How can I extend my total stay in Ireland to five years for permanent residency if the master's program is only one year with two years post-study work visa?

Your masters year on Stamp 2 will not count toward Irish permanent residency, so you need to build your five years starting from the day you move onto a work permission. The fastest realistic route runs through your Stamp 1G graduate visa into a Critical Skills Employment Permit, which fast tracks you to Stamp 4. Here is how the timeline actually adds up for you.

The Timeline to Five Years of Reckonable Residency

What You Need to Do at Each Stage

• During your masters, target sectors on Ireland's Critical Skills Occupations List, such as ICT, engineering, science, or finance
• Use your full two years on Stamp 1G to secure a job offer in one of those eligible roles
• Once hired on a Critical Skills Employment Permit, you can upgrade to Stamp 4 after just two years on that permit
• If your role instead falls under a General Employment Permit, expect the total timeline to stretch closer to six or seven years, since that route requires five full years on Stamp 1 alone
• Keep every Irish Residence Permit renewed without gaps and retain all payslips and tax statements, since these get scrutinized when you apply

My Advice

Start job hunting for Critical Skills eligible roles in the first few months of your Stamp 1G, not near the end of it, since securing that offer early protects your fastest path to five years. Keep a personal folder with every IRP card, payslip, and tax document from day one, because any gap in that paper trail can cost you months when you apply for Stamp 4.