How to get ready for your self-assessment tax return

◴ 5 min

Preparing your Self Assessment tax return can feel like a daunting task, especially if you’re filing it yourself for the first time. However, with a little preparation throughout the year, completing your return becomes much more straightforward and far less stressful.

For most taxpayers who file online, the deadline for submitting a Self Assessment tax return and paying any tax due is 31 January following the end of the tax year. Leaving everything until the last minute can lead to unnecessary pressure, missed information, and potentially costly penalties from HMRC.

Whether you’re self-employed, a company director, a landlord, or receive income that requires a Self Assessment tax return, preparing early gives you more time to gather information, identify allowable expenses, and ensure everything is accurate.

Here are some practical steps to help you get ready for your Self Assessment tax return.

Register your business with HMRC

If this is your first time completing a Self Assessment tax return, one of the first things you’ll need to do is register with HMRC. This lets HMRC know that you need to submit a tax return and pay tax on your income where applicable.

Once your registration has been processed, you’ll receive a Unique Taxpayer Reference (UTR). This unique number identifies you for tax purposes and will be required whenever you communicate with HMRC about your Self Assessment.

If you’re filing online, HMRC will also provide instructions for setting up your online account, including an activation code. Since these details are often sent by post, it’s important not to leave registration until just before the deadline, as processing can take several weeks.

Registering early gives you plenty of time to access your online account and resolve any issues before your return is due.

Work out all the income types you receive

Before you begin completing your tax return, it’s worth making a list of every source of income you’ve received during the tax year.

Many people assume they only need to declare their self-employed income, but your tax return may also need to include other earnings depending on your circumstances. These could include employment income, rental income, dividends from company shares, savings interest, foreign income, pensions, or capital gains.

Identifying all your income sources early helps you understand which sections of the tax return you’ll need to complete. It also reduces the risk of accidentally leaving out income that should be declared, which could lead to HMRC enquiries or penalties.

Taking the time to organise your income before completing the return will make the entire process much smoother.

Find all the relevant paperwork

Once you’ve identified your different sources of income, the next step is gathering all the documents you’ll need to support your tax return.

Depending on your circumstances, this may include:

  • Bank statements
  • Sales invoices
  • Business expense receipts
  • Payroll records
  • Dividend vouchers
  • Interest statements
  • Rental income records
  • Mortgage interest statements for rental properties
  • Pension contribution records
  • Previous tax returns
  • P60s or P45s
  • Investment statements

Having everything organised before you begin completing your return saves a significant amount of time and reduces the chance of overlooking important information.

Keeping digital copies of receipts and financial records throughout the year can also make tax season much less stressful.

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Get your self assessment ready without the stress

Preparing early can help you avoid missing information, last-minute pressure, and costly mistakes. Pearl Accountants can help organise your records, calculate your tax liability, and prepare and submit your Self Assessment accurately.

Make sure your books are in order

If you’re a sole trader or a partner in a partnership, maintaining accurate bookkeeping throughout the year is one of the best ways to simplify your Self Assessment.

Your bookkeeping records should clearly show your income, business expenses, profits, and any other financial transactions relating to your business. These figures form the basis of your tax return, so accuracy is essential.

Poor bookkeeping often results in missing expenses, incorrect income figures, or time-consuming searches for missing documents when the filing deadline approaches.

Regularly updating your accounting records throughout the year makes completing your tax return much easier and provides a clearer picture of how your business is performing.

Get an accountant

While some straightforward tax returns can be completed independently, many business owners find that working with an accountant saves both time and money.

Tax legislation changes regularly, and there are numerous rules surrounding allowable expenses, tax reliefs, allowances, and reporting requirements. A qualified accountant can help ensure your return is completed correctly while identifying legitimate ways to reduce your tax bill.

An accountant can also:

  • Prepare and file your Self Assessment tax return accurately.
  • Ensure important deadlines aren’t missed.
  • Identify allowable business expenses.
  • Advise on tax planning throughout the year.
  • Help you remain compliant with HMRC regulations.
  • Answer any tax-related questions as your business grows.

Perhaps most importantly, working with an accountant allows you to spend less time worrying about tax paperwork and more time focusing on running and growing your business.

Get in touch with Pearl Accountants now for a free initial consultation.

Final thoughts

Preparing your Self Assessment tax return doesn’t have to be stressful. The key is to stay organised, keep accurate records, and start preparing well before the filing deadline.

Registering with HMRC early, understanding your income sources, organising your paperwork, maintaining up-to-date bookkeeping, and seeking professional advice where needed can all make the process much simpler.

Rather than rushing to meet the January deadline, aim to prepare throughout the year. You’ll not only reduce unnecessary stress but also minimise the risk of mistakes and ensure your tax affairs remain fully compliant.

If you’re unsure about any aspect of your Self Assessment tax return, seeking professional advice can provide valuable peace of mind and help ensure everything is completed accurately and on time.

Picture of Jahan Aslam
Jahan Aslam
With 20+ years of experience, supporting businesses at every stage of their journey, they offer practical advice on UK accounting, taxation, company formation, and financial planning, helping entrepreneurs build and grow successful businesses.

Table of Contents

Frequently Asked Questions

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When is the self-assessment tax return deadline in the UK?

If you file your self-assessment tax return online, the deadline is 31 January following the end of the tax year. Missing the deadline may result in penalties and interest from HMRC.

Yes. If you’re filing for the first time, you must register with HMRC to receive your Unique Taxpayer Reference (UTR) and set up your online tax account before submitting your return.

You should gather records of all your income, business accounts, invoices, bank statements, expense receipts, rental income (if applicable), and any other relevant financial documents before completing your return.

Keeping accurate financial records helps you report your income and expenses correctly, calculate your tax liability, claim allowable expenses, and reduce the risk of HMRC penalties.

If your finances are complex or you run a business, using an accountant can help ensure your tax return is accurate, submitted on time, and takes advantage of all eligible tax reliefs and allowable expenses.

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