Hi mrco191,
I see you're encountering some issues with tax codes while creating a new category for accounts. Don't worry, I'm here to assist. If you're looking to alter tax codes, you'll need to navigate to Business settings >> GST settings, and select 'this business is registered for GST'. This will let you modify the tax codes for the categories you've created. For more details, you might want to check out this Help article: Tax code.
Feel free to post anytime you need further assistance.
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Cheers,
Princess