Expense Ratio Formula
The expense ratio formula divides annual operating expenses by effective gross income. It helps compare operating load, but it can mislead if income or expenses are incomplete.
Estimates are based on your inputs and assumptions. DealSharp does not provide financial, investment, legal, tax, or lending advice.
Run the number, then pressure-test the assumptions.
The expense ratio formula divides annual operating expenses by effective gross income. It helps compare operating load, but it can mislead if income or expenses are incomplete.
Use this page to understand the metric directionally, then compare it against financing, reserves, repair risk, cash flow, and your own constraints.
Expense ratio = annual operating expenses / effective gross income
If annual operating expenses are $15,000 and effective gross income is $40,000, expense ratio is 37.5%.
Use the formula inside a full deal model
DealSharp helps compare assumptions, debt service, cash flow, and risk flags so this metric is not reviewed in isolation.
Open DealSharpHow to read this number
The useful move is not treating one number as a final answer. Use it to decide which assumptions deserve more review, then compare the result against cash flow, financing, reserves, repair risk, and your own constraints.
Inputs required
- Annual operating expenses.
- Effective gross income.
- Consistent treatment of vacancy and owner-paid costs.
Outputs explained
- Expense ratio percentage.
- Operating load relative to income.
- Context for NOI review.
Assumptions to review
- Debt service is excluded.
- Effective gross income accounts for vacancy or credit loss.
- Operating expense categories are complete enough for comparison.
What this tells you
- Expense ratio shows how much income is used by operations.
- It can compare similar rental properties quickly.
- It helps flag expense assumptions that need more review.
What this does not tell you
- Expense ratio does not show debt service or cash flow.
- It can look low when repairs or reserves are understated.
Common mistakes
- Using scheduled gross rent instead of effective gross income.
- Leaving out property management or reserves.
- Comparing different asset types without context.
FAQ
Does expense ratio include vacancy?
Vacancy is usually reflected in effective gross income rather than operating expenses.
Why does expense ratio matter for NOI?
NOI depends on income after operating expenses, so expense ratio helps explain how much income is being consumed.
Run the full deal before deciding
This page helps with one metric or workflow. DealSharp is built for full real estate deal analysis: assumptions, financing, cash flow, repair scenarios, DSCR, cap rate, and risk flags based on your inputs.
Open DealSharpDisclaimer
DealSharp provides calculation and scenario-modeling tools for informational purposes only. Outputs are estimates based on your inputs and assumptions. DealSharp does not provide financial, investment, legal, lending, tax, or accounting advice. Verify important decisions with qualified professionals.