Include Tax Display for Gravity Forms when WooCommerce is set to enter prices exclusive of tax, but show inclusive.

gravityforms-woocommerce-tax-display.php

add_filter( 'woocommerce_add_cart_item_data', 'remove_adjust_for_tax_display', 10, 1 );
add_filter( 'woocommerce_get_cart_item_from_session', 'remove_adjust_for_tax_display', 10, 1 );
add_filter( 'woocommerce_get_item_data', 'remove_adjust_for_tax_display', 10, 1 );
add_filter( 'woocommerce_add_cart_item', 'remove_adjust_for_tax_display', 10, 1 );

add_action( 'woocommerce_checkout_create_order_line_item', 'remove_adjust_for_tax_display', 10, 1 );
add_filter( 'woocommerce_add_to_cart_validation', 'remove_adjust_for_tax_display', 99, 1 );

function remove_adjust_for_tax_display( $arg ) {
     if ( isset( $_POST['gform_old_submit'] ) ) {
	remove_filter( 'gform_pre_render', 'adjust_for_tax_display' );
      }

	return $arg;
}

add_filter( 'gform_pre_render', 'adjust_for_tax_display' );
function adjust_for_tax_display( $form ) {
	if ( ! isset( $_POST['gform_old_submit'] ) ) {
		$woocommerce_product = wc_get_product();
		if ( empty( $woocommerce_product ) ) {
			return $form;
		}

		foreach ( $form['fields'] as &$field ) {
			switch ( $field->type ) {
				case "product" :
					if ( $field->inputType == 'hiddenproduct' ) {
						$price            = GFCommon::to_number( $field->basePrice );
						$display_price    = wc_gforms_product_addons_format_price( wc_gforms_product_addons_get_price_to_display( $woocommerce_product, $price ) );
						$field->basePrice = $display_price;
					} elseif ( $field->inputType == 'select' || $field->inputType == 'radio' ) {

						foreach ( $field->choices as $index => $choice ) {
							$price                             = GFCommon::to_number( $field->choices[ $index ]['price'] );
							$display_price                     = wc_gforms_product_addons_get_price_to_display( $woocommerce_product, $price );
							$field->choices[ $index ]['price'] = $display_price;
						}
					}

					break;
				case 'option':

					foreach ( $field->choices as $index => $choice ) {
						$price                             = GFCommon::to_number( $field->choices[ $index ]['price'] );
						$display_price                     = wc_gforms_product_addons_get_price_to_display( $woocommerce_product, $price );
						$field->choices[ $index ]['price'] = $display_price;
					}

					break;
				default :
					break;
			}
		}
	}

	return $form;

}

add_filter( 'woocommerce_gforms_get_cart_item_total', function ( $total, $cart_item ) {
	return wc_gforms_remove_tax($total, $cart_item);
}, 10, 2 );

function wc_gforms_product_addons_get_price_to_display( $woocommerce_product, $price ) {
	return 'incl' === get_option( 'woocommerce_tax_display_shop' ) ?
		wc_get_price_including_tax(
			$woocommerce_product, array(
				'qty'   => 1,
				'price' => $price,
			)
		) :
		wc_get_price_excluding_tax(
			$woocommerce_product, array(
				'qty'   => 1,
				'price' => $price,
			)
		);

}

function wc_gforms_product_addons_format_price( $price ) {

	$args = array(
		'ex_tax_label'       => false,
		'currency'           => '',
		'decimal_separator'  => wc_get_price_decimal_separator(),
		'thousand_separator' => wc_get_price_thousand_separator(),
		'decimals'           => wc_get_price_decimals(),
		'price_format'       => get_woocommerce_price_format(),
	);

	$negative        = $price < 0;
	$price           = apply_filters( 'raw_woocommerce_price', floatval( $negative ? $price * - 1 : $price ) );
	$price           = apply_filters( 'formatted_woocommerce_price', number_format( $price, $args['decimals'], $args['decimal_separator'], $args['thousand_separator'] ), $price, $args['decimals'], $args['decimal_separator'], $args['thousand_separator'] );
	$formatted_price = ( $negative ? '-' : '' ) . sprintf( $args['price_format'], get_woocommerce_currency_symbol( $args['currency'] ), $price );
	$formatted_price = html_entity_decode( $formatted_price );

	return $formatted_price;
}

function wc_gforms_remove_tax( $price, $cart_item ) {
	$product = $cart_item['data'];
	$args = array(
		'qty'   => 1,
		'price' => $price,
	);


	$price = '' !== $args['price'] ? max( 0.0, (float) $args['price'] ) : $product->get_price();
	$qty   = '' !== $args['qty'] ? max( 0.0, (float) $args['qty'] ) : 1;

	if ( '' === $price ) {
		return '';
	} elseif ( empty( $qty ) ) {
		return 0.0;
	}

	$line_price = $price * $qty;

	if ( $product->is_taxable() ){
		$tax_rates      = WC_Tax::get_rates( $product->get_tax_class() );
		$base_tax_rates = WC_Tax::get_base_tax_rates( $product->get_tax_class( 'unfiltered' ) );
		$remove_taxes   = apply_filters( 'woocommerce_adjust_non_base_location_prices', true ) ? WC_Tax::calc_tax( $line_price, $base_tax_rates, true ) : WC_Tax::calc_tax( $line_price, $tax_rates, true );
		$return_price   = $line_price - array_sum( $remove_taxes );
	}else {
		$return_price =  $line_price;
	}

	return $return_price;

}