The Stamp 4 immigration permission allows non-EU people to live and work in Ireland without needing a work permit. Those who hold a Critical Skills Employment Permit can apply for this after 21 months on the job, while General Employment Permit holders can apply after five years. Once approved, Stamp 4 gives full work rights and can be renewed. It is also needed when applying for long-term residency or Irish citizenship. Applications are submitted through the Irish Immigration Service and local registration offices.