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How to Prepare for Self-Assessment Tax in the UK

The UK Self-Assessment tax return deadline (31 January) catches many by surprise. Here’s how to prepare.

Step 1: Register for Self-Assessment

  • Register with HMRC by 5 October (if you’re newly self-employed).

Step 2: Gather Your Records

  • Income (invoices, sales records).
  • Expenses (receipts, bank statements).
  • P60 or P11D if you’re also employed.

Step 3: Calculate Taxable Profit

  • Deduct allowable expenses from income.
  • Include other income (rent, dividends, etc.).

Step 4: Submit Your Return Early

  • Avoid last-minute stress (deadline: 31 January).
  • Pay any tax owed by the deadline to avoid penalties.

Pro Tip: Use accounting software or hire an accountant to simplify the process.


Being organised and starting early makes Self-Assessment much easier.