If your original Express Entry (EE) profile has expired and you're creating a new one, it's fine to change the NOC (National Occupational Classification) code from your old profile, as long as it's supported by your documentation.
Key points from the group:- Changing the NOC is acceptable if your employer reference letter's described duties genuinely justify the new code — the letter should support the new NOC, not just be reused as-is from before.
- An expired old profile does not carry forward any negative effect on your new profile or future application.
- You are not required to write a Letter of Explanation (LOE) specifically to justify the NOC change, based on the group's experience.
Bottom line: pick the NOC code that best matches your actual job duties as described in your reference letter, and don't worry about needing to explain the change from an old, expired profile.