Companies across the UK are being reminded of important changes to Corporation Tax (CT) filing and payment, which come into effect next month.

From April 2011, all Corporation Tax payments will have to be made electronically, and all company tax returns must be filed online for accounting periods ending after 31 March 2010. The returns will also have to be filed using a specified data format, known as Inline XBRL or iXBRL.

As well as limited companies, the changes will affect other organisations that pay corporation tax, including clubs, societies, associations, co-operatives, charities and other unincorporated bodies.

There are a number of options for electronic payment, including: Direct Debit; debit or credit card via the BillPay service; your own bank or building society’s internet or telephone banking service; a BACS or CHAPS transfer; by Bank Giro or at participating Post Offices.

Companies will be able to file online either through commercially available software or by using HMRC’s own CT filing software, which is aimed at companies with less complex tax affairs.

To sign up for Corporation Tax online filing visit www.hmrc.gov.uk/ct and then click “Register for Corporation Tax Online” where you can register.