CTM90180 | Corporation Tax self assessment: Glossary of Terms

From HM Revenue & Customs · Company Taxation Manual

Accounting date	The date to which a company prepares its accounts.
Accounting period	The period for which CT is assessed under the Taxes Acts, see onwards.
Filing date	The date by which companies must deliver a company tax return to an officer of Revenue & Customs, see .
Flat - rate penalty	A penalty for the late delivery of a return which varies from £100 to £1,000 according to the degree and habit of lateness, see .
Joint amended return	An amended return made under the special joint amended return arrangement for group relief claims, see .
Late payment interest	Interest charged under on payments of CT made after the due and payable date, see .
Period of accounts	The period for which accounts are prepared by the company.
Repayment interest	Interest payable under ICTA88/S826 on repayments of CT or IT, or on payments of tax credit made after the due and payable date, see .
Return period	The period for which a CT return is required under , see .
Served	A Para 3 notice is deemed to be served on a company on the third working day after it has been posted or one working day if posted first class unless the contrary is proved, see .
Specified period	The period which is shown on the notice to deliver a return (form CT603). This will be a period that an officer expects to be a return period, but if the company’s circumstances have changed the return period may be different, see .
Para 3 notice	The notice to deliver a return (form CT603) which must be served on a company in order to impose the obligation to deliver a return. See .
Tax-geared penalty	A penalty for the late delivery of a return, which is calculated by reference to tax unpaid. The penalty is charged at 10% or 20% of the tax unpaid according to the degree of lateness, see .
Tax unpaid	The amount of CT unpaid, usually 18 months after the end of that accounting period, see