Guide
The 1% Rule vs Cap Rate: Which Should You Actually Use?
The 1% rule is a screening filter, not an analysis. Here is where it works, where it breaks badly, and how two properties that both pass can be 300 basis points apart.
The 1% Rule vs Cap Rate: Which Should You Actually Use?
The 1% rule says monthly rent should be at least 1% of purchase price. A $200,000 house should rent for $2,000.
It is the most widely used filter in residential real estate investing, and it is genuinely useful — for the narrow job it was built to do. The problem is that it gets used as a verdict rather than a filter, and as a verdict it is close to worthless.
What the rule is actually for
The 1% rule is a speed tool. It exists so you can look at fifty listings and eliminate forty of them in ten minutes without opening a spreadsheet.
That is a real problem worth solving. Most properties on any given day do not work as rentals, and the cost of carefully underwriting each one is high enough that nobody does it. A filter that removes obvious non-starters in five seconds per listing has value even if it is crude.
The rule works because it happens to approximate a debt service coverage test under a particular set of conditions — roughly, rates in the 6–8% range, expense ratios near 50%, and standard 25% down financing. Under those conditions, 1% monthly rent tends to produce a property that at least covers its costs.
Change any of those conditions and the approximation drifts.
Where it breaks
Property taxes
This is the largest failure mode, and it is not close.
The 1% rule contains no information about taxes, and effective property tax rates across the US range from under 0.5% to over 2.2% of assessed value. On a $250,000 property, that is a spread of roughly $4,250 per year — more than $350 a month, straight out of NOI.
Two properties, both renting at exactly 1%:
| Property A | Property B | |
|---|---|---|
| Purchase price | $250,000 | $250,000 |
| Monthly rent | $2,500 | $2,500 |
| Passes 1% rule? | Yes | Yes |
| Effective tax rate | 0.6% | 2.1% |
| Gross annual rent | $30,000 | $30,000 |
| Vacancy @ 6% | –$1,800 | –$1,800 |
| Effective gross income | $28,200 | $28,200 |
| Property taxes | –$1,500 | –$5,250 |
| Insurance | –$1,600 | –$1,600 |
| Management @ 8% | –$2,256 | –$2,256 |
| Maintenance | –$2,400 | –$2,400 |
| NOI | $20,444 | $16,694 |
| Cap rate | 8.2% | 6.7% |
Identical on the 1% test. 150 basis points apart on the metric that actually determines value.
Both might still be fine deals. But if you are choosing between them on the basis that they both “pass,” you are choosing blind.
Insurance
Premiums have moved sharply and unevenly. Coastal Florida, parts of Texas, and wildfire-exposed areas of California have seen increases that a national rule of thumb cannot possibly encode. An insurance line that is $1,600 in one state and $6,000 in another is a 1.7% swing in cap rate on a $250,000 property, and the 1% rule is silent on it.
HOA dues
A condo passing the 1% rule with $400/month in HOA dues has already surrendered nearly a fifth of its gross rent before any other expense. The rule does not see it.
Building age and capex
The 1% rule treats a 2020 build and a 1955 build identically. They are not identical. One has a capital expenditure schedule that is essentially empty for a decade; the other has a roof, a furnace, and probably a sewer line arriving on some unknown timetable. The reserve line that captures this sits entirely outside the rule’s field of view.
Price level
The rule scales linearly. Reality does not.
At $120,000, 1% means $1,200 rent. Fixed costs — insurance minimums, management minimums, the cost of a turnover, a $9,000 roof — consume a much larger share of that gross rent than the same items would at $600,000 with $6,000 rent. Low-priced properties need considerably more than 1% to work; high-priced properties in strong markets can work below it. The rule is most accurate in the middle of the range it was invented in, and least accurate at the extremes where investors most often reach for it.
Does the 1% rule still work in the current market?
In many US metros it now screens out essentially everything. Prices in coastal and high-growth markets have run far ahead of rents, and properties clearing 1% in those areas are scarce enough that a strict filter returns an empty list.
Two responses to that, and only one is sound.
The unsound response is to relax the rule to 0.8%, or 0.7%, and keep using it as a verdict. That preserves the tool’s flaw — no taxes, no insurance, no capex, no market context — while removing the only thing that made it conservative.
The sound response is to recognize what the empty list is telling you. If nothing in a market clears the filter, that market is not currently priced for cash flow. It may still be a good place to own real estate — appreciation and rent growth are real returns — but the deal has to be justified on that basis, explicitly, rather than by moving the goalposts on a cash flow screen.
How to use both properly
They are not competitors. They sit at different stages.
| Stage | Tool | Time per property |
|---|---|---|
| Scanning a listing feed | 1% rule (or 0.8% in tighter markets) | 5 seconds |
| Shortlist worth a real look | Full NOI and cap rate | 15–20 minutes |
| Serious candidate | Cap rate, cash-on-cash, IRR, sensitivities | 45+ minutes |
The 1% rule earns its place at the top of that funnel and nowhere else. Its output is “worth a closer look,” never “buy this.”
A practical adjustment that costs nothing: before applying the rule in an unfamiliar market, look up the effective property tax rate. In a 2%+ tax jurisdiction, raise your screening threshold to 1.1–1.2%. In a sub-0.7% jurisdiction, 0.9% is often enough. That single adjustment fixes the rule’s worst blind spot while keeping it fast.
Other rules of thumb, briefly
The 50% rule — operating expenses will run about half of gross rent. Better grounded than the 1% rule, because it is describing something structural rather than approximating a financing outcome. Still fails on owner-paid utilities, high-tax jurisdictions, and very new or very old buildings.
The 70% rule — for flips, do not pay more than 70% of after-repair value minus repair costs. Different purpose entirely, but the same caveat: it is a filter, not an underwrite.
Gross rent multiplier — price divided by annual gross rent. Same blind spot as the 1% rule, since it also ignores every expense.
Every one of these is a shortcut around building a real NOI. They are worth using at the top of the funnel and worth abandoning the moment a property looks serious.
The friction that makes this matter
If building a proper NOI and cap rate took thirty seconds, nobody would use the 1% rule for anything beyond a first glance. It takes fifteen to twenty minutes per property in a spreadsheet, which is why investors lean on the shortcut far past the point where it is informative.
That is the practical argument for deal analysis software — not that it makes you smarter, but that it collapses the underwrite from twenty minutes to two, which changes where the shortcut stops being necessary. We looked at what is available in best real estate deal analysis software.
FAQ
Is the 1% rule outdated? As a screening filter it still works, provided you adjust the threshold for local tax rates. As a buy signal it was never reliable.
What is a good alternative for high-cost markets? Skip the ratio and screen on cap rate directly against a local benchmark. It takes longer but it is the only approach that survives a market where rents and prices have decoupled.
Can a property fail the 1% rule and still be a good investment? Regularly. Properties in strong-growth, low-tax markets frequently fail it while producing solid total returns through rent growth and appreciation. The point is to know that is the bet you are making.
Does the 1% rule account for the mortgage? No. It contains no financing information at all, which is why two identical-passing properties can have completely different cash flow depending on rate and leverage.