Standing Offer and Supply Arrangement Application (SOSA App)

The Standing Offers and Supply Arrangements Application, known as the SOSA App, is a secure, web-based Government of Canada application for finding federal standing offers and supply arrangements in one location. It holds information about instruments awarded to pre-qualified suppliers, so buyers do not have to hunt for them across separate sources. The CanadaBuys page on the SOSA App describes it in these terms.

The SOSA App is a federal procurement tool. It is not a NATO term or a general contracting standard. It is built for authorized public-sector users, which means the people who buy on behalf of government, not the businesses that sell to it. Suppliers still have a way to see the underlying information, which is covered below.

What the SOSA App contains and who can log in

The application contains information about standing offers and supply arrangements held by pre-qualified suppliers. Authorized users sign in with myKey or GCKey and can manage, update and search those instruments from one place.

Federal departments and agencies can access the application. So can eligible organizations taking part in the Canadian Collaborative Procurement Initiative (CCPI), once they have registered through their province or territory and Public Services and Procurement Canada (PSPC). PSPC explains this step on its page for organizations that have joined the collaborative procurement initiative.

The instruments behind the application

Two kinds of instrument sit at the centre of the SOSA App, and each has a distinct meaning.

• Standing offer: a non-binding arrangement under which a supplier agrees to provide specified goods or services, at agreed prices or pricing arrangements, when an authorized government department orders them.
• Supply arrangement: a pre-qualified supplier arrangement for defined goods or services. Departments generally use it to issue individual contracts or call-ups.

PSPC publishes and administers federal standing offers and supply arrangements, and authorized buyers reach them through the SOSA App.

Where federal buyers are pointed to the application

Government documents send buyers to the SOSA App when they need instrument details. Correctional Service of Canada refers users to it for information on PSPC standing offers and supply arrangements in its 2025-2026 procurement plan. PSPC's official-languages training procurement sends users to the application for the full standing-offer documents and detailed descriptions of services, as set out on its page on finding a copy of the standing offer.

The application also supports environmental procurement. PSPC added features to capture and track environmental considerations in procurement instruments, and buyers can apply a “green” filter to find instruments that contain them. See PSPC's page on greening procurement for details.

What the SOSA App means for a supplier

Businesses and suppliers do not log in to the SOSA App. Instead, they can download SOSA open data, which includes information about active standing offers and supply arrangements, through the Open Government Portal. The CanadaBuys SOSA page confirms this access rule.

A supplier must qualify under the relevant solicitation and be named on the resulting standing offer or supply arrangement before buyers can use that instrument for its goods or services. Once an instrument is in place, federal and CCPI buyers find it through the application. A supplier can use the open data to see which instruments are active and who holds them, which is useful for competitor research and for deciding which solicitations to pursue.