How to Read a T-12 and Spot a Massaged Number (2026)

A seller’s trailing twelve month statement and your own underwriting of the same building can differ by more than $18,000 of net operating income, and not a single number in the seller’s file has to be false for that gap to exist. The T-12 is a record of what the current owner spent. It is not a forecast of what you will spend.

This post covers how to read a T-12 line by line, the six places the number quietly flatters the seller, and a full worked example on an 8-unit building where restating the statement moves the implied value by roughly $252,000. By the end you will have a repeatable process you can run on any operating statement in about twenty minutes.

What a T-12 is, and what it is not

A T-12, also called a trailing twelve or an annualized operating statement, is a month by month record of income and expenses for a property over the last twelve months. Twelve columns, one per month, plus a total column. Income at the top, operating expenses below, net operating income at the bottom.

It is the most useful document a seller will hand you, because it is actual history rather than projection. It is also the most misread, for three reasons. It reflects the seller’s cost structure, not yours. It reflects the seller’s accounting choices about what counts as an operating expense. And it reflects twelve specific months, which may or may not resemble the next twelve.

Learning how to read a T-12 means learning to separate those three effects. Anyone who takes the bottom line at face value is buying the seller’s assumptions at full price.

The restatement framework

You are not auditing the seller. You are rebuilding one number using your inputs:

Restated NOI = Effective Gross Income (your vacancy assumption) − Operating Expenses (your actual costs)

Effective gross income. Start with gross scheduled rent, which is every unit at its current lease rate for twelve months. Subtract your vacancy and credit loss assumption, not the seller’s. Add other income only where it is contractual or documented for the full period, such as parking, pet rent, or laundry collections you can tie to deposits.

Operating expenses. Every recurring cost of running the property, excluding mortgage payments, depreciation, and capital improvements. The test is whether the cost repeats annually and whether it survives a change of ownership.

The three lines that are almost never on the statement. Property management, replacement reserves, and your own reassessed property taxes. A self-managing owner shows no management fee. Nobody books a reserve they did not fund. And your tax bill is set by what you pay for the building, not what the seller paid a decade ago. Those three omissions do more damage to a pro forma than every other adjustment combined.

Worked example: an 8-unit at $1,200,000

Eight units at $1,300 a month. The seller’s T-12 shows:

• Gross scheduled rent: $124,800
• Vacancy and credit loss at 2 percent: $2,496
• Other income: $3,600
• Effective gross income: $125,904
• Operating expenses: taxes $11,200, insurance $6,400, common utilities $4,900, repairs and maintenance $9,800, turnover $1,800, landscaping and snow $2,600, management $0, reserves $0
• Total operating expenses: $36,700

Seller’s NOI: $125,904 − $36,700 = $89,204. Against the $1,200,000 asking price that is a 7.43 percent cap rate, and the expense ratio is 29.1 percent of effective gross income.

Now restate it. Vacancy goes to 7 percent, which is $8,736, bringing effective gross income to $119,664. Management comes in at 8 percent of that, or $9,573. Reserves go in at $300 a unit, or $2,400. A reassessment at your purchase price takes taxes to $14,500. Your broker quotes insurance at $8,900. The $9,800 repairs line includes a $7,400 roof section replacement, which is capital rather than operating, so ongoing repairs normalize to $450 a unit, or $3,600. Turnover goes to three turns at $900 instead of two.

Restated operating expenses: $14,500 + $8,900 + $4,900 + $3,600 + $2,700 + $2,600 + $9,573 + $2,400 = $49,173.

Restated NOI: $119,664 − $49,173 = $70,491.

The bridge from $89,204 to $70,491 is worth showing, because restatement cuts in both directions. Vacancy costs $6,240. Management costs $9,573. Reserves cost $2,400. Reassessment costs $3,300. Insurance costs $2,500. Turnover costs $900. Stripping the roof out of repairs gives back $6,200. Net change: $18,713.

At the asking price, $70,491 of NOI is a 5.87 percent cap rate. Priced at the 7.43 percent the seller advertised, the building supports about $948,300, roughly $252,000 below ask. Our cap rate guide walks through why the denominator matters as much as the numerator here.

