Tax return ex does not want to provide data

Questioner

In 2020 I lived together with my now ex-girlfriend. There were also children living with me (blended family), which means that I cannot continue with my 2020 tax return without her BSN number (and probably her collective income). However, she does not want to give me this information. I choose not to be a fiscal partner and have indicated that she does not have to sign for the return. What can I do to still file my return?

Lawyer

By law, your cohabitation agreement or end of partnership/marriage there are obligations to arrange these kinds of things and share information. So you have to claim it from her, I can help you with this.