The ( Balance Tax Account) selected here is for the trial balance and balance of the accounting. As you can see by the note that is directly beside it, you must select the Accounts Payable or create a separate liability or credit card tax account for the credit card.
The tax account for the vendor contact that will be associated with the 5100 Project Materials, and show up when you create a bill is the one above this called ( Default Tax Account for Bills)
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