How and when do I have to pay my Corporation Tax bill?
Corporation tax is due 9 months and 1 day after the end of your accounting period, which is usually your financial year but it may differ if you have changed your accounting period during the year or you are in the first year of trading. You can check your accounting period on your Notice to Deliver a Tax Return.
How to pay your Corporation Tax can be found here https://www.gov.uk/pay-corporation-tax