LTM and NTM in one line: LTM (last twelve months) uses the most recent twelve months of actual reported results. NTM (next twelve months) uses the next twelve months of forecast results. When you see "NTM" in finance it simply means forward-looking — an NTM multiple divides today's valuation by tomorrow's expected earnings, which is why fast-growing companies always look cheaper on NTM than on LTM.

"Why is this company's LTM multiple so much higher than its NTM multiple?" is a question that trips up a lot of candidates — not because the math is hard, but because it's easy to answer with the calculation and forget the interpretation the interviewer is actually testing for.

Step 1: State What Each Multiple Divides By

Before touching any numbers, show the interviewer you know the definitions:

  • LTM EV/EBITDA = Enterprise Value ÷ trailing twelve months' actual EBITDA
  • NTM EV/EBITDA = Enterprise Value ÷ next twelve months' estimated EBITDA (usually consensus)

Since Enterprise Value is the same in both, any gap between the two multiples comes entirely from how much EBITDA is expected to grow over the coming year.

Step 2: Walk Through a Worked Example

Say a target trades at an Enterprise Value of $2,400m, with LTM EBITDA of $120m and NTM EBITDA of $160m:

  • LTM EV/EBITDA = $2,400m / $120m = 20.0x
  • NTM EV/EBITDA = $2,400m / $160m = 15.0x

Against a peer group trading at a 12.0x LTM median and an 11.5x NTM median, the target's premium falls from about 67% on a trailing basis to about 30% (0.304) on a forward basis. The full step-by-step version of this calculation, including the peer premium math, is worked through in our LTM vs. NTM Multiples case study.

Step 3: Give the Interpretation, Not Just the Numbers

This is the part most candidates skip. The correct interview answer isn't just "the NTM multiple is lower" — it's explaining why: the market is pricing in expected earnings growth, so a name that looks expensive relative to peers on a trailing basis can look much more reasonable once that growth is accounted for. State this explicitly. An interviewer wants to hear that you understand the multiple gap as a proxy for the market's growth expectations, not just as an arithmetic quirk.

Step 4: Anticipate the Follow-Up

A strong candidate volunteers the natural next question before being asked: what if the NTM estimate is wrong? Since NTM EBITDA usually comes from sell-side consensus (sometimes management guidance, which tends to run more optimistic), the multiple is only as reliable as the forecast behind it. Flagging this — and noting that a defensible comps analysis should show both LTM and NTM multiples side by side rather than relying on just one — is what separates a mechanical answer from one that shows real judgment.

What Is NTM EBITDA?

NTM EBITDA is the EBITDA a company is expected to generate over the twelve months starting today — not over the next fiscal year. That distinction is the whole point, and it is where most candidates slip. Unless you happen to be standing exactly at a fiscal year end, the next twelve months straddle two fiscal years, so NTM EBITDA has to be calendarised: stitched together from two consensus estimates in proportion to how much of each year falls inside the window.

NTM EBITDA = FY1 Estimate x (12 - m) / 12 + FY2 Estimate x m / 12

Where: FY1 = the current fiscal year estimate, FY2 = the following fiscal year estimate, and m = the number of months already elapsed in the current fiscal year.

Take the same target from the worked example above. Assume today is 30 June, the fiscal year matches the calendar year, and consensus estimates are $140m for FY1 and $180m for FY2. Six months have elapsed, so half the NTM window sits in each year:

NTM EBITDA = $140m x 6/12 + $180m x 6/12 = $70m + $90m = $160m

That $160m is exactly the NTM EBITDA used earlier. Note what calendarisation does: it prevents you from comparing one company whose year end is in December against another whose year end is in June, which is the single most common source of a broken comps table. Peers with different fiscal calendars must all be pulled onto the same twelve-month window before the multiples mean anything — the same discipline that makes or breaks a comparable company analysis.

How to Calculate NTM EV/EBITDA

Once NTM EBITDA is calendarised, the multiple itself is straightforward:

NTM EV/EBITDA = Enterprise Value / NTM EBITDA

Using the same target — Enterprise Value of $2,400m and NTM EBITDA of $160m:

NTM EV/EBITDA = $2,400m / $160m = 15.0x

Against the LTM figure of 20.0x, the forward multiple is five turns lower purely because the denominator grew from $120m to $160m. Nothing about the company's value changed; only the earnings base you measured it against did.

Two details are worth having ready, because interviewers probe both. First, Enterprise Value sits on top, not equity value — EBITDA is a pre-interest, pre-tax figure available to all capital providers, so pairing it with a post-debt numerator would mismatch the two sides. If that logic is shaky, the EV-to-equity bridge is the place to firm it up. Second, the Enterprise Value in the numerator is current — today's market value — while the denominator is forward. That is deliberate, not an inconsistency: you are asking what the market pays today for a claim on next year's earnings.

One caveat that separates a good answer from a mechanical one: NTM multiples are only as reliable as the consensus behind them. A thinly covered small cap with two analysts producing wildly different forecasts gives an NTM multiple with a wide error bar, and management guidance embedded in those estimates may be optimistic. That is why practitioners quote both — LTM for what is verifiable, NTM for what is expected — and why normalising EBITDA matters just as much on the forward figure as on the trailing one.

Where This Fits Into a Broader Comps Analysis

LTM vs. NTM is one input into a much larger comparable company analysis, which also involves peer selection and scrubbing peer financials for one-off items — covered in depth in our Comparable Company Analysis case and our complete guide to relative valuation. If you also want a refresher on interpreting a single multiple in isolation, see our guide on how to answer what an EV/EBITDA multiple actually means in an interview setting.