Company tax returns
D1.1308 Company tax returns
The corporation tax self assessment process generally starts when HMRC issue a notice requiring the company to deliver a company tax return, although a voluntary return can also be made (see 'Voluntary company returns' below). The company must then deliver a completed return form together with a copy of its accounts and computations by the filing date, although it can be amended within certain limits.
Notice requiring delivery of a company tax return
HMRC issue a notice (form CT603), between three and seven weeks after the end of the period specified in it, to each company in its COTAX database live range, requiring the company to deliver a company tax return. HMRC does not issue hard copies of the return form (CT600) to any company because of the compulsory online filing regime that applies for all companies (see 'Delivery of the return' at 'Method of filing' below).
The notice must specify the period to which it relates, but1:
(a) if an accounting period ends within, or at the end of, the specified period, the return is to be made for that accounting period; if there is more than one such accounting period, a separate return is to be made for each
(b) if (a) does not apply, but an accounting period begins during the specified period (eg a dormant company acquires a source of income during the period), the return is to be made for such part of the specified period as falls
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