Supplier onboarding is the moment a company decides that a new supplier is allowed to be paid, and in most small businesses it is not a process at all. Somebody starts buying, an invoice arrives, accounts payable sets the supplier up to pay it, and nobody ever asks for the W-9, the certificate of insurance or the signed agreement. Six months later the record has three hundred suppliers and no way to say which of them were ever checked. This page is about what onboarding has to collect, the stages that are worth having, and the test that says whether a supplier is actually onboarded, which is what the free vendor onboarding pack on this site scores.
What has to be collected, and why each one
Four documents carry almost all the value for a small US business. A completed W-9, because without a correct taxpayer identification you cannot file information returns correctly at year end and the IRS form linked below is the one to send. A certificate of insurance where the supplier comes on site or carries risk, with the expiry date recorded and not just the file. Bank details, captured once through a channel you trust rather than from an emailed invoice. And a signed agreement or accepted terms, so that what was agreed exists somewhere other than an inbox. Everything beyond those four is proportionate to what the supplier actually does.
Stages a small business can actually run
Four is enough: requested, checked, approved, active. Requested means somebody has asked to use this supplier and named themselves as the owner. Checked means the documents are in and the diligence proportionate to the spend has been done. Approved means a person with authority said yes, and that is recorded with a date. Active means buying can start. The value is not in the ceremony, it is that at any moment you can list every supplier sitting in checked, which is the queue that quietly never moves and the reason invoices arrive from suppliers nobody approved.
Supplier onboarding best practices that survive contact with a small business
Most published best practice is written for a procurement function with staff, and it does not survive a company where one person does this alongside their real job. The three that do survive: make the requester the owner, so chasing a document has a name attached rather than falling to whoever is tidiest; ask for the whole set at once rather than in three emails, because each round trip loses a week; and record an expiry against every document that has one, since an expired COI on file is worse than none, as it reads as compliance while providing none. The rest is detail you can add when the record exists.
The test: is this supplier actually onboarded
A supplier is onboarded when four things are true at once: the documents proportionate to what it carries are present and unexpired, a named person owns the relationship, someone with authority approved it on a date you can point at, and the agreed terms exist in writing. The free onboarding pack on this site scores exactly that and returns which of the four is missing, per supplier, from your own answers. It publishes no threshold about what is proportionate, because that depends on your spend and your risk, and it stores nothing between visits. Keeping the answers against the record, with the expiry dates raising themselves, is what the subscription does.
Questions people ask about supplier onboarding
What documents should be collected during supplier onboarding?
For a small US business: a completed W-9, a certificate of insurance where the supplier carries risk or comes on site, bank details captured through a trusted channel, and a signed agreement or accepted terms. Record an expiry date against anything that has one.
Who should own a supplier relationship?
The person who asked to use them. An owner named at request time is the difference between a document that gets chased and one that does not, and it is the field most missing from small-business vendor records.
How many onboarding stages does a small business need?
Four: requested, checked, approved, active. The point of the stages is being able to list everyone stuck in checked, which is where suppliers quietly sit while invoices from them are already being paid.
Does the onboarding pack store my suppliers?
No. It scores a supplier from what you enter and returns which requirements are unmet. Keeping every supplier, its documents and their expiry dates against the record is what the paid subscription does.