Once you have registered your company with Companies House, a pack containing three forms will be sent to your registered company office by HMRC:

CT41G New Company Details – see below
CT41G Dormant company insert – see separate blog post
64-8 Authorisingyour agent–see separate blog post

CT41G New Company Details

This form is for the director(s) to provide details of themselves and their proposed company. If your business is already trading, you should send this in within three months. If you aren’t already trading, don’t send this form until you start. If you won’t be trading for a while, send the Dormant Company form.

The following is a guide to filling in the form. These notes are numbered the same as the numbered boxes.

1. This will almost always be the date the business started to trade. So, if you started trading on or before the day you registered as a company, that’s the date that goes in this box, whereas if you are planning to start trading, i.e. working for clients/customers, after the registration date, then keep hold of the form until then and put that date.

2. Only use this box if your company’s full name is different from the one hown on the form. This is usually left blank.

3. If the company has a long name (longer than 56 characters) HMRC will abbreviate the name. If you prefer a different abbreviation, enter it here. This space is usually left blank.

4. If you can’t find your company’s registration number, go to Webcheck ; type in the name of the company; the number is just below the registered office address.

5. Your company’s registered office address if it’s different from the one shown on the form. Usually left blank.

6. Enter the address or main address where you carry out your business. With most but not all businesses, this is different from the registered office address.

7. Fill in your line of business here: web development, copy writing, web designing or whatever.

8. The simple and straightforward date to use is the accounting reference date for your company which can be found on the Companies House website, however another accounting date may well be optimal for you but as this is a little involved you may wish to seek professional guidance.

9. These boxes are relevant where your company has taken over any sort of business, practice or suchlike from someone else. Otherwise leave blank.

10. If your company is registered as an employer and has made payments to its directors and/or employees, enter the date of the first payment. If no payment has so far been made, leave blank.

11. Usually left blank. This is relevant only to a company which is a member of a group of companies.

12. You need to enter the full name and home address of each of the directors of the company. It’s not absolutely required but they would appreciate the National Insurance number and the name of the tax office dealing with the personal tax affairs of each director. The name of the office is on self-assessment correspondence.

13. If there is someone you wish to act as agent on your behalf, such as an accountant or tax adviser, then complete form 64-8 ‘Authorising your agent’, tick box 13 and send both forms together.

14. If you have an agent, this space is for their contact details.

15. When you registered as an employer, HMRC sent you a PAYE reference number. This is the number required here, along with the name of the HMRC Accounts Office dealing with PAYE for your company.

16. Tick any boxes that apply to your company.

17. This will most likely be the same agent as at box 14, if so, re-enter those details.

Boxes 18, 19, 20 and 21 are of interest to few small companies and are generally left blank.

Sign, date and give your status in the company. And you’re done! It’s highly advisable to keep a copy of this document before posting it to HMRC. As this form is the first document with your company Unique Taxpayer Reference number, be sure to keep a note of it handy for future communications.

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