Debt service = annual mortgage payments (P&I). Operating expenses exclude debt.
Calculation details
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Use this result
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What does this calculator estimate?
The break-even ratio (also called the default ratio) is the share of a property's income that goes to operating expenses and debt service. Lenders use it to gauge risk; a ratio under 100% is a good default-risk signal. Enter annual debt service, operating expenses, and gross income to get yours.
- Break-even ratio = (debt + operating exp) ÷ gross income
- Under 100% = income covers debt and expenses
- Used by lenders as a risk signal
What the break-even ratio shows
The break-even ratio is the share of gross income consumed by debt service and operating expenses. At 100%, income exactly covers obligations — nothing left for profit. Lenders like it under 85% so there's a cushion for vacancy and cost increases.
Limitations to watch for
The ratio uses gross income — vacancies hit it directly. It's a lending screen, not a profit metric: it ignores the buyer's tax situation and leverage choices. Different lenders use slightly different expense definitions.
How to use it in practice
Enter annual debt service, operating expenses, and gross income. If the ratio is above 90%, a vacancy or repair can flip the property negative — budget accordingly or find cheaper financing.
['Enter annual debt service.', 'Enter annual operating expenses and gross income.', 'Read the break-even ratio.']
What the break-even ratio is
The break-even ratio compares a property's debt service plus operating expenses to its gross income: (debt + expenses) ÷ gross income. A ratio below 1 means income covers the full cost; lenders watch it closely.
The lender's view
Commercial lenders use the break-even ratio to judge risk: a ratio under 85 percent is generally healthy, above 100 percent means the property loses money before income-tax effects. The calculator returns the ratio and its zone.
A worked example
$1,400 monthly debt service plus $500 expenses against $2,000 gross rent: ratio = 1,900 ÷ 2,000 = 95 percent — tight. Raising rent to $2,100 drops it to about 90 percent. The calculator shows the sensitivity.
Relation to DSCR
The break-even ratio is the inverse family of DSCR: DSCR = NOI ÷ debt service; break-even = (debt + expenses) ÷ gross. Both measure the same capacity from different angles.
Using it in underwriting
A ratio below 1 leaves cushion for vacancy and repairs. The calculator's expense and debt inputs make the property's real cushion visible before you commit.
How this calculator works
Formula
Break-even ratio = (debt service + operating expenses) ÷ gross income × 100. Lenders use it to gauge how much of income is consumed by obligations.
Worked example
$1,400 debt service + $500 expenses = $1,900 of $2,000 gross income → 95% break-even ratio.
Assumptions to verify
- Debt service and expenses are annual totals.
- Gross income is the rent at full occupancy.
- No vacancy allowance is included.
Frequently asked questions
What is the break-even ratio?
The share of gross income consumed by debt service and expenses: $1,900 ÷ $2,000 = 95%.
How is it calculated?
(Debt service + operating expenses) ÷ gross income × 100.
What's a safe ratio?
Under 85% gives cushion for vacancy and cost increases; above 90% is thin.
Why do lenders use it?
It measures how much income is already committed — the borrower's cushion against vacancies.
How is it different from DSCR?
DSCR is income ÷ debt only; the break-even ratio includes operating expenses.
Does it include the mortgage?
Yes — debt service is the mortgage payment (principal + interest).
How do I lower it?
Refinance to lower debt service, cut operating expenses, or raise rents.
What is a healthy value?
Under 85% is typically healthy; over 100% means the property loses money.
What happens above 100%?
Gross income can't cover debt plus expenses — the owner must fund the gap.
Cite this tool
BoringToolsKit. “Break-Even Ratio Calculator.” boringtoolskit.com/break-even-ratio-calculator/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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