Real Estate Tax Calc
What the 1% rule says
The 1% rule is a shortcut: monthly rent should be at least 1% of the purchase price. It's a quick screen to decide whether a deal is worth a closer look.
Why it's only a screen
The 1% rule ignores expenses, financing, and local taxes. Two properties passing the rule can have very different real returns once those are counted.
Cash-on-cash is the real test
After a deal passes the 1% screen, calculate cash-on-cash return with actual expenses and your mortgage to see what you'd truly earn.
A worked example: same 1% pass, different reality
Two properties both 'pass' the 1% rule. Property A costs $200,000 and rents for $2,000/month (exactly 1%). Property B also costs $200,000 and rents for $2,000, but it sits in a state with property taxes three times higher, an older building with more deferred maintenance, and an HOA. On paper the 1% rule rates them identically. Run the real numbers and they split apart. Property A nets, say, $9,000 of annual cash flow after all expenses and its mortgage — on $50,000 invested, an 18% cash-on-cash... but wait, that is unrealistically high, so more typically Property A yields around 7–9%. Property B, burdened by taxes, the HOA, and higher upkeep, might net only $1,500 — a 3% cash-on-cash. Same rent-to-price ratio, less than half the real return. The 1% rule could not see the difference; cash-on-cash could.
Why the 1% rule persists anyway
Despite its crudeness, the 1% rule endures because it is genuinely useful as a first filter. When you are scanning dozens of listings, you need a way to reject the obviously overpriced ones in seconds without building a spreadsheet for each. The 1% rule (and its cousins, the 2% rule for cash-flow markets and the 0.7% rule some accept in expensive metros) does exactly that. It also encodes a rough truth: rent must bear some reasonable relationship to price for a deal to cash flow at all. The mistake is not using the rule — it is stopping at the rule. It tells you a deal is worth a closer look; it never tells you the deal is good.
What the 1% rule ignores
The rule collapses an entire investment into two numbers — rent and price — and throws away everything else. It ignores property taxes, which vary enormously by state and county and can swing cash flow by hundreds of dollars a month. It ignores insurance, HOA dues, property management, vacancy, and capital-expenditure reserves. It ignores financing entirely — your interest rate, term, and down payment are invisible to it, even though they determine your actual cash flow. And it ignores condition: a property needing a new roof and HVAC can pass the 1% rule while bleeding cash. Two deals with identical rent-to-price ratios can have opposite outcomes once these factors are counted, which is precisely why the rule is a screen and not a verdict.
How the two tools work together
Think of the 1% rule and cash-on-cash return as a funnel. At the wide end, the 1% rule quickly narrows a large pool of listings to a shortlist worth analyzing. At the narrow end, cash-on-cash — computed with real rents, real expenses, a real vacancy assumption, real reserves, and your actual loan terms — tells you what each shortlisted deal would truly earn. A disciplined investor runs the 1% rule in their head while browsing, then builds a proper cash-on-cash (and, for serious contenders, a multi-year IRR) before making an offer. Skipping the first step wastes time analyzing junk; skipping the second step buys deals on a slogan.
Beware markets where the 1% rule breaks down
In expensive, high-appreciation metros — coastal California, Seattle, parts of the Northeast — almost nothing meets the 1% rule, yet investors still buy there and profit. Their thesis is appreciation and loan paydown, not current cash flow, so a metric built entirely around rent-to-price is the wrong tool. Conversely, in low-cost Midwestern and Southern markets, properties can clear the 2% rule but carry hidden risks — weaker rent growth, higher tenant turnover, and thinner appreciation — that a simple ratio cannot reveal. The lesson is that rules of thumb are calibrated to a particular kind of market. When you cross into a different market, the threshold that signals a good deal changes, and only a full cash-on-cash or total-return analysis travels reliably.
Better screens than the 1% rule
If you want a fast filter that captures more reality than the 1% rule, several exist. The 50% rule assumes operating expenses (excluding the mortgage) will run about half of gross rent — a quick way to sanity-check cash flow. The gross rent multiplier (price ÷ annual gross rent) lets you compare properties on a price-to-income basis. A quick cap rate estimate using rough NOI gets you closer to the property's true unleveraged yield. None replaces a full cash-on-cash analysis, but each captures more than rent-to-price alone. Layering two or three quick screens before you build a full model catches more bad deals early while still leaving the real decision to the metric that counts your actual dollars: cash-on-cash return.
