There are a number of reasons why you need to complete a Self-Assessment return. This includes if you are self-employed, a company director, have an annual income over £100,000 and/or have income from savings, investment or property.

Taxpayers that need to complete a Self-Assessment return for the first time should inform HMRC as soon as possible. The latest date that HMRC should be notified is by 5 October following the end of the tax year for which a Self-Assessment return needs to be filed.

HMRC has an online tool www.gov.uk/check-if-you-need-tax-return/ that can help you check if you are required to submit a Self-Assessment return.

The list of taxpayers that are usually required to submit a Self-Assessment return includes:

  • The self-employed (earning more than £1,000)
  • Taxpayers who had £2,500 or more in untaxed income
  • Those with savings or investment income of £10,000 or more before tax
  • Taxpayers who made profits from selling things like shares, a second home or other chargeable assets and need to pay Capital Gains Tax
  • Company directors – unless it was for a non-profit organisation (such as a charity) and you didn’t get any pay or benefits, like a company car
  • Taxpayers whose income (or that of their partner’s) was over £50,000 and one of you claimed Child Benefit
  • Taxpayers who had income from abroad that they needed to pay tax on Taxpayers who lived abroad and had a UK income, or Income over £100,000
Source:HM Revenue & Customs| 20-03-2023

If you’re unsure about your Self‑Assessment obligations or need help registering and filing correctly, the team at CIGMA Accounting is here to support you. We work closely with construction companieshealthcare professionalsrecruitment companies, and retailers, helping them stay compliant with HMRC rules and avoid unnecessary penalties.

Our accountants support clients across multiple London locations, including Kingston Upon ThamesFulham Broadway, and Hammersmith, as well as nearby areas such as SurbitonParsons Green, and Brook Green. Wherever you’re based, we provide clear, practical tax advice tailored to your situation.

Contact our team today for personalised Self‑Assessment support from trusted local accountants.

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CIGMA Accounting
CIGMA Accounting Ltd is a forward-thinking accounting and tax firm based in London, dedicated to delivering high-quality compliance, tax planning, and business advisory services to entrepreneurs, landlords, and growing SMEs. With offices in Wimbledon and Farringdon, we combine local expertise with a tech-driven approach to simplify accounting. Our services include corporation tax filing, VAT compliance, HMRC investigation support, R&D tax credit claims, capital allowances optimisation, and bookkeeping automation. What sets CIGMA apart is our ability to blend traditional accounting rigour with AI-powered systems that reduce errors, save time, and provide real-time financial insights. Our team ensures that every client - from startups to high-net-worth individuals - receives a bespoke solution aligned with their growth goals. Whether you need strategic tax planning, help with HMRC disclosures, or a full outsourced finance function, CIGMA Accounting delivers clarity, compliance, and confidence.