HMRC: Frequently asked questions

Corporation Tax FAQs

What does Corporation Tax Online let me do?
How do I send my Company Tax Return online?
How does the downloadable HM Revenue and Customs (HMRC) online filing software work?
What CT600 supplementary pages are supported by the HM Revenue and Customs (HMRC) online filing software?
My company is a member of a group of companies - can I use the HM Revenue and Customs (HMRC) online filing software?
I don't currently send my Company Tax Return online. What do I need to do to get started?
I have activated the service, but still can't see my company's data. What do I need to do?
How do I know if the commercial software I use is compatible with the Corporation Tax online service?
Can I submit a test submission of my Company Tax Return?
How do I know my Company Tax Return has been received?
Can I amend my Company Tax Return online after I've submitted it?
What type of file format must I use when I submit my accounts and computations online?
Do charities have to submit accounts using iXBRL?
I'm attaching my accounts and computations to my CT600 return form - What do I need to do to make sure the data is in iXBRL format?
Can I submit Company Tax Returns over the internet covering any accounting period?
Can I change the date of an accounting period online?
My accounts are for a period of more than 12 months. How can I submit a Company Tax Return?
I am an agent and don't currently submit my client's Company Tax Returns online. What do I need to do to get started?
As an agent, do I need to obtain a declaration and keep a copy of my client's Company Tax Return before I submit it online?
I'm already registered as an agent and have a client who's a nominated company within a Group Payment Arrangement. How do I view the group liabilities and payments?
My company is within a Group Payment Arrangement. Can I view the group's liabilities and payments?
My company is the nominated company within a Group Payment Arrangement. How do I view the group's liabilities and payments?
My company is the new nominated company within a Group Payment Arrangement and I've registered to view liabilities and payments. How long will I have to wait before I can view the group's summary too?
How many years' liabilities and payments will I be able to view?
My company has been 'struck off'. Am I able to use the Corporation Tax online service?
My company is in administration. Will I be able to use the Corporation Tax online service?
My company is in liquidation. Will I be able to use the Corporation Tax online service?
My company is dormant. Do I have to submit a Company Tax Return online?
Do I have to use the joint filing service to file statutory, abbreviated or dormant accounts to Companies House?
How do I change the Trust Settings in the HM Revenue and Customs (HMRC) CT600 online filing software?