From India, Mumbai
From India, Delhi
From India, Bhopal
Minimum 5 year to preserve the left employees documents is advisable. Though there is no legal requirement, under Under Minimum Wages Act /Payment of wages Act the respective Controlling Authorities have the right to demand registers/documents for scrutiny purpose for a minimum past period as stipulated by the Act.
Added to the above in case of any offence committed by the left employees even Police Authorities may demand address proof and related stuff.
From India, Madras
But it is advisable for company to fully digitalize the service records of employees who have left services.
Company can keep the service records/personal files of left employees, as long as it remain intact.
From India, Aizawl