How Much Cash Flow Is Actually "Good"? Setting Realistic Return Targets

New investors often go looking for a single magic number — a rent-to-price ratio, a flat cash flow target, a rule that tells you in five seconds whether a deal is worth pursuing. The appeal is obvious: it's fast, and it feels objective. The problem is that in most markets today, those flat rules set expectations that today's prices and rents simply can't clear, which either scares people out of real estate entirely or pushes them toward chasing deals in markets they don't actually want to own in.

There isn't a universal number that defines a "good" rental. What counts as a strong return depends on your market, your financing, and what you're optimizing for. What follows is a more useful way to set a target than a single ratio.

Start with what you're actually optimizing for

Most buy-and-hold investors are really balancing three different things, and a single deal is rarely the best on all three at once:

• Cash flow — money in your pocket every month, after every expense and the mortgage payment.
• Appreciation — growth in the property's value over time, realized when you sell or refinance.
• Equity paydown — the portion of every mortgage payment that reduces principal, which is a return even in a month with zero cash flow.

A property with thin cash flow in a high-appreciation market can still be a strong long-term hold. A property with strong cash flow in a slow-growth market can still be a strong income asset. Neither is automatically "better" — they're different strategies, and the right target depends on which one you're building toward.

Use ranges, not thresholds

Instead of a pass/fail cutoff, it's more useful to think in ranges for the metrics that actually account for your financing:

These aren't pass/fail lines — they're a sense of where reasonable deals tend to land. A stable, low-crime, high-appreciation suburb will often sit at the low end of these ranges, and that can still be the right buy if appreciation and equity paydown are doing real work. A higher-cash-flow market will often sit at the high end, with less appreciation upside. Both are legitimate strategies; the mistake is expecting the high end of every range from the same property.

Compare against your actual alternative, not a rule of thumb

A better question than "does this hit some target number" is "what am I comparing this to?" If your alternative is a savings account or index fund, a 5% cash-on-cash return plus appreciation and principal paydown is a real comparison worth making honestly, on the actual numbers — not against a rent-to-price ratio that has nothing to do with either option.

The takeaway

Skip the single magic number. Decide what you're optimizing for — cash flow, appreciation, or a blend — set a range for cash-on-cash return and cap rate that fits your market, and stress-test the deal against a bad month rather than screening it against a ratio that was never designed for today's prices.