The 1% Rule Is Dead: How to Actually Underwrite a Rental in 2026
For a decade, investors screened deals with one shortcut: if monthly rent equals 1% of purchase price, buy it. That math broke when rates went up. Here's the underwriting framework that replaced it — and why Memphis is one of the few metros where the new math still works.
Why the shortcut stopped working
The 1% rule was born in a world of 4% mortgages. At today's investment-property rates — which have hovered near 8% before recently softening — a property that rents for exactly 1% of its price often produces negative monthly cash flow after debt service, taxes, insurance, and reserves. Industry analysts now point to rent-to-price ratios closer to 1.5–2% for a deal to genuinely cash flow in most markets, and national data shows investor loans consistently pricing more than a point above owner-occupied mortgages.
That doesn't mean rentals stopped making money. It means lazy screening stopped working. The investors still winning in 2026 underwrite with three numbers instead of one.
Number 1: DSCR of 1.2 or better
Debt Service Coverage Ratio is simple: net operating income divided by annual debt payments. A DSCR of 1.0 means the property exactly covers its mortgage — with zero margin for a vacancy or a water heater. Lenders and experienced investors now treat 1.2 as the floor; below that, properties struggle to refinance and every surprise comes out of your pocket. When we run rent analyses for Memphis-area owners, DSCR is the first number we look at.
Number 2: Cash-on-cash of 8–10%
With 10-year Treasuries yielding around 4.5% and investment-grade bonds paying 6–7%, a rental property has to earn its risk. The emerging consensus: target 8–10% minimum cash-on-cash return — annual pre-tax cash flow divided by your total cash invested. If a deal pencils at 5%, you're taking landlord risk for bond returns. This is exactly why capital keeps flowing to affordable, job-rich metros like Memphis, where purchase prices in the $150K–$250K range against $1,300–$1,900 rents can still clear that hurdle.
Number 3: After-tax cash flow, stress-tested
Sophisticated investors have shifted focus from pre-tax projections to after-tax cash flow — factoring in depreciation and the Section 199A pass-through deduction, which can meaningfully change a deal's real return. Then they stress-test: what happens at 10% vacancy? With a $4,000 HVAC replacement in year one? If rent growth is zero for two years? A deal that survives the stress test is a deal; a deal that only works in the sunny scenario is a hope.
"Screen with rent-to-price. Underwrite with DSCR. Decide with stress-tested, after-tax cash-on-cash."
The Memphis advantage, quantified
Run this framework across the country and you'll find most coastal and Sun Belt boom markets fail at step one. The Mid-South keeps passing because the fundamentals line up: below-average purchase prices, a deep renter base anchored by logistics and healthcare employment, and steady (not speculative) rent growth. It's not a flashy market — it's an arithmetic market. That's the kind that pays every month.
Want us to run these exact numbers on a property you're considering? We'll underwrite it with real Memphis rents — not pro forma guesses — before you offer. Get in touch or start with a free rent analysis.
Sources & further reading: BiggerPockets: The 2026 State of Real Estate Investing, 2026 Cash Flow Analysis for Rental Properties, 2026 Long-Term Rental Buying Guide.