Thanks for posting in the Community, mike97!
Changing multiple customers' tax rates at once can enhance your workflow efficiency. However, the option to do so is currently unavailable in QuickBooks Online. This means you'll need to update each customer's tax rate manually.
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For more information about sales tax in QuickBooks, check out this resource: Edit sales tax rate.
Additionally, here’s an article on how to use the Sales Tax Liability report in QuickBooks: Check how much sales tax you owe.
If you have any other questions about taxes in QuickBooks, feel free to reach out. I'm here to help you, mike97!