Investors keep asking whether the 1% rule still means anything. Short answer: in most US metros, no. The math behind it assumed a price-to-rent relationship that stopped holding around 2021, and mortgage rates in the 6.5% to 7.5% range since then made the gap worse, not better.
That doesn't mean the rule is useless. It means you need to know when it applies, when it doesn't, and what to run instead.
What the 1% Rule Actually Says
The rule is simple: monthly rent should equal at least 1% of the purchase price. Buy a house for $200,000, and you want $2,000 a month in rent. It was never meant to replace a full cash flow analysis. It was a five-second filter to decide whether a property was worth a second look.
The rule came out of an era when home prices in a lot of working-class and mid-tier metros sat in the $100,000 to $180,000 range, and rents for those same homes ran $1,200 to $1,800. The ratio worked because both numbers grew at similar rates for years.
Why the Ratio Broke
Between 2020 and 2022, home prices in most metro areas jumped 30% to 45%. Rents rose too, but nowhere close to that pace. Apartment List and Zillow rent data both show national rent growth in the 3% to 6% annual range over the same stretch that home prices moved in double digits some years.
The result: price-to-rent ratios stretched. A property that traded for $180,000 with $1,800 rent in 2019 might trade for $310,000 today with rent closer to $2,100. Run the math: $2,100 divided by $310,000 is 0.68%, not 1%.
Rates made it worse. A $310,000 purchase with 20% down, financed at 7% over 30 years, runs about $1,650 a month in principal and interest alone before taxes and insurance. Add $300 to $400 a month for property tax and insurance in a lot of states, and the mortgage payment alone can eat most or all of the rent.
A Hypothetical That Shows the Gap
Say an investor is looking at a single-family rental listed at $340,000 in a mid-size Southern metro. Comparable homes rent for around $2,300 a month based on local listing data.
- 1% rule target: $3,400/month
- Actual achievable rent: $2,300/month
- Ratio: 0.68%
Run the numbers further. At 20% down ($68,000) and a 7% rate on the remaining $272,000, principal and interest lands near $1,810/month. Property tax at 1.2% of value adds about $340/month. Insurance runs another $150 to $250/month depending on the state. Before a single dollar goes to maintenance, vacancy, or property management, the carrying cost is close to $2,300 to $2,400/month, which matches or exceeds the rent.
That property fails the 1% rule badly, and it also fails a basic cash flow test. Two different tools, same conclusion. That alignment is worth noting: when the 1% rule and the real numbers agree this closely, it's not a fluke, it's a market where price growth outran rent growth for years.
Where the Rule Still Holds
The 1% rule survives in lower-price-point markets, mostly in parts of the Midwest and pockets of the Rust Belt, where entry prices sit under $150,000 and rents haven't compressed as much relative to price.
Say a duplex in a smaller Midwest city lists at $135,000, with each unit renting for $750. Combined rent is $1,500 a month, which is 1.11% of the purchase price. That property clears the rule and, on paper, has a shot at positive cash flow even with today's rates, because the loan amount is small enough that principal and interest stays manageable.
The pattern holds broadly: the lower the purchase price relative to national rent averages, the more likely a property clears 1%. High-appreciation coastal and Sunbelt metros almost never clear it anymore. That's not a coincidence, it's the direct result of price appreciation outrunning rent growth in exactly those markets.
Better Metrics for Underwriting in 2026
The 1% rule was always a filter, not an underwriting model. Here's what actually predicts whether a property cash flows.
Cap Rate
Net operating income divided by purchase price. Take gross rent, subtract vacancy (typically 5% to 8% of gross rent as a planning number), property management (8% to 10% if you're not self-managing), taxes, insurance, and a maintenance reserve (often modeled at 5% to 10% of rent). Divide the result by the purchase price. A cap rate under 5% in a market with 7% financing rates usually means negative leverage, where the loan costs more than the property earns.
Cash-on-Cash Return
This measures actual cash in your pocket against actual cash invested. Take annual pre-tax cash flow (after mortgage payments) and divide by your down payment plus closing costs. Most investors target 8% to 12% cash-on-cash, though that threshold shifts with your cost of capital and risk tolerance.
DSCR (Debt Service Coverage Ratio)
This is the number your lender actually cares about, especially on DSCR loan products aimed at investors. It's net operating income divided by the annual mortgage payment. A ratio of 1.0 means the property just covers its own debt. Most DSCR lenders want 1.15 to 1.25 minimum, and pricing gets better above 1.25.
The 50% Rule as a Cross-Check
A rougher but still useful filter: assume operating expenses (excluding mortgage) eat about 50% of gross rent over time, once you average in vacancy, repairs, capex, taxes, and insurance. On $2,300 in rent, that's about $1,150 a month left to cover the mortgage and produce profit. If your mortgage payment already exceeds that, the deal likely doesn't work regardless of what the 1% rule says.
Running the Numbers Before You Make an Offer
A workable process takes twenty minutes with public data:
1. Pull the actual property tax bill from the county assessor, not an estimate.
2. Get a real insurance quote for the property's address and construction type, since rates vary widely by state and roof age.
3. Pull three to five comparable active rental listings within a mile, not the listing agent's rent estimate.
4. Model vacancy at 5% to 8% of annual rent, not zero.
5. Add a capex reserve of at least $100 to $200/month for anything built before 2000.
6. Calculate cap rate, cash-on-cash, and DSCR, then compare against your own minimum thresholds before writing an offer.
The Cash Buyer Angle
Cash purchases change two variables that matter a lot in this math: the size of the down payment (100% versus 20%) and the elimination of financing costs. A cash buyer skips the $1,800/month mortgage payment entirely, which turns a property that fails every rental metric above into one that produces real monthly income, just on a much larger amount of capital deployed up front.
That's a different investment calculation, closer to a straight cap rate or cash-on-cash comparison against other uses of that same capital, like index funds or other properties bought with leverage elsewhere. Cash buyers also close faster, often in 7 to 14 days versus 30 to 45 for financed purchases, which matters to sellers dealing with a relocation deadline, a divorce settlement, an inherited property sitting vacant, or a pre-foreclosure timeline where speed determines the outcome as much as price does.
Where This Leaves the 1% Rule
Use it as a five-second screen, not a decision. If a property clears 1%, it's worth running full numbers. If it doesn't, that's not automatically a pass, especially in higher-cost metros where nothing clears 1% anymore, but it does mean you skip straight to cap rate and DSCR instead of wasting time on a rule built for a different rate environment.
The rule isn't dead. It's just regional now, tied to price points under roughly $150,000 to $175,000 in most of the country. Above that, run the real math or you'll misprice the deal in either direction.
Get competing cash offers on your home, no fees, close in days, at homedinero.com