How to show prices with VAT ?

Whatever I do, prices in product list or product details always show without VAT, but I need them to include VAT. How can I do that?

Ok, found the problem. The prices where about 20% lower than the prices I had entered, not because of VAT, but because of currencly ratio. For some reason EUR (which is my default currency) had a ratio of 1.2, I changed it to 1.0 and now all is OK.