Debt service coverage ratio is the single number most likely to kill an investment property loan. Here is how lenders calculate it, the thresholds that matter, and how to know where a deal stands before it ever reaches an underwriter.
Gross rental income minus operating expenses — taxes, insurance, management, maintenance, vacancy allowance. Debt payments are not included. Overstating NOI by ignoring vacancy or management costs is the most common reason a deal that "pencils" fails underwriting.
Every dollar of principal and interest the loan requires for the year. On many DSCR programs the lender uses the full PITIA payment — principal, interest, taxes, insurance, and association dues — which pushes the bar higher than a simple P&I estimate.
A DSCR of 1.0 means the property earns exactly its debt payments — no cushion. Most DSCR lenders want 1.20 to 1.25. Some programs accept 1.0, or below 1.0 with a lower loan-to-value and a higher rate. The ratio, not your salary, is what qualifies the deal.
Underwriters re-run the number with their own vacancy, tax, and insurance assumptions — not yours. If your deal only works with optimistic rent and zero vacancy, it fails in their model even though it passed in yours. Run the pessimistic case first.
| DSCR | What it says | Typical lender response |
|---|---|---|
| Below 1.00 | Property loses money against its debt | ✗ Declined by most programs; a few allow it with 65–70% max LTV and premium pricing |
| 1.00 – 1.19 | Covers debt with little cushion | Case-by-case; expect rate adjustments, reserves requirements, or a larger down payment |
| 1.20 – 1.24 | Meets the common minimum | ✓ Approvable at many DSCR lenders; standard terms |
| 1.25+ | Comfortable coverage | ✓ Broad lender pool, best pricing tiers, smoother underwriting |
Underlytix runs DSCR, LTV, and fundability on a deal in about 60 seconds — against real lender thresholds, not optimistic assumptions.