Once the sale has gone through, the deeds of your new property, which now reflect the new ownership and details of the mortgage, must be registered with either the Registry of Deeds or the Land Registry. Your solicitor will manage this registration process for you.
The deeds must be stamped by the Revenue Commissioners before they can be registered; this tax is called stamp duty, and is calculated as a percentage of the purchase price. Some buyers are exempt from stamp duty on transactions up to a certain value - see stamp duty rates.
Your solicitor will then send the deeds of the property to the mortgage provider, as security against the loan until it is paid.
Other legal and registration costs will also apply to close the sale, and your solicitor will generally calculate all costs and request this money from you at the drawdown stage.