Fiscal Year Calculator
The year a policy draws around any date — which fiscal year holds it, the span, and the days through it, at any start month you name.
Fiscal Year Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Dates 1900 to 2100; start month 1 to 12
- Date-drawn years anchored on the 1st of the start month — mid-month opens (the UK's 6 April) are approximated; 4-4-5 week calendars are named, not modeled
In short: 24 September 2026 with an October start sits in FY2026 — the year that opened 1 October 2025 and ends 30 September 2026: day 359 of 365, 98.4% gone, 6 days left. The label names the ENDING year, which is why a September date can sit near the close of the year that shares its number.
Formula
open = the start month on or before the date; label = the year the fiscal year ENDS
A fiscal year is a 365-or-366-day window that opens on the month a government or board chose and is named for the year it ends. The US federal year opens in October; the UK's in April; Australia's in July; corporations pick their own. Because the label tracks the closing year, a date early in its fiscal year sits in a label one ahead of its calendar year — 1 October 2026 opens FY2027. The progress card prices how deep into the drawn year the date sits.
Worked Example
- Enter the date.
- Enter the fiscal start month.
- Read the fiscal year, its span and the days through it.
Defaults: 24 September 2026 at an October start — FY2026, day 359 of 365, 98.4% gone. A January start makes the fiscal year the calendar year itself.
Strengths & Limits Of This Model
Where this engine is strong
- Any start month, entered freely
- The ending-year label rule stated
- The January mirror shows the label move
Where it stops
- No 4-4-5 or 52/53-week retail calendars
Practical Use Cases
US federal work
the October-September year
UK and AU reporting
April and July opens
Board calendars
any corporate start month
Methodology & Editorial Standards
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Fiscal Year Calculator — 8 Expert FAQs
8 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
Why does FY2026 start in 2025?
Because the label names the ending year: the US federal FY2026 opens 1 October 2025 and closes 30 September 2026. The convention reads the label as 'the year this fiscal year ends in', which is how the US federal government, the UK and Australia all print it.
Which start months are common?
October for the US federal government, April for the UK, July for Australia, January for anyone whose fiscal year is the calendar year — and every other month for boards that chose differently. The arithmetic is identical; only the anchor moves.
Does the label ever match the calendar year?
Yes — whenever the date sits in the closing stretch of its fiscal year, the labels agree. Late September 2026 at an October start sits in FY2026; the same date at an April start sits in FY2027, because that year has further to run.
What about 53-week fiscal years?
Some retail and 4-4-5 calendars run on weeks instead of dates and stretch to 53 weeks now and then. This page counts date-drawn years; week-drawn years are the ISO week page's territory.
Is FY2026 the same year everywhere?
No — the label alone underdetermines the dates. FY2026 opens in October 2025 for the US federal government, in April 2025 for the UK, in July 2025 for Australia, and on any other month a board chose. This page anchors the label to YOUR start month and says so beside the answer.
What about mid-month fiscal starts?
They exist — the UK tax year opens on 6 April, not the 1st. This page anchors on the 1st of the start month, which approximates such years within a few days; the span card prints the exact dates it used so the approximation is visible, not smuggled.
Do fiscal years run 365 or 366 days?
Both — the span depends on where February falls inside the drawn year. An October 2025 opening runs 365 days to September 2026; the same October opening in 2027 runs 366 through the 2028 leap February. The span card prices whichever year the date sits in.
What is the January mirror card for?
It shows the same date under a January start — where the fiscal year IS the calendar year — so the cost of the policy choice is visible. Labels move with the start month, not with the date; the card makes that explicit instead of leaving it implied.