Vendor Onboarding at US Universities: W-9, Portals and P-Cards

What does a US university's accounts-payable office need before it can pay a new research-materials vendor (W-9 or W-8BEN-E, TIN match, exclusion screening, portal registration), how long it takes, and when a purchasing card is the faster route?

A US university's accounts-payable office needs a tax form, a registration and a clean exclusion check before it will create a payee record for a new supplier. For a domestic vendor the tax form is the IRS Form W-9. For a foreign vendor it is usually a Form W-8, in the entity version W-8BEN-E ^[1][2]. Until the payee record exists, a purchase order cannot be paid, whatever the lab has agreed with the vendor.

How long setup takes depends on the institution, the portal and how complete the vendor's first submission is. The lab cannot control the queue, but it can control the quality of what goes in. A vendor that is asked for the right documents once is set up faster than one that is chased three times.

Why a new vendor cannot simply be paid

Paying a supplier is a controlled event. The office must be sure the payee is a real entity, that it is reporting income correctly, that it is not barred from federal work, and that it is not a duplicate of an existing record. A vendor master file with errors in it is a standing audit risk, so offices guard who is allowed to add to it.

That is why the department cannot create a vendor by raising a requisition alone. The requisition reaches an approver, but the payment depends on a separate vendor-setup workflow with its own checks. Universities describe the workflow on their finance or procurement pages; Emory and UCLA are two examples of institutions that publish theirs, and the details differ between them ^[4][5].

W-9 for domestic vendors, W-8BEN-E for foreign vendors

Form W-9 is how a US person gives a payer a correct taxpayer identification number and certifies its status. The IRS describes it as the request for taxpayer identification number and certification ^[1]. The payer uses it to report payments and to apply backup withholding if the number is missing or wrong.

A foreign vendor is not a US person and does not use a W-9. The W-8 series documents foreign status. Form W-8BEN-E is the version for entities, used by foreign entities to document their status for chapter 3 and chapter 4 purposes and other provisions of the Code ^[2]. As listed on the IRS page when read on 10 October 2026, the form carries the revision date 10/2021, and the IRS page itself was last reviewed on 30 March 2026. Confirm the current revision on the live page before sending a form, because an outdated revision is a common reason for rejection.

The office, not the lab or the vendor, decides whether any tax withholding applies to a foreign payee. The lab's job is to get the correct form to the office. Do not advise a vendor on its tax status.

Number matching, duplicate checks and exclusion screening

After the form arrives, the office usually tests it. Common checks are matching the name and tax identification number against the IRS record, searching the vendor file for an existing record under a similar name or address, and screening against exclusion lists. Which checks apply, and in what order, is for the office to say, and they differ by university.

The exclusion check commonly uses the exclusions search in SAM.gov, the federal System for Award Management. It lists entities excluded from receiving federal contracts and certain federal assistance ^[3]. An institution spending federal funds has a reason to confirm that a vendor is not excluded before paying it from an award. Record the date of the search and the result in the vendor file.

Supplier portals: who invites, who uploads, how long it takes

Many universities now run vendor registration through a portal. The pattern is similar everywhere: the department or the office starts the request, the vendor receives an email invitation, and the vendor uploads the tax form and bank details itself. The office then reviews and approves.

Two practical points matter. The invitation goes to a named contact, so the lab must give the office the right person at the vendor, not a general sales address. And the vendor controls the speed of its own half; a portal request that sits unanswered in an inbox is the most common delay.

Turnaround varies. Offices publish targets ranging from a few days to a couple of weeks, and those figures change. Ask the office what its current typical time is and plan the first order around it. Do not promise the vendor a payment date until the record is approved.

Expect the office to ask questions the lab cannot answer, such as the vendor’s legal form, its remittance address or whether the name on the tax form matches the name on the quotation. Route those questions to the vendor through the named contact, and keep the thread. A short email chain showing who was asked what, and when, explains any delay and is useful if the setup is later reviewed.

Setup also has to be maintained. If a vendor changes its legal name, address or banking details, the office will want the change made through the same controlled route, with fresh verification, and not by an email to the lab. A change request that arrives informally is treated with suspicion by design.

Purchase order or purchasing card

A purchasing card, usually called a P-card, is a charge card issued to an employee under institutional policy. Because the payment goes through the card network, the vendor does not need a payee record in the university's system. That makes a P-card the faster route for a first, small order.

The limits are set by the institution: a per-transaction limit, a monthly limit, and lists of restricted categories. Many institutions bar certain categories from card use altogether or require a purchase order above a stated amount. Splitting a larger need into several card purchases to stay under the limit is prohibited by most card policies, for the same reason it is a problem under federal procurement rules.

What the department should send the vendor first

1. The name and email of the office or portal contact who will reach the vendor.
2. A statement of which form is needed: W-9 for a US vendor, W-8BEN-E for a foreign one.
3. A request that the legal entity name on the form match the name on invoices.
4. The remittance details the vendor wants used, which the vendor enters itself in the portal.
5. A request for the invoice format the office needs: PO number, itemised lines, lot numbers.
6. A named contact at the vendor for any verification call.

Never accept bank details by email and pass them on. Bank details belong in the portal or the office's controlled process, where the office can verify them independently.

Keeping the setup record with the procurement file

File the date setup was requested, the date it was approved, the form received and its revision date, and the exclusion search result with its date. These are small records, and they are exactly what a reviewer asks for when a payment to a vendor is questioned months later.

What to check next

Before approaching a new supplier, ask your accounts-payable office four things: which form it wants, whether it uses a portal, what its current setup time is, and what the P-card limit and category rules are. Then send the vendor those answers in one message. Doing this before the first order saves the delay that tends to appear after it.