The possibility of issuing medical certificates electronically in Poland arose in 2016, and since 1 December 2018 this has been the only acceptable form of issuing them (paper certificates can be issued only in certain exceptional situations). This also applies to certificates of temporary incapacity to work due to illness, i.e. sick notes. Today, almost every sick note goes directly to the employer, without the employee’s involvement. This may raise doubts whether the employee still needs to inform the employer of his or her absence from work due to sickness. Similar concerns may arise now when an employee is placed under mandatory quarantine or home isolation in connection with COVID-19.