When doing a trade on the same day you can make it so the store credit comes up as a line item so taxes aren’t applied.
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How Trade Items appear in the Transactions tab
How To Input Same day Trade Line Items How Trade Items appear in the Transactions tab Process Trade Items Trade Items Overview Trade Item Entry Process Using the Wishlist Wishlist Cross-Reference report Looking for Wishlist Matches While Adding Items Wishlist Overview Find an Item from within an Account Finding Items with a Status of Needs Info