WooCommerce tax settings
Understand a coupon's effect on recorded tax
A WooCommerce discount can change the tax stored on an order, but the discount itself is not a second tax adjustment.
Inspect the source record
Open an order with a coupon and compare product line totals, discount fields, and tax lines after the coupon was applied.
Build a focused report
Report that order in TaxPack and inspect discount_net_informational and discount_tax_informational in the event export.
Read the result
The informational discount fields help explain the source order; the stored tax lines already reflect WooCommerce's discount handling.
A concrete example
An order with a coupon and CAD 8 recorded GST should use the CAD 8 line, not subtract a second estimated coupon tax.
Avoid this mistaken conclusion
Do not apply a coupon percentage again to TaxPack's net tax. That would double-count a checkout adjustment.
Official references
These focused notes were drafted with AI assistance and checked against TaxPack behavior and the linked documentation.
These guides explain reporting workflows. TaxPack does not provide tax advice, calculate tax payable, or file returns.