A company may be dormant if it's not doing business or trading and doesn't have any other income, such as investments or tangible assets. According to the Companies Act 2006, a company which has no significant accounting transactions (transactions required to be entered in the company's accounting records under section 386 of the Companies Act 2006) (section 1169, Companies Act 2006). For more information, please follow the link.

https://www.legislation.gov.uk/ukpga/2006/46/section/1169

Accounting Section 1169(3), Companies Act 2006, when determining when or whether a company is dormant, the following financial transactions may be disregarded:

- Payment for shares taken by subscribers to the memorandum of association.

- A fee paid to the Registrar of Companies on a change of company name, the re-registration of a company, or filing of a confirmation statement.

- Payment made to the Registrar of Companies as a penalty for failure to deliver accounts.

• Does not have a business bank account.
• Does have a business bank account but no bank charges have been paid during the year.
• No expenses paid for the company other than Companies House fees.
• Accountancy fees paid by the director personally and will not be recorded as the company's accounting transaction.

• Submit the confirmation statement to Companies House on time.
• Submit the company's year-end accounts to Companies House by the deadline.
• Exercise independent judgment to decide if the company is dormant for Companies House and inactive for corporation tax purposes.
• There are other responsibilities that only apply to trading companies, such as acting within powers, promoting the success of the company, exercising reasonable care, skill, and diligence, avoiding conflicts of interest, not accepting benefits from third parties, and declaring interests in proposed or existing transactions or arrangements with the company, etc.

The authentication code for Companies House is a unique code issued to companies registered in the United Kingdom for authentication and online filing purposes. Each company will have its own authentication code, which is typically sent by mail to the registered office address of the company when it is first incorporated. It can also be obtained by filing certain forms or requesting it directly from Companies House. To obtain the authentication code for a specific company, you should refer to the official correspondence or documentation received from Companies House or contact them directly for assistance.