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.
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 with the year you want
Pick the target year end, usually 31 December, because that is what most of the peer set reports. Count how many months of the company’s prior fiscal year fall inside it, and how many months of its current fiscal year do.
Weight each fiscal year by its share of twelve
Seven months of overlap is 7/12. The two weights always sum to one, which is the arithmetic check: if they do not, you have counted a month twice or dropped one.
Blend the figures
Multiply each fiscal year’s revenue, EBITDA or EBIT by its weight and add them. Any income-statement or cash-flow line calendarises this way. Balance-sheet lines do not, because they are a snapshot at a date. Take the date closest to the one you want and say so.
Worked through
A company with a 31 May year end, put onto a 31 December calendar year. FY ending May 2026 EBITDA is $240m; FY ending May 2027 EBITDA is $300m.
- Months of FY-May-2026 inside calendar 2026 (Jan–May)
- 5 → weight 5/12 = 41.7%
- Months of FY-May-2027 inside calendar 2026 (Jun–Dec)
- 7 → weight 7/12 = 58.3%
- Weighted contribution from FY-May-2026
- $240m × 0.417 = $100m
- Weighted contribution from FY-May-2027
- $300m × 0.583 = $175m
Calendarised CY2026 EBITDA = $275m. At an enterprise value of $2.75bn, that is 10.0x, not the 11.5x you would print by lazily using the FY-May-2026 figure.
Check yourselfA retailer closes its books on 31 January. What weights calendarise it to a 31 December year end?
Answer once you have one →
One month from the fiscal year ending that January (1/12 = 8.3%), eleven from the one ending the following January (11/12 = 91.7%). A January year end is almost a calendar year already, which is why retailers are often left uncalendarised, and why the analyst who does it anyway is the one who notices when it matters.
Be able to say this back next week
- Said the weights are months of overlap over twelve, and that they must sum to one
- Named which lines calendarise (income statement and cash flow) and which do not (balance sheet)
- Said the page has to state that it is calendarised, because the two versions look identical
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
Fiscal years diverge from calendar years for operational reasons. Retailers close after the Christmas trading period, which is why a 31 January year end is the sector convention. Companies with a single dominant product cycle close after it. Some are historical accidents nobody has changed because a change would break every comparison a company has ever published.
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: net debt, share count and book equity are taken at the reporting date nearest the one you want, and the subtitle of the page says which date that is.
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.
Go deeper
This term comes up constantly in valuation interviews and on the desk.
DCF interview questions guideRelated Valuation terms
Go further than reading
The written material is free. These are the ways to get it applied to your own work.
CV Review by a Human
Written margin-note feedback on structure, impact bullets and ATS-readability. Reviewed by Suro, not an AI score.
$25 48h turnaround
Cover Letter Review by a Human
Line-by-line review of argument, tailoring and tone, with a rewritten opening as a worked example.
$50 48h turnaround
Inner Circle
Membership: premium tools, role intros, the private community and members-only intel.
$79 /month
Browse the full glossary — 187 finance recruiting and technical terms, in plain English.