With effect for interest periods commencing on 6 February 1997, the rates of interest for the purposes of overpaid corporation tax are different from those for other taxes. The rate of interest on overpaid corporation tax will depend on the accounting period for which the tax is due and, under self-assessment, the nature of the tax repayable:
For accounting periods within the self-assessment regime (CTSA), i.e. APs on or after 1 July 1999, the rates of interest on repayments of overpaid corporation tax are distinct from those for pre-CTSA periods, because the interest is taxable (see below).
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