Free tools
Quick, free tools to help you file your own company tax return.
Corporation Tax deadline calculator
Find your CT600, Corporation Tax payment and Companies House accounts deadlines from your accounting period end date.
Open tool →Micro-entity checker (FRS 105)
Answer three questions about your company size to see whether you can file the simplest micro-entity accounts.
Open tool →Corporation Tax estimator
Estimate your Corporation Tax bill from your taxable profit, including the small profits rate, main rate and marginal relief.
Open tool →