OTA vs FAR Contract: When to Use Each

What Is an Other Transaction (OT) Agreement?

An Other Transaction (OT) is a procurement instrument authorized by statute (primarily 10 U.S.C. 4021, 4022, and 4023 for DoD; similar authorities exist at DOE, DHS, NIH, and NASA) that is explicitly not a contract, grant, or cooperative agreement under the Federal Acquisition Regulation. Because OTs are not FAR contracts, they do not have to follow most FAR provisions, Cost Accounting Standards, or the Truthful Cost or Pricing Data Act (formerly TINA).

DoD uses three OT types: research OTs (10 U.S.C. 4021), prototype OTs (10 U.S.C. 4022), and production OTs (10 U.S.C. 4022(f), follow-on to a successful prototype). The prototype OT is the most common entry point for non-traditional defense contractors. A successful prototype OT can be followed by a sole-source production OT — the "prototype-to-production" pathway DoD uses to scale promising technology without re-competing the work.

What Is a FAR Contract?

A FAR contract is any procurement contract governed by the Federal Acquisition Regulation (Title 48 CFR Chapter 1). FAR contracts come in many forms — firm-fixed-price, cost-plus, time-and-materials, IDIQ, BPA, GSA Schedule orders — but all share the FAR's competition, pricing, accounting, audit, IP, and socioeconomic clause framework. For DoD, DFARS (Defense FAR Supplement) adds additional requirements.

FAR contracts are the default vehicle for the vast majority of federal procurement — everything from janitorial services to F-35 sustainment. They provide established legal precedent, mature audit and oversight processes, full and open competition by default, and a clear path for protests, claims, and disputes through the Government Accountability Office (GAO) and the Court of Federal Claims.

When to Pursue Each

Pursue an OTA when…

• The work is prototype, R&D, or novel technology not currently in DoD's portfolio
• Your firm is a non-traditional defense contractor (no DoD FAR contract performed at the prime level in the past year)
• You need to preserve commercial IP developed at private expense
• The program office wants to move from need-to-award in months, not years
• There is a credible prototype-to-production path with a fielded end-user
• You can access an OTA consortium (DIU, AFWERX, SOFWERX, NSIN, ARA, MTEC, S2MARTS, etc.)

Pursue a FAR contract when…

• The work is production, sustainment, services, or commodity buys
• The requirement is well-defined and the market is mature (existing solutions available)
• The agency requires full and open competition under CICA
• You want protest rights at GAO if the award goes elsewhere
• Your firm is traditional and the OTA non-traditional / cost-share rules don't apply
• The requirement is from a non-DoD civilian agency without OT authority

The biggest practical decision: if the program office is non-DoD or doesn't have an active OT consortium relationship, a FAR contract is almost always the only path. If the program is DoD prototype work, an OTA via a consortium is usually faster and IP-friendlier — but follow-on production is not guaranteed unless the prototype OT explicitly contemplates it and the prototype is judged successful per the agreement terms.

OTA Eligibility: The Three Paths

For a prototype OTA under 10 U.S.C. 4022, at least one of three eligibility conditions must be met:

1. Non-traditional defense contractor: a firm that has not, for at least one year prior to the OT solicitation, performed as a prime contractor on any DoD contract subject to full Cost Accounting Standards coverage. Most commercial firms, early-stage startups, and academic spin-outs qualify.
2. Significant non-traditional participation: the prototype project includes a non-traditional contractor or non-profit research institution participating to a significant extent.
3. Small business prime: the project is awarded to a small business as the prime, OR all significant participants are small businesses.
4. 1/3 cost share: at least one-third of the prototype cost is paid out of funds not provided by the federal government.

Traditional DoD primes often participate in OTAs by partnering with non-traditional small businesses or accepting cost-share — both legitimate paths, but they require structure upfront. If your firm is a traditional prime with no non-traditional partner and no cost share, an OTA is generally not available.

Prototype-to-Production: The Sole-Source Follow-On

The most strategically important OTA feature is the follow-on production authority in 10 U.S.C. 4022(f). If a prototype OT was awarded competitively and the prototype project is successfully completed, DoD may award a follow-on production OT (or even a follow-on FAR production contract) on a sole-source basis — without re-competing the production work.

This is the "prototype-to-production" pathway. A small non-traditional that wins a prototype OT and successfully demonstrates can transition into production worth hundreds of millions or billions of dollars without facing the typical FAR competition cycle. The prototype OT must explicitly contemplate follow-on production in its terms for this authority to apply, and the prototype must be judged successful by the agreements officer.

FAR contracts do not have an equivalent path. A successful FAR prototype contract under FAR Part 35 generally cannot be followed by a sole-source production award unless one of the narrow FAR Part 6 exceptions to full and open competition applies (single source, international agreement, national security, etc.).

Related vehicle comparisons: FFP vs Cost-Plus, IDIQ vs BPA, and FAR vs DFARS for the FAR family. For the OTA consortium ecosystem, see the Department of Defense entity page for active programs and consortium-managed solicitations.