Feefo Gold Merchant

IR35 Advice Centre


Confirmation of Arrangements

Confirmation of Arrangements
Contact Qdos Contractor:0116 269 0999

IR35 Resources


Free Confirmation of Arrangements Letter (CoA)

A Confirmation of Arrangements (CoA) is a letter which seeks to obtain a signed agreement as to the true nature of your working relationship with your end client.

When assessing IR35 status, your working practices will always hold the most weight, particularly in an IR35 investigation where the terms of your contract will be scrutinised against the 'hypothetical contract' - i.e. the true nature in which you work.

The Confirmation of Arrangements is most useful when signed by your end client, confirming in writing their testimony that key pointers to self-employment are evident, such as a genuine right of substitution/lack of personal service and control over the provision of the services

Having a CoA letter for each assignment you undertake can significantly improve the prospects of successfully defending an IR35 enquiry, even shutting down an enquiry at the first hurdle.

Using the Confirmation of Arrangements Template

  • This letter is intended to act as a guide, it is not a legally binding document. Please read the document carefully as this must be a true reflection of your actual working practices.
  • Certain sections may need to be deleted if you do not feel that they are applicable to you.  Additionally you may have other more specific information which you would like to add to this document to support your status. 

  • Once you have completed your Confirmation of Arrangements Letter you may forward this to [email protected] before you present it to the end client to sign (there may be an applicable fee for a CoA review).

  • Your letter should ideally be presented on your own business stationery and if possible you should obtain a business card from your contact to attach to the letter. The person who you approach in order to sign your confirmation letter should be someone directly involved with the provision of your company’s services.

  • Please note that some clients may be reluctant to sign a Confirmation of Working Arrangements, particularly if you are providing services for a very large organisation. Where the client is reluctant to do this, it may be worth explaining that this is for information purposes and that it is not a legally binding document.  Additionally your end client would be obliged to provide HMRC with such information in the event of an IR35 enquiry. Beyond this there is little that can be done if the end client refuses to sign it and your reputation with the client should never be jeopardised just for the purposes of putting such a document in place.


The content on our site is provided for general information and use only and it is not intended to amount to advice on which you should rely. You must obtain professional or specialist advice before taking, or refraining from, any action on the basis of the content on our site.

Although we make reasonable efforts to update the information on our site, we make no representations, warranties or guarantees, whether express or implied, that the content on our site is accurate, complete or up to date.

No individual is personally liable in connection with the content on our site. By accessing or using the content or by acting on the basis of the content, you or any third party (as applicable) accepts that no individual is personally liable whether in contract, tort, for breach of statutory duty or otherwise.


Tax & IR35 Cover

From £199.00 Tax Liability Cover (TLC35)

Full IR35 insurance, covering representation costs in dealing with HMRC plus additional tax, NIC, interest and penalties arising from an IR35 enquiry....

From £199.00 Tax Liability Cover (TLC35)
Learn more
Only £99.00 Tax Enquiry Insurance

Covers full representation costs in the event of a range of HMRC enquiries, including PAYE reviews, IR35, Section 660a. You can add Unlimited IR35 Co...

Only £99.00 Tax Enquiry Insurance
Learn more

Need Help?


Call our team on 0116 269 0999
Or arrange a call back

Call back
Chat with us