1. Is there a ban on donations from foreign interests to political parties?

Source: Political Parties Financing Act, 2013 (amended 2019)

All political parties and candidates may also receive unlimited contributions from private individuals and legal entities. Foreign donations are allowed, as well as, contrary to good practice, anonymous donations of up to EUR 1,000.
Source: OSCE/ODIHR (2017) The Netherlands, Parliamentary Elections, 15 March 2017. OSCE/ODIHR Election Assessment Mission, Final Report. OSCE/ODIHR, Warsaw