Glossary
Trailing Twelve Months (TTM)
Trailing twelve months, or TTM, is the most recent twelve consecutive months of financial results, regardless of where the fiscal year ends. In M&A it is the period buyers care about most, because it is the closest thing available to what the business is earning right now. At Treewalk, every Quality of Earnings report we issue presents TTM alongside the two prior fiscal years, and the gap between them is usually where the negotiation lives.
Why TTM instead of the last fiscal year
A fiscal year ending nine months ago describes a business that no longer exists. Staff have changed, prices have moved, customers have come and gone. A buyer signing today is buying the current run rate, not last December’s.
TTM solves that by rolling forward. If you are looking at a business in September and its year ends in December, the TTM period runs from the previous October through this September. It picks up the most recent three quarters of actual trading and drops the equivalent quarters from the prior year.
The calculation itself is simple:
- Take the most recent completed fiscal year
- Add the year-to-date results for the current year
- Subtract the same year-to-date period from the prior year
- The result is twelve consecutive months ending at your most recent close
Where TTM gets misleading
This is the part that matters, and it is where we spend most of our time on a deal.
TTM is a period, not a quality standard. Rolling twelve months of unreliable monthly numbers produces an unreliable annual number, and small owner-managed businesses frequently do not close their months properly. Adjusting entries land at year end, accruals are booked once a year by the external accountant, and the interim months carry none of it.
The single most common problem we find is a TTM built from interim months that were never adjusted. The fiscal years look clean because the outside accountant fixed them in one pass at year end. The stub period is raw. Splice them together and you get a TTM that quietly overstates earnings, because twelve months of revenue met only three months of properly accrued cost.
Three other traps show up regularly:
Seasonality.
A TTM ending immediately after peak season looks very different from one ending after the trough, even though the twelve-month span is the same length.
Cash-basis books.
If the target reports on cash, the TTM has to be converted to accrual before it means anything. This is routine work on our engagements, not an exception.
One-time events inside the window.
A large non-recurring gain or a lawsuit settlement sitting inside the trailing period distorts it in exactly the way EBITDA normalization adjustments exist to correct.
How we present TTM in a Quality of Earnings report
We show three periods side by side so the trend is visible rather than asserted.
| Period | What it shows |
|---|---|
| Fiscal year, two years back | The baseline, fully closed and typically audited or reviewed |
| Fiscal year, one year back | The comparison point, fully closed |
| Trailing twelve months | The current run rate, adjusted to accrual and normalized |
Each period carries the same adjustment tiers: management’s proposed adjustments, our incremental adjustments, and potential adjustments where the facts are unclear. Presenting TTM without that treatment invites a buyer to compare an adjusted fiscal year against an unadjusted stub, which is not a comparison at all.
TTM also feeds the working capital analysis. When we set the net working capital peg, we look at the TTM average alongside the last ninety days and the two prior fiscal years, then pick the benchmark that best reflects how the business actually operates.
Frequently asked questions
Is TTM the same as LTM?
Yes. Last twelve months and trailing twelve months describe the same period and are used interchangeably. LTM appears more often in banking materials, TTM more often in accounting and diligence reports.
Is TTM the same as a forecast?
No. TTM is entirely historical, made up of months that have already happened. A forecast is forward-looking. Buyers use TTM as the anchor precisely because it is actual, and treat the forecast with more scepticism.
Can TTM be higher than the last fiscal year and still be a warning sign?
Absolutely, and this is worth watching. Growing TTM built on a single new customer, a price increase that has not been tested for churn, or unadjusted interim months can all flatter the picture. We look at what is driving the growth, not just its direction.
Does the TTM figure set the purchase price?
It heavily influences it. Most lower-middle-market deals are priced as a multiple of normalized earnings, and TTM is usually the period that multiple gets applied to. That is exactly why the adjustments behind it get tested so hard in buy-side due diligence.
Where to next
If you are evaluating a target and the TTM figure looks better than the fiscal years behind it, that is worth understanding before you sign a letter of intent. Our transaction advisory services team tests these periods for a living. The related pieces on EBITDA normalization adjustments and proof of cash cover how we verify them. To scope a deal, email Avnit Sekhon at avnit.sekhon@treewalk.com.
