This plugin exempts WooCommerce customers from tax by role or by hand, with a full audit trail of every change.

A plugin to add simple tax exemption to the Woocommerce checkout page. Records the Tax Exempt ID to the order meta.

Add a VAT number field to WooCommerce checkout with per-country validation, and mark trusted B2B customers as tax exempt.

Stop charging tax to exempt customers: tax-exempt roles, tax-exempt customer accounts, and an "I am tax exempt" claim with a number at checkout.