Revenue has said it raised over €2m in duties and VAT from parcels coming into Ireland last year.
It is advising people that goods imported from outside the EU are subject to VAT, where the value exceeds €22.
Customs duty may also be payable on goods over €150 in value.
There is relief on gifts valued at less than €45, but these must be sent from one private individual to another.
Revenue Officers in Portlaoise, Athlone and Dublin Mail Centres applied charges to over 88,000 parcels in 2014.