DSCR Loans

How to Calculate DSCR for Rental Property Loans in 2026: Formula + Examples

Pinnacle Funding Network · June 2026

Published by James Loffredo | June 2026 | 9 min read

The debt service coverage ratio is the one number every DSCR loan turns on, and it is genuinely simple to calculate. The trouble is never the division. It is knowing which rent figure and which expenses a lender actually uses, because the DSCR you run at the kitchen table is often a tenth or two higher than the one underwriting produces. This guide gives you the formula, three worked examples across different property types and states, the way lenders calculate it differently than you do, and the mistakes that quietly inflate your number.

If you would rather skip the arithmetic, our DSCR calculator runs the same math instantly. But it is worth understanding what sits underneath it before you put an offer on a property.

The DSCR Formula

The formula is one line:

DSCR = monthly rent / monthly PITIA

PITIA is principal, interest, taxes, insurance, and association dues. Rent goes on top, the full carrying cost goes on the bottom, and the result is a ratio. A property renting for 2,400 dollars a month with a 2,000 dollar PITIA carries a 1.20x DSCR, which means the rent covers the payment with a 20 percent cushion. A 1.00x ratio means rent exactly equals the payment. Below 1.00x, the rent does not fully cover the payment.

Some lenders express the same thing annually, dividing annual rent by annual debt service, but the ratio comes out identical. Whichever way you frame it, the work is in the two inputs, not the division.

What Goes Into PITIA, the Denominator

Most investors quote principal and interest from a mortgage calculator and stop there. A DSCR lender uses the full PITIA, and the three letters people forget are exactly where deals get tight.

Principal and interest come from the loan amount, the rate, and a 30-year amortization in most cases. Taxes are based on the reassessed value at your purchase price, which in high-tax states can run well above what the current owner pays. Insurance is the actual bound premium, and in wind or flood markets that premium can be the largest non-debt line on the page. Association dues, the final A, apply to condos and many planned communities. Leave out taxes, insurance, or HOA and your DSCR will look healthier than the file the lender builds.

Worked Example 1: Florida Single-Family Rental

Start with the cleanest case, a long-term single-family rental in Florida.

The file. Purchase price 300,000 dollars. The investor puts 20 percent down (60,000 dollars) for a 240,000 dollar loan at roughly 7.25 percent over 30 years. The home rents for 2,400 dollars a month on a signed lease.

The math. Principal and interest on 240,000 dollars run about 1,637 dollars. Add 275 dollars in monthly property taxes (the reassessed figure at the purchase price) and 200 dollars for Florida insurance, with no HOA, and PITIA totals roughly 2,112 dollars. Divide the 2,400 dollar rent by the 2,112 dollar PITIA and the DSCR is 1.14x.

The lesson. That clears the 1.00x minimum with a real cushion, and Florida insurance is the line to watch. Drop the insurance number in by 100 dollars and the ratio moves; that is why a bound quote matters more than an estimate in coastal markets like West Palm Beach.

Worked Example 2: Tennessee Short-Term Rental

Now a short-term rental, where the rent input works differently. Take a cabin in the Gatlinburg area underwritten on projected revenue.

The file. Purchase price 400,000 dollars, 25 percent down for a 300,000 dollar loan at roughly 7.75 percent (short-term rental rates run a touch higher) over 30 years. Principal and interest are about 2,149 dollars. Add 233 dollars in Tennessee property taxes and 300 dollars for the higher short-term rental insurance, no HOA, and PITIA is roughly 2,682 dollars.

The math, done right. An Airbnb data report might show gross revenue near 5,100 dollars a month. If you used that gross figure you would calculate a 1.90x DSCR and feel great. But the lender applies a short-term rental methodology with a vacancy and management adjustment, landing on a qualifying figure closer to 3,350 dollars a month. Divide 3,350 by 2,682 and the real DSCR is 1.25x. Still strong, but a full point lower than the gross number suggested.

The lesson. For short-term rentals, always model the lender's qualifying revenue, not the gross projection. Our STR lending page covers which revenue methodologies different lenders accept.

Worked Example 3: Texas Duplex

Finally a multi-unit property in a high-tax state, a duplex in Texas.

The file. Purchase price 350,000 dollars, 20 percent down for a 280,000 dollar loan at 7.25 percent over 30 years. Both units rent for 1,500 dollars, so gross rent is 3,000 dollars a month. Principal and interest are about 1,910 dollars.

The math. Here is where Texas bites. Property taxes near 2.0 percent of value add about 583 dollars a month, far more than the Florida example on a similar price. Add 150 dollars in insurance, no HOA, and PITIA totals roughly 2,643 dollars. Divide the 3,000 dollar rent by the 2,643 dollar PITIA and the DSCR is 1.13x.

