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Filing Date: the deadline by which your Company Tax Return must be delivered to HMRC; normally 12 months after the end of your accounting period; also known as statutory filing date.

Financial Year for Companies Act Purposes: your company's financial year begins and ends with the dates covered by your company's annual report and accounts as submitted to Companies House; usually, but not always, matches your Corporation Tax accounting period.

Financial Year for Corporation Tax Purposes: the tax year is called the financial year or fiscal year and runs from 1 April to 31 March.

First-Year Allowance: a type of capital allowance: you may be able to claim this allowance in the year in which you incurred the expenditure.

Franked Investment Income (FII): arises where a company receives a distribution and is entitled to a tax credit in respect of that distribution; the amount of the FII is equal to the aggregate of the value or amount of a distribution together with the amount of the tax credit.