HM Revenue & Customs

Self Employed short 06 - Accounting date changed

There is a change of accounting date if:

You will usually want your new accounting date to count for tax otherwise your basis period will not end on the same date as your accounts. If you intend this to be only a temporary change, you may wish to ignore it for tax purposes. You can then work out your tax using the same basis period as last year.

Select this box if you've changed your accounting date.