When making your appointment to register for your BSN you will be told the exact documents you need to provide for you and your loved ones that are moving to the Netherlands with you. The necessary documents usually include:
Your valid passport(s)
Your residence permit(s) (if applicable, either a sticker in your passport, a plastic ID card or a letter from IND).
Your rental contract/proof of accommodation (see BSN and Temporary Accommodation)
Unabridged birth certificate(s) with apostille
If married or divorced: Your marriage certificate with apostille or certificate of divorce
If not married: Letter of no-impediment with apostille
Note that the municipalities (Gemeentes) only accept official documents in Dutch, English, French or German, so you may need to get an official translation for other languages.
It may take time to request these documents and have them apostilled by DIRCO so we suggest you start gathering your documents as soon as possible.
Post-pandemic, the municipalities have been known to be lenient allowing applicants who are still waiting on their apostilled documents to apply for their BSN numbers and present them with their documents once they receive them from DIRCO. You will however need to provide proof that you submitted your documents to DIRCO such as a receipt. If you are in a similar situation it is best to contact the relevant municipality or expat centre to confirm that this is still the case and how much time you have to submit your apostilled documents once they arrive.