The lesson. The deal still works, but the property tax line is the swing factor in Texas, and it is the input investors most often understate by using the seller's older tax bill. Underwrite the reassessed number at your purchase price or your DSCR will be wrong in the wrong direction.

How Lenders Calculate DSCR Differently Than You Do

Three adjustments separate your kitchen-table number from the underwritten one, and knowing them up front saves a surprise.

Rent. For a long-term rental the lender uses the lesser of your signed lease or the appraiser's market rent on Form 1007. If you bought below market and the tenant is on an old lease, the lower figure governs. For a short-term rental the lender uses a projected revenue methodology, often with its own vacancy and management haircut.

Taxes. The lender underwrites the reassessed tax at your purchase price. In states like Texas that can be hundreds of dollars a month above the seller's bill, and it is the single most common reason an investor's DSCR comes in high.

Insurance. The lender uses the actual bound quote, including wind and flood where required, not a placeholder estimate. Build the real quote into PITIA before you calculate.

Common DSCR Calculation Mistakes

Most DSCR miscalculations are not math errors, they are input errors. The frequent ones:

Using gross short-term rental revenue instead of the lender's qualifying figure, which overstates STR ratios the most. Forgetting HOA or condo dues, which belong in PITIA. Using the seller's old property tax instead of the reassessed amount at your price. Quoting principal and interest only and leaving out taxes, insurance, and association dues entirely. And using an insurance estimate rather than a bound quote in wind or flood markets. Each of these pushes your DSCR up, which feels good right until underwriting corrects it.

How to Calculate DSCR, Step by Step

Putting it in order: first, establish the qualifying monthly rent, using the lesser of the lease or the Form 1007 market rent for a long-term rental, or a projected figure for a short-term rental. Second, total the monthly PITIA with the reassessed taxes and the actual insurance quote. Third, divide rent by PITIA to get the ratio. Fourth, measure it against the 1.00x minimum, aiming for a 1.15x to 1.25x cushion. Fifth, stress-test the inputs at a higher rate and a conservative rent, then confirm with a lender so your number matches the underwritten number.

Run the scenarios on our DSCR calculator, then get a quote from our lending team to convert the math into your exact rate and terms.

Frequently Asked Questions

What is the DSCR formula? Monthly rent divided by monthly PITIA (principal, interest, taxes, insurance, and any HOA dues). A 2,400 dollar rent against a 2,000 dollar PITIA is a 1.20x DSCR. Annual rent divided by annual debt service yields the same ratio.

What is PITIA in a DSCR calculation? Principal, interest, taxes, insurance, and association dues, the full monthly carrying cost in the denominator. Taxes use the reassessed value at your purchase price, insurance is the actual quote, and HOA dues apply to condos and many communities. Omitting taxes, insurance, or HOA inflates your DSCR.

Should I use gross or net rent to calculate DSCR? For long-term rentals, the gross scheduled rent, specifically the lesser of the lease or the Form 1007 market rent. For short-term rentals, a projected revenue figure that often includes the lender's vacancy and management adjustment. Using a full gross Airbnb projection overstates an STR DSCR.

What DSCR ratio do I need to qualify in 2026? A 1.00x minimum on standard programs, with 1.15x to 1.25x giving a healthy cushion. Sub-1.00x programs exist with some lenders down to 0.75x, but they require a larger down payment, a higher rate, and more reserves.

How do lenders calculate DSCR differently than investors? Lenders use the lesser of lease or Form 1007 rent, the reassessed tax at your purchase price, and the actual bound insurance quote. Those adjustments are why the underwritten DSCR is often a tenth or two below the one investors run themselves.

How do you calculate DSCR for a short-term rental? Start with projected annual revenue, convert it to a monthly qualifying figure the lender accepts, build PITIA with the higher STR insurance, and divide. Confirm which revenue methodology your lender uses, because it moves the ratio more than any other input.

Next Steps

Calculating DSCR is simple division once the two inputs are right: the qualifying rent on top and the full PITIA on the bottom. Get the rent figure and the reassessed taxes correct, include insurance and HOA, and your number will line up with the lender's. The three examples above show how the same formula behaves differently across a Florida rental, a Tennessee short-term rental, and a high-tax Texas duplex.

Model your own deal on the DSCR calculator, read the companion guides on DSCR requirements and down payment and the full DSCR loan program, and when you are ready, get a quote from our lending team for your exact numbers.

This article is for informational purposes only and is not a commitment to lend. Rates, terms, and programs are subject to change.