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Hello there, @imagine-if-photo.
There are two (2) ways to make sales tax adjustments in QuickBooks Online (QBO).
If you're using the old Sales Tax Center, please follow the steps below:
To know more about managing Sales Tax Payment, feel free to check out this article: Manage Sales Tax Payment.
However, if you're using the Automated Sales Tax feature, here are the steps on how to do it:
For more details steps, please check out this article: Automated Sales Tax.
You can always drop a post in Community whenever you have concerns. I'd be glad to help you some more.