This can be a tricky issue because the discount needs to be factored into the taxable amount before the VAT is calculated. I’d check whether the discount is being applied before or after tax in the WooCommerce settings, as that can explain why the calculation changes unexpectedly. It’s also worth manually checking a few examples to see whether the VAT is being calculated on the discounted subtotal.
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This reply was modified 1 week, 4 days ago by kickcarl921.
