How to spot a bad rental deal in 60 seconds — 7 red flags
May 24, 2026 · 8 min read
Seven red flags that tell you a rental doesn't pencil — before you waste hours running the full underwrite. The triage every experienced investor does in their head in the time it takes to load the listing.
Every serious rental investor builds a mental triage filter. They glance at a listing, look at five numbers, and either move on or open the analyzer. The point isn't to run a perfect underwrite in 60 seconds — it's to know whether the deal is worth the next 30 minutes.
Here are the seven red flags I run through, in the order I check them.
1. Gross rent is below 0.7% of price (the "reverse 1% rule")
The classic 1% rule says monthly rent should be at least 1% of purchase price. That's gotten harder to hit since 2020 — many growing markets are 0.5-0.7% now. But under 0.7% in a typical conventional-financing market is a red flag worth pausing on.
The math: a $300k house renting for $1,800/mo (0.6%) is going to have negative cash flow at almost any conventional financing in a normal rate environment. If you're still interested, you're betting on appreciation, not yield. That's a valid bet — but it's a different bet, and you should know you're making it.
2. Property taxes are above 2% of value
Property tax is a fixed, recurring drag on cash flow that you can't negotiate. In Texas (1.6-2.5%+ effective), Illinois (2.3%+), or new-construction Sun Belt MUDs (2.8-3.2%+), a deal that looks great on rent-to-price can lose half its cash flow to the tax bill.
Always pull the actual current tax bill from the County Appraisal District for the specific parcel. The seller's last bill may not reflect post-reassessment reality (especially in Jackson County MO, parts of Florida, and Texas MUDs).
3. The listing photos are aggressively staged but exclude a room
This sounds like a soft signal. It's actually one of the strongest hard ones. When you see 30 photos and they've photographed the same living room from 4 angles but there's no kitchen shot or no bathroom shot, the seller knows that room costs money to fix and they're not showing you. Budget rehab accordingly.
Related signal: the photos look professionally staged but the comps in the neighborhood are wholesaler-flagged. You're looking at a polished wholesaler listing. Reduce your offer.
4. The HOA is "TBD" or above $400/mo
HOA fees go up. Special assessments happen. An HOA that's currently $450/mo in a building that needs facade work in 5 years is a special-assessment time bomb that will eat 3 years of cash flow.
For any condo or townhouse listing, the right reaction to a high HOA isn't "I'll subtract it from my cash flow." It's "let me request the HOA's last 2 years of financials, reserve study, and meeting minutes." If the seller can't produce them quickly, walk.
5. The building was built before 1940 and the listing doesn't mention recent capex
Old housing stock isn't inherently bad — there are great pre-1940 rentals across Philadelphia, Cleveland, Indianapolis, KC, and the older Northeast. But the deferred-maintenance bill catches up. Roof, electrical service upgrade, plumbing replacement, foundation work, lead paint, knob-and-tube wiring, asbestos: each is a $5-20k surprise on a property that wasn't recently rehabbed.
If the listing description doesn't prominently mention "new roof 2023" or "updated electrical and plumbing," assume you're inheriting all of it. Budget 1-2% of purchase price as a first-year capex surprise even on top of your maintenance reserve.
6. The seller is "motivated" for a reason they won't explain
Motivated sellers are great. Motivated sellers who give you a clear reason (relocation, inheritance, divorce, retirement) are even better — you can pattern-match the urgency and price accordingly.
But when the listing screams "motivated seller" or "quick close" and there's no story, the story is usually one of three things: (a) the property has a hidden defect they don't want to disclose until inspection, (b) there's a tenant problem (squatter, non-paying long-term tenant, drug history), or (c) it's priced wrong for the market and they want speed before competing listings drop their price too. Any of those changes your offer math. Find out which.
7. The DSCR is below 1.0 at your actual financing
DSCR (debt service coverage ratio) is NOI divided by annual debt service. Below 1.0 means the property doesn't cover its mortgage from rent — you're feeding it. Below 1.25 is below the typical lender threshold for an investment-property loan, which limits your financing options to higher-rate DSCR lenders, hard money, or more cash down.
Critical: this needs to be calculated at the rate and term YOU can actually get, not the seller's assumed rate. A deal that's 1.4 DSCR at 5% rate becomes 1.05 DSCR at 8% rate. The 60-second triage version: gross rent × 0.6 (approximate NOI) compared to annual P&I. If it's less than 1.0× annual P&I, walk unless you're bringing a lot of cash.
The 60-second test in practice
Open the listing. Check (1) rent-to-price ratio, (2) property tax in the listing (or pull it fast), (3) photo gaps, (4) HOA if applicable, (5) year built + capex hints, (6) listing urgency tone, (7) rough DSCR at YOUR rate.
If 5+ flags trip, move on. If 1-2 flags trip, you've got an interesting deal that needs the full underwrite. Open TrueCap, paste the address, and let the analyzer do the rest — the form auto-fills rent, mortgage rate, and property tax, so you're running real numbers in 60 seconds.
The best investors I know aren't running magic — they're running this filter, fast, on everything. The discipline isn't in the spreadsheet. It's in saying no to the 90% of listings that don't pass, so the underwriting hours go to the 10% that might.