48 CFR §4.705-2

1. (a)Payroll sheets, registers, or their equivalent, of salaries and wages paid to individual employees for each payroll period; change slips; and tax withholding statements: Retain 4 years.
2. (b)Clock cards or other time and attendance cards: Retain 2 years.
3. (c)Paid checks, receipts for wages paid in cash, or other evidence of payments for services rendered by employees: Retain 2 years.