Why last twelve months (LTM) matter to a first-time founder
A rolling 12-month view smooths seasonality while staying more current than the latest completed annual accounts. Investors and lenders use it to compare revenue, profit or cash measures. Founders must still disclose the end date and calculation basis.
Examples of last twelve months (LTM)
On 30 September, a founder adds revenue from 1 October last year through 30 September this year. The total is ¥48 million, so LTM revenue is ¥48 million. Next month, October enters the period and the oldest October drops out.
Common misunderstanding
It is not “this year so far”. Year-to-date starts at the financial year’s beginning and may cover fewer than 12 months. LTM always covers 12 months, but comparisons can still mislead if acquisitions, accounting policies or one-off events changed.
When to use it
Use LTM when a recent 12-month total is more useful than stale annual accounts or a seasonal quarter. Label the end date, currency and metric clearly. Reconcile figures to source accounts, especially when presenting an investor update, valuation or covenant calculation.