A trading company receives notice that its principal shareholder has been added to the SDN List (OFAC's list of Specially Designated Nationals and blocked persons). Simultaneously, the same individual appears on the UK Consolidated List (the list maintained by His Majesty's Treasury under OFSI). Two jurisdictions. Two designations. Two entirely different processes for challenging them. The business needs to act – but the routes diverge sharply, and the clock runs differently in each.
As of February 2026, a designated party seeking removal from the SDN List submits a delisting petition (a formal request for administrative reconsideration) directly to OFAC under the procedures set by IEEPA and the relevant programme regulations. In the United Kingdom, the equivalent challenge is a request for reassessment addressed to OFSI under SAMLA and the relevant thematic sanctions regulations, with an independent review route and a statutory appeal pathway available as a backstop. The substantive tests, the evidence standard, the timeline, and the downstream legal routes differ materially between the two regimes – and a business with dual designations must manage both in parallel without treating one as a template for the other.
This analysis maps the key procedural and substantive divergences, identifies the risk flags that practitioners encounter most often, and explains when cross-border counsel becomes essential.
How does OFAC's delisting process work?
OFAC's administrative delisting process is the primary route for a designated person or entity to seek removal from the SDN List, and it operates entirely within the executive branch of the US government. A petition is submitted in writing to OFAC's Office of Global Targeting, setting out the grounds for reconsideration and supporting the submission with documentary evidence. OFAC is not bound by a statutory deadline for its response, and in our experience the process can extend over many months – sometimes considerably longer – depending on the programme, the complexity of the facts, and the volume of concurrent designations.
The legal standard for a successful petition turns on whether the grounds for the original designation continue to apply. That standard is driven by the designation criteria set in the relevant executive order and programme regulations under IEEPA. The petitioner must either demonstrate that the factual basis for the designation was wrong at the time, that the facts have materially changed since designation, or that the petitioner no longer meets the criteria. Demonstrating change of circumstances is usually the more productive route. Arguing original error requires the petitioner to overcome a high evidential bar, because OFAC's classification procedures are not fully transparent and the agency has broad discretion.
One procedural feature that practitioners must keep in mind: OFAC may share the petition with other US government agencies whose equities touch the programme in question, and those agencies have an opportunity to weigh in. That inter-agency dimension can extend timelines unpredictably. It also means that the strength of the legal argument alone is not always the controlling variable.
The position above covers the standard petition pathway. Your facts – the programme under which the designation was made, the nature of the nexus, the availability of supporting witnesses and documents – will change the analysis significantly.
For a confidential assessment of your OFAC petition prospects, contact Calder & Vance at info@caldervance.com.
How does OFSI's reassessment and review process differ?
OFSI's process for challenging a UK financial-sanctions designation operates under a statutory architecture that OFAC's administrative route does not replicate. Under SAMLA and the relevant thematic regulations, a designated person may request that OFSI reassess the designation. OFSI must conduct that reassessment and communicate its decision. If the outcome of the reassessment is adverse, the designated party may apply for a ministerial review – a further layer of internal government scrutiny by a minister who was not involved in the original designation decision. Beyond that, a statutory right of appeal to the court provides a judicial backstop.
That layered structure creates a procedural pathway that is, on its face, more transparent than the OFAC equivalent. The involvement of independent judicial scrutiny at the appeal stage means the evidence standard must be built with litigation in mind from the outset, not retrofitted if the administrative route fails. In our practice, we treat the evidence package for an OFSI challenge as a document that must be court-ready even at the reassessment stage – because the same material will be tested at appeal if the administrative process does not produce removal.
The substantive test under the UK regime differs in another important respect. OFSI must be satisfied that the designation criteria are met on the balance of the available information. The designated party challenging that assessment needs to displace the evidential basis for the designation. Unlike OFAC, OFSI's process does not formally involve other government agencies in a systematic inter-agency consultation, though intelligence considerations can still influence the outcome through the ministerial review stage.
Speed also differs. OFSI operates under statutory time obligations that do not formally apply to OFAC. While those obligations do not guarantee rapid removal, they impose a structural discipline on the process that the OFAC pathway, being entirely executive and discretionary, does not share.
Where do the evidentiary standards diverge most sharply?
The sharpest practical divergence between OFAC and OFSI delisting sits in the treatment of evidence and the weight given