GSA Federal Contracts — A Guide for Contractors
GSA is the federal government's central buyer and landlord. The Multiple Award Schedule (MAS) is the single largest cross-agency procurement vehicle. The Public Buildings Service (PBS) procures construction, leasing, and facilities work. Federal Acquisition Service (FAS) operates MAS plus a portfolio of GWACs and BPAs.
Components and sub-organizations that contract
- Federal Acquisition Service (FAS) — MAS Schedule, Alliant 2, OASIS+, VETS 2, 8(a) STARS III — government-wide vehicles.
- Public Buildings Service (PBS) — Federal building construction, leasing, facilities operations.
- Office of Information Technology Category — MAS IT (formerly Schedule 70) operating office.
- Office of Government-Wide Policy — FAR development, federal procurement policy.
Top NAICS purchased by GSA
541511— Custom Computer Programming541512— Computer Systems Design541611— Management Consulting236220— Commercial Building Construction531120— Lessors of Nonresidential Buildings541330— Engineering Services
Key contract vehicles to know
- Multiple Award Schedule (MAS) — 12-category mega-Schedule covering virtually all commercial products and services. Every federal agency can buy through it.
- OASIS+ — Government-wide IDIQ for professional services; replacing OASIS through 2028.
- Alliant 2 / Alliant 3 — Government-wide IT services GWAC.
- VETS 2 — SDVOSB-only government-wide IT GWAC.
- 8(a) STARS III — 8(a)-only government-wide IT GWAC.
Application strategy specific to GSA
GSA MAS is the dominant single decision for any small-business federal-services strategy. The MAS application takes 6-12 months and is non-trivial — but a current MAS contract opens every federal agency as a customer. For IT specifically, GSA's CALC tool lets agencies search MAS labor categories with rates, so competitive labor pricing matters more on MAS than on most agency-direct vehicles. PBS construction and leasing has its own contracting culture distinct from MAS; pursue PBS through the SAM.gov sources-sought / pre-solicitation process.
Common pitfalls
Many small firms pursue GSA MAS as a status symbol without quantifying whether it's the right vehicle for their pipeline — MAS administrative compliance (price reduction, mods, sales reporting) has real ongoing cost. If you only sell to one or two agencies, an agency-direct BPA is often a better vehicle. Another mistake: not understanding GSA's pricing methodology (Price Reduction Clause, Most Favored Customer pricing) before submitting MAS pricing — this commitment binds future commercial pricing across non-GSA business.
Related agency guides
Audience guides relevant to GSA
Always verify in the official source. Agency structures and procurement vehicles change. The authoritative source is the SAM.gov solicitation itself, plus the agency's own contracting page. This page is editorial reference, not an official agency notice.