[Updated November 2025]: If you're self-employed in the UK and earn more than £1,000 after allowable deductions, you need to file a self-assessment tax return each year. It's not only the self-employed, though. If you are on a higher income* or receive untaxed income from things like property rental, tips, commission, savings, investments, dividends, or foreign income, you also have to submit a return. Partners in business partnerships and those who made a capital gain resulting in Capital Gains Tax (CGT) also need to submit a return.

If you do have to fill in a self-assessment tax return, getting all the tax return fields filled in properly and the figures right can sometimes be difficult. That's where professional help from companies like Taxfile is worth its weight in gold. But what information will your accountant or tax advisor need from you? In today's guide, we'll explain exactly what you'll need to supply.

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While the transition to the new basis period has introduced certain complexities, it also presents opportunities for businesses to manage their tax liabilities more effectively. One such opportunity lies in the spreading of tax arising from transitional profits.

Transitional profits refer to the profits that arise from the transition between the old and new basis periods. These profits can be spread over

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Are you a sole trader or in a partnership? 

Do you have different accounting dates from the standard 6th of April to the 5th of Apri?

If you answered YES to both questions, some IMPORTANT changes will apply for the tax year 2023-24.

The concept of the basis period determines the time frame used to calculate taxable profits or losses for self-employed individuals, partnerships, and some trusts.  It marks a departure from the traditional "current year" basis, where business profits were taxed based on the accounting period ending within the tax year. Instead, it introduces a "tax year" basis, aligning taxable profits with the UK's standard tax year, running from 6 April to 5 April.

The post Understanding Basis Period Reform for Self-Assessment Tax in the UK appeared first on Taxfile.