How DSCR Is Calculated, Including the Appraisal Rent Schedule

The formula

DSCR stands for debt service coverage ratio. For a residential rental loan it is the property's gross monthly rent divided by its full monthly housing payment: principal, interest, taxes, insurance and any association dues, usually abbreviated PITIA.

DSCR = gross monthly rent ÷ monthly PITIA

A ratio of 1.00 means the rent exactly covers the payment. Above 1.00 the property produces more than its payment; below 1.00 it produces less. Lenders set their own minimum ratios and pricing tiers around them, and those vary by lender and program. What does not vary is the arithmetic, and getting both inputs right is where the surprises hide.

The numerator: the rent the lender will use

The rent in the formula is the rent the lender accepts, which is not always the rent you collect or expect to collect. Four cases cover most files.

Leased property

If the property has a tenant, the executed lease is the starting point, usually supported by evidence that rent is actually being paid, such as recent deposits or a rent ledger. Most lenders also order a rent analysis from the appraiser and compare the two figures.

The appraisal rent schedule

Fannie Mae's appraisal forms include a rent analysis that non-QM lenders have adopted as the standard. For a single-unit property that has historically been the Single-Family Comparable Rent Schedule, Form 1007, which estimates market rent from comparable rentals nearby; for a two- to four-unit property the rent schedule is part of the Small Residential Income Property Appraisal Report, Form 1025. The agencies are replacing those numbered forms with a single dynamic Uniform Residential Appraisal Report that carries the same comparable-rent analysis, and DSCR lenders, who are not bound to agency forms, may use either for a while. Whatever the report is called, the appraiser's market-rent figure is the lender's anchor.

Lower of lease or market

Many programs use the lower of the lease rent and the appraiser's market rent. If your lease is above market, the underwriter typically uses the market figure unless the program allows the higher lease with proof of receipt. If your lease is below market, the lease governs. Some programs tolerate a lease that exceeds market by a small margin. The tolerance varies by lender.

Vacant property

A vacant purchase, or a refinance between tenants, qualifies on the appraiser's market rent alone. Some lenders accept the figure as is. Others apply a vacancy adjustment or require a higher ratio when there is no lease in hand, because a projection is weaker evidence than a paying tenant. A newly signed lease for a unit that has not yet been occupied is often treated differently from one with a payment history.

Short-term rentals

Nightly-rental income is documented differently where a program allows it at all, typically through platform statements or a specialized appraisal analysis, and it is often discounted. If the property is a short-term rental, confirm the program's treatment before you rely on a projected number. For how platform history is documented and discounted, see DSCR loans for Airbnb and short-term rentals.

The denominator: the full payment

PITIA is the whole housing cost, not just the loan payment.

• Principal and interest on the proposed loan at the program's terms.
• Property taxes, generally based on the current bill or the lender's estimate where taxes will reset at the purchase price.
• Hazard insurance, plus flood insurance where the property requires it.
• Association dues for a condominium or planned community, when they apply.

Nothing else goes in. Vacancy, maintenance, management, utilities you pay and capital reserves are excluded from the lender's ratio, which is why the ratio overstates true cash flow. A property that clears a lender's minimum can still lose money after those costs. The ratio answers the lender's question, not yours.

An illustrative example

For illustration, suppose a single-family rental is leased at $2,400 a month and the appraiser's rent schedule estimates market rent at $2,500. Under a lower-of rule, the lender uses $2,400.

Suppose, still for illustration, that the proposed principal-and-interest payment is $1,500, property taxes are $300 a month, insurance is $125 a month and there are no association dues. PITIA is $1,925. DSCR is 2,400 divided by 1,925, or about 1.25. The rent covers the payment with a cushion of roughly a quarter of the payment.

Now suppose the buyer chooses a smaller down payment and principal and interest rise to $1,700 in this example. PITIA becomes $2,125 and the ratio falls to about 1.13. Push PITIA to $2,500 and the ratio drops to 0.96, below break-even. Every one of those moves is illustrative. The point is that the ratio is sensitive to both inputs, and the loan amount is the lever the borrower controls most directly.

The interest-only variant

Some DSCR programs offer an interest-only period, and some of those calculate the ratio using the interest-only payment rather than the fully amortizing one. Because the interest-only payment is smaller, the ratio is higher for the same property.

Continuing the illustration: if the interest-only payment on the same loan were $1,150 instead of $1,500, PITIA would be $1,575 and the ratio about 1.52. The property has not changed. The ratio has. Two consequences follow. A property that fails the fully amortizing test may pass the interest-only test, which some programs use deliberately as a qualifying tool. And the cushion the ratio shows disappears when the interest-only period ends and the payment steps up, so an investor should underwrite the amortizing payment even when the lender does not. The DSCR calculator has an interest-only switch so you can see both ratios for the same property.

How to read your own number

• At or above break-even, the property covers its lender-defined payment. Whether it covers its real costs is a separate calculation you owe yourself.
• Below break-even is not automatically a decline. Depending on the lender, some programs price for it, some require a larger down payment or more reserves, and some decline.
• A higher ratio generally reaches better pricing tiers. Lowering the loan amount is the direct way to raise it.
• The rent used is the lender's rent. Do not underwrite on a number the appraiser has not seen.

What to do next

Run your own inputs through the DSCR calculator, using the lease or a realistic market rent, and the full PITIA rather than the loan payment alone. Test the ratio at a couple of loan amounts to see how much the down payment moves it.

The DSCR loan page covers the program itself. If you plan to hold the property in an entity, DSCR loan in an LLC explains vesting, the personal guarantee and the document list.

The real estate investors hub compares the investor programs side by side.

When you have a property in mind, send us the address and the lease. We estimate the ratio the way an underwriter will, including the rent the appraiser is likely to support, before you commit to a program.