WooCommerce tax classes or rates not applying: why is the wrong tax rule used?

Tax problems in WooCommerce usually show up as missing tax, incorrect totals, or the wrong tax class being applied. Merchants should identify whether the problem is product setup, location logic, or global tax configuration.

WooCommerce tax depends on customer location, store setup, tax classes, shipping-tax behavior, and rounding rules. One small configuration mismatch can therefore produce totals that look completely wrong even though checkout itself is working.

Use the official tax guide to verify the rule set, then test with the exact customer address and product type that produces the incorrect result. If the configuration matches the documentation but the result still looks wrong, capture screenshots and logs before escalating.

Official URLs to review:

• WooCommerce Tax guide
• WooCommerce troubleshooting guide