Calendarisation
Restating a company’s figures onto a different year end so it can be compared with peers that close their books on another date. Each fiscal year is weighted by the number of months it contributes to the target period, and the weights sum to twelve. Without it, a comps table silently compares a 31 May year against a 31 December one and every multiple in the column is wrong.
Calendarisation · the mechanism
1 min read
Put two companies with different year ends on the same clock, and compute a forward multiple that compares like with like.
Where it comes up. A VP asks for forward multiples on the peer set and adds “make sure they’re calendarised”. It is a first-week task on the desk, and the reason a comps page is trusted or quietly rebuilt by someone else.
Find the overlap
Pick the target year end, usually 31 December because that is what most of the peer set reports. Count how many months of each fiscal year fall inside it.
Weight by months over twelve
Seven months of overlap is 7/12. The two weights always sum to one, which is the only arithmetic check on the exercise: if they do not, you have counted a month twice or dropped one.
Blend the flow lines only
Weight and add any income-statement or cash-flow line. Balance-sheet lines do not calendarise, because they are a position at a date rather than a flow. Take the nearest reported date and say which one.
Know why this is not LTM
Calendarisation aligns several companies onto one clock. LTM moves one company’s window forward to its most recent reported twelve months. Different jobs, and a comps page often needs both. Only LTM is exact: the month weight assumes trading is spread evenly across the year, and for a seasonal business it is not.
Worked through
A 31 May year end put onto calendar 2026. FY to May 2026 EBITDA $240m; FY to May 2027 $300m. Its reporting quarters run Jun–Aug, Sep–Nov, Dec–Feb and Mar–May, and the Dec–Feb quarter carries the trading peak.
- Weights: months of each fiscal year inside calendar 2026
- 5/12 = 41.7% and 7/12 = 58.3%
- Weighted blend
- $240m × 0.417 + $300m × 0.583 = $275m
- Quarter build: Jan–Feb (two thirds of the $105m peak quarter)
- $70m
- Plus Mar–May 26 $50m, Jun–Aug 26 $50m, Sep–Nov 26 $56m
- $156m
- Plus Dec 26 (one third of the $131m peak quarter)
- $43.7m
The weighted blend says $275m. Building it from quarters says $269.7m, because the even-month weight quietly hands calendar 2026 more of the trading peak than it actually contains. On a $2.75bn enterprise value that is 10.0x against 10.2x: about 2%, and it grows with seasonality. Weighting is what you use when quarters are unavailable, not what you use when they are.
Check yourselfA comps page has a trailing column and a forward column. Which one gets LTM and which gets calendarising, and why?
Answer once you have one →
The trailing column takes LTM, because the problem there is staleness: a fiscal-year figure can be sixteen months old and every company has just reported something more recent. The forward column takes calendarising, because the problem there is comparability: broker estimates are published against each company’s own fiscal year, and those year ends do not line up. Using one where the other belongs answers a question nobody asked, and both columns need a subtitle saying which basis they are on.
Why Calendarisation matters in interviews
Calendarisation is the difference between a comps table that means something and one that quietly compares a May year end against a December one. Interviewers rarely ask for the definition; they hand you a peer set with mixed fiscal years and see whether you notice. On the desk it is a first-week task, which is exactly why it is asked. It separates the candidate who has built a comps page from the candidate who has read about one.
How it works in practice
Only flow items calendarise. Revenue, EBITDA, EBIT, net income, capital expenditure and cash flow are earned over a period, so they can be weighted and blended. Balance-sheet lines are a photograph at a date, so net debt, share count and book equity are taken at the reporting date nearest the one you want.
The convention on the sell side is to calendarise to the year end of the majority of the peer set, which is usually December, and to state it in the header of the page. Some houses instead use next-twelve-months figures from the current date, which sidesteps fiscal years entirely but requires consensus estimates by quarter rather than by year. Know which convention the page you are looking at uses, because the two produce different numbers for the same company.
Estimate-based calendarisation carries an extra trap. If a broker publishes FY26 and FY27 EBITDA for a May-year-end company, blending them assumes the seasonal shape of the business is flat across the year. For a business with a heavy Q4 that assumption is wrong, and the better answer, where the data exists, is to build the calendar year from quarterly estimates instead.
What candidates get wrong
- Calendarising the balance sheet. Weighting net debt across two reporting dates produces a number that never existed. Take the closest reported date and say so.
- Weights that do not sum to twelve months. It is the single arithmetic check on the whole exercise and it catches a double-counted month every time.
- Calendarising the numerator as well as the denominator. Enterprise value is a market value today, not a period figure. Only the earnings line moves.
- Blending quarters with very different seasonality using annual figures. A December-quarter-heavy business calendarised from annual numbers will be misstated, and a good interviewer will ask what you assumed.
- Forgetting to say you did it. An uncalendarised page and a calendarised page look identical. The subtitle is not decoration; it is the audit trail.
Calendarisation: frequently asked questions
What is calendarisation in finance?
Calendarisation restates a company’s financial figures onto a different year end so it can be compared with peers reporting on another date. Each fiscal year contributing to the target period is weighted by the number of months it contributes, divided by twelve, and the weighted figures are added. A company with a 31 May year end, put onto a calendar year, takes five twelfths of the fiscal year ending in May and seven twelfths of the next one.
Why do companies have different fiscal year ends?
Usually to close the books after the busiest trading period rather than in the middle of it. Retailers commonly close on or near 31 January, after Christmas and the January sales; companies built around one annual product cycle close after it. Counting stock and closing accounts during peak trading is operationally difficult and produces a year end that splits the most important weeks of the year across two reporting periods.
Do you calendarise the balance sheet?
No. Balance-sheet items are a position at a single date rather than a flow over a period, so blending two dates produces a figure that was never true. Take the reported balance sheet closest to the date you are aligning to, and note which date you used. Only income-statement and cash-flow lines are calendarised.
What is the difference between calendarisation and using NTM figures?
Calendarisation aligns companies to a common fiscal period, usually the calendar year. Next-twelve-months figures instead roll forward twelve months from today for every company, so fiscal years never enter the calculation. NTM is cleaner and is standard on many trading desks, but it needs quarterly estimates; calendarisation works from annual estimates, which are more widely available. The two produce different multiples for the same company, so a page should use one convention throughout and say which.
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