
Paper F6 (UK): Taxation FA2009
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The rules on a change of accounting date
The need for special change of accounting date rules
The conditions for a valid change of accounting date
Calculating the change of accounting date assessments
5 The rules on a change of accounting date
5.1 The need for special change of accounting date rules
Apart from in the first and last tax years, the basis of assessment rules seek to assess
12 months’ worth of profits every tax year.
However, when an unincorporated business decides to change its accounting date,
it will need to produce a set of accounts that is either more than or less than 12
months in length.
The normal current year basis of assessment cannot be used, as the accounts ending
in the tax year will not be exactly 12 months. Therefore special rules are required to
deal with a change in accounting date.
Certain conditions must be satisfied for a business to be allowed to treat a change of
accounting date as valid for tax purposes. These conditions exist primarily to
prevent businesses changing their accounting date frequently in an attempt to gain
a tax advantage.
5.2 The conditions for a valid change of accounting date
For a change of accounting date to be valid for tax purposes, the following
conditions must be satisfied:
The first accounting period to the new accounting end date must not exceed 18
months in length.
The business must not have changed its accounting date in the previous five
years or, if it has, it must have justifiable commercial reasons for making a
further change in the five year period.
HMRC must be notified of the change by 31 January following the tax year in
which the first accounting period to the new date ends.
If the conditions are not satisfied, HMRC will ignore the new accounting date for
taxation purposes and continue to assess profits based on the old date. If necessary,
profit figures will be apportioned accordingly.
5.3 Calculating the change of accounting date assessments
The change of accounting date rules and approach are summarised below.