Can I decide myself if I want to give permission for data about my coronavirus vaccination to be stored at RIVM?

Yes. You can decide yourself if you want to give permission for RIVM to store data about your coronavirus vaccination. You do this when you fill in the health questionnaire. What if you do not give permission? Then the RIVM will not store your data.

See also:
Registration of personal data and coronavirus vaccination information (Dutch only)
Vaccination registration at the RIVM and your privacy (RIVM)