50% Rule Calculator
Estimate net operating income (NOI) in seconds. The 50% rule assumes operating expenses run about half of gross rent — a fast way to triage rental properties before pulling actual tax and insurance numbers.
Property Details
The 50% rule estimates that operating expenses run about half of gross rent — before mortgage payments.
Add price to see an implied cap rate.
Estimated NOI
estimated NOI per year
What is the 50% rule?
The 50% rule is a quick estimate: roughly half of a rental property’s gross rent will be eaten by operating expenses (taxes, insurance, maintenance, vacancy, capex, management). What’s left is your estimated NOI — the cash you have to cover the mortgage and produce profit.
The formula
When 50% is too low
- Older properties with deferred maintenance.
- High-tax states (NJ, IL, NY, TX) where property tax alone is 2–3% of value.
- Class C/D rentals with higher turnover and tenant damage.
- Single-family homes managed by a property manager (10% of rent off the top).
When 50% is too high
- New construction in low-tax states (FL, TN, NV).
- Self-managed rentals with no management fee.
- Multifamily where economies of scale spread fixed costs.
Frequently asked questions
What is the 50% rule in real estate?
The 50% rule says about 50% of a rental property’s gross rent will go to operating expenses (taxes, insurance, maintenance, vacancy, capex, management) before mortgage payments. The remaining 50% is your estimated NOI.
What does the 50% rule include?
It includes everything except principal and interest on a mortgage: property taxes, insurance, maintenance, repairs, capital expenditures, vacancy loss, and property management. It does NOT include the loan payment itself — NOI is unlevered.
Is 50% accurate for operating expenses?
It’s a rough average. Newer properties in low-tax states with low vacancy can run 30–40%. Older Class C/D properties in high-tax states with high turnover can run 55–65%. Use 50% as a starting point and refine with actual taxes, insurance, and historical operating data.
How is the 50% rule different from the 1% rule?
The 1% rule screens whether rent is high enough relative to price (rent ÷ price ≥ 1%). The 50% rule estimates how much of that rent will survive after expenses. They’re complementary: 1% rule for the price-to-rent screen, 50% rule for the rough NOI estimate.
Can I use the 50% rule for multifamily and commercial?
Yes — and many commercial pros use it as a sanity check on operating expense ratios. For larger multifamily, 40–50% is typical. For NNN commercial leases, expenses are passed through to the tenant, so the ratio is much lower (10–15%).
Why does the 50% rule exist if you can just calculate real expenses?
For triage. When you’re screening 20+ properties, you don’t have time to pull actual taxes and insurance quotes for each one. The 50% rule gets you to a rough cash-flow estimate fast so you can rule out non-starters and spend your detailed underwriting time on the survivors.
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