Legal Accountants

Basis Period Reform for Barristers and Partners

Written and reviewed by the Legal Accountants editorial team. Last reviewed 28 July 2026.

Basis period reform changed how self-employed barristers and law-firm partners are taxed on their profits, and because the Bar and many firms traditionally used a 30 April year end, it hit them harder than most. If your income tax bills have jumped and you are not sure why, this is usually the reason.

This is what changed, why it created a one-off transition profit, and how the five-year spread softens the cash-flow hit.

What Changed

From the 2024 to 2025 tax year, self-employed people, including barristers and partners in firms, are taxed on the profits of the tax year itself rather than on the profits of an accounting period ending in the tax year. The old approach let a barrister with a 30 April year end be taxed a long way behind real time. That is gone.

The transition year was 2023 to 2024, when the change was made. Anyone whose accounting date was not already 31 March or 5 April had to bring extra months of profit into charge to catch up to the tax year.

The Transition Profit

Because a 30 April year end sat almost a full year behind the tax year, moving onto the tax-year basis meant recognising up to around eleven extra months of profit in one go. That one-off figure is the transition profit, sometimes called the catch-up charge, and for a busy set of chambers or a profitable partner it can be substantial.

Any overlap relief built up in the early years of practice is set against it, which helps, but for most established barristers and partners the overlap relief is far smaller than the transition profit it is offsetting.

Spreading the Charge

The relief in the design of the reform is that the transition profit can be spread over up to five years, to 2027 to 2028, rather than taxed all at once. That turns a single painful bill into five smaller ones, which is much easier on cash flow.

There is planning in exactly how the spread interacts with your other income and your marginal rate each year, and with whether you have moved onto the cash basis. It is worth having that looked at rather than accepting the default, and it is part of what a barrister return should handle.

Common questions

Why has my tax bill jumped as a barrister or partner?

Almost always basis period reform. Moving onto the tax-year basis from 2024 to 2025, especially from a 30 April year end, brings extra months of profit into charge as a one-off transition profit, which pushes the bill up.

Can I spread the transition profit?

Yes. The transition profit can be spread over up to five years, to 2027 to 2028, rather than taxed all at once, which turns one large bill into five smaller ones. There is planning in how you use the spread.

Does overlap relief help?

It is set against the transition profit, which reduces it, but for most established barristers and partners the overlap relief built up in early years is much smaller than the transition profit it is offsetting.

Do I still need a 30 April year end?

There is far less reason to keep one now that profits are taxed on the tax-year basis. Many barristers and firms are moving their accounting date to align with the tax year, and it is worth reviewing as part of the transition.

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