As we have mentioned already – you are the responsible one for legalizing your stay. Thus, if you stay on the territory of Poland illegally – you bear the consequences. Remember that even one day of illegal stay may result in your deportation.
Of course, if it is your employer’s omission and you haven’t been called to complement documents legalizing your stay on time or your employer didn’t terminate the contract with you when your documents have expired, during the inspection of authorized bodies, he can also be brought to responsibility.
The authorities that are entitled to verify the legality of your stay are:
Border Guard, the National Labor Inspectorate, Police.