Debt Coverage Ratio Calculator
Lender loan coverage check.
Calculate debt service coverage ratio (DSCR) from net operating income and annual debt service. Free calculator with the working shown and a worked example.
What this tool does
This tool calculates DSCR from net operating income and annual debt service.
Enter Values
Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
The debt service coverage ratio (DSCR) compares operating income to debt payments. Divide net operating income (NOI) by annual debt service. A DSCR of 1.25 means income covers debt payments by 25% margin. Lenders typically require minimum 1.20-1.25 for commercial loans; 1.40-1.50 for riskier property or business loans.
250k NOI against 200k annual debt service = 1.25 DSCR. Cushion is 50k - income can drop 20% before default. At 1.5 DSCR (same NOI, 167k service), cushion widens to 83k - income can drop 33% before breaching. Lenders price loans based on DSCR: higher DSCR means lower interest rates and more borrowing capacity.
DSCR below 1.0 means operating income doesn't cover debt payments - the business is losing money even before tax and owner draws. Banks call these loans immediately for breach, or restructure with stricter terms. Before taking a new loan, model DSCR under stress scenarios (20% revenue drop, 10% cost rise) to see if cover stays above 1.0.
A worked example
Try the defaults: net operating income of 250,000, annual debt service of 200,000. The tool returns 1.25. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.
What moves the number most
The result responds to Net Operating Income and Annual Debt Service. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.
The formula behind this
DSCR = NOI ÷ annual debt service. Cushion = NOI - debt service. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.
What the score tells you
Headline financial numbers — income, savings, debt — each tell part of the story. This calculation stitches several together into a single read you can track over time. The value is in the direction, not the absolute number.
What this doesn't capture
The score is a composite of the inputs you provide. Life context — job security, family obligations, health, housing — doesn't appear in the math but shapes the real picture. Use the number as a prompt, not a verdict.
£250,000 £ NOI ÷ £200,000 £ debt service = 1.25.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
DSCR = NOI ÷ annual debt service. Cushion = NOI - debt service.
References
Frequently Asked Questions
What DSCR do lenders require?
Is DSCR the same as debt-to-equity?
What counts as operating income?
DSCR drops below 1.0 - what happens?
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