What is a supplier portal?

What is a supplier portal?

A supplier portal, or vendor portal, is a secure website that a buyer opens to its suppliers. Each supplier logs in to register, keep its company data, contacts and documents up to date, and exchange business documents with the buyer: requests for quotation, purchase orders, delivery notes, invoices and payment status. The supplier does the typing; the buyer checks and approves.

Take a common case. A maintenance contractor wants to know why its invoice has not been paid. Without a portal, it emails the buyer, who forwards the question to accounts payable, who looks in the ERP and answers three days later. With a portal, the contractor logs in and sees that the invoice is blocked because the goods receipt is missing, and who to contact. The same login lets it update an expired insurance certificate or confirm next week’s order.

This page explains what a portal is and how to choose one. The steps and checks that turn a new supplier into an approved record are explained in the supplier onboarding guide, and the tools that run them in supplier onboarding software. The software that manages the whole supplier record, of which the portal is the outside face, is compared in supplier management software.

What do suppliers do in a supplier portal?

Suppliers use a portal at each stop of the relationship, from registration to payment. Few portals cover every row below; the table helps you see which rows yours must cover, and what each row removes from today’s email traffic.

ERP documentation shows how this works in practice. Microsoft describes vendor collaboration in Dynamics 365 Supply Chain Management as a module for vendors that do not exchange documents with the buyer by electronic data interchange (EDI). Vendors work there with purchase orders, invoices, consignment stock and requests for quotation, and see part of their own vendor record. When a purchase order arrives, the vendor accepts it, rejects it, or accepts it with changes to dates or quantities. It cannot change prices, only suggest a change in a note. The buyer decides, vendor by vendor, whether prices are shown.

Sourcing in a portal is explained in the e-sourcing guide, and the order itself in what is a purchase order. What happens to an invoice once the supplier sends it is explained in invoice processing.

Which types of supplier portal are there?

Supplier portals come in four types. The difference that matters is whose portal it is: one buyer’s, or a shared one that the supplier uses for many buyers.

ERP portal

The supplier pages of the buyer’s ERP. Orders, receipts and invoices are already in the system, so nothing needs to be synchronised. Registration and sourcing features are often basic.

Source-to-pay suite portal

One supplier login for registration, questionnaires, sourcing events, contracts, orders and invoices, run by a suite that sends the results to the ERP. Useful when sourcing and buying sit in the same suite.

Business network

A shared platform where a supplier keeps one account and trades with many buyers that use the same network. The supplier enters its data once. Networks often charge suppliers above a threshold of use.

Public registration platform

A government site where suppliers register once to bid for public contracts, such as SAM.gov in the US federal market or the Central Digital Platform in the UK. It holds identity and eligibility data; it does not run the buyer’s orders.

A supplier portal is not the same as an e-invoicing network. A network such as Peppol carries structured invoices from the supplier’s system to the buyer’s system without either side logging in anywhere. A portal suits suppliers that send few documents and have no system to connect; a network or EDI suits suppliers that send many. Most buyers need both: a portal for the long tail of small suppliers, and a connection for the large ones.

In public procurement, registration is often a legal step. US federal rules require offerors and quoters to be registered in SAM at the time they submit an offer or quotation, with listed exceptions such as some micro-purchases. In the UK, since the Procurement Act 2023 came into force on 24 February 2025, suppliers register on the Central Digital Platform, receive a unique identifier and store their core organisational information there; only the contracting authorities a supplier chooses to share it with can see it.

Who pays for a supplier portal?

The buyer usually pays for its own portal, as part of its ERP or suite licence. Shared business networks can also charge suppliers, and that changes how suppliers see the project. A small supplier asked to pay a fee to send an invoice may refuse, or add the fee to its prices.

SAP’s training on SAP Business Network gives an example of a supplier fee model, as read on 27 October 2026. A standard account is free: the supplier answers purchase orders from interactive emails or by logging in, confirms lines, sends ship notices and creates invoices, without reports or system integration. An enterprise account adds reports, a dashboard across buyers and integration. Fees apply once a supplier passes both thresholds with one buyer in a rolling 12 months, 5 documents and $50,000: a yearly subscription and transaction fees of 0.155% to 0.35% of volume, capped at $20,000 a year per buyer relationship. SAP exempts some US suppliers from transaction fees, for example those selling to public sector buyers.

Public portals are generally free for suppliers. The US Treasury’s Invoice Processing Platform, which handles federal invoicing from purchase order to payment notification, states that it runs at no charge to federal agencies and vendors.

Before you choose, ask every vendor for its supplier fee schedule in writing, and tell suppliers what they will pay, if anything, in the invitation itself.

How do you keep a supplier portal secure?

A supplier portal is secure when nobody but the supplier can log in, and when a change of bank account cannot reach a payment without a second check. The bank account is the field fraudsters want. The FBI’s Internet Crime Complaint Center recorded about $2.77 billion of reported losses from business email compromise in 2024 and about $3.05 billion in 2025, a scam that targets businesses that work with suppliers and pay by wire transfer.

A portal moves the risk without removing it. Without a portal, the fraudster sends a fake email asking to change the bank account. With one, the fraudster tries to take over the supplier’s portal account and change the account there, which looks legitimate. Ask for these controls:

• Supplier users log in with a second factor, such as a code on a phone, and each supplier has an administrator who adds and removes its own users.
• A change of bank details puts payment on hold until someone at the buyer confirms it, by a call to a known contact or a bank check service, and someone else approves it. GAO’s internal control standards call this separation of duties: no one person controls every key step of a transaction.
• Name checks on the account are used where they exist: Verification of Payee for euro credit transfers since October 2025, Confirmation of Payee for UK payments.
• Every change is logged with the user, the date and the old and new value, and the supplier is told by email that its bank details changed.

How to rate and monitor the risk each supplier brings, including IT vendors that host your data, is explained in the vendor risk management guide.

How do you get suppliers to use the portal?

Suppliers use a portal when it saves them time and when the buyer stops accepting the old channel. Both are needed: a portal that is optional stays empty, and a portal that is compulsory but hard to use produces calls to procurement.

1. Count today’s traffic by supplier: invoices, order confirmations and payment questions per month. Start with the suppliers that create the most work.
2. Choose the first documents to move: payment status and invoices for most buyers, registration for new suppliers only.
3. Test registration with three real suppliers, including a small one and a foreign one, without help. Fix every question they ask before inviting the others.
4. Invite suppliers in waves, in their language, with the date after which invoices by email will no longer be accepted.
5. Give suppliers one support contact for portal questions, and publish short guides for the three most common tasks.
6. Count use each month: share of invoices and confirmations received through the portal, and supplier calls to accounts payable.

Large suppliers often refuse to log in to hundreds of customer portals. For them, ask whether the portal accepts invoices and order confirmations sent from their own system, by EDI, cXML or an e-invoicing network.

How do you choose a supplier portal?

Most buyers do not choose a portal on its own: it comes with the ERP, the suite or the supplier management tool they select. Judge that tool’s portal with the questions below, and run each test as a supplier, not as an administrator.

The full method to select the software behind the portal, from long list to scripted demonstrations, is in the supplier management software guide.

Which supplier portals will suppliers meet?

Suppliers meet the portals of their customers’ ERPs and suites, shared networks and public platforms. The table describes some of them from their owners’ public documentation, to show the range. It is not a list of recommended products.

Disclosure: the author works as an Ivalua consultant. The portals named in this section are described from their owners’ public documentation only, as read on the dates shown; this is not a ranking or a recommendation, and none was tested for this guide.