What do I have to prove when I apply for an extension of this permit?

An extended permit is not automatic. Migri looks back at your previous permit period and checks that you genuinely earned at least the minimum required salary and that the work matched the basis of your permit.

You will normally submit updated terms of employment and proof of income (such as payslips or tax records). If you have unemployment gaps or your earnings fell short, that can affect the extension, so keep clear records of your salary and employment throughout the permit.