Corporation Tax, Self-Assessment
Can I submit earlier years’ returns using BTCSoftware?
You can use CT Solution to submit Corporation Tax Returns for accounting periods commencing on or after 01/04/2006.
You can use SA Solution to create Self-Assessment Returns for tax years ended 05/04/2009 onwards.
HMRC only permit SA Returns to be filed online for four previous tax years from the end of the tax year to which the Self-Assessment relates.