OTA cost share: what it actually means

The sentence everyone gets backwards

The line repeated in teaming calls is that "an OTA requires a one-third cost share." The statute says something else. Under 10 U.S.C. § 4022(d)(1), the Department may not enter a prototype other transaction unless one of four conditions is met, and cost share is the third of them. The other three are a nontraditional defense contractor or nonprofit research institution participating to a significant extent; all significant non-federal participants being small businesses or nontraditional defense contractors; or a written determination by the agency's senior procurement executive that exceptional circumstances justify the instrument. Satisfy any one of those and the cost-share condition never comes up. It is a door, not a toll.

That distinction decides whether a firm walks into a prototype negotiation owing money or owing nothing. It also decides how a prime structures a team. Most of the confusion in this area comes from reading four alternatives as one stack of requirements, and the rest comes from misreading the fraction itself.

The exact words of the condition

Paragraph (C) reads: "At least one third of the total cost of the prototype project is to be paid out of funds provided by sources other than the Federal Government." Two words in that sentence carry most of the weight. Total sets the denominator at the whole project, government money included. Sources is broader than "parties," and DoD's guidance treats it that way: the share does not have to come from the lead performer.

The condition was not always there. DoD's own history of the authority puts the introduction of cost sharing and the nontraditional defense contractor category at section 803 of the FY2001 NDAA, and the exemption of small businesses from the cost-sharing requirement at section 812 of the FY2015 NDAA. Each change moved in the same direction, which was toward letting new entrants in without asking them to buy their way in.

One more provision is worth knowing before the arithmetic. Under § 4022(d)(3), the conditions in subsection (d) do not apply to follow-on production contracts or transactions awarded under subsection (f). A cost-share obligation accepted for a prototype does not follow the work into production.

One third of the total is half of the government's money

Call the government's contribution G and the non-federal contribution N. The condition is N ≥ (G + N) / 3. Solve it and you get N ≥ G / 2. A team that owes the one-third share is committing at least fifty cents for every government dollar, not thirty-three.

This is the single most common costing error in the area, and it is expensive in exactly the place a firm cannot absorb it: after selection, during agreement negotiation, when the price is already on the table.

The ratio is invariant, which is the useful part. Whatever the size of the effort, the required non-federal share is half the government's number and one third of the combined total. If a proposal shows the team contributing less than half of what the government is putting in, the one-third condition is not satisfied and the agreements officer cannot use it as the basis for award.

The obligation also does not stop at signature. Defense Innovation Unit guidance instructs agreements officers to confirm the one-third share is sustained through performance of the agreement, including any modifications and any change to the structure of the performing team. Add scope, drop a teammate whose contribution was carrying part of the share, and the arithmetic has to be redone.

Almost nobody pays it

The public record on this is unusually clear. The Department's Report to Congress on the use of prototype other transaction authority in fiscal year 2024, issued in August 2025, records 7,409 OT actions totaling roughly $18.03 billion obligated. Of those obligations, 93 percent went to awards with significant participation by a nontraditional defense contractor. The remaining 7 percent went to traditional contractors without such participation, and that narrow band is where the cost-share condition and the exceptional-circumstances determination live.

Dollar figures for the contributions themselves are harder to find, because the annual reports track participation rather than cost-share totals. The most detailed public accounting remains the Department's March 2017 Report to Congress assessing cost sharing in prototype agreements. It found that in FY2016 DoD obligated about $1 billion under the authority and received $68 million in cost-share contributions once two large outliers were set aside, an average rate of roughly 4 percent across four fiscal years, or about 8 percent with the outliers included. Over that same four-year window, exactly one award rested on an exceptional-circumstances determination.

The 2017 assessment drew the conclusion the numbers support. A low cost-share rate is evidence the structure is working as designed, because it means traditional contractors are answering the incentive by bringing nontraditional and small-business performers onto their teams rather than writing checks. The report was blunt about the purpose: the premise for requiring a share has long been DoD policy, and that premise is not to supplement appropriations.

Current guidance says the same thing from the government's side of the table. The OT Guide tells agreements officers they may structure a resource-sharing arrangement even where no statute requires it, but that they should not do so when the primary purpose is to cover a program shortfall, and should not generally mandate it for defense-unique items or where the statute does not require it. Resource sharing is meant for situations where the performer gets a commercial or other benefit from the work.

What counts

Where a share is required or offered, the standard is the one federal cost policy uses everywhere: contributions may be cash or non-cash, direct or indirect, so long as they are allowable, allocable, reasonable, and consistently accounted for by the performer. Cash is preferred, because it is easier to value and represents a firmer commitment.

Direct cash outlays. Labor with its associated benefits and overhead, materials, equipment purchased for the effort, facilities costs. These are the cleanest contributions to document and the easiest for an agreements officer to accept.

In-kind resources. Equipment usage, facilities, materials, software licenses, intellectual property rights, personnel already on staff. Guidance describes these as harder to value and generally less desirable than cash, though often genuinely useful to the program. They have to be allocable, measurable and verifiable, which in practice means a written valuation methodology.

Independent research and development incurred for the project. This is the provision that surprises people. IR&D that a firm may later recover through overhead rates on other awards can still count as its share of a prototype OT. The limit is timing, addressed below.

GAO documented a concrete example in its November 2019 review of the authority. In an Army prototype other transaction with Lockheed Martin, valued at the time at $17.5 million for two removable sensors for unmanned aircraft, there was no nontraditional participant on the team, so the company had to pay at least one third of project cost. It met the obligation with a combination of in-kind contributions, including test articles, and independent research and development funds.

