How to add corporation tax on monthly financial forecast

Hi All,

What entries do you put on monthly Income Statement, Balance Sheet and cash flow for the debt and payment of corporation tax (UK)?

I've worked out the formula to calculate Corporation Tax in month 12 of each year and this gives me 'earnings after tax' in the Monthly Income Statement but I don't know what else to add to the financial docs to make everything square up.

I've been reading all day online and understand Corp Tax is a liability but I cannot get beyond "add it as a short term liability to the balance sheet.

My forecast will presume I pay the tax the same day that it becomes due.

Sorry if this isn't the right sub.. please point me in the right direction.

Thanks for any and all help.