Every office that manages vendors eventually asks the same question: what are we actually supposed to be collecting? Here is the full field guide, organized by how each document behaves rather than alphabetically, because how a document behaves determines how you track it.
Standing documents: attached to the vendor, running on their own clock
Certificate of insurance (COI). The core document. A snapshot, issued by the vendor's insurance agent, showing the policies in force, their limits, and their expiration dates. Expires annually in most cases. Owned by whoever manages the vendor relationship. The single highest-volume item on any roster.
Additional insured endorsement. The companion page that actually extends a vendor's coverage to your entity. The certificate references it; the endorsement performs it. Collected alongside the COI and checked against your exact legal entity name. The most commonly missing document in otherwise complete files.
Trade and professional licenses. Contractor licenses, electrician and plumber cards, engineering licensure, and similar credentials. Renew on state or municipal schedules the vendor does not control and often does not watch closely. No agent in the middle: the chase goes straight to the vendor, and it is often slow.
Inspection certificates. Elevator, fire suppression, boiler, backflow, vehicle inspections. These attach to equipment or facilities the vendor operates. An expired inspection certificate usually means a physical-world gap, not a paperwork gap, which is exactly why it belongs on the roster.
Entity registration status. Whether the vendor's business entity is active with the Secretary of State. Not a document the vendor sends; a record the state publishes. Worth checking at onboarding and periodically after, since a lapsed entity behind a signed contract is a problem better found early.
Contract-anchored documents: attached to one job, released when it closes
Bid bonds. Guarantee that a bidder will enter the contract if awarded. Live only through the award process.
Performance and payment bonds. Required on public works above statutory thresholds in most states. The clock is the contract, not the calendar year: collected at award, held through the work, released at closeout. A bond producer, not an insurance agent, is usually the source.
Certified payroll records. Required on prevailing wage projects. Arrive weekly or per pay period during the work. Project-anchored and volume-heavy while active, then done.
Project-specific insurance riders. Some contracts require coverage beyond the vendor's standing policy: builder's risk, higher limits, owner's protective coverage. These follow the contract, not the vendor.
Documents that look like compliance items but usually belong elsewhere
W-9s. Needed before payment, owned by accounts payable, and carrying no expiration clock. Keep them in the finance file, not on the chase roster.
Background checks and clearances. The first question is who orders them. If your office orders the check, the vendor never held a document to chase. If the vendor supplies it, it behaves like a standing document with a renewal cycle. Decide which model applies before adding it to anyone's requirements.
The organizing principle
Standing documents fail quietly, by expiring unnoticed. Contract-anchored documents fail at transitions: award and closeout. A complete tracking system watches both, which mostly means two disciplines: a renewal clock on everything standing, and a checklist gate at contract signing and contract close.
Collect what the vendor actually holds, check it against what the contract requires, and keep the record of both. That is the whole job, at any scale.