What happens at Irish border control
An Irish visa allows you to travel to Ireland and then to request permission to enter the country. It does not allow you into the country automatically or give you permission to stay.
Immigration officer's decision at border control
At border control an immigration officer will examine your passport, visa and any other documents that explain your visit, eg landing card, travel itinerary, reservations.
They will then decide if you are allowed to enter the country.
Note: An Irish visa is a paper document with an adhesive back. The visa document is placed into a blank page of your passport or travel document. See what a visa looks like.
Even if you have a valid visa for Ireland, you could be refused entry by the immigration officer if they are not satisfied by your documents or explanations.
If you are allowed to enter
The officer will place a 'landing stamp' in your passport to give you temporary permission to stay here. This stamp also identifies how long you can stay and the reasons for your stay, eg work, study, visit.
The maximum time you will be given permission to stay by the officer at border control is 3 months. (In some circumstances, you may be given less than 3 months).
If you arrive with a long stay 'D' visa and wish to stay in Ireland longer than 3 months, the immigration officer will add a date to your landing stamp.
You must visit an immigration registration office before this date to apply for permission to stay and to register your details in person.
If you are not allowed to enter
You must leave the country without crossing the border.