In this article, you will learn how to add a tag to an affiliate link to track the traffic source.
You can do this using the TK parameter. Add this parameter to the link immediately after your affiliate ID, as shown below:
1. Create the affiliate link: Add ?sa=AFFILIATEID at the end of the URL, replacing AFFILIATEID with your actual affiliate ID.
View the detailed procedure here.
2. Add &tk= at the end of the affiliate link
3. Add the tag you want
Example: Suppose you want to add the tag youtube to a link promoting the systeme.io homepage.
Let's say your affiliate ID is: sa00041537157dbe466c95a6395de4e031d503bea587
Link: https://systeme.io/
Affiliate link: https://systeme.io/?sa=sa0004537157dbe466c95a6395de4e031d503bea587
Affiliate link to add the tag "youtube": https://systeme.io/?sa=sa0004537157dbe466c95a6395de4e031d503bea587&tk=youtube
The "youtube" tag will be added to all sales made from this link.

Last updated on August 25, 2026