NOI reconciliation: closing the gap between reported and reconstructed
The seller's NOI and the NOI you rebuild from the documents almost never agree. The reconciliation between them is the most valuable number in the package.
How to read a T-12 the way an underwriter does
A trailing-twelve operating statement hides as much as it shows. Here is how experienced buy-side underwriters read a T-12 line by line before trusting a single number.
A trailing-twelve-month operating statement — the T-12 — is the most-cited and least-questioned document in a multifamily deal package. It looks authoritative: twelve columns of actuals, a tidy net operating income at the bottom. But a T-12 is a narrative the seller chose to tell, and the way it is assembled decides how flattering that narrative is. Reading it well means separating what the property actually did from how the statement was framed.
Start with the period, not the numbers
Before you read a single dollar figure, confirm what the twelve months actually are. A true trailing twelve ends in the most recent closed month. Sellers frequently present a T-12 that ends several months stale, or splice a strong recent quarter onto an older base to annualize a number the property has never actually earned over a full year.
- Confirm the exact start and end month, and that all twelve are consecutive and closed.
- Watch for annualized or partial-period figures dressed up as trailing actuals.
- Check that the statement basis is consistent — cash vs. accrual should not switch mid-year.
Income: reconstruct it, do not accept it
Gross potential rent, loss-to-lease, concessions, vacancy, and other income each carry assumptions. The single most common inflation is understating economic vacancy — showing physical occupancy while quietly omitting the concessions and non-paying units that reduce collected rent. Rebuild effective gross income from the rent roll rather than trusting the summary line, and the gap between the two is often the first real finding of the deal.
The reconciliation habit
Any income line on the T-12 that you cannot rebuild from the rent roll or a bank deposit is an assumption, not an actual. Treat it as unresolved until it reconciles.
Expenses: look for what is missing
Expense manipulation is usually subtraction, not addition. Management fees below market, deferred maintenance booked as capital, property taxes that have not yet reassessed to the purchase price, and payroll that will not survive a management change all understate the real operating cost. The most defensible expense ratio comes from normalizing each line to what a new owner will actually pay — not from the seller's trailing figure.
The three expenses that reset at sale
- Property taxes — reassessment to the new basis can move NOI materially in many jurisdictions.
- Insurance — trailing premiums rarely reflect current market pricing.
- Management and payroll — in-place staffing is often below a third-party managed cost.
Only then, net operating income
By the time you reach NOI, you should have already rebuilt income from the rent roll and normalized expenses. The reported NOI becomes a checkpoint, not a conclusion — a number to reconcile against your reconstruction. When the two diverge, the difference is the deal's real story, and it is exactly the kind of gap our NOI reconciliation work is designed to make visible.