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Trading losses and basis period reform

30 September 2024 / Emma Rawson
Issue: 4955 / Categories: Comment & Analysis , apportion profits , basis periods , trading losses , Business
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All at a loss

Key points

  • The new tax year basis of assessment took effect on 6 April 2024.
  • The treatment of losses in 2023-24 is straightforward but terminal losses are more complicated.
  • The requirement to apportion profits from two sets of accounts under the tax year basis means care must be taken not to double count losses when calculating the terminal loss.
  • For cessations in 2025-26 and beyond there may also be spread transition profits to take into account.

As of 6 April 2024 trading profits of unincorporated businesses are now assessed on a tax year basis. This ‘basis period reform’ represents a fundamental shake up of the income tax rules and has knock-on effects for many other areas of the tax system. It also has some particularly tricky transitional rules which apply for the tax year 2023-24 and beyond.

My previous articles for Taxation have looked in detail at these...

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