I am a Ukrainian citizen and I have decided to start working in Poland. Do I need to obtain a PESEL for this? Do I need to obtain a NIP? If yes, which one and how to do it?

Any Ukrainian citizen who resides in Poland legally may be employed, so there is no obligation to obtain a PESEL number first.Both persons with a residence permit and Ukrainian citizens who entered Poland after 24 February (even if they have not yet obtained a PESEL number) can be employed under simplified rules. The only requirement is that within 14 days from the date of taking up employment the employer notifies the competent district labour office – competent for the seat or place of residence of the employer. The employer notifies the office electronically on the portal praca.gov.pl.