Hello @dermostica,

Thank you for reaching out here, we want to welcome you to the Docusign Community, I appreciate you bringing your question to this Community.

I apologize for any inconvenience this might cause you, we are committed to providing you with the best service possible. Thank you for bringing this matter to our attention, I understand you want to know how can you add tax ID to your previous invoice.

Per the community guidelines (https://community.docusign.com/site/terms) the Account Admin will need to contact Support directly for Billing and Account Change Requests or Feature enablement.

To open a support case in the Docusign Support Center, go to the "Get Support" section and select "Open a Support Case". Log in using your Docusign credentials and select a case subject. If you have multiple Docusign accounts, choose the appropriate account to continue. Open a case in the Docusign Support Center

If you’re not able to open a Customer Support case via the above link, you can find below the available phone numbers to contact Customer Support:

• Please see the following announcement regarding important changes to
  Docusign Live Inbound Phone Support:
  https://support.docusign.com/s/articles/Upcoming-Changes-to-Live-Inbound-
  Phone-Support?language=en_US”

Note: Some advanced features and options are supported only in specific Docusign plans. Your account plan might not support some options discussed in this help topic. Contact your account administrator for more information about which options are available for your account. Or, visit our Plans and Pricing web page for more details on the features included with your plan. Compare eSignature plans & pricing.

Let us know if you need further assistance.

Best regards,

Christopher | Docusign Community Moderator

"Select as Best" below if you find the answer a valid solution to your issue.

Hi @dermostica,

I hope you are doing well.

I would like to confirm if you were able to solve your issue by utilizing the solution that was suggested or if the information that was provided was useful. If so, please mark it as the best answer by clicking “Select as Best” to make it easier for other users to find. Otherwise, feel free to let me know and I will gladly help you address the situation as soon as possible.

Best regards,

Christopher | Docusign Community Moderator

"Select as Best" below if you find the answer a valid solution to your issue.