The 1% Rule

The 1% rule is the first filter an investor applies when scanning listings. It takes five seconds: divide monthly rent by purchase price. If the result is 1% or higher, the deal is worth studying. If it is lower, move on. This rule is crude, but it eliminates the vast majority of bad deals and saves you hours of analysis.

Key takeaways

• The 1% rule: monthly rent ÷ purchase price must be ≥ 1.0%.
• Example: A $250,000 property must rent for at least $2,500/month to pass the filter.
• Passes the 1% rule but fails other screens (high expenses, bad location, structural damage) all the time—the rule is a starting point, not a final verdict.
• Markets vary: hot coastal markets rarely pass 1%; secondary markets often exceed 1.5%.
• The rule is easy because it ignores expenses, leverage, appreciation, and taxes. It is a screening tool, not a valuation method.

The math

The formula is simple:

Monthly Rent ÷ Purchase Price = Annual Gross Yield

Example:
$2,500 rent ÷ $250,000 price = 0.01 = 1.0%

If the result is ≥ 1%, the property passes. If it is under 1%, it fails. That is the entire rule. A $300,000 property needs $3,000/month rent. A $150,000 property needs $1,500/month.

The 1% rule, multiplied by 12 months, tells you the property's gross yield (revenue as a percentage of price):

1% × 12 = 12% annual gross yield

A property at 1.0% rent-to-price has a 12% gross yield.
A property at 0.8% rent-to-price has a 9.6% gross yield.
A property at 1.5% rent-to-price has an 18% gross yield.

Why it works as a filter

Most rental properties in hot real estate markets (coastal California, New York, Boston, Denver, Austin) do not pass the 1% rule. A $750,000 property in San Francisco needs $7,500/month rent to hit 1%—but comparable units rent for $4,000–$5,000. Why? Because buyers are betting on appreciation, not immediate cash flow. The property is expensive relative to its rent-generating potential.

In secondary markets and rust-belt cities (Memphis, Detroit, Indianapolis, Oklahoma City), many properties exceed 1%. A $100,000 home might rent for $1,500–$1,800/month, yielding 1.5–1.8%. These markets are cash-flow machines; buyers are betting on recurring income, not appreciation.

For an investor hunting deals, the 1% rule is a sorting mechanism. Markets that consistently exceed 1% are worth exploring. Markets that consistently fall below 1% are worth avoiding unless you are betting on appreciation. The rule is not gospel; it is triage.

What the 1% rule does and does not tell you

What it tells you: The property's gross income relative to purchase price. A property at 1% has a higher rent-to-price ratio than a 0.8% property. That is all.

What it does not tell you:

• Operating expenses (taxes, insurance, maintenance, vacancy). A property at 1.2% might have 50% of rent consumed by expenses, leaving almost no cash flow.
• Financing cost. The 1% rule ignores your mortgage payment. A property at 1% with a 20% down payment and a 30-year mortgage at 6% can still generate positive cash flow after debt service—or negative, depending on expenses.
• Appreciation potential. A 0.9% property in an appreciating market can outperform a 1.2% property in a declining area.
• Local market conditions. A 1% property in a market with strong renter demand is safer than a 1% property in a market with declining population.
• Structural issues, deferred maintenance, or location hazards. A 1% property in a flood zone, or with a failing roof, is not a deal.

Real examples from 2023–2024

Memphis, Tennessee: A three-bedroom, 1,200 sq ft home sold for $150,000 and rented for $1,800/month. Rent-to-price: 1.8%. This property clears the 1% rule easily. Operating expenses (property tax ~$80/month, insurance ~$100/month, maintenance ~$150/month, vacancy ~$150/month) total ~$480/month. Net operating income: $1,800 − $480 = $1,320/month. After a $800/month mortgage (20% down, 6% interest, 30-year), cash flow is $520/month, or 34.7% cash-on-cash return. This is why investors love Memphis.

