After completing a master's degree in medieval studies, she worked as a freelance translator in French, English and Italian, then as a trainee in the economic affairs department in the Dutch city of Gouda.

[9] In 't Veld intended to seek re-election in the June 2024 European Parliament election as the lead candidate of Volt Netherlands, but she had not been a member of the party long enough to be eligible.

[11] She failed to win re-election in June 2024, as Volt Belgium's vote share of 0.9% was insufficient to secure any European Parliament seats.

[14] In 2009, In ‘t Veld and her fellow MEP Sarah Ludford publicly supported an online petition calling for abortion to be made legal across all EU member states.

[15] Following the 2014 elections, In 't Veld joined fellow MEPs Othmar Karas, Sven Giegold, Sylvie Goulard and Alessia Mosca in an open letter aimed at exerting pressure on the President of the European Commission and national government leaders during the nominations process to improve the gender balance in the composition of the European Commission.

[16] In 2008, In 't Veld filed a lawsuit against the United States Department of Homeland Security, demanding to see what information it had collected on her from her PNR data; this move led to her being blacklisted.

The EU’s General Court ruled in December 2009 that In ‘t Veld should be given access to parts of the documents, but the Council of Ministers heavily censored the files.

[20] Speaking in the European Parliament on 29 April 2015, In 't Veld criticised Nigel Farage's warning that Islamic extremists were likely to enter Europe among the influx of migrants and refugees from North Africa and the Middle East.

[26] In 2019, Dutch opinion magazine HP/De Tijd revealed that In 't Veld received reimbursements for years for untaken hotel stays in Brussels, the city where she resided.