How to Calculate DSCR on a Rental Property

DSCR, or debt service coverage ratio, is the property's rental income divided by its debt payments and carrying costs. A result of 1.00 means the rent covers the payment exactly. Above 1.00, there is cushion. Below 1.00, the property does not pay for itself on paper.

Most DSCR lenders use a version of this formula: gross monthly rent divided by PITIA. PITIA is principal, interest, taxes, insurance, and association dues (HOA), where they apply. Some lenders define it a little differently, so confirm the exact formula before you run your own numbers.

What is the basic formula?

Take the monthly rent the lender will count. Divide it by the full monthly housing payment on the new loan. That is it.

Here is a hypothetical. A single-family rental leases for $2,400 a month. The proposed payment is $1,600 in principal and interest, $350 in taxes, $120 in insurance, and $30 in HOA dues, for $2,100 total. Divide $2,400 by $2,100 and you get about 1.14.

That example is illustrative only. It is not a quote or a program term.

Which rent number does the lender use?

This is where borrowers are most often surprised. Lenders generally use the lower of two figures: the signed lease or the market rent estimate from the appraisal. The appraiser typically reports market rent on a rent schedule form. If your lease is well above market, expect the lender to use the market number. If it is below, many lenders still use the lease.

Vacant properties usually run on the appraiser's market rent. Short-term rentals are often underwritten differently, using a trailing history of bookings or a rental-income projection, so ask how your lender treats them.

Deposits, pet fees, and one-time charges are generally not counted. Rent that is not documented is rent the lender will not count.

What goes into the payment side?

The payment is based on the new loan, not your old one. Interest rate and loan amount drive the principal and interest. Interest-only periods, where offered, lower the payment and raise the ratio, but the lender may also test the ratio on the fully amortizing payment. Ask which one they use.

Taxes and insurance are the inputs people underestimate. Taxes can reset after a purchase, since some counties reassess at sale price. Insurance quotes in coastal or storm-prone areas can come in well above what the seller paid. Use real quotes, not last year's bill.

Flood insurance and HOA dues belong in the payment if they apply. Leaving them out makes your ratio look better than the lender's will.

What DSCR do lenders want?

Typically, lenders look for a ratio at or above 1.00 to 1.25, though the exact minimum varies by lender, property type, and the rest of the file. Some programs allow a ratio below 1.00 with other offsets, such as lower leverage or a higher credit score. Those offsets usually cost something, in rate or in down payment. Check the current terms on the DSCR loans page rather than relying on a general range.

Leverage matters here too. LTV, or loan-to-value, is the loan amount divided by the property's value. A higher LTV means a larger loan and a larger payment, which pushes DSCR down. Sometimes the fix for a thin ratio is simply a smaller loan.

Why do DSCR deals get declined or restructured?

The common reasons are ordinary ones:

• The appraiser's market rent comes in below the lease or your projection.
• Property taxes or insurance are higher than the borrower assumed.
• The ratio lands below the program minimum at the requested loan amount.
• The lease is missing, expired, or does not match the rent you claimed.
• HOA dues were left out of the original math.

Most of these end in a restructure rather than a decline. The usual levers are a lower loan amount, a larger down payment, a different rate structure, or a different program. Each one changes your cash to close, so it helps to know the options before you submit.

What should you have ready?

A short checklist makes the calculation quick and the underwriting cleaner:

• Current signed lease, or a rent estimate for a vacant unit
• Property tax bill or county tax estimate
• Insurance quote, including flood where relevant
• HOA statement, if any
• Proposed loan amount and expected rate
• Proof of existing rent payments, such as bank deposits

Run the math at the lender's likely rent figure, not your most optimistic one. If the ratio works at the lower number, the file tends to move more smoothly. If you are weighing a purchase, you can share the property details when you start an application, and a loan officer can check the ratio against the current program guidelines.