You have to hand in your Dutch residence permit upon departure. This will prevent creating problems when you decide to return to the Netherlands in the future. You can hand in your residence permit at any IND desk. Please note not to damage or cut your residence permit!
You have to deregister from your municipality. Some municipalities are limited to reach when you are abroad. Therefore, it would be better to deregister from the municipality while you are still in the Netherlands. Please check the IND website for more information about deregistering.
You also have to cancel your health insurance. Contact your insurance company to cancel your insurance.
If applicable, you might also want to close your account with a Dutch bank upon your departure. This is optional, and there are also possibilities to keep your account while abroad. Contact your bank to request them to close your account or to request information about keeping your account while staying abroad.
When you used an OV-chip card for traveling with public transport in the Netherlands, you can request a credit refund. If you have any credit on your OV-chip card and if you don’t wish to use your OV-chip card in the near future, you can apply here for a credit refund.