Definition
A fiscal year is a 12-month accounting period used by a business or government to calculate annual financial statements, tax returns, and budgets. It may align with the calendar year (1 January to 31 December) or with a country-specific tax year (UK 6 April to 5 April, AU 1 July to 30 June, NZ 1 April to 31 March, CA and SG mostly calendar year for personal tax with companies choosing their own). Corporate fiscal years are set at incorporation in most jurisdictions and can be changed only with regulatory or tax-authority approval.
What a fiscal year means in practice
For a bookkeeper, the fiscal year is the cadence that drives every annual deliverable: the year-end close, the statutory accounts, the tax return, the depreciation calculation, and the budget for the following year. Most operational work (monthly P&L review, VAT returns, BAS lodgement, GST returns) runs on cycles that fit inside the fiscal year, but the year itself defines the boundaries.
The complication is that personal tax years and corporate fiscal years often differ. In the UK, individuals always use 6 April to 5 April; companies set their own corporation tax year at incorporation. The mismatch means a UK owner-managed company’s dividends paid in 2026-27 (the individual’s tax year) might come from corporate profits earned in a year ending 31 March 2027 (the company’s tax year). The two timelines need separate tracking.
A practical example: a UK consultancy incorporated 12 May 2020. Companies House asked for an accounting reference date; the founder chose 31 March (the calendar quarter-end closest to the incorporation anniversary). Since then, every corporate fiscal year runs 1 April to 31 March. Personal tax for the founder runs 6 April to 5 April. The 31 March 2027 corporate year-end produces the statutory accounts and the corporation tax return for the year ended 31 March 2027. The 5 April 2027 personal tax year-end produces the self-assessment for any director-shareholder dividend received during that 6-day overlap period plus the 12 months prior.
How fiscal years work by country
United Kingdom
Tax year for individuals and sole traders ends 5 April (the UK tax year is the year ended on that date; “2026-27” means 6 April 2026 to 5 April 2027). Companies set their own accounting reference date at incorporation. The corporation tax year follows. UK SMBs commonly align the company year with a calendar quarter-end (31 March is most common; 31 December and 30 June are next).
Statutory accounts must be filed at Companies House within 9 months of year-end for private companies (6 months for public). The corporation tax return is due 12 months after year-end; the tax payable is due 9 months and 1 day after year-end.
Australia
Tax year (financial year) ends 30 June. Calendar-year alternates are permitted only with ATO approval, typically granted to foreign-owned subsidiaries aligning with overseas parents. Company tax returns due 15 May of the following year for most lodgers (earlier for businesses with a poor lodgement history). The financial year aligns for individuals and companies (no UK-style mismatch).
Canada
Corporate fiscal year-end is set by the corporation at incorporation. Most SMBs choose 31 December but any month-end is permitted. The T2 corporate tax return is due 6 months after year-end; the balance owing is due 2 months after year-end for most corporations or 3 months for Canadian-controlled private corporations meeting specific tests. Personal tax year always ends 31 December.
New Zealand
Standard balance date is 31 March (the tax year-end for individuals and most companies). Companies can adopt non-standard balance dates with IRD approval; common alternates are 30 June, 30 September, and 31 December. The annual income tax return is due 7 July of the year following balance date, with extensions to 31 March for clients of registered tax agents.
Singapore
Company financial year-end is set at incorporation, typically 31 December for SMBs but any month-end is permitted. Personal tax year always ends 31 December. Estimated Chargeable Income (ECI) is due within 3 months of company year-end. Form C or C-S is due 30 November of the year following the year of assessment.
Related terms
The fiscal year defines the boundaries of annual accounting cycles:
- Year-end close happens at the fiscal year-end and finalises the books.
- The balance sheet is the snapshot at the fiscal year-end.
- The income statement covers the fiscal year.
- Net profit is the bottom line of the fiscal-year income statement.
- The statement of changes in equity shows how equity moved over the fiscal year.
See also
For the year-end close process that finalises the fiscal year, see the year-end close entry.
FAQ
See the answered questions above for the 2026-27 UK tax year, why the UK uses 5 April, and changing fiscal year-ends.