The 1% rule is one of the most quoted shortcuts in rental property investing. It says a property’s monthly rent should be at least 1% of its purchase price — so a $200,000 property should rent for at least $2,000 a month.
It’s popular because it takes seconds to apply. It’s also widely misunderstood as a measure of whether a property will produce cash flow. This guide looks at what the rule actually measures and what it can’t tell you.
The math behind the rule
The 1% rule: ratio ≥ 1%
For the example above: $2,000 ÷ $200,000 = 1.0%. It meets the threshold exactly.
Multiply the monthly ratio by 12 and you get the annual gross yield. A property at exactly 1% has a gross yield of 12%. So the 1% rule is really a gross-yield screen: it filters for properties where rent is high relative to price, before any expenses.
Why the rule exists
The rule is a way to skim a long list of listings quickly. Rent-to-price ratios vary enormously from market to market. In some areas, properties routinely rent for well above 1% of price; in others, ratios below 0.5% are common. A quick ratio separates listings where the rent is substantial relative to the price from those where it’s comparatively small.
As a first pass, that’s useful. The problem comes from treating it as more than that.
What the 1% rule leaves out
Everything between rent and cash flow:
- Vacancy
- Property taxes, which vary widely by location
- Insurance, which varies by location, building age and risk
- HOA or condo fees
- Management, maintenance and CapEx
- Financing — interest rate, loan size and term
Two properties with identical rent and price both “pass,” even if one costs far more to own.
Two properties that both pass
Same price, same rent, very different outcomes
Both properties cost $200,000 and rent for $2,000 per month — a 1.0% ratio. The analysis applies the same 5% vacancy, 8% management and a combined 10% for maintenance and CapEx to both. Each is financed with 20% down at 7% for 30 years ($1,064/month P&I).
| Property A | Property B | |
|---|---|---|
| Property taxes | $2,400 | $6,800 |
| Insurance | $1,100 | $2,600 |
| HOA fees | $0 | $3,000 |
| Annual NOI | $15,076 | $6,176 |
| Cap rate | 7.5% | 3.1% |
| Monthly cash flow | $192 | −$550 |
Hypothetical numbers for illustration.
Property A, with lower taxes, insurance and no HOA, produces positive monthly cash flow. Property B, with higher taxes, higher insurance and an HOA fee, produces negative cash flow at the same rent and price. The 1% rule rates them the same.
A property that “fails”
The rule can also screen out properties that some investors evaluate on other grounds. A $400,000 property renting for $3,000 has a ratio of 0.75% — below the threshold. Whether it produces positive cash flow depends on its expenses and financing, which the ratio doesn’t capture. And some investors weigh other factors, such as expected appreciation or lower turnover, that a rent-to-price ratio doesn’t measure at all.
Where the rule came from — and why it’s debated
The 1% rule became popular when interest rates and prices in many markets made the threshold easier to hit. As prices rise relative to rents, fewer properties meet it, and some investors use 0.8% or 0.7% as their screen instead. Others set aside the rule entirely and go straight to an expense-based calculation.
None of these thresholds is universal. They’re shorthand for “rent is high enough relative to price to be worth a closer look,” and the right cutoff — if any — depends on the market and the investor’s goals.
A better use of the same idea
The rent-to-price ratio is still a useful data point. Some ways to get more from it:
- Use it to rank, not decide. Sort a list of properties by ratio, then run full numbers on the top of the list.
- Compare within a market. A ratio is most meaningful against other properties in the same area and price range.
- Follow it immediately with an expense estimate. A rough 50% rule estimate — assuming about half of rent goes to operating expenses — is one more quick step before a detailed analysis.
- Then run the full calculation. Vacancy, every expense line, the actual loan terms and the resulting cash flow, cap rate and cash-on-cash return.
Related ratios
A few other quick ratios work on the same principle:
- Gross rent multiplier (GRM): price ÷ annual rent. A property at the 1% threshold has a GRM of about 8.3. Lower GRMs mean more rent per dollar of price.
- The 2% rule: a stricter version of the same screen, mostly met in lower-priced markets.
- Price per unit: useful for small multifamily, where rents per unit can be compared across buildings.
Like the 1% rule, each is a quick way to compare price and rent — and like the 1% rule, none of them includes expenses or financing.
The takeaway
The 1% rule compares monthly rent to price — a gross-yield screen that’s fast and easy to apply. It doesn’t account for taxes, insurance, HOA fees, vacancy, maintenance or financing, so two properties that pass can have very different results. It works best as the first filter in a longer process, not as the conclusion of one.