Tourists who come to the Republic of Ireland and want to travel to the North will now have to pay £10 sterling for an Electronic Travel Authorisation or ETA.
The electronic document which is linked to your passport has beeen introduced by the British Home Office this week and gives people permission to travel to the UK.
It's being criticised by tour operators, travel agents and politicians who say it's near impossible to police and will damage all-Ireland tourism.
ETAs are also being criticsied for addding a layer of beuracracuy on the border between Northern Ireland and the Republic as 70 per cent of tourists who travel to the south cross the border at say, Monaghan or Cavan, to continue their travels around the North..
British and Irish national and eligible residents will not require the ETA, which is a tourist permission slip only.
Sinn Féin representatives on both sides of the border have been vocal in their criticism.
Cavan-Monaghan TD Cathy Bennett said it has to go:
