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When Is The Self Assessment Deadline

The deadline for filing Self Assessment Tax Returns is 31st January 2024 for the 2022/23 tax year. This deadline applies to online tax returns and also includes the payment of taxes owed. If opting for paper filing, the deadline is 31st October 2023. Missing the registration deadline of 5th October 2023 may result in penalties.

eamon
Eamon Shahir
Founder
Oct 28, 2025
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What is Self Assessment?

The UK self-assessment tax system requires individuals, self-employed workers, and business owners to report their income, capital gains, and other relevant information to Her Majesty's Revenue and Customs (HMRC) each year.

The tax year in the UK runs from April 6th to April 5th of the following year, and individuals are required to file their self-assessment tax returns accordingly. Many people procrastinate on this task until the deadline approaches, causing stress.

Who Should Submit a Self-Asssessment?

A Self Assessment Tax Return must be filed if any of the following criteria apply for the tax year:

Additional criteria apply to untaxed income, and it may be necessary to complete a tax return if you have received any of the following during the 2022/23 tax year:

  • Child benefits if the income was over £50,000
  • Money from savings, investments, and dividends
  • Foreign Income
  • Tips and commission
  • Money from a rental property

Self Assessment Deadline 2022/2023

The deadline for filing Self Assessment Tax Returns is 31st January 2024 for the 2022/23 tax year. This deadline applies to online tax returns and also includes the payment of taxes owed. If opting for paper filing, the deadline is 31st October 2023. Missing the registration deadline of 5th October 2023 may result in penalties.

Let’s recap the Self-Assessment deadlines:

  • 5th Oct 2023 – Self Assessment registration
  • 31st Oct 2023 – Paper tax returns
  • 31st Jan 2024 – Online tax returns
  • 31st Jan 2024 – Payment for outstanding tax

What if the Self-Assessment deadline is missed?

If you fail to meet the deadline for filing a Self Assessment Tax Return, it will lead to a penalty. The penalty for missing the deadline is £100. However, the penalties extend if you continue to prevent submitting your financial information to HMRC.

Some penalties are listed below:

  • Late payment: £100 penalty
  • 30 days late: 5% of the tax due
  • Up to 90 days late: £10 per day penalty
  • Six months late: 5% of the tax due or £300, whichever is greater
  • 12 months late: Additional 5% of tax due or £300, whichever is greater

Wrapping Up

Understanding the deadlines and challenges of filing self-assessment tax returns is crucial for individuals and businesses in the UK. By being aware of the deadlines, organising financial records, and seeking professional assistance when needed, taxpayers can navigate the UK tax system effectively and avoid penalties. Taking proactive steps to meet tax obligations ensures compliance and contributes to a smooth tax filing process each year.

Discover the convenience of Taxd today and effortlessly meet all your tax obligations. Visit our website now to learn more.

eamon
Eamon Shahir
Founder
Eamon has years of experience providing efficient tax planning and support, including 3.5 years at PwC. He now focuses on product, sales and strategy. He is a software engineer and part qualified ACA chartered accountant.

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