Other registers Retain 4 years or until audit, whichever is longer, then destroy. Retain 3 years or until audit, whichever is longer, then destroy. Retain 4 years or until audit, whichever is longer, then destroy. Wage and Income Tax Reports Retain 4 years or until audit, whichever is longer, then destroy. Unopened bids Return to bidder.
Capital improvements Permanent.
Duplicate copies Retain until obsolete, superseded or no longer having administrative value, then destroy. Purchase orders Retain 3 years or until audit, whichever is longer, then destroy. Requisitions Retain 3 years or until audit, whichever is longer, then destroy. Retain 3 years or until audit, whichever is longer, then destroy. Reimbursement Records Retain 3 years or until audit, whichever is longer, then destroy.