Quick answer
A seller's pro forma is a projection designed to make a deal look attractive. It is not a neutral analysis. The standard pattern: overstated rent, understated vacancy, missing expenses, and no capital reserves. Before you trust any number in a seller's pro forma, verify it line by line against your own sources.
This article walks through that process — what to look for, where sellers most commonly inflate the numbers, and how to rebuild the model on your own terms.
Who this is for
This is for investors reviewing a property package, listing, or offering memorandum. It covers how to audit each section of a seller's pro forma — income, vacancy, expenses, and the implied return metrics — and how to replace optimistic assumptions with defensible ones.
For a step-by-step guide to building your own analysis from scratch, see How to Build a Rental Property Pro Forma from Scratch. For the repeatable 7-step underwriting process, see How to Analyze a Rental Property.
What a seller's pro forma typically looks like
A basic seller's pro forma includes:
- Gross rental income (usually shown at full occupancy)
- A vacancy deduction (often 3–5%)
- Operating expenses (often incomplete)
- Net Operating Income (the number they lead with)
- An implied cap rate
The problem is that each of these inputs is a choice the seller made. You can almost always find a version of those inputs that produces a higher cap rate. Sellers find that version.
Step 1: Audit the rent assumption
The first number to check is gross rental income. Pull your own comps.
How to check it:
- Search active rental listings within a half mile for comparable properties — similar bedroom count, square footage, and condition.
- Look at recently signed leases if you can access them (Rentometer, Redfin Data Center, Apartment List, local property managers).
- If the property is occupied, confirm whether in-place rent is at, above, or below what similar units are actually commanding.
Common seller inflation tactics:
- Using above-market in-place rent as the going-forward assumption
- Projecting a rent increase without evidence that the market supports it
- Combining multiple unit types at the highest possible rate for each
Step 2: Audit the vacancy assumption
Vacancy rate is where sellers most reliably inflate the numbers. A seller who shows 3% vacancy for a ZIP code with a 9% census vacancy rate has overstated effective income by six percentage points.
How to check it:
- Look up the rental vacancy rate for the ZIP code or census tract on data.census.gov (American Community Survey, table B25004).
- The U.S. rental vacancy rate tracked by FRED provides national context — Q1 2026 was 7.3% — useful when a seller claims an unusually low rate.
- Ask a local property manager what average days-on-market looks like for similar units.
- The ratio of active listings to total rental units in a neighborhood gives a real-time signal.
A reasonable baseline for most residential markets is 7–10%. If a seller shows below 5%, ask for the evidence. If they cannot produce it, use the census rate.
See Vacancy Rate: The Metric That Can Break a Rental Pro Forma for a deeper look at how to set and defend a vacancy assumption.
Step 3: Audit the expense assumptions
This is the section where sellers most commonly leave things out entirely. Go line by line.
What is typically missing or understated
| Expense line | What sellers often show | What to use |
|---|---|---|
| Property taxes | Listing sheet value | County assessor or treasurer — verify post-sale assessment risk. Tax Foundation state data for context. |
| Insurance | Rough estimate or nothing | Get an actual landlord insurance quote |
| Property management | 0% (assumes you self-manage) | 8–12% of collected rent, plus leasing fees |
| Maintenance | 0% or a flat $500/year | 1% of property value/year as a baseline |
| Capital reserves | Not included | 5–10% of gross rent set aside monthly |
| Leasing and turnover | Not included | One month rent equivalent per year is a reasonable baseline |
When you add a management expense, realistic maintenance, and capital reserves to a seller's pro forma, it is common to find that NOI drops 20–30% from what the seller showed.
For a reference on what the IRS considers deductible rental expenses — useful when evaluating whether a seller has omitted legitimate costs — see IRS Publication 527 (Residential Rental Property).
The management expense question
Many beginner sellers and investors leave management off entirely and argue "I'll self-manage." This is a legitimate choice, but it should not make a deal look better on paper. If you include management costs and the deal still works, self-managing becomes upside — bonus cash you keep by doing the work yourself. If the deal only works because you exclude management, you are working for free and one decision away from a deal that does not cash flow.
Step 4: Recalculate NOI from your inputs
Once you have rebuilt the income and expense assumptions, recalculate NOI from scratch.
