Woocommerce: Aplicando impuestos / IVA solo en la página de producto de WooCommerce

function edit_price_display($price, $instance) {
    global $product;

    if(is_singular('product')) {
        $price = $product->price;
        $price_incl_tax = $price + round($price * ( 21 / 100 ), 2);
        $price_incl_tax = number_format($price_incl_tax, 2, ",", ".");
        $price = number_format($price, 2, ",", ".");
        $display_price = '<span class="price">';
        $display_price .= '<span class="amount">€ ' . $price_incl_tax .'<small class="woocommerce-price-suffix"> incl BTW</small></span>';
        $display_price .= '<br>';
        $display_price .= '<span class="amount">€ ' . $price .'<small class="woocommerce-price-suffix"> excl BTW</small></span>';
        $display_price .= '</span>';
        echo $display_price;
    } else {
        echo $price;	
    }
}
add_filter('woocommerce_get_price_html', 'edit_price_display', 10, 2);

Visto en tomjesch