The 50% Rule for Rentals: Test It With Real Opex Data

By RentalAnalytics Editorial Team · Published October 19, 2026

Key takeaways

• The rule estimates operating costs at 50% of gross rent. Debt service stays outside that half.
• The operating expense benchmark scores taxes, insurance, maintenance, and management against illustrative national bands in opex-benchmarks.json, dated 2024-Q4. The file says the bands are not a local measurement.
• The total band is 35% to 50% of effective gross income, mid 42%. The four typed lines at their mid points add to 33%. The wider total covers utilities, admin, and reserves the form does not itemize.
• The rule breaks on structural taxes and insurance, on a lean self-managed house, and when 50% of scheduled rent is applied to income already net of vacancy.
• Pass survivors to the cash flow analyzer, which builds NOI from dollars, then subtracts the loan.

What does the 50% rule actually estimate?

It estimates expenses, then NOI, from rent alone. On $30,000 of gross rent the rule sets costs at $15,000 and NOI at $15,000. Stessa puts insurance, taxes, maintenance, utilities, management, and reserves inside that half, and leaves the mortgage out. Stessa, "What is the 50% Rule in real estate investing?"

An operating expense ratio does the same division with your own line items. The rule skips the lines and inserts 50%.

What does the opex benchmark show, line by line?

Your dollars become a percent of effective gross income, then a below, in-band, or above mark. The table loads from /assets/data/opex-benchmarks.json. The page calls the bands an illustrative national mid-band commonly cited in IREM and NAR landlord surveys. Percents are arithmetic from what you type. The page says Florida insurance or Texas taxes often sit above that mid-band, and that the file does not measure the pattern.

The bands, as a percent of EGI, are:

The four highs add to 46%, not 50%. The page says the total band usually includes utilities, admin, and reserves beyond those four lines, so a below-band total can still be complete for a lean single-family rental. Maintenance here is recurring repairs. Capital replacements are a separate reserve, covered in CapEx reserves per unit.

Where does 50% sit against those bands?

At the ceiling, and above the mid point. The file's high is 50% of EGI and the mid is 42%. Applying 50% to scheduled rent is a deeper cut than 50% of EGI once vacancy is already out.

Round example, not a market. Scheduled rent is $24,000. Vacancy is 5%, so EGI is $22,800. The rule sets operating costs at $12,000 and NOI at $12,000. That $12,000 is 52.6% of EGI.

The same EGI at the file's mid points:

• Taxes at 12% are $2,736.
• Insurance at 5% is $1,140.
• Maintenance at 8% is $1,824.
• Management at 8% is $1,824.
• Those four lines total $7,524, or 33% of EGI.
• The total-band mid, 42% of EGI, is $9,576. The total-band high, 50% of EGI, is $11,400.

The rule's $12,000 is $2,424 above the 42% mid and $600 above the 50% high. NOI at the 42% mid is $22,800 minus $9,576, or $13,224, against $12,000 under the rule.

The four lines at their highs are 46% of EGI, or $10,488, still under $12,000 before utilities and admin. The rule and the band meet only when both use EGI and you take the 50% high.

Where does the rule break?

It breaks where one or two bills crowd out the rest, and where the basis does not match.

Taxes and insurance go first. The file's tax high is 16% of EGI and the insurance high is 8%, or 24% before repairs or a manager. Insurance and property taxes as opex shows why those bills move NOI in Florida and Texas: a purchase can reset a Florida assessment, and a Texas rental does not get the homestead appraisal cap. Taxes above 16% of EGI are already over the line's high. Everything else has to fit in what is left of 50%.

A lean self-managed house is far from 50%. File lows with management left out, because you do the work: taxes 8%, insurance 3%, maintenance 5%. That is 16% of the example EGI, or $3,648. The rule still subtracts $12,000. The tool's note says a below-band total on the four lines can be a complete set for a lean house. Use the rule to drop a deal that fails even at half of rent.

Vacancy and the roof get counted twice. The benchmark divides by EGI, already net of vacancy. Stessa's version of the rule starts from gross income and puts reserves inside the half. Take 50% of scheduled rent and then subtract vacancy again, and the empty month is gone twice. Deduct another CapEx reserve below NOI, and the roof is reserved twice. Pick one slot for each.

Stessa's Alaska triplex is the same lesson from a purchase: a new roof and below-market rents did not behave like a 50% property, and owner-paid heat opened a hole the rule never itemized. The actual bills fixed the screen. Stessa

How do you test a listing with the rule and then with the tools?

Run the rule in one pass, then replace it with dollars.

1. Annualize rent and cut it in half. That half is the operating budget. NOI is the rest. Subtract the mortgage only for a cash sketch.
2. On the benchmark, enter rent and vacancy, or paste EGI. Add taxes, insurance, maintenance, and a management percent.
3. A line over its high is a seller question. A four-line total under 35% of EGI can fit a house where the tenant pays utilities and you self-manage, or it can mean the tax bill still uses a homestead cap.
4. Move those dollars into the cash flow analyzer. NOI comes before debt. Management is a percent of EGI. Maintenance there is upkeep, not a roof.

A deal that fails the sketch can still deserve the second pass once the tax bill is real. A deal that works only at every band low is the one to drop.

A nightly stay and a furnished monthly stay still share those tax and insurance dollars. Medium-Term Rentals vs STR vs LTR: Which Pays More? runs that comparison on one set of bills.

FAQ

Does the 50% rule include the mortgage?

No. The half is operating cost. Subtract the mortgage after NOI. The cash flow analyzer uses that order.

Is the 50% rule the same as a 50% operating expense ratio?

Only on the same rent. The rule usually uses scheduled rent. This benchmark uses EGI after vacancy, so half of scheduled rent is a larger share of EGI.

What total does the opex benchmark call in-band?

35% to 50% of EGI, mid 42%, labeled a national illustration, not a metro measurement. The four typed lines have their own bands, and their mid points sum to 33%.

Should CapEx sit inside the 50%?

Stessa puts reserves in the half. Standard NOI leaves replacements out. Do not reserve the roof in both places.

Why can Florida or Texas miss a national 50% test?

Taxes and insurance can clear a national mid-band while repairs stay ordinary. The benchmark page expects that and says the file does not measure it. Use the local bill.

What should I run after the 50% screen?

The benchmark for line verdicts, then the cash flow analyzer for NOI, debt, and cash flow. The 50% figure produces none of those.

Sources

1. RentalAnalytics, Operating Expense Benchmark, and the illustrative bands in /assets/data/opex-benchmarks.json (as-of 2024-Q4) - https://rentalanalytics.com/tools/opex-benchmark
2. RentalAnalytics, Cash Flow Analyzer - https://rentalanalytics.com/tools/cash-flow-analyzer
3. Stessa, "What is the 50% Rule in real estate investing? Is it foolproof?" - https://www.stessa.com/blog/50-percent-rule