OASIS+ is the Government-Wide Acquisition Contract (GWAC) that federal agencies use to buy complex professional services. Think management consulting, engineering, program management, logistics, scientific research, and IT services that don't fit neatly into a pure IT vehicle like Alliant 2. GSA estimates the total ceiling across all domains at over $60 billion over a ten-year ordering period.
If you're a small business or a diverse firm trying to break into federal professional services, OASIS+ is one of the most important vehicles to understand. Getting on it doesn't guarantee revenue, but not being on it locks you out of a significant share of federal spend at DoD, DHS, and dozens of civilian agencies.
What OASIS+ actually is
OASIS+ is a multiple-award IDIQ (Indefinitely Delivered, Indefinitely Quantified) contract. That means GSA awards it to many contractors, then agencies issue task orders against it for specific work. No money flows at the GWAC level; the money flows when an agency issues you a task order.
It replaced the original OASIS contract, which ran from 2014 and expired. The new vehicle launched in 2023. GSA structured it around six functional domains rather than the old "pools" based purely on business size. The domains are:
- Management and Advisory
- Technical and Engineering
- Research and Development
- Enterprise Solutions
- Intelligence Services
- Environmental Services
Each domain has separate tracks: one for unrestricted (any size company) and one for small businesses. Small business tracks are further segmented by socioeconomic category: 8(a), HUBZone, WOSB, SDVOSB, and small business (SB) with no set-aside designation.
Which pool is right for your firm
Pick domains based on your existing past performance, not on where you think the money is. GSA scores on demonstrated capability. If you've been doing environmental consulting but you apply to Management and Advisory because the ceiling looks bigger, you'll score lower and potentially not make the cut.
You can apply to multiple domains if you have documented past performance in each. The application isn't a blanket "I do all of this." GSA wants contract references that map directly to the domain's scope.
For small businesses with a socioeconomic designation (8(a), HUBZone, WOSB, SDVOSB), apply to the designated small business track in your domain. You'll compete for set-aside task orders that are off-limits to larger companies. That's a real competitive advantage, especially at agencies with meaningful small business subcontracting goals.
The on-ramp process
GSA opened the initial on-ramp in 2023 and made awards in 2024. The vehicle is designed with periodic on-ramps, meaning you can get on OASIS+ even if you missed the first wave. GSA has stated the intent to hold on-ramps roughly every two years, though timing can shift.
When an on-ramp opens, GSA posts a solicitation on SAM.gov under the OASIS+ contract family. The evaluation is self-scoring. You submit a Streamlined Application, which includes:
- Past performance references (typically three, must meet minimum contract value thresholds)
- Relevant experience narratives tied to domain-specific labor categories
- Qualifications of key personnel (usually including relevant certifications like PMP, DAWIA, or professional licenses depending on domain)
The minimum past performance contract value thresholds vary by domain and track. For unrestricted, thresholds are higher. For small business tracks, they're lower to account for the scale at which small firms typically work. Check the current solicitation carefully, because these numbers changed between the original OASIS solicitation and OASIS+.
GSA uses a scoring methodology where you self-assess and then substantiate. Applications without documentation to back up claimed points are downgraded or disqualified. This is not a narrative-heavy RFP. It's closer to a checklist with evidence requirements.
Joint ventures and teaming
Joint ventures are explicitly permitted on OASIS+. A JV between an 8(a) firm and a large business, structured properly under SBA regulations (13 CFR Part 125), can compete on the small business 8(a) track as long as the 8(a) member meets SBA's affiliation and mentor-protégé rules.
This opens a significant path for small and diverse firms that don't yet have sufficient past performance on their own. A JV lets you combine your socioeconomic status with a larger partner's contract history to meet the scoring thresholds.
Two points to know before structuring a JV for OASIS+:
First, the JV entity itself must be registered in SAM.gov with its own unique entity identifier (UEI). The JV is the offeror, not the individual members.
Second, GSA scrutinizes JV agreements. The 8(a) or small business member must hold at least 51% ownership in the JV and must perform the percentage of work required under SBA's ostensible subcontractor rule. Don't structure a JV where the small firm is a pass-through in name only; that creates legal exposure for both parties and GSA has rejected applications for this reason.
Winning task orders after you're on the vehicle
Getting on OASIS+ is the prerequisite. Winning work is a separate challenge.
When an agency needs professional services, it can either compete the task order among all OASIS+ holders in a relevant domain and track, or set it aside for a specific socioeconomic category. Agencies with OASIS+ ordering authority include DoD components, DHS, the State Department, HHS, and dozens of others. The GSA OASIS+ ordering guide lists authorized ordering agencies.
Task order competition typically follows one of two paths:
Simplified acquisition: For task orders under $250,000 (the simplified acquisition threshold under FAR Part 13), agencies can use streamlined procedures. Response times are shorter, requirements are less complex, and the evaluation is faster.
Full and open competition: For larger task orders, agencies issue a Request for Task Order Proposal (RTOP) with detailed performance work statements, evaluation criteria, and submission requirements. These can look like standalone RFPs in terms of length and complexity.
Your proposal strategy on task orders matters as much as your presence on the vehicle. Agencies evaluate past performance, technical approach, and price. For professional services, labor category mix and staffing plans often carry significant weight. Know the agency's budget cycle. Most civilian agencies obligate the bulk of their discretionary funds between August and September (the end of the federal fiscal year), so task orders often award in Q4.
Build relationships with contracting officers and program managers before an RTOP drops. OASIS+ task orders are competitive, and agencies tend to award to firms they've seen before in industry days, sources sought responses, and prior task order work. If you're new to an agency, a sources sought response (before the RTOP) is the lowest-friction way to get your name in the file.
Three action steps
- Pull the current OASIS+ on-ramp status from SAM.gov. Search for "OASIS+" under contract opportunities and check the status of open solicitations. If no on-ramp is active, set a SAM.gov alert for the contract family so you're notified when one opens.
- Map your three strongest past performance references to OASIS+ domains and calculate whether they meet the minimum contract value thresholds for your target track. If they fall short, identify active work you can document before the next on-ramp.
- If you have an 8(a), HUBZone, WOSB, or SDVOSB designation, research OASIS+ task order history at your target agencies using USASpending.gov. Filter by OASIS+ contract number and your domain. That list shows you who's winning, what they're winning, and at what price points. It's the fastest way to identify which agencies are actually using the vehicle for your type of work.
