Hello jmkentel,
Thanks for reaching out to us here. Having the option to set up email reminders for your sales tax, is a great feature to ensure you're always on top of your tax obligations. I would be happy to provide some insight here!
This feature is being rolled out to QuickBooks Online Easy Start, QuickBooks Online Essentials and QuickBooks Online Plus customers. However, while this is being added to QuickBooks subscriptions gradually, you may not see the option immediately. Keep checking back, as your account will be automatically updated in the near future.
Let us know if you have any other questions. we would be glad to help!