HMRC – How to make a dormant company active

HMRC guidance states that this can be done via online service but I could not find an option to do it.

Finally on calling them they informed that I need to send a letter to:

Corporation Tax Services,
HMRC
BX9 1AX

Sample letter below:

Corporation Tax Services,
HMRC
BX9 1AX

10^th Jan 2017

Dear Sirs,
Sub: Company now Active

Unique Taxpayer Reference (UTR): 6666 6666 66
Company Name: THE ABC LTD
Company Number: 09000000

Please make the above mentioned company ACTIVE in your records. The company started trading from 5^th Oct 2015.

Please can we request you to make the following accounting period live to enable us to file the tax return:

Period: 1^st Oct 2015 to 30^th September 2016.

In case you have any questions, please do not hesitate to contact us. We are their HMRC Agent. Our Corporation Tax Agent Reference is: H2102A

Yours faithfully,