DSCR vs LTV: Which Constraint Sizes Your Loan
By Devon Coombs, CPA, MBA · Teaching Professor of Finance, Santa Clara University · Reviewed August 2026
LTV caps the loan as a percentage of property value, while DSCR caps it by requiring NOI to cover debt service with a cushion. Lenders typically run both tests and lend to whichever produces the smaller loan. When cap rates are low or interest rates are high, the DSCR test generally binds first, so borrowers should size proceeds from income coverage rather than the LTV headline.
| DSCR | LTV | |
|---|---|---|
| Formula | NOI ÷ annual debt service | Loan amount ÷ property value |
| What it protects | The lender's ongoing payment stream | The lender's recovery if the property is sold |
| Keyed to | Property income | Appraised value |
| Typical requirement | Minimums often near 1.20x to 1.30x | Commonly 55 to 75 percent depending on lender and property type |
| Sensitive to | Interest rate, amortization, and NOI | Appraisal conclusions and market pricing |
| Tends to bind first | When cap rates are low or rates are high | When cap rates are high relative to the loan constant |
When DSCR is the right tool
DSCR is the constraint to model first whenever debt service is expensive relative to income, which describes most low cap rate assets and most high rate environments. Working the test backward converts income directly into proceeds, since maximum annual debt service equals NOI divided by the required coverage ratio, and dividing that payment by the loan constant yields the loan amount. Coverage is also the covenant lenders watch through the hold, so underwriting to a thin cushion invites trouble if NOI slips.
When LTV is the right tool
LTV governs when the property is priced at a high cap rate relative to the loan constant, since income could then support more debt than the lender will advance against value. It also frames appraisal risk, because a low appraisal cuts proceeds even when coverage is comfortable. When comparing lenders, the advertised maximum LTV matters less than which test actually binds at that lender's rate, amortization, and DSCR minimum.
The common mistake
Borrowers routinely back into an expected loan from an advertised 70 percent LTV and are surprised when the term sheet arrives meaningfully lighter. The gap appears because the lender ran both tests and the coverage-constrained loan was smaller, which happens whenever the cap rate sits low relative to the mortgage constant. Sizing the capital stack off the LTV headline alone tends to overstate proceeds and forces a late scramble for gap equity. Running the coverage math first avoids the surprise.
Work the numbers yourself
Both concepts are taught in depth, with practice questions, in the free Real Estate Finance course.