Custom Tax Display Settings for Regular Prices by Specific Wholesale Roles

// Display regular price excluding tax for specific user role

add_filter('woocommerce_get_price_html', 'custom_display_regular_price_ex_tax_for_role', 100, 2);

function custom_display_regular_price_ex_tax_for_role($price_html, $product) {

    // Only run on frontend and for logged-in users

    if (is_admin() || !is_user_logged_in()) return $price_html;

    // Get current user and their roles

    $user = wp_get_current_user();

    if (!in_array('vip_wholesale', (array) $user->roles)) return $price_html;

    // For simple products

    if ($product->is_type('simple')) {

        $regular_price = $product->get_regular_price();

        $price_ex_tax = wc_get_price_excluding_tax($product, ['price' => $regular_price]);

        return wc_price($price_ex_tax) . ' <small>(ex GST)</small>';

    }

    return $price_html;

}