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Top Tips for Completing and Filing Your Self-Assessment Tax Return

With the self-assessment deadline just two weeks away, time is quickly running out.

While many may find these tips arriving a bit late, proper preparation and planning now can help ensure you're well-positioned for success in the next tax year.

Filing your self-assessment tax return can feel like a daunting task, but with a bit of preparation and organisation, the process can be much smoother. Here are some practical tips to help you complete and file your tax return efficiently and accurately.

Top Tips for Completing and Filing Your Self-Assessment Tax Return

1. Understand Your Deadlines

Make sure you know the key dates for filing your self-assessment:

  • Paper returns: 31 October.
  • Online returns: 31 January.
  • Payment deadline: 31 January.

Filing late can result in penalties, so mark these dates in your calendar and set reminders well in advance.

2. Register Early

If it’s your first time filing a self-assessment, you need to register with HMRC. This process can take time, as you’ll need to receive your Unique Taxpayer Reference (UTR) and activation code by post. Aim to register several weeks before the deadline to avoid unnecessary stress.

3. Gather All Necessary Documents

To complete your tax return accurately, have the following documents ready:

  • P60 and P45 forms (if applicable).
  • Bank statements and interest certificates.
  • Dividend statements.
  • Records of self-employed income and expenses.
  • Pension contributions and charitable donations.
  • Details of rental income or other investments.

Organising these documents in advance will save time and ensure you don’t miss any key information.

4. Claim All Eligible Expenses

If you’re self-employed, you can deduct business-related expenses to reduce your tax bill. Examples include:

  • Office supplies.
  • Travel expenses.
  • Professional subscriptions.
  • Utilities for your home office (a proportionate amount).

Keep detailed records and receipts to back up your claims in case of an audit.

5. Use HMRC’s Online Services

Filing your tax return online is faster, more secure, and comes with built-in checks to help prevent errors. HMRC’s online platform also calculates your tax liability as you go, so you’ll know how much you owe before submitting.

6. Double-Check for Accuracy

Mistakes on your tax return can lead to delays, penalties, or even investigations. Common errors include:

  • Entering incorrect figures.
  • Failing to report all sources of income.
  • Miscalculating allowable expenses.

Review your return carefully before submitting it and ensure all information matches your records.

7. Set Money Aside for Your Tax Bill

If you’re self-employed or earn additional income, set aside a portion of your earnings throughout the year to cover your tax bill. A good rule of thumb is to save 20-30% of your income, depending on your tax bracket.

8. Consider Payments on Account

If your last tax bill was over £1,000, you may need to make payments on account. These are advance payments towards your next year’s tax bill, split into two installments (January and July). Factor these into your budgeting.

9. Seek Professional Advice if Needed

If your financial situation is complex, or if you’re unsure about certain aspects of your tax return, consider hiring an accountant or tax advisor. Their expertise can save you time, reduce stress, and help you maximise deductions.

10. Don’t Leave It Until the Last Minute

Filing your return early gives you more time to resolve potential issues, ask for help if needed, and spread out your payments. Procrastination often leads to errors and missed opportunities for tax relief.

By following these tips, you can simplify the process of completing and filing your self-assessment tax return, avoid penalties, and potentially save money. Remember, organisation and preparation are key to a stress-free experience. If you would like with your self-assessment tax return, or have any questions about your business finances, we are here to help. Just contact the team at PG Owen on

Bath 01225 422183
Midsomer Norton 01761 410444
Warminster 01985 213130