New to Self Assessment? What to Do Before Registering

Registering for Self Assessment for the first time can feel daunting, but a little preparation will make the process much easier. CPM Accountants has put together this practical checklist to help you get started.

1. Check whether you need to register

You may need to complete a Self Assessment tax return if you:

  • are self-employed or a business partner
  • receive rental or other untaxed income
  • have income above certain HMRC thresholds
  • need to report capital gains
  • have more complex tax affairs

Check the latest HMRC guidance before registering, as the rules depend on your circumstances.

2. Identify why you need to file

The registration process varies depending on whether you are self-employed, part of a partnership or registering for another reason, such as rental income. Knowing why you need to file helps ensure you register correctly.

3. Gather your details

Have the following information ready:

  • full legal name and current address
  • date of birth
  • National Insurance number
  • email address and phone number
  • business details, if applicable

Make sure your details match HMRC’s records.

4. Confirm your trading start date

If you are self-employed, you will need to provide the date you started trading. This affects the tax year you report and the records you must keep.

Your start date is generally when you began business activity with the intention of making a profit—not necessarily when you received your first payment.

5. Organise your records

Set up a system for recording:

  • income and sales
  • business expenses
  • invoices and receipts
  • bank statements
  • mileage
  • property income and costs, where relevant

A spreadsheet may be sufficient, although bookkeeping software can make managing your records easier.

6. Consider other obligations

Depending on your circumstances, you may also need to consider:

  • VAT registration
  • PAYE for employees
  • Construction Industry Scheme (CIS) responsibilities
  • Making Tax Digital requirements

7. Budget for tax

Start setting money aside for Income Tax, National Insurance where applicable and possible payments on account. Planning early can help prevent cash-flow problems when your first bill arrives.

8. Understand the deadlines

Make sure you know when you must register, submit your tax return and pay the tax due. Missing HMRC deadlines can result in penalties and interest.

Common mistakes to avoid

First-time taxpayers commonly:

  • register late
  • provide the wrong start date
  • keep incomplete records
  • forget to budget for tax
  • overlook other registration requirements
Need help?

CPM Accountants can help you determine whether you need to register, complete the registration correctly and prepare your bookkeeping and tax returns.

Getting professional advice early can save time, reduce stress and help you avoid costly mistakes. Contact CPM Accountants to discuss your Self Assessment requirements.

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