Can I connect more than one Magento store to TaxJar?

Yes, you can.

Multiple Magento 2 Stores

When connecting to TaxJar from your Magento 2 admin panel, log into your same TaxJar account and connect.

Both Magento 2 and Magento 1 Stores

If you're already using Magento 2, and you want to add a Magento 1 store, visit the Linked Accounts page and click the Magento icon, then follow the steps you see on the next screen to connect another store.

If you're already using Magento 1, and you want to add a Magento 2 store, when connecting to TaxJar from your Magento 2 admin panel, log into your same TaxJar account and connect. An important note is that Magento 2 does not show up in your TaxJar Linked Accounts page the same as your Magento 1 does. You will not see Magento 2 show up in your Linked Accounts page even though you may be successfully linked. 

Multiple Magento 1 Stores

If you're using Magento 1, this can be done with bit of configuration:

• To get started, you'll need need to change your API user in your second Magento 1 site to something like 'TaxJar1.'
• Once you've done this, please email support@taxjar.com to let us know which site has a user of that name so we can update it on our end and help you get the second website connected.