Corporation Tax – deadlines for filing and paying

If you don’t file your Company Tax Return by the deadline, you will have to pay penalties.  

If your return is a day late  the penalty is £100, plus a further £100 if the return is more than three months late. If your tax return is six months late, HMRC will write telling you how much Corporation Tax they think you must pay. This is called a ‘tax determination’ and you can’t appeal against it. 

Use our Corporation Tax Calculator to find out how much you will owe for the current tax year.