Calculating Debt Service Coverage Ratio can help a real estate investor quickly evaluate whether a rental property's income appears capable of supporting proposed financing. The formula is straightforward, but the inputs matter.
What DSCR Measures
Debt Service Coverage Ratio is a property-cash-flow measure used in investment-property lending. DSCR compares qualifying property income with the qualifying property debt obligation.
DSCR = Qualifying Property Income / Qualifying Property Debt Obligation
A ratio above 1.00 indicates income exceeds the debt obligation. Below 1.00 indicates a shortfall.
Simple DSCR Example
Assume a lender uses $3,000 in qualifying monthly rent and a $2,400 qualifying monthly debt obligation. Dividing $3,000 by $2,400 produces a DSCR of 1.25. The arithmetic is simple. The underwriting challenge is determining which income and debt inputs the lender will accept.
What Counts as Qualifying Income?
Depending on the lender and transaction, qualifying income may be based on an existing lease, appraiser-supported market rent, or another eligible rental-income methodology. Do not assume the highest projected rent in your spreadsheet will be the lender's qualifying rent.
What Counts as the Debt Obligation?
The denominator may include principal, interest, property taxes, insurance and association dues or other housing expenses, depending on the program. Investors should confirm what the lender includes rather than comparing ratios calculated on different bases.
How Rent Changes DSCR
Holding the debt obligation constant, higher qualifying rent increases DSCR and lower qualifying rent decreases it. This makes realistic rent analysis important before an investor commits to a purchase or refinance strategy.
How Financing Terms Change DSCR
Holding rent constant, a larger debt obligation reduces DSCR. Loan amount, interest rate, amortization and property expenses can therefore influence the ratio.
Monthly vs. Annual Calculations
DSCR can be expressed using monthly or annual inputs as long as both sides use the same period and the lender's methodology is followed.
Common DSCR Calculation Mistakes
- Using projected rent instead of lender-supported qualifying rent
- Leaving out taxes, insurance or association dues when the lender includes them
- Mixing monthly and annual figures
- Assuming every lender uses the same DSCR methodology
- Treating the ratio as the only underwriting requirement
Using DSCR Before Requesting Financing
A preliminary DSCR calculation is useful for screening a deal and identifying whether rent or debt is likely to be the constraint. It should be treated as an estimate rather than a guaranteed approval calculation.
How Landlord Lending Helps
Landlord Lending can review the property, rental-income information and financing objective and help identify lender options whose underwriting approach fits the scenario.
Related: DSCR Loan Requirements for Real Estate Investors · What Is a Good DSCR Ratio?
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What does a 1.25 DSCR mean?
In a simplified calculation, it means qualifying income is 1.25 times the qualifying debt obligation.
Is a higher DSCR better?
All else equal, a higher ratio indicates more income relative to the debt obligation, but lenders evaluate the entire transaction.
Can DSCR be below 1.00?
Yes mathematically. Whether a lender will finance that scenario depends on its program and other deal factors.
Should I use monthly or annual numbers?
Either can work if both income and debt use the same period and the lender's methodology is followed.