Glossary
Trailing Twelve Months (TTM): Meaning, Calculation and How Diligence Uses It
TTM, or trailing twelve months, is a company’s results for the most recent twelve consecutive completed months, whatever its fiscal year end. In an acquisition, it brings the analysis beyond the last fiscal year while retaining a full annual cycle. It is historical performance, not a forecast of the next twelve months.
What does TTM mean in finance?
TTM is a rolling period. Instead of the last fiscal year, it takes the latest twelve months that have closed. If a company’s year ends on December 31 and its June books are closed, the TTM runs from July 1 of last year to June 30 of this year.
It is used for revenue, EBITDA, net income and per-share figures, and in ratios such as price to earnings or debt to EBITDA. LTM (last twelve months) means the same thing.
How do you calculate TTM?
Use the last full fiscal year, add the current year to date, and subtract the same year-to-date period from the prior year.
TTM = last fiscal year + current year to date – prior year same period
A worked example, figures in thousands, for a company with a December year end analyzed after its June close (illustrative, not client data):
| Line | Fiscal 2025 (Jan to Dec) | Plus: Jan to Jun 2026 | Less: Jan to Jun 2025 | TTM (Jul 2025 to Jun 2026) |
|---|---|---|---|---|
| Revenue | 4,800 | 2,600 | 2,300 | 5,100 |
| Expenses excluding interest, tax, depreciation and amortization | 4,180 | 2,300 | 2,030 | 4,450 |
| EBITDA | 620 | 300 | 270 | 650 |
You can also add the twelve monthly figures directly. Both methods should give the same answer when they use the same periods, consolidation scope and accounting adjustments. Agreement proves the arithmetic reconciles; it does not prove the underlying books are complete.
Does the trailing twelve months include the current month?
For a monthly transaction analysis, use the latest twelve completed months. Do not mix a partly completed month with eleven full months. If management reports a daily trailing measure or a provisional month, label the basis explicitly and reconcile it before comparing it with closed monthly results.
Why do buyers rely on TTM?
A fiscal year that ended months ago describes a business that has since changed: prices, customers, staff and costs move. TTM picks up the most recent actual trading. In our quality of earnings work, the analysis normally presents two prior fiscal years alongside the TTM, so the direction of the business is visible rather than asserted. Ask the lender which earnings period, adjustments and coverage tests it will use; a favourable fiscal-year result does not settle those questions.
Practitioner note: how does diligence adjust a TTM figure?
The calculation is mechanical. The work is in whether the twelve months underneath it are reliable. Two issues from our transaction discussions show why the period boundary matters.
1. A full-year entry posted in one month. An annual correction can be booked entirely at year end: a payroll tax true-up, an accrual, an insurance adjustment. The fiscal year is right in total, but December carries the whole year’s correction. A TTM that includes December, but only half of that fiscal year, picks up the full entry. Our team traces the correction to the months it actually relates to, then recomputes the TTM. Equal monthly allocation is appropriate only when the evidence supports it.
2. Cut-off at the boundary month. In a project-revenue review discussion, our transaction lead singled out the interim TTM boundary because it had not necessarily received the same close procedures as year end. The question was which work belonged before or after that date. An invoice date alone does not answer it: examine the contract, delivery or progress evidence and applicable recognition policy.
Continuing the example above, suppose the December books included a full-year payroll credit of 120, earned evenly across 2025 (half relating to January to June 2025, outside the TTM), and 40 of June revenue was invoiced in advance for work performed entirely in August, with no related cost correction needed:
| Item | EBITDA effect on TTM |
|---|---|
| Reported TTM EBITDA | 650 |
| Spread the December full-year credit: remove the 60 relating to months outside the TTM | -60 |
| Defer June revenue billed for August work | -40 |
| Diligence adjusted TTM EBITDA | 550 |
Neither adjustment reflects a change in the business. Both change the figure a price multiple could be applied to. Other checks before using the TTM:
Interim months never adjusted.
If the outside accountant only fixes accruals at year end, the stub months carry none of them, and the TTM can understate costs.
Cash-basis books.
A growing business collecting deposits can show cash-basis earnings above accrual earnings. The TTM has to be restated to accrual before it means anything.
A one-off inside the window.
An unusually large single sale or a non-recurring cost inside the twelve months is assessed as a normalization adjustment.
Seasonality.
A TTM is twelve months long, so it captures a full season, but where the window ends still affects working capital balances and which cut-offs matter.
What should I request to validate a TTM bridge?
| Check | Evidence | What a mismatch can mean |
|---|---|---|
| Period arithmetic | Twelve monthly results and fiscal-year/YTD bridge | Missing or duplicated month, different entity scope or a restated comparison |
| Annual journals | Journal listing, posting date and supporting calculation | A full-year correction concentrated in one month |
| Revenue boundary | Contracts, invoices and delivery/progress evidence | Billing date substituted for when revenue was earned |
| Expense boundary | Supplier invoices, payroll and subsequent payments | Costs incurred before the boundary booked afterwards |
| Recurring versus one-off | Customer history and adjustment support | Recent growth or a temporary event presented as sustainable earnings |
Under IFRS 15, revenue follows satisfaction of performance obligations. A target using another framework needs its own policy assessed. The example above assumes the work is earned in August; a contract recognised over time may require a different cut-off calculation.
How is TTM used to set the working capital peg?
Our transaction team’s usual starting point for the net working capital peg is a trailing twelve month average of working capital. It is a starting point, not a rule. When a business is growing or shrinking quickly, or changed accounting systems partway through the period, a twelve-month average can describe a business that no longer exists, and a trailing three or six months, or a different method, may be more representative. The choice is explained in the analysis so both sides can test it.
Frequently asked questions
Is TTM the same as LTM?
Yes. Trailing twelve months and last twelve months describe the same period. Check that both labels use the same end date and adjustments before comparing them.
Is TTM a forecast?
No. TTM is entirely historical. A forecast or run rate projects forward, and its assumptions should be shown separately from historical results.
What is TTM revenue?
Revenue for the most recent twelve completed months, calculated the same way as the example above.
Can a TTM higher than the last fiscal year be a warning sign?
It can. Growth driven by a single new customer, a large one-off sale, or months that were never properly closed can all lift a TTM. Diligence looks at what is driving the change, not just its direction.
Does the TTM figure set the purchase price?
Often it is the period a multiple is applied to, which is why the adjustments behind it are tested closely in buy-side due diligence. Pricing depends on the transaction.
Where to next
If a target’s TTM looks stronger than the fiscal years behind it, it is worth understanding why before signing a letter of intent. The QoE readiness check shows the questions a diligence team is likely to ask about your periods and cut-offs. For how the full analysis is built, read what a quality of earnings report contains and proof of cash. To discuss a specific deal, contact our transaction advisory team.
Treewalk provides advisory services and does not perform audit or assurance engagements.
