refer link https://code.i-harness.com/en/q/1b8888a Display tax totals as a single total add_filter ( 'woocommerce_countries_tax_or_vat' , function () { return __ ( 'GST' , 'woocommerce' ); }); Another Examples add_filter ( 'woocommerce_countries_inc_tax_or_vat' , function () { return __ ( 'GST' , 'woocommerce' ); }); add_filter ( 'woocommerce_countries_ex_tax_or_vat' , function () { return __ ( 'GST' , 'woocommerce' ); });