A sale of a site or land may create a capital gain if the proceeds exceed your acquisition cost and allowable costs, such as certain professional fees and improvement expenses. Capital gains tax can apply to individuals, although reliefs and exemptions may be relevant depending on how you acquired and used the land. The main private residence relief will not usually cover a separate site that has not formed part of your home and garden. You must report the disposal and pay any tax due within the applicable Revenue deadlines, which can vary by disposal date. Check the current rules on revenue.ie or speak to a tax adviser about your circumstances.