How to spot a bad rental deal in 60 seconds — 7 red flags

Many experienced investors build 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 seven red flags to run through, in this order.

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: FHFA's purchase-only house price index rose about 59% from January 2020 to June 2026, while the CPI for rent of primary residence rose about 33% through August 2026. 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%). At an assumed 7% rate with 25% down, principal and interest alone run about $1,500 a month, leaving roughly $300 for taxes, insurance, vacancy, and repairs — so expect negative cash flow. 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. The parcel's property tax is above 2% of value

Property tax is a recurring cost set by the local assessment and tax rate, not by the deal, and it can change from year to year. In Illinois and New Jersey, the median real estate tax bill on owner-occupied homes is about 1.9% of the median home value, and in Texas about 1.3% (Census ACS 2024) — and rates vary by taxing district, so check the parcel's actual bill. A deal that looks great on rent-to-price can see its cash flow shrink sharply once the actual tax bill is in.

Always pull the actual current tax bill from the local assessor or tax office for the specific parcel. The seller's last bill may not reflect the post-sale or post-reassessment amount — in some jurisdictions a transfer of ownership typically results in a reassessment.

3. The listing photos are aggressively staged but exclude a room

This sounds like a soft signal, but it is worth a question. 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, ask why and budget for the possibility that the room needs work.

Related signal: the photos look professionally staged but the comps in the neighborhood are wholesaler-flagged. Check whether you're looking at a polished wholesaler listing, and price it from sold comps and your own numbers rather than the marketing.

4. The HOA amount or condition is unresolved

HOA dues, reserves, planned work, insurance, delinquencies, litigation, rental restrictions, and special assessments can change the property's costs and permitted use. A listing amount alone does not resolve those questions.

Request the current governing documents, budget, financial statements, reserve information, meeting materials, insurance, and assessment disclosures appropriate to the property. Review missing or incomplete evidence with the relevant local professionals and keep the risk unresolved in the model; a calculator should not tell you to proceed or terminate.

5. Building systems and recent capital work are undocumented

Age alone does not establish condition or repair cost. Roof, electrical, plumbing, structure, moisture, environmental materials, and mechanical systems require property-specific inspection and, where appropriate, specialist review.

Ask for permits, invoices, warranties, service records, and current condition evidence. Obtain local written estimates for identified work and disclose a separate uncertainty reserve instead of assuming a universal percentage or generic repair band.

6. Marketing urgency is substituting for evidence

Phrases such as "motivated seller" or "quick close" do not prove property condition, tenant status, value, or the seller's reason for the requested timeline.

Verify disclosures, title, leases and collections, property condition, comparable market evidence, and contract deadlines without inferring a hidden defect or tenant problem from the listing language.

7. Model DSCR is based on unverified financing or NOI

DSCR divides a defined NOI by a defined debt-service amount. The result changes with the rent and expense evidence, rate, term, amortization, maturity, and the chosen convention. Lenders may calculate it differently and apply additional requirements. (See the DSCR loans guide.)

Enter a current written financing proposal and property-specific NOI evidence. Use the ratio to identify questions for the lender and to compare disclosed scenarios—not as a prediction of approval or an instruction to buy, pass, or change leverage.

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.

The number of open questions does not decide the acquisition. Use them to scope due diligence and identify unresolved assumptions. Open TrueCap, paste the address, review the editable HUD rent and FRED rate benchmarks, then enter a local property-tax bill or reviewed rate before relying on the preliminary result.

A fast screen should preserve uncertainty, not erase it. Spend deeper review time where the evidence can be obtained and the unresolved risks are material.