Stamp duty is payable on the VAT-exclusive cost of the property. To calculate the VAT-exclusive amount you divide the cost of the property by 1.135.
Example: A property costs €545,000 (VAT-inclusive). Divide this total by 1.135 to get the cost on which stamp duty is payable, in this case €480,176 (VAT-exclusive).
There is a further amount of relief if you are an existing owner-occupier of a property greater than 125sqm. The stamp duty is payable on 1⁄4 of the VAT-exclusive cost price OR the site cost, whichever is the greater.
Using the previous example of a house for €545,000, and a site cost of €232,000, we can see that stamp duty is payable on 1⁄4 of €480,176 = €120,044 OR the site cost (€232,000/1.135, which equals €204,405) whichever is the greatest. In this case the site cost is the greatest, so stamp duty is payable on €204,405, the chargeable consideration. This would attract stamp duty as follows:
€125,000 @ 0% nil € 79,405@ 7% €5,558.35 Total €5,558.35
This relief doesn’t exist for investors.