, Q2 2026.
Prices and rates are widely reported. Whether a lender says yes is not. In the complete 2025 federal record, denial rates across the 100 largest FHA lenders ran from 1.8% to 78.7% — same programme, same year.
And it is not simply who applies where: standardizing on state, loan amount, income, debt-to-income and loan-to-value, applicant mix explains only a 2.7× range in expected outcomes.
CFPB HMDA 2025, computed by FinanceRateCalc. Covers the highest-volume lenders published per market, not all lenders. Historical observations, not predictions. CC BY 4.0, not independently reproduced.