Debt Service Coverage Ratio (DSCR) Calculator
The debt service coverage ratio is the primary metric lenders use to evaluate whether a rental property or business generates sufficient income to cover its debt obligations. A DSCR above 1.00 indicates that income exceeds debt payments, providing a financial cushion. Lenders typically require a minimum DSCR of 1.20 to 1.25 to approve investment property loans, ensuring the property can withstand temporary income losses without the owner being unable to service the debt. This calculator works for both rental property analysis and personal finance: enter your monthly gross income and operating expenses to determine your net operating income, then enter your total monthly debt service to get your DSCR. The result tells you whether you qualify for typical DSCR mortgage products and how much additional debt capacity you have.
DSCR formula
NOI = Gross Income - Vacancy - Operating Expenses
DSCR = NOI / Monthly Debt Service
Assessment: DSCR < 1.00 = insufficient income; 1.00-1.24 = marginal; 1.25+ = lender threshold met
DSCR interpretation
- DSCR below 1.00: income does not cover debt payments. The property operates at a cash flow deficit.
- DSCR of 1.00: income exactly equals debt service (break-even with zero cushion).
- DSCR of 1.20-1.24: income exceeds debt by 20-24%. Some lenders may approve; check specific requirements.
- DSCR of 1.25 or higher: typical minimum for most investment property lenders and DSCR mortgage programs.
- DSCR of 1.50 or higher: strong coverage, typically meets requirements for the best loan terms.
DSCR: frequently asked questions
What is the debt service coverage ratio?
The debt service coverage ratio (DSCR) measures whether income is sufficient to cover debt payments. For rental properties, DSCR equals Net Operating Income (NOI) divided by Total Annual Debt Service (principal + interest). A DSCR of 1.25 means net income is 25% greater than the debt payments. Lenders use DSCR to determine whether a property or borrower generates enough cash flow to service proposed debt.
What DSCR do lenders typically require?
For investment properties, most commercial lenders require a minimum DSCR of 1.20 to 1.25. This ensures a cushion above 1.00 (break-even) to account for vacancies, unexpected expenses, or income declines. Residential DSCR loans (a type of non-QM loan where the property cash flow qualifies instead of personal income) often require a minimum DSCR of 1.00 to 1.25.
What is net operating income (NOI)?
Net Operating Income is the income generated by a property after deducting operating expenses (management fees, maintenance, property taxes, insurance, utilities), but before deducting debt service (mortgage payments) and income taxes. NOI = Gross Rental Income - Vacancy - Operating Expenses. NOI does not include mortgage payments or capital expenditures.
How does DSCR differ from debt-to-income ratio?
The debt-to-income (DTI) ratio is used for consumer mortgages: it compares total monthly debt payments to gross monthly income. The DSCR is used for commercial real estate and investment property underwriting: it compares net operating income to total annual debt service. A DSCR above 1.00 is good (income exceeds debt); a DTI below a threshold (typically 43%) is good.
Can I use DSCR for personal finance?
Yes. A personal DSCR adapts the same concept: divide your monthly take-home income by your total monthly debt payments (mortgage, car, student loans, credit cards). A personal DSCR above 1.00 means you have surplus income after debt; below 1.00 means debt payments exceed income. Many financial planners recommend a personal DSCR of at least 1.25 (debt uses no more than 80% of income).
Official sources
- Consumer Financial Protection Bureau: What is a Debt-to-Income Ratio?
- Fannie Mae: Selling Guide - Rental income and DSCR requirements.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.