Custom Tax Structure For Paid Memberships Pro for States/Provinces.

pmpro-tax-filter-states-province.php

<?php
/**
 * Add custom tax to Paid Memberships Pro checkout based on state checkout.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
 function my_pmpro_custom_tax( $tax, $values, $order ) {

	// Get state from checkout.
	$bstate = isset( $_REQUEST['bstate'] ) ? $_REQUEST['bstate'] : '';

	if ( empty( $bstate ) ) {
		return $tax;
	}

	$bstate = strtolower( $bstate ); // Make sure bstate field is lowercase.

	$tax_val = 0.07; // default to 7% tax.

	if ( $bstate == 'bc' ) {
		$tax_val = 0.10; // 10% if bstate is BC.
	}

	if( $bstate == 'aa' ) {
		$tax_val = 0.50; // 50% if bstate is AA.
	}

	$tax = round((float)$values['price'] * $tax_val, 2);	
	return $tax;
}
add_filter( 'pmpro_tax', 'my_pmpro_custom_tax', 10, 3 );