Error Code 6000 in QuickBooks Online (QBO) typically points to a system issue or a data-related problem within your account, Heinrich.
In the meantime, you can delete the cache files of your default browser to remove outdated and damaged data that may cause unnecessary errors. Sometimes, browser cache and cookies can interfere with the functionality of QBO, especially after an update. For detailed information, check out this article: Clear cache and cookies to fix issues when using QuickBooks Online.
If you need to make changes or update your sales tax rate to ensure you collect the correct amount, you can refer to this article: Edit sales tax rate.
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