How long is the first Luxembourg salaried worker permit valid, and what about renewals?

Your initial salaried worker permit is issued for a maximum of one year and is tied to one profession and sector. This short first term lets the authorities confirm the employment relationship is genuine.

From the first renewal onward, the permit can be granted for up to three years and is no longer restricted to a single profession or sector, which gives you much more freedom. However, this longer validity depends on proving that you were actually employed during the prior validity period. If there were significant gaps in employment, the renewal may again be limited to just one year.