How to Underwrite a Deal Without Falling for “Potential Rent”

[James Jones]

One of the quickest ways to ruin your cash flow is by underwriting deals based on imaginary numbers. Every wholesaler has a story about “what this could rent for.” Every seller has a cousin who said, “You can easily get $1,600.”

None of that pays the mortgage.

If you want predictable income, you underwrite based solely on verified, current, rent-ready numbers, not future fantasies.

Here’s the exact approach we use:

1. Treat “potential rent” as noise.

If it’s not rented today, and if the housing authority hasn’t approved it, it’s not real.

We only use:

• Current rent (if occupied)

• Verified Section 8 payment standard for THAT bedroom count

Not “after you add a wall.”

Not “after a full rehab.”

Not “after the market improves.”

2. Underwrite the deal in its current condition.

Investors make a fatal mistake assuming the deal is already fully renovated on paper. No.

You underwrite as-is.

Then separately add:

• Rehab cost

• Holding cost

• Leasing/inspection delays

• Initial maintenance spikes

This keeps your expectations grounded.

3. Verify Section 8 rents before you walk the property.

We only look at deals where we already know the realistic voucher rent for that bedroom count and zip code. If a 2-bed pays $1,050, the deal is built around $1,050, not wishful 3-bed pricing.

4. Stress-test the deal three ways.

• Worst case: Inspection fails, low rent, long turn

• Base case: Standard rent-ready condition

• Best case: New voucher, max rent

If it only works in the “best case” column, it’s not a deal.

5. Future rent increases are gifts, not a business plan.

MHA raises rents regularly, but you never rely on it to justify a purchase.

Cash flow has to work today, not someday.

6. Use real operating numbers.

Most investors cheat. We don’t.

Minimum:

• 5 percent vacancy

• 10 percent maintenance

• 5 percent CapEx (more if distressed)

• Full PITI

If the deal still cash flows, now it’s worth doing.

Real underwriting is boring, and boring is exactly why it works.

Invest based on what the property is right now, not what someone wishes it could be.

What’s the craziest “potential rent” number someone has pitched you this year?