What happens if I don't use my jaarruimte?

It doesn't expire immediately. Unused jaarruimte remains available for 10 years as reserveringsruimte, which you can still use in a later year.

After 10 years it does expire permanently. So always use your oldest reserveringsruimte first. In 2026 you may declare a maximum of €42,753 in reserveringsruimte. Calculate what you have left with the reserveringsruimte calculator.