Work in excess of normal working time under sections 8 and 10, is considered overtime work.For an employee who has reduced working time or is employed part-time, the working time that exceed the agreed hours but are within the normal working time are considered additional work.Overtime work and additional work are permitted if there is a special, time-limited need for increased work effort.Before overtime work and additional work are implemented, an employer shall, if possible, discuss the necessity of it with the employees or their representative.Required overtime may not exceed 200 hours in a calendar year.An employer is obliged to release an employee from performing overtime work and additional work when the employee requests it for health or weighty social reasons. An employer is also obliged otherwise to release an employee who requests it when the work can be postponed or performed by others without harm.An employer and an employee may agree in writing on overtime work of up to 400 hours in a calendar year.For overtime work in excess of normal working time under section 8, a supplement shall be paid in addition to the wages the employee receives for equivalent work during normal working time. The supplement shall be at least 40 per cent.