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QuickBooks Online (QBO) calculates sales tax based on the customer's Shipping address. Then, enter the zip code plus 4-digits to ensure complete accuracy.
Let me share this article on how to make sure you're using the correct address for tax collection: Validate an address for taxes.
To know more about the automated sales tax feature in QBO, refer to this link: Set up and use automated sales tax in QuickBooks Online.
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