How do I register for Corporation Tax?

The owners of a business may decide to form a company at any time. Once you’ve registered your company with Companies House you will need to register it for Corporation Tax. A company needs to register within three months of any business activities starting. You may get a penalty if you register late.

When the decision has been made to become a company, the first step is to register with Companies House.

In order to register, either:

• Complete form IN01 and post to Companies House, or,
• Complete an online registration.

Once Companies House has approved the company, a certificate of incorporation will be issued. This will show the date of incorporation and the company registration number (which is unique).

Companies House will inform Her Majesty’s Revenue and Customs (HMRC) of the formation of a new company.

HMRC will send a letter to all newly formed companies. The letter will include the company’s 10-digit Unique Taxpayer Reference (UTR).

The company must register for corporation tax (the tax paid by companies) online within three months of any business activities starting.

A limited company must keep details of:

1. Annual accounts, including profit and loss (income statement)
2. Bank statements, paying in slips, cheque books and details of amounts paid or received electronically
3. Cash books and other account books
4. Purchase and sales invoices
5. Credit or debit notes (issued or received)
6. Order and delivery notes
7. Records of daily takings
8. Payroll records
9. VAT records
10. Any relevant business correspondence.
     

Any corporation tax due must be paid electronically by nine months and a day after the accounting period end.

For example – a company with a year-end 31 December 2023 must pay any corporation tax due by 1 October 2024.