mypmpro-update-level-cost-with-tax.php

<?php
/**
 * This recipe update the level cost text based on the Country and State chosen - 
 * If you have a tax configured for a specific state it will add the tax to the billing amount.
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function mypmpro_tax_update_script(){

	global $pmpro_levels;

	$level = ( isset( $_REQUEST['level'] ) ? $pmpro_levels[$_REQUEST['level']] : '' );

	$tax_state = pmpro_getOption( 'tax_state' );
	$tax_rate = floatval( pmpro_getOption( 'tax_rate' ) );	

	?>
	<script type="text/javascript">
		
		jQuery(document).ready(function(){

			jQuery("body").on("change", "#bstate", function(){

				var state = jQuery(this).val();

				if( state === '<?php echo $tax_state; ?>' ){
					
					var billing_text = '<?php 

					if( !empty( $tax_rate ) ){
						$level->initial_payment = $level->initial_payment + ( $level->initial_payment * $tax_rate );
						$level->billing_amount = $level->billing_amount + ( $level->billing_amount * $tax_rate );
					}	

					echo pmpro_getLevelCost( $level ); ?>';

					jQuery("#pmpro_level_cost").html( billing_text );
					jQuery(".pmpro_submit").prepend( billing_text );

				}

			});
		});

	</script>
	<?php
}
add_action( 'wp_footer', 'mypmpro_tax_update_script' );

function mypmpro_override_tax_text( $translated_text, $text, $domain ){

	if( $text === 'Customers in %1$s will be charged %2$s%% tax.' ){
		
		$translated_text = 'Customers in %1$s are automatically charged a %2$s%% tax.';
	
	}

	return $translated_text;
}
add_filter( 'gettext', 'mypmpro_override_tax_text', 10, 3 );