Meta (formerly Facebook) Tax Court decision

The Facebook transfer pricing case is a useful reminder for multinational groups that, when valuable intangibles are transferred, arriving at an arm’s-length value is not the end of the analysis. How that value is paid can be equally important, particularly where the payment structure determines how future economic outcomes are reflected between the parties.

On 29 September 2026¹, the US Tax Court (the 'Court') issued a supplemental opinion in the Facebook transfer pricing litigation, following its earlier decision of 22 May 2025². The earlier decision focused largely on the value of the intangible rights made available to Facebook Ireland Holdings Unlimited ('Facebook Ireland') under the group’s cost-sharing arrangement ('CSA'). The latest opinion dealt with a different question: once an arm’s-length value had been established, how should that value be reflected in the payments made by Facebook Ireland?

In considering this question, the Court highlighted an important commercial point. The way a payment is structured can affect how economic risk, including future upsides and downsides, is shared between the parties.

The decision is not yet final and may be subject to appeal by either party. Accordingly, the Court’s findings and conclusions may be subject to further judicial review.

Background to the dispute

The case arose from Facebook’s international restructuring and CSA. Facebook’s US business made available to Facebook Ireland rights to exploit the Facebook platform in the rest of world ('RoW'), excluding the US and Canada. These included rights relating to Facebook’s existing technology, user community, and marketing intangibles.
Facebook Ireland was required to pay for those rights, and their arm’s-length value became the subject of a significant dispute with the Internal Revenue Service ('IRS').

In its May 2025 decision, the Court considered how the rights should be valued. It broadly accepted that interrelated intangibles could be valued together using an income-based approach. However, the Court examined the assumptions behind that valuation closely, including revenue forecasts, discount rates, expected returns, and potential new revenue streams.

This illustrates an important feature of intangible valuations: a reasonable methodology still depends heavily on the assumptions and financial projections that underpin it.

The September 2026 opinion then considered the next step: once the value was determined, how should Facebook Ireland pay for those rights?

One valuation does not necessarily mean one payment mechanism

This is perhaps the most interesting aspect of the supplemental opinion.

Although the technology, user-community rights and marketing intangibles could be considered together when determining their value, the Court did not conclude that they necessarily had to be paid for through a single, uniform royalty. The payment structure could instead reflect differences in the nature and expected economic lives of the underlying rights.

The distinction matters because different payment mechanisms can result in the parties bearing different levels of economic risk.

For example, a fixed payment creates a different risk profile from a royalty linked to future revenues. Two approaches might have a similar expected value at the outset, but the actual outcomes for the parties could be quite different depending on how the business performs.

The payment mechanism is therefore not simply a mathematical consequence of the valuation. It also forms part of the economic terms of the transaction.

Transfer pricing documentation should explain the commercial story

The decision also has practical implications for how significant intangible transactions are documented.

For groups involved in intangible property ('IP') migrations, licensing arrangements, cost contribution arrangements or other business restructurings, the documentation should do more than explain what the relevant rights are worth. It should also explain why the chosen payment structure makes commercial sense.

Relevant considerations may include:

• Why was a particular royalty base chosen?
• Why is the payment made over a particular period?
• How does the structure allocate risk between the parties?
• Do the intercompany agreements, valuation assumptions, financial forecasts and actual conduct all support the same commercial rationale? 

The valuation should therefore form part of a coherent explanation of the transaction, rather than being considered in isolation.

Why does this matter for Irish taxpayers?

The Facebook decisions were made under US transfer pricing and cost-sharing rules. However, the broader economic issues are relevant in the context of Ireland’s OECD-based transfer pricing legislation under Part 35A TCA 1997.

The OECD Transfer Pricing Guidelines place considerable emphasis on accurately delineating the transaction, including looking at the parties’ functions, assets and risks, their contractual arrangements and what they actually do in practice.

Where valuable intangibles are involved, the assumptions supporting a valuation can also be particularly important. Forecasts, discount rates, useful economic lives, terminal values, and other key assumptions may therefore attract close scrutiny.

In an Irish context, an Irish Revenue review of a significant IP transaction or restructuring could therefore extend beyond the valuation methodology itself. Multinational groups should be in a position to explain why the consideration was structured in the way it was, how that structure reflects the economics and risks of the transaction, and whether the arrangement has been implemented consistently in practice.

Key takeaway

The Facebook litigation illustrates that determining an arm’s-length value may only be one part of the transfer pricing analysis.

For multinational groups entering into or reviewing transactions involving valuable intangibles, how that value is paid, and the resulting allocation of economic risk between the parties, may be as important as the headline valuation itself.

How can RSM Ireland help?

For further information on this alert, or to discuss how these issues may apply to your business, please contact Ajay Singh, Tax Director (Transfer Pricing), Nuri Ozmen, Tax Manager (Transfer Pricing), or your usual RSM contact.

¹Facebook, Inc. & Subs. v. Commissioner, 167 T.C.
²Facebook, Inc. & Subs. v. Commissioner, 164 T.C.