San Francisco, California: A two-bedroom condo sold for $1,200,000 and rented for $4,500/month. Rent-to-price: 0.375%. This property fails the 1% rule by a wide margin. Operating expenses (property tax ~$200/month, insurance ~$150/month, maintenance ~$300/month, vacancy ~$300/month) total ~$950/month. Net operating income: $4,500 − $950 = $3,550/month. After a $3,800/month mortgage (20% down, 6% interest, 30-year), cash flow is −$250/month. The investor loses $250/month in cash and is betting entirely on appreciation and tax shelter. If the property appreciates 3–4% annually, that is $36,000–$48,000/year in unrealized gains. The investor is buying appreciation, not cash flow.

Austin, Texas: A four-bedroom home sold for $450,000 and rented for $3,000/month. Rent-to-price: 0.67%. This property fails the 1% rule. Operating expenses (~$600/month) leave NOI of $2,400/month. After a $2,150/month mortgage, cash flow is $250/month. The property barely cash-flows and is again dependent on appreciation to justify the purchase.

The 1% rule in different markets

• Hot coastal markets (San Francisco, New York, Boston, Seattle, Los Angeles): Properties often range 0.4–0.7%. Appreciation is the primary return driver. You are buying into a supply-constrained market with strong demand.
• Emerging secondary markets (Austin, Denver, Nashville, Phoenix): Properties range 0.7–1.1%. A mix of appreciation and cash flow; both matter.
• Stable secondary markets (Memphis, Louisville, Indianapolis, Kansas City, Cleveland): Properties range 1.0–1.8%. Cash flow is the primary return driver; appreciation is slower but steadier.
• Weak markets (Detroit, St. Louis, shrinking Rust Belt towns): Properties range 1.5–3.0%+. Very high cash flow but flat or negative appreciation; buyer and renter demand may be declining.

Using the rule in practice

The 1% rule is a first filter, not a final one. Here is how professionals use it:

1. Scan a market or listing site (Zillow, Redfin, local MLS). For each property, calculate rent ÷ price. Drop anything under 0.8%; focus on anything over 1.0%.

2. For properties that pass, pull detailed data: property taxes, insurance quotes, maintenance reserves, vacancy rates in the market, local market trends.

3. Apply the 50% rule (next article) to estimate net operating income more accurately.

4. Run a full cash-flow proforma with your financing, tax situation, and holding period.

5. Only then commit time to inspections, appraisals, and offers.

Many investors find that in their target market, the 1% rule eliminates 70–90% of listings. That is the entire point. It is a time-saving filter.

Why not use cap rate instead?

The cap rate (Capitalization Rate) is NOI ÷ Price. It is more sophisticated than the 1% rule because it accounts for expenses (roughly). A property with 1% rent-to-price and 50% operating-expense ratio has a cap rate of 0.5% (1% × 50%). A property with 1.2% rent-to-price and 40% operating expenses has a 0.72% cap rate.

Cap rates are more accurate, but they require expense data (which you often lack when screening listings). The 1% rule is a rough proxy that requires only rent and price—both available on any listing. Cap rate is the deeper analysis; the 1% rule is the quick screen. Use the rule first, cap rate later.

The rule's blind spots

The 1% rule ignores:

• Rising cap rates in a declining market (rents fall, prices stay high, rent-to-price drops)
• Deferred maintenance that requires immediate capital (a 1% property with a failing roof is a money pit)
• Tenant quality and local vacancy rates (a high-rent-to-price property in a declining market might have low occupancy)
• Local rent-growth trends (a 1% property in a rent-growth market is safer than one in a rent-declining market)

Before committing capital, verify that the property meets other screens (local market strength, tenant demand, no major deferred maintenance).

Mermaid screening flow

Next

The 1% rule answers "Is this property worth investigating?" The 50% rule answers "What is this property actually going to cash-flow?" It is the second filter, and it accounts for the operating-expense burden that the 1% rule ignores.