How Much Cash Flow Per Door Is Good? A Real Guide

How Much Cash Flow Per Door Is Good?

For most single-family and small-multifamily rentals in typical U.S. markets, a good target is $150 to $300 per door per month in true net cash flow — after the mortgage, taxes, insurance, and all the reserves for vacancy, repairs, capex, and management. Below roughly $100 per door, you have almost no margin for error. Above $300, you're either in a strong cash-flow market, buying below market, or taking on more risk somewhere else.

The key phrase there is true net cash flow. Most investors who think they're clearing $250 a door are actually clearing $50 — because they forgot the money that isn't leaving their account every month but absolutely will.

What "Per Door" Actually Means

"Per door" is cash flow divided by the number of rentable units. A duplex is two doors; a fourplex is four. It normalizes deals so you can compare a single-family house to an 8-unit building on the same yardstick.

But a raw per-door number is meaningless until you define what's inside it. A defensible per-door figure subtracts:

• Debt service — principal and interest
• Taxes and insurance — the real forward-looking numbers, not the seller's old bill
• Property management — 8%-10% of rent, even if you self-manage (your time has a cost)
• Vacancy — typically 5%-8% of gross rent
• Repairs and maintenance — often 5%-10%
• Capital expenditures (capex) — 5%-10% for the roof, HVAC, and water heater you will replace

Skip those reserves and your "$250 per door" is a fantasy. This is exactly why the 50% Rule exists as a fast sanity check: operating expenses on a rental commonly run near half of gross rent before debt service.

Why $200 Per Door Isn't a Universal Rule

A flat dollar target ignores what you paid and how much cash you put in. Consider two deals:

• Deal A: $150,000 house, $40,000 all-in cash invested, $200/month = $2,400/year → 6% cash-on-cash
• Deal B: $400,000 house, $110,000 all-in cash invested, $200/month = $2,400/year → 2.2% cash-on-cash

Same per-door number, wildly different quality. That's why experienced investors treat per-door cash flow as a floor and a screen, not the final verdict. Pair it with cash-on-cash return to judge whether the capital is working hard enough.

A practical framing:

• Per-door answers: Does this property carry itself with a safety cushion?
• Cash-on-cash answers: Is my money better here than somewhere else?

You want both to pass.

Sensible Per-Door Targets by Property Type

These are rules of thumb, not laws — adjust for your market:

• Single-family rentals: $150-$300/door. Lower vacancy and turnover, but one empty unit means 100% vacancy.
• Small multifamily (2-4 units): $150-$250/door. More doors spread your vacancy risk, so a slightly lower per-door figure can still be safe.
• Larger multifamily (5+ units): $100-$200/door can work because scale absorbs the shocks and one vacancy is a small fraction of income.
• Higher-cost / appreciation markets: you may accept $75-$150/door if the total return through appreciation and loan paydown is strong. Just go in with eyes open.

A Worked Example

Take a $220,000 single-family rental renting for $1,850/month:

• Gross rent: $1,850
• Vacancy (6%): -$111
• Effective income: $1,739
• Taxes: -$210
• Insurance: -$95
• Management (9%): -$167
• Repairs (6%): -$111
• Capex (6%): -$111
• NOI-ish operating cash: ~$1,045
• Debt service (25% down, ~30-yr at market rate, ~$165k loan): -$1,050
• Net cash flow: roughly -$5/door

This deal, at list price, is a break-even trap dressed up as a rental. To hit $200/door you'd need to negotiate price down, buy the rate down, raise rent, or find a lower-tax jurisdiction. That's the value of running the full stack — the headline rent looked great.

Common Mistakes That Kill Per-Door Math

• Using the seller's tax bill. Taxes often reset on sale. Model the reassessed number, not the current one.
• Ignoring capex. Roofs and furnaces don't care that this month was quiet. Reserve monthly.
• Assuming zero vacancy. Even great markets turn over. Build in a realistic vacancy rate for your submarket.
• Counting self-management as free. If you'd have to pay someone to replace you, it's an expense.
• Chasing per-door in a declining market. High cash flow in a market losing population is often a warning, not a win.

Pros and Cons of Targeting High Per-Door Cash Flow

Benefits:

• A fat cushion survives vacancy, repairs, and rate resets.
• Strong monthly cash flow lets you scale without needing a day job.
• Lenders and partners love resilient, self-carrying deals.

Trade-offs and risks:

• The highest per-door numbers cluster in lower-appreciation, higher-turnover markets — you may trade long-term equity growth for monthly income.
• Chasing cash flow can pull you into rough neighborhoods with hidden management and collection headaches.
• A big per-door figure on a tiny purchase price can still be a mediocre return on capital.

Stop Guessing the Inputs

The honest truth: your per-door target is only as good as the numbers feeding it. Guess the taxes, hand-wave the vacancy, and forget capex, and you'll "buy" cash flow that never shows up. This is where analyzing a deal against real, verified market data matters more than any rule of thumb — PropertyWiz AI pre-populates rent, taxes, insurance, vacancy, and reserves from live market data and stress-tests the per-door number in seconds, so you're deciding on facts instead of optimistic typing.

Set your floor at $150-$300 per door, define exactly what's inside it, and never let a headline rent talk you out of the reserves.