Accounting periods for Corporation Tax

Your ‘accounting period’ for Corporation Tax is the time covered by your Company Tax Return.

It can’t be longer than 12 months and is normally the same as the financial year covered by your company or association’s annual accounts. It may be different in the year you set up your company.

Your accounting period affects your deadlines for paying Corporation Tax and sending (‘filing’) a Company Tax Return.

Check your accounting period

Your first accounting period

You’ll get a letter from HMRC giving you dates for your accounting period after you register your company for Corporation Tax.

Tell HMRC if you think the dates are wrong.

If your accounting period and financial year are different

Check what to do if your accounting period is different from your financial year:

Your accounting period can also be different to your financial year when your accounts cover:

more than 12 months, eg after you lengthen your company year
less than 12 months, eg after you close your company or shorten its year

If your accounts cover more than 12 months

You must file 2 returns because your accounting period can’t be longer than 12 months.

If your accounts cover less than 12 months

Your accounting period normally ends on the same day, so will also be shorter than 12 months.

Log in to HMRC’s online service and follow the instructions to enter new dates for your accounting period before you prepare your Company Tax Return.

If you use accounting software to file your Company Tax Return, enter the new dates for your accounting period before you file your return.

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