When selling a property, your solicitor will need to get Revenue clearance pertaining to your property's LPT. If the sales price is €400,000 or below, general clearance applies and no further action is required. However, for properties with sales prices above this level, in order for general clearance to apply, two tests must be met.
In order to obtain specific clearance, the relevant form is the Revenue Form 5 which is available here.