Updated · Part of the CRE investment glossary
What a T-12 contains
A T-12 has one row per income or expense account and one column per month, plus a twelve-month total. Income rows usually include rent, vacancy, concessions, bad debt and other income. Expense rows cover taxes, insurance, utilities, repairs, payroll, management and administration. The bottom line is net operating income.
It is usually exported from the property manager’s accounting system and is rarely audited. Ask whether it is on a cash or accrual basis, because a late tax bill or a prepaid insurance premium can land in the wrong month.
Buyers and lenders commonly ask for the T-12 together with the prior one or two calendar-year statements, so they can see the trend in income and each expense line rather than a single year.
T-12 vs T-3 annualized
A T-12 smooths out seasonality but lags when income is changing. If rents have risen during the year, the full twelve months understate what the building earns today. A T-3 annualized figure multiplies the last three months by four; a T-1 annualized figure multiplies the last month by twelve.
Some buyers and lenders use a T-3 or T-1 annualized income figure with T-12 expenses when rents have clearly moved. Shorter windows are more current and easier to distort: one strong month, a seasonal peak or a delayed bill can swing the result.
T-3 annualized = (last 3 months) × 4 T-1 annualized = (last month) × 12
Worked example: three ways to read the same year
A value-add property collected $70,000 of income in each of months 1 to 6 and $74,000 in each of months 7 to 9, then $78,000, $79,000 and $80,000 in months 10 to 12. The T-12 total is $420,000 + $222,000 + $237,000 = $879,000. Twelve-month operating expenses are $410,000.
Each method gives a different NOI. At a 6% cap rate, the gap between the T-12 and the T-3 annualized reading is $69,000 of NOI, or $1,150,000 of value — which is why the method belongs in the offering memo and the investment committee memo, not just the model.
| Method | Income | NOI | Value at 6% |
|---|---|---|---|
| T-12 | $879,000 | $469,000 | $7,816,667 |
| T-3 annualized | $237,000 × 4 = $948,000 | $538,000 | $8,966,667 |
| T-1 annualized | $80,000 × 12 = $960,000 | $550,000 | $9,166,667 |
How the T-12 and rent roll work together
The rent roll shows the leases in place today; the T-12 shows what was actually collected and spent. Underwriting uses both:
- Compare annualized rent from the rent roll with rental income on the T-12. The gap should be explained by vacancy, concessions, bad debt and rent changes during the year.
- Check T-12 income against bank deposits for the same months.
- Normalize expenses: remove one-time items, reset property taxes to the expected post-sale assessment, use a current insurance quote and a market management fee.
- Build year one of the pro forma from the normalized T-12 and the rent roll, then state every assumption that moves it.
Common mistakes
Most T-12 errors come from reading it as finished numbers:
- Leaving in one-time income, such as an insurance recovery or a lease termination fee.
- Missing an expense paid once a year that fell outside the twelve-month window.
- Capital work booked as repairs, which understates NOI, or the reverse, which overstates it.
- Annualizing a short period that includes a seasonal peak.
General information, not legal, tax or investment advice. Your operating agreement, offering documents, counsel and CPA govern your deal.