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% to 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% to 40%. Older Class C/D properties in high-tax states with high turnover can run 55% to 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% to 50% is typical. For NNN commercial leases, expenses are passed through to the tenant, so the ratio is much lower (10% to 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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