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1 Only HR staff and few individuals should have access to these files. Keep for at least three years after the employee leaves the organization. Workers compensation is generally kept on file for the life of the employee or former employee.  I-9 forms - Keep I-9 forms separate and in a locked file area.
Businesses should keep employee time sheets for as long as they might need them for tax purposes. If the IRS requests the company's or an employees payroll or tax information, you may need the time sheets to verify that your forms are correct.I'd say keep the time sheets for at least 2 or 3 years.ou should keep employees time cards for at least one year. This  will allow for easy reference if any dispute arises when filing tax  forms.