Display price with tax

Hello everybody.

I can't find a way to show the price with tax on the checkout page. The cart on the right and on all the products shows the price with tax but not when I come to the checkout.

Please see image.

For that, you can add the line
$this->params->set('price_with_tax',1);
after the first <?php tag of the file "step" of the view "checkout" that you can edit via the menu Display->Views