Foreign Military Sales (FMS) is the US government-to-government process for selling defense equipment and services to allied and partner nations, and it compresses contractor margins mainly through offset agreements — commitments to send work, technology, or investment to the buying country as a condition of the sale. These offsets, which can include co-production, technology transfer, or local subcontracting, are not part of the contract's headline price and often surface later as cost growth or reduced profit on that specific case. The Government Accountability Office flagged this dynamic decades ago, noting that no single US agency monitors offset activity across the government, which leaves investors and even contractors themselves without a clean, centralized way to size the exposure.
That gap has not fully closed. Offsets remain negotiated bilaterally between a contractor and a foreign government, layered on top of a government-to-government FMS case, and their true cost typically shows up in gross margin erosion on international programs rather than in a separate line item. For readers tracking government-news around defense budgets and contracts, offsets are one of the least visible cost drivers in an industry that otherwise reports revenue in fairly predictable patterns.
This piece walks through how FMS deals are structured, why offsets and local production requirements squeeze margins, and what to watch for in a contractor's own disclosures.
How does a Foreign Military Sale actually work?
An FMS case begins with a foreign government's request, which the State Department reviews for approval before the Defense Department negotiates a Letter of Offer and Acceptance (LOA) — the formal document defining what is being sold, at what price, and under what terms. Once signed, a US contracting officer executes a contract that must incorporate the LOA's terms directly, according to Defense Department acquisition guidance published in the Procedures, Guidance, and Information supplement to the DFARS.
That guidance also directs contracting officers to combine US and FMS requirements on the same contract where practical, for efficiency, and to identify FMS work with a distinct case identifier in the contract schedule. Shipping terms, inspection procedures, and country-specific documentation are all specified up front, per the same acquisition guidance. None of this determines price competitiveness or offset terms — those are negotiated separately, often directly between the contractor and the buying government, sitting outside the formal FMS contracting chain the Pentagon administers.
What are offsets, and why do they cut into margin?
Offsets are commitments — commonly co-production, licensed manufacturing, technology transfer, subcontracting, training, or local investment — that a foreign government requires as a condition of purchasing defense articles, according to a summary of the regulatory framework from the law firm Steptoe covering Commerce Department offset reporting rules. They are not charity: they are the buyer's price for the sale, paid by the seller in the form of work, know-how, or capital sent abroad instead of kept in-house. Readers following this should also see The War Department Renaming: What Actually Changes in Law.
The mechanism that cuts margin is straightforward. A contractor wins an FMS case at a negotiated contract price, then must separately fulfill an offset obligation that can mean opening a local production line, subcontracting a portion of the build to firms in the buyer's country, or transferring technical data package rights. Each of those carries a cost the original bid may or may not have fully priced in, particularly on multi-year programs where offset terms get renegotiated or expanded after signature.
The Government Accountability Office's early review of offsets found that no single US agency tracked their cumulative effect on the domestic defense industrial base, and that Congress had to legislate a presidential reporting requirement in 1984 covering offsets' impact on defense preparedness, industrial competitiveness, employment, and trade, according to the GAO's 1985 testimony on foreign military sales and offsets. That same testimony noted GAO's position that offsets should not be paired with FMS financing credits, because the foreign buyer would otherwise receive a double benefit — financed purchase terms plus offset work sent to its own industry.
How has offset reporting changed since export control reform?
The scope of what counts as a reportable offset has widened over time. In 2015, the Commerce Department's Bureau of Industry and Security proposed extending offset reporting requirements to cover items in the "600 series" of Export Control Classification Numbers — categories that had migrated from the State Department's US Munitions List to the Commerce Control List under Export Control Reform, according to Steptoe's analysis of the proposed rule. Before that change, many of those items sat outside the reporting regime because they were no longer classified as traditional munitions, even though they remained defense-related hardware or technology.
The practical effect for contractors: more of what they sell abroad, including systems that shifted from tightly controlled munitions status to the broader Commerce list, can now carry a formal offset reporting obligation. That does not change how much offset a foreign buyer demands, but it does mean more of that activity becomes visible to regulators, even if it stays invisible in a company's public financial statements.
What does this look like in a contractor's earnings and disclosures?
Public defense companies do not typically break out offset costs as a separate line in earnings releases. Instead, offset exposure tends to appear indirectly, through segment-level gross margin that runs lower on international programs than on comparable domestic ones, or through commentary about "geographic mix" affecting margin in a given quarter. A company's own press materials — announcements of a new production facility abroad, a joint venture with a local partner, or a licensing arrangement — are often the clearest public signal that an offset obligation is being fulfilled, even when the release frames it as a partnership or capability announcement rather than a cost.
Oshkosh Defense, for example, has publicized its work with regional partners at international arms exhibitions, describing programs like its Eitan armored personnel carrier hull work as providing "customers with leading innovation," according to the company's own IDEX 2023 announcement. That is the company's characterization of its work, not an independent assessment of the underlying deal's offset terms or its margin effect. Investors and reporters generally cannot verify from a press release alone whether a given local production arrangement was offered competitively or was a required offset commitment attached to an FMS or direct commercial sale.
Practical steps: what should investors and reporters watch for?
Because offsets rarely appear as a labeled cost, the more reliable approach is triangulation across several disclosure types rather than looking for a single number.
- Compare segment gross margin trends between a company's domestic and international defense revenue over several quarters, where that breakout is disclosed, rather than relying on a single period.
- Read joint-venture and local-production announcements as potential offset fulfillment, not purely as market expansion, especially when they follow shortly after a major FMS case announcement involving the same country.
- Track whether a company discloses offset-related contingent liabilities or performance guarantees in its financial statement footnotes, since these can signal obligations that extend years beyond the original sale.
- Watch export licensing and classification changes, since a shift in how an item is controlled can change whether related offsets must be reported, per the Commerce Department's 600-series expansion discussed above.
None of these signals substitutes for a company's own disclosed guidance, but together they narrow the gap between the contract value reported at signing and the margin a program actually delivers years later.
What remains unknown
The scale of offset obligations across the current FMS portfolio, and their aggregate effect on contractor margins today, is not something the available public record quantifies with precision. The GAO's foundational findings on the lack of centralized offset tracking date to the 1980s; whether a comparably comprehensive government-wide accounting exists now is not established by the sources reviewed here. Readers should treat any specific margin-impact figure for an individual program as a company disclosure or estimate, not as verified fact, unless it is tied to that company's own reported financials. For related context on how defense budget cycles and procurement mechanisms shape contractor revenue, see coverage of how the Pentagon uses Other Transaction Agreements to skip the FAR and how program backlogs translate into future revenue signals within the broader industry. We covered a connected angle in How the Pentagon Uses Other Transaction Agreements to Skip the FAR.