What a normal expense ratio looks like

The fastest sanity check on any T-12 is operating expenses divided by effective gross income. The seller’s version of this building ran 29.1 percent. The restated version runs 41.1 percent. The second number is ordinary for small multifamily; the first is a flag.

There is no universal target, and anyone who quotes one without naming property type, age, utility structure, and tax jurisdiction is guessing. A newer building where tenants pay all utilities sits lower. A 1960s building on master-metered heat in a high tax county sits higher. What matters is the direction of the error: a ratio under 30 percent on an older small multifamily almost always means something is missing from the statement, not that the seller runs a tight ship.

The same logic applies to the vacancy line. The national rental vacancy rate was 7.3 percent in the second quarter of 2026, according to the U.S. Census Bureau. Your submarket may be tighter or looser, but a seller showing 2 percent is showing you twelve lucky months, not a durable operating assumption.

6 numbers sellers massage, and how to catch each

1. Vacancy that reflects luck rather than policy. A 2 percent vacancy line usually means one unit turned once and leased in a week. It is history, not a forecast. Fix: underwrite your submarket’s rate, and add credit loss separately for the tenants who stop paying.
2. Management shown at zero. Self-managing sellers book no fee, which silently prices your labor at nothing. Fix: add 8 to 10 percent of effective gross income for residential small multifamily, whatever you intend to do yourself.
3. Capital items parked in repairs, and repairs parked in capital. Both happen. A one-time roof in the repairs line understates NOI; routine maintenance capitalized above the line overstates it. Fix: pull the general ledger detail, then apply the IRS betterment, restoration, and adaptation standards to sort each item.
4. Property taxes frozen at the seller’s basis. In most jurisdictions a sale resets the assessed value, and the increase can be the single largest line change in your restatement. Fix: call the county assessor before you remove your inspection contingency and ask what the bill becomes at your contract price.
5. Insurance quoted on a legacy policy. A long-tenured owner may hold pricing no new buyer can get, especially in hail, wind, or wildfire territory. Fix: get your own bindable quote during due diligence, not a broker’s verbal estimate.
6. No replacement reserve anywhere on the statement. Roofs, water heaters, and parking lots fail on a schedule even in a year when nothing breaks. Fix: fund $250 to $400 per unit per year for stabilized small multifamily, and more if the major systems are past half life.

Each of these flows straight into the metrics you are using to decide. The adjustments that lower NOI lower your cap rate, and the ones that raise cash expenses lower your cash-on-cash return twice over, once through NOI and again through the reserve you now have to fund.

Your T-12 review checklist

1. Request the T-12 by month, not annualized, plus the current rent roll dated the same day.
2. Tie gross scheduled rent on the statement to the rent roll. Any variance is your first question.
3. Scan each expense line across all twelve columns and circle every month that is an outlier. Lumps are usually capital or a missed accrual.
4. Confirm which utilities the owner pays and which the leases push to tenants, then read two actual leases to verify.
5. Call the assessor for the post-sale tax estimate and your broker for a bindable insurance quote.
6. Add management, reserves, and your own vacancy assumption as three new lines.
7. Recompute the expense ratio and NOI, then price the building off your number instead of the seller’s.

The full sequence this checklist sits inside is in our complete guide to rental property analysis, which covers deal screening through close, and the seven numbers every analysis needs gives you the calculations to run once the restated statement is built.

When you want a second set of eyes on the statement

Restating a T-12 is not difficult. It is detailed, and it is easy to talk yourself into the seller’s assumptions when you want the deal. That is where an outside read earns its fee.

We build the restatement model, pull the lines that do not belong, and hand you a number you can take to a lender. Start with the free calculators if you want to run it yourself, or book a free 20-minute consult and bring the statement you are staring at.

A seller’s T-12 is an honest record of someone else’s year. Your job is to figure out what the next twelve months cost you.

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Simply Spreadsheets helps real estate investors and small business owners make confident decisions with clean, reliable numbers. Founded by Erin Onsager, a fractional CFO with more than 20 years of finance experience, the firm builds custom spreadsheets, financial models, and analysis that turn raw data into clear answers.