As per the pension law, an employee and his/her employer must pay contributions from the day an employee started employment with the respective employer. Accordingly, if a new employee has been registered late and a contribution payment(s) has not been made, all parties should pay their share for the service period not yet paid.
Please also note, as per the pension law, an employer will incur a penalty/fine for any overdue contribution payment(s), and any period not paid for will be deducted from an individual's total service period.