The actual operating performance of a property over the last 12 months.
The T-12 (Trailing 12 Months) is the actual operating statement of a property for the most recent 12-month period. T-12 is the gold standard data set for underwriting commercial real estate because — unlike pro forma — it reflects what the property has actually done, verified from real bank deposits, real expense payments, and real tax bills.
T-12 is the foundation of every commercial real estate underwrite. Sellers provide T-12 statements during diligence; lenders require them to size loans; buyers use them to verify pro forma assumptions. The T-12 cuts through marketing rhetoric — if a seller claims $300k of NOI but T-12 shows $240k, the T-12 is what the lender and buyer trust until proven otherwise.
T-3 (Trailing 3 Months) is the companion metric — actual operating performance over the most recent quarter, often annualized for comparison to T-12. T-3 reveals trends: rising rents, expense control improvements, or new problems that T-12 averages out. Sophisticated underwriters look at both T-12 and T-3 to understand both base performance and current trajectory.
T-12 quality varies dramatically. Institutional-quality T-12 comes from professional property management with full general ledger detail, vendor invoices supporting each expense, and bank statements reconciling income. Mom-and-pop T-12 might be a self-prepared QuickBooks export with vague expense categories and no supporting documentation. The diligence depth required varies accordingly.
For investors, the discipline is reading T-12 critically. Income line: does monthly collected rent reconcile to bank deposits? Are there suspicious income spikes or seasonal patterns? Expense line: are taxes, insurance, and reserves all included? Are there obvious one-time expenses (mid-year renovation) being normalized? T-12 isn't a finished underwriting answer — it's the starting point.
| T-12 reported total revenue | $285,000 |
| T-12 bank deposits (matched) | $282,500 |
| Difference | $2,500 (within tolerance) |
| T-12 expense lines: | |
| Property taxes | $32,000 ✓ (matches assessor) |
| Insurance | $8,500 ✓ (matches policy) |
| R&M | $24,000 — high for unit count, investigate |
| Reserves | $0 — should be ~$5,400 — adjust pro forma |
| Owner-paid expenses (not in T-12) | $0 — verify with owner |
| Adjusted NOI for underwriting | ~$15k below reported |
A property's operating statement for the trailing 12 months — actual income and expenses by month, aggregated for the year. The gold standard data set for underwriting.
T-12 is actual historical performance — what the property did. Pro forma is projected future performance — what the property could do. Lenders trust T-12; pro forma is supportive but not load-bearing.
T-3 is the most recent 3 months, usually annualized for comparison. T-12 is the full year. T-3 captures current trends and trajectory; T-12 averages out seasonality and short-term variation.
Closely — T-12 income should approximate rent roll × 12, less vacancy and credit loss. Large discrepancies indicate either reporting errors or material vacancy / collection issues that need investigation.
Often not — mom-and-pop T-12 statements frequently omit reserves for replacement. Sophisticated underwriting always adds reserves (typically $300–500/unit/year on multifamily) to get to a realistic NOI.
Matrix underwrites commercial loans on trailing 12-month actuals, not seller pro forma. Real numbers, real loans.
