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Self Assessment Deadlines You Can't Miss in 2025/26

TaxCorn Team30 April 20264 min read

The 2025/26 tax year runs from 6 April 2025 to 5 April 2026. If you're within MTD for Income Tax, you'll have four quarterly update deadlines plus a final declaration.

Key dates: 7 August 2025 (Q1), 7 November 2025 (Q2), 7 February 2026 (Q3), 7 May 2026 (Q4), and 31 January 2027 for your final declaration and any balancing payment.

Set a reminder: TaxCorn will email you 30, 7 and 1 day before each deadline automatically once you're set up.

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