What Is the 1% Rule in Real Estate Investing?

The 1% rule says a rental property should bring in monthly rent equal to at least 1 percent of its purchase price. A $200,000 house should rent for at least $2,000 a month to pass.

It is a screening filter, not an analysis. The rule exists so an investor can look at fifty listings in ten minutes and decide which six deserve a real underwriting. It says nothing about whether a property will actually make money, and it is entirely possible to buy a property that passes the 1 percent rule and loses money every single month.

How do you apply the 1% rule?

Divide expected monthly rent by purchase price. If the result is 0.01 or higher, it passes.

The better version uses all-in cost, meaning purchase price plus rehab plus closing costs, rather than just the purchase price. A $150,000 house that needs $35,000 of work is a $185,000 investment, and the rent has to carry all of it. Measuring against the purchase price alone quietly inflates every distressed deal you look at.

Here is the arithmetic across a range of prices, along with two common alternative thresholds.

Look at the $450,000 row. In most metros, a $450,000 single-family home does not rent for $4,500 a month, which is why investors in expensive markets often abandon the rule outright or drop the threshold to 0.7 or 0.8 percent and rely on appreciation for the rest of the return.

Where does the 1% rule come from?

It is a compressed version of a real relationship. Rent has to cover operating expenses and debt service, and in a specific historical combination of interest rates, property taxes, and insurance costs, 1 percent happened to be roughly the level where a leveraged rental broke even with a little room to spare.

That is the problem. The rule bakes in a rate environment and a cost structure that are not constant. It has no term for your interest rate, your property tax rate, your insurance premium, your HOA dues, or the age of the roof. Change any of those materially and the 1 percent threshold stops meaning what it used to mean.

A worked example: two properties, same 1% score (illustrative only)

These numbers are invented to make the point. They are not drawn from any specific market.

Two rentals, both priced at $180,000, both renting for $1,800 a month. Both score exactly 1.00 percent. Both are financed with 25 percent down, a $135,000 loan at 6.75 percent over 30 years, for a payment of $876 per month.

The only difference is the fixed carrying costs.

Identical scores on the rule. A difference of $6,660 per year in the outcome. Property B is a perfectly ordinary situation in a coastal or high-premium insurance market, where windstorm coverage and a higher effective tax rate together consume more than half of collected rent before the mortgage is even paid.

The 1 percent rule cannot see any of that, because it has no expense inputs at all. Run both through the rental property calculator and the difference shows up in about ninety seconds.

When does the 1% rule mislead you most?

• •High property tax jurisdictions. An effective rate above 2 percent changes the math substantially, and some places layer special assessments on top of that.
• •High insurance markets. Coastal wind, wildfire exposure, and older roofs can multiply the premium several times over.
• •Condos and HOA properties. Monthly dues can be $400 or more, and the rule has no place to put them.
• •Older housing stock. A property with a 22-year-old roof and original HVAC needs a much larger capital reserve than a five-year-old build.
• •Rate environments. The same property at a 4 percent loan and a 7.5 percent loan produces completely different cash flow, and the rule is blind to the difference.
• •Very high ratios. A property clearing 2 percent is worth investigating carefully. Sometimes it is a genuine mispricing. More often the market has already priced in collection risk, turnover, or a neighborhood trend the numbers alone do not show.

What should you use instead?

Use the 1 percent rule for what it is good at, which is triage, then replace it with real math on anything that survives.

1. Screen with the ratio. It costs seconds and it eliminates most listings honestly. 2. Verify the rent. This is the input the rule depends on entirely, and a $200 miss changes the answer. Check actual comparable rentals rather than accepting a listing site's guess. 3. Build the expense list. Taxes, insurance, management, vacancy, maintenance, capital reserves, HOA, and utilities you pay. The property tax estimator helps with the line item that most often gets copied incorrectly from the seller's current bill. 4. Calculate cash flow and return. Net operating income minus debt service, then divide the annual cash flow by the cash you actually invested. The cash-on-cash calculator does that in one step. 5. Stress it. Add two months of vacancy, raise the insurance 30 percent, and see whether the deal survives.

The full version of that sequence lives in the deal analyzer, and the rest of the free tools are at free tools if you want to check individual pieces.

The honest summary

The 1 percent rule is a useful reflex and a terrible conclusion. Investors who use it to decide what to look at closely tend to do well with it. Investors who use it to decide what to buy eventually own a Property B and find out that a rule with no expense inputs cannot tell them anything about expenses.

Keep the reflex. Do the arithmetic before you write the offer.