The tax year a date falls in depends on your country. The UK tax year runs April 6 to April 5. The US tax year runs January 1 to December 31 (for most individuals).
UK Tax Year Dates
The UK tax year runs from April 6 of one year to April 5 of the next:
- 2025-26 tax year: April 6, 2025 to April 5, 2026
- 2024-25 tax year: April 6, 2024 to April 5, 2025
- 2023-24 tax year: April 6, 2023 to April 5, 2024
Use our Tax Year Checker to instantly find which tax year any date falls in.
US Tax Year Dates
For most US individuals and businesses, the tax year is the calendar year:
- 2026 tax year: January 1, 2026 to December 31, 2026
- 2025 tax year: January 1, 2025 to December 31, 2025
Some businesses use fiscal years ending on different dates, but individuals typically use calendar years.
Canada and Australia
Other countries have their own rules:
- Canada: January 1 to December 31 (same as US)
- Australia: July 1 to June 30
Why This Matters
Knowing which tax year a date falls in affects:
- Income reporting: Which year do you report income earned on a specific date?
- Deductions: Which year can you claim an expense?
- Deadlines: When is your tax return due?
- Record keeping: How long must you keep documents?
Common Mistakes
Watch out for these errors:
- UK confusion: Income from March 2025 is in the 2024-25 tax year, not 2025-26
- Year-end timing: A payment dated December 31 vs January 1 falls in different tax years
- International work: You may owe taxes in multiple jurisdictions with different tax years
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