Effective gross income = Gross rent × (1 − your vacancy rate)
NOI = Effective gross income − Your verified operating expenses
Run this in the NOI calculator. The calculator forces you to enter each component separately, which surfaces discrepancies you might miss in a spreadsheet.
Then check two things:
1. What cap rate does your NOI produce at the asking price?
Cap rate = Your NOI ÷ Asking price
Compare this to the seller's claimed cap rate. If your NOI is materially lower, the actual cap rate on the deal is materially worse than advertised. Use the cap rate calculator.
2. What does this imply about a fair purchase price?
If you know the market cap rate for this property type and location, you can back into a fair price:
Fair value = Your NOI ÷ Market cap rate
This is the number to anchor your offer to. If the asking price is above fair value at your NOI and market cap rate, you are being asked to pay a premium for optimistic assumptions.
Step 5: Check DSCR against your actual loan
Run DSCR — NOI divided by annual debt service — using your NOI and the actual debt service from your expected loan terms.
DSCR = Your NOI ÷ Your annual debt service
Most lenders require 1.20 or higher. More importantly, a DSCR below 1.0 means the property cannot pay its own mortgage from rental income.
If a seller's pro forma shows a clean DSCR but your recalculated NOI is 25% lower, you may find the deal does not qualify for DSCR-based financing at all. Test it in the DSCR calculator.
Step 6: Run the cash flow stress test
With your rebuilt NOI and verified expenses, calculate cash flow at a stressed scenario:
- Rent $100–$150/month lower than your base case
- Vacancy two to three points higher than your assumed rate
- One major repair drawn from reserves in year one
What to do when the numbers do not add up
Most of the time, your recalculated numbers will be worse than the seller's. Here are productive responses:
Negotiate on price. If your NOI is $10,000 and the market cap rate is 7%, a fair value is roughly $143,000. If the asking price is $175,000, you have a data-driven anchor for a lower offer.
Request a repair allowance. If deferred maintenance is driving your expense assumptions higher, ask the seller to reduce the price or credit the cost at closing.
Walk away. Not every deal can be fixed by negotiating. If the market vacancy is structural, the expense stack is unavoidable, and the price does not move, the deal does not work. Moving on is the right decision.
Question the strategy. Sometimes the deal does not work as a buy-and-hold but might work differently — as a house hack, or at a lower purchase price for a value-add play. Make sure you are evaluating the right strategy for the property.
Common red flags in seller pro formas
| Red flag | What it usually means |
|---|---|
| Vacancy below 3% | Seller is showing best-case occupancy, not market reality |
| No management expense | Analysis assumes free self-management labor |
| No capital reserves | Large future repairs are being hidden |
| Rent above current active comps | Either above-market tenant or inflated projection |
| Taxes from listing sheet only | Post-sale reassessment risk not disclosed |
| "Upside" built into the income | Projected rent increases not yet achieved |
| Trailing 12 months income on an older rent roll | May not reflect current market vacancy |
FAQ
How different is a seller pro forma from a real analysis?
It varies widely, but a 15–25% difference in NOI between a seller's pro forma and a realistic analysis is common. In the worst cases — high-vacancy markets, missing expenses, above-market in-place rents — the difference can be 40% or more. The gap almost always makes the deal look worse, not better, when you substitute real inputs.
Do sellers intentionally mislead buyers?
Sometimes, but often the issue is structural: sellers present their best-case scenario because that is what maximizes their price. They are not lying; they are negotiating. Your job is to verify.
Should I share my own analysis with the seller?
In negotiations, sharing your recalculated NOI and the fair value it implies can be a legitimate tactic if the gap is large enough and you want to justify a lower offer. It signals that your offer is not arbitrary — it is grounded in your numbers, not theirs.
What if the seller insists their numbers are correct?
Ask for documentation: recent leases, bank statements confirming rent, tax bills, insurance invoices, maintenance receipts. A seller who cannot support the pro forma with documents is asking you to trust instead of verify.
Is this different for commercial or multifamily properties?
The same principles apply, but the numbers are larger. Multifamily packages often include a trailing 12-month income statement and a rent roll. Verify the rent roll against actual leases. Confirm occupancy with your own physical inspection, not just the paperwork.
How Temelios can help
This article is for education only and is not financial, legal, tax, or investment advice. Consult qualified professionals before buying property.