Quick answer
Lenders divide qualifying monthly rent by the full monthly payment (principal, interest, taxes, insurance and HOA, or PITIA). A rental earning $2,600 against a $2,300 payment has a DSCR of 1.13. In Tampa Bay, include CDD assessments in taxes and windstorm and flood premiums in insurance, or your estimate will run high.
The formula
DSCR = qualifying monthly rent ÷ full monthly payment (PITIA)
That is it. Some commercial lenders use net operating income instead of gross rent, but residential DSCR programs for one to four units generally use gross rent against PITIA. The art is in getting each input right.
Which rent counts
- Purchases: usually the appraiser’s market rent estimate, reported on a rent schedule with comparable rentals. An existing lease may be used if it transfers.
- Refinances: usually the lesser of the current lease and the appraiser’s market rent, though programs vary. Some accept a higher lease with proof of receipt.
- Short-term rentals: some programs use booking history or a market projection; others use long-term rent. See STR vs LTR.
- 2-4 units: combined rent from all units. See 2-4 unit loans.
What goes into the payment
| Line | What to include in Tampa Bay | Common mistake |
|---|---|---|
| Principal and interest | From the quote for your actual loan amount and term | Using a payment from a different loan amount |
| Taxes | Ad valorem tax without homestead, plus CDD and other non-ad valorem assessments | Using the seller’s homestead-capped bill |
| Insurance | Landlord policy, windstorm (if separate) and flood (if required or carried) | Forgetting the separate wind or flood policy |
| Association dues | HOA and/or condo dues | Leaving out dues in planned communities |
Some programs offer interest-only periods, which change the principal and interest line. Ask how the program calculates the qualifying payment if you are considering one.
Reading the result
| DSCR | What it means |
|---|---|
| Above 1.25 | Rent covers the payment with a solid cushion; the widest range of programs |
| 1.00 to 1.25 | Rent covers the payment; many programs work here |
| 0.75 to 0.99 | Rent falls short; some programs consider it with stronger credit, reserves or equity |
| Below 0.75 | Large shortfall; usually needs a smaller loan, lower costs or higher rent |
General orientation only. Each lender sets its own minimum ratio and requirements.
Full worked example
Hypothetical inputs for a Riverview-area home. Market rent: $2,600. Principal and interest from the investor’s own quote: $1,560. Ad valorem tax without homestead: $4,560 a year, or $380 a month. CDD: $1,200 a year, or $100 a month. Landlord policy with wind: $2,640 a year, or $220 a month. No flood required. HOA: $40 a month.
Full payment: $1,560 + $380 + $100 + $220 + $40 = $2,300. DSCR: $2,600 ÷ $2,300 = 1.13. If the same home required a flood policy at $120 a month, the payment would be $2,420 and the DSCR about 1.07.
Ways to improve the ratio
- Lower the insurance line: wind mitigation inspection, elevation certificate, shopping carriers. See wind mitigation.
- Reduce the loan amount: a larger down payment or less cash out lowers principal and interest.
- Support higher rent: a signed lease at market, or improvements the appraiser can credit.
- Choose the right program: programs treat rent, STR income and interest-only differently, which is the reason to use a broker that shops wholesale lenders.
How a lender’s numbers can differ from yours
Investors are sometimes surprised when a lender’s ratio comes in lower than their own spreadsheet. The usual reasons are predictable. The appraiser’s market rent may be lower than the asking rent you expected. The lender may use the lower of the lease and market rent on a refinance. The tax line may be recalculated on the purchase price without homestead, and the CDD line added if it was missing. The insurance line will reflect the actual binder, including a separate wind policy or a required flood policy you had not priced yet.
None of those is a trick; each simply replaces an estimate with a documented figure. The best defense is to build your own estimate the way the lender will, with conservative rent, the full tax bill and real insurance quotes, so the final ratio confirms your numbers instead of contradicting them.
Beyond the ratio
DSCR is the headline, not the whole file. Lenders also review credit, reserves, the appraisal and condition, insurance binders, and title or LLC documents. Our DSCR loans page covers the full picture, and the calculator does the arithmetic for you.
Questions investors ask
What DSCR do I need?
It depends on the program. Many look for 1.00 or higher, meaning rent covers the full payment, and some consider lower ratios with compensating factors like stronger credit, more reserves or more equity.
Does DSCR use gross rent or net income?
Most residential DSCR programs for one to four units use gross monthly rent against the full PITIA payment. Commercial loans on larger buildings often use net operating income instead.
Have a Tampa Bay rental in mind?
Send the address, rent and insurance quotes. We check flood, wind and storm history first, then compare wholesale DSCR programs.