Show Tax Amount in the Product page

Question

I'm trying to show the label "Tax amount: 40$" on my product page, just under the price, as this image

I enabled in the System > Configuration > Sales > Tax almost every display with "show including tax and without tax" and "Show tax in the total" in every tab but I still do not see it, just a double price with tax and without tax. How could do like the image show? Someone could give me some advice?

Thank you very much! Cheers.

Answer 1

This is already answered on stackoverflow: https://stackoverflow.com/a/25403845/1480397 but it looks like horrible code, so I would do it this way:

Get the tax rate then calculate the tax amount with \Mage_Tax_Model_Calculation::calcTaxAmount