The 2% rule and other variants
The 1% rule has siblings calibrated to different markets. The 2% rule — monthly rent of at least 2% of price — is a much stricter screen used in low-cost, cash-flow-focused markets; properties that clear it are rare and often carry higher operational risk. The 0.7–0.8% versions are what investors in expensive coastal metros quietly accept, knowing nothing there meets 1%. Some use the 50% rule (operating expenses ≈ half of gross rent) as a companion cash-flow check, or the gross rent multiplier (price ÷ annual gross rent) to compare properties on a price-to-income basis. All of these are rules of thumb — fast, memorable, and calibrated to a particular market. The danger is treating a threshold tuned for one market as a universal law. Pick the variant that matches where you invest, and still verify with real cash-on-cash math.
A step-by-step: from 1% screen to offer
Here is how the two tools fit into an actual buying process. Step 1: while browsing listings, apply the 1% (or your market's variant) in your head to kill obvious non-starters in seconds. Step 2: for survivors, pull real numbers — current lease rents, the actual tax bill, insurance quotes, HOA dues, and a realistic vacancy and reserve assumption. Step 3: get a real financing quote (rate, term, down payment) rather than guessing. Step 4: compute cash-on-cash return with those inputs, and for serious contenders build a multi-year pro forma with IRR. Step 5: compare the finalists on the same basis and make an offer priced to hit your target return, not the seller's asking price. The 1% rule saved you time in step 1; cash-on-cash made the decision in step 4.
Using the 1% rule on your existing portfolio
The rule is not only for buying — it is a quick lens on properties you already own. Run it against a property's current value rather than what you paid: if a rental you bought years ago is now worth far more, its rent may have fallen well below 1% of today's value. That gap is a signal to analyze whether your return on equity has quietly eroded — you may be earning a thin return on a large, trapped pile of appreciated equity. That analysis can point toward a cash-out refinance to redeploy equity, a 1031 exchange into a higher-yielding property, or simply a rent increase to market. As always, the 1% check only flags the property for a closer look; the real decision comes from computing your actual cash-on-cash and return-on-equity on today's numbers.
Adjust the rule for the rate environment
The 1% rule was popularized in an era of much lower interest rates, and that context matters. When mortgage rates were 4%, a property renting at 1% of price could comfortably cash-flow after debt service; at 7%+, the same 1% property may barely break even or lose money each month, because the higher mortgage payment eats more of the rent. In other words, the rule's implicit promise — that a 1% property will cash-flow — quietly breaks when financing gets expensive. Some investors now informally raise their screen (looking for 1.1–1.25% in high-rate markets) to preserve a cushion, while others simply skip straight to a full cash-on-cash calculation because the rule no longer maps cleanly to cash flow. The takeaway: a rule of thumb calibrated in one rate environment can mislead in another, so re-test its assumptions whenever borrowing costs shift materially.
Frequently asked questions
Is the 1% rule reliable?
It's a quick screen, not a decision tool — it ignores expenses, taxes, and financing. Use cash-on-cash return to actually evaluate a deal.
What replaces the 1% rule?
A full cash-on-cash (or IRR) analysis with real numbers — actual rents, expenses, vacancy, reserves, and your loan terms.
Can a property pass the 1% rule and still be a bad deal?
Yes. Two properties with the same rent-to-price ratio can have very different real returns once property taxes, insurance, HOA dues, condition, and financing are counted. The 1% rule cannot see any of those.
Does the 1% rule work in expensive markets?
Usually not. In high-cost, high-appreciation metros almost nothing meets the 1% rule, yet investors still profit through appreciation and loan paydown. There, a rent-to-price screen is the wrong tool — use total-return analysis instead.
What is the 50% rule and how does it relate?
The 50% rule assumes operating expenses (excluding the mortgage) will consume about half of gross rent. It is a faster cash-flow sanity check than the 1% rule but still a rough screen, not a substitute for a real cash-on-cash calculation.
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.