What does 'Attn-reg-tax-mismatch' tag mean on my orders?

Topic summary

Orders are appearing with an unusual tag labeled “Attn-reg-tax-mismatch” (attention registration tax mismatch).

Troubleshooting suggestions:

  • Check the order timeline for additional details
  • Review any apps with auto-tagging functionality and their configured rules
  • Examine tax configuration settings, as the tag name suggests a potential issue with tax registration setup

Current status:

  • Multiple users are experiencing this issue, including long-established shops that haven’t encountered it previously
  • The tag appears to be related to Shopify’s tax registration system based on documentation references
  • No definitive cause or resolution has been identified yet
Summarized with AI on November 16. AI used: claude-sonnet-4-5-20250929.

This morning I came in to a strange tag next to some of my orders: “Attn-reg-tax-mismatch”

What does this mean?

2 Likes

Check the order timeline to see if there are any details there.

If not, check to see if you have any apps that auto tag orders, if yes then check the rules set up there or ask the app if they added the tag.

If those don’t turn up any clues, sounds like it’s something triggering with Shopify because of your tax configuration, this document might help (I googled the tag name and this section of Shopify docs has a similar meaning “registration tax”) - https://help.shopify.com/en/manual/taxes/registration

I also got tons of them randomly. Been a shop for years never had this.