What never counts

The exclusions are where proposals fail, and most of them are exclusions of things a firm has genuinely spent money on.

• Costs incurred before the agreement takes effect. Section 4022(d)(2)(A) is explicit. There is one narrow exception in (d)(2)(B): costs incurred after negotiations began but before the effective date may count if the responsible official determines in writing both that the party incurred them in anticipation of the transaction and that incurring them early was appropriate to ensure successful implementation.
• Prior independent research and development. IR&D conducted before award is outside the arrangement, even though IR&D incurred for the project is inside it.
• Previously funded government research. Work the taxpayer already paid for cannot be contributed back as a non-federal share.
• Foregone fee or profit. Not on this agreement, not on another one. A discount is not a contribution.
• Cost of money. Excluded as inconsistent with general cost principles.
• Indirect costs not allocable to the agreement. Allocability is a real test here, not a formality.
• Anything sourced from the federal government. The statutory phrase is "sources other than the Federal Government," which rules out another federal award, including SBIR or STTR funds, as the non-federal share.

Valuing an in-kind contribution

Equipment and facilities are valued at depreciated value, or at a reasonable usage charge where the asset is already fully depreciated. The factors an agreements officer is told to consider are the original cost of the asset, the estimated remaining useful life at the time of negotiations, the effect of increased maintenance charges or reduced efficiency due to age, and how much depreciation has already been charged to procurement contracts.

Intellectual property is harder and the guidance is direct about it. The value of IP does not include its research or development expenses, which are sunk. Valuation should rest on sound estimates of market value through licensing or another commonly used methodology. A firm that wants to contribute a model, a library, or a dataset as part of its share should arrive with a defensible valuation rather than a development-cost total, and should expect the number to be negotiated.

What happens after the agreement is signed

A cost-share commitment creates reporting and monitoring obligations that a milestone-paid prototype agreement would not otherwise carry, and this is the part most often left out of the internal business case.

Government payments should track its share as the work progresses rather than front-loading the federal contribution. The agreement should state the share ratios, the expected contributions of each party, the sources of the shared assets, and the amounts from each. It should also define what happens if a party cannot make its investment, which means naming the conditions that trigger an adjustment and the procedure for making one. Where the one-third condition is the statutory basis for the award, guidance calls for financial reporting that gives visibility into both government and private-sector expenditure, along with appropriate audit access.

Separately, under § 4022(c)(1), a prototype or follow-on production other transaction providing for payments in excess of $5 million must include a clause giving the Comptroller General access to records. That clause is not required for research other transactions.

Research other transactions run on a different rule

Prototype authority under § 4022 is not the only other transaction authority, and the cost-share posture of the other one is close to the opposite. For research other transactions under 10 U.S.C. § 4021, the statute directs that, to the extent the Secretary determines practicable, the funds the government provides do not exceed the total amount provided by the other parties. In effect that is dollar for dollar, and resource sharing is far more common in research OTs than in any other type.

The rationale is the dual-use origin of the authority. If the technology has both military and civilian value, the government expects the performer to invest alongside it and to have an incentive to commercialize. Two consequences follow that matter commercially. The goal is stated as resource sharing rather than resource matching, so the assets offered must be reasonably necessary for the research and actually used in the work, not merely equal in dollar value to the government's investment. And a resource-shared research OT does not pay profit or fee to the performer, because a fee would skew the ratio the sharing arrangement is meant to create.

The word doing the work in that statute is "practicable," and the guidance interprets it plainly: if cost sharing helps push the project forward, it is practicable; if it becomes an obstacle, it is not.

How the regimes compare

A partner or program office weighing pathways is usually comparing more than two instruments, and the cost-share rules differ enough that they should be set side by side before anyone builds a price.

The grant rule is worth reading closely even outside the grant world, because it states the criteria plainly. Where cost sharing is accepted, it must be verifiable in the recipient's records, necessary and reasonable for the objectives, allowable, provided for in the approved budget, not counted as a contribution toward any other federal award, and not paid by the federal government under another federal award. Those are the same instincts an agreements officer brings to a prototype OT resource-sharing package, arriving from a different regulation.

Seven things to settle before you sign

Name the condition in writing. Ask the agreements officer which of the four conditions the award rests on and get the answer in the file. If it is nontraditional participation, cost share is off the table and should not appear in the price.

Do the division correctly. Half the government's number, not a third of it. Run it before the price is submitted, not after selection.

Price the share as real money. Cash contributions are still cash. In-kind contributions still consume capacity that cannot be sold elsewhere during the period of performance.

Say where every dollar comes from. Team member, investor, credit line. The government wants the split and the authority to commit it settled at award, not discovered later.

Draft the adjustment mechanism. If a contributor falls short, the agreement should already say what happens. Silence here turns a shortfall into a dispute.

Re-run the math at every modification. Added scope and changed team composition both move the denominator.

Do not offer a share you were never asked for. Voluntary cost share buys less than firms assume, and DoD guidance discourages using it to fill a program's funding gap.

Common misreadings

Bottom line

Cost share in the other transaction world is a qualifying condition, not a pricing convention. For a firm that is nontraditional under 10 U.S.C. § 3014, or a team whose significant participants are small businesses or nontraditional contractors, it is a rule that describes someone else's problem. For a traditional prime without such a teammate, it is the difference between a bid and a joint investment, and it should be priced that way from the first internal review.

The federal data has been telling the same story for a decade. The condition exists to move traditional contractors toward new performers, and it has largely done that, which is why the measured cost-share rate stayed low while obligations under the authority grew several times over. Read the fraction correctly, read the exclusion list before counting anything, and put the source of every dollar in the agreement.

Frequently asked questions