Euro notes and coins come in on January 1st, but there will be a dual circulation period until February 9th when both euros and the existing Irish notes and coins will be legal tender.
Customers are advised to pay bills in shops and other outlets in one currency only, in order to avoid delays.
All change will be given in euros from January 1st.
Wages, social welfare payments, and withdrawals from banks, building societies and ATMs will be euros from January 1st.
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Euro Changeover Board expects the bulk of cash transactions to be in euros by January 14th.