You do not really apply for a GSA contract, although many people use that term in discussing the process for obtaining a GSA contract. A firm actually prepares a proposal, or offer, and submits it to GSA for review. Once reviewed and found acceptable, GSA will then negotiate pricing and if found acceptable, will then award a contract.
To get a GSA contract, a firm must go through several steps. below is a summary of the steps a firm goes thugs to become an approved GSA contractor.
After submitting the proposal, be prepared to answer clarifying questions from a GSA Contracting Officer, supply additional information, and negotiate your final offer. When your contract is awarded, you can then upload pricing to GSA Advantage and start marketing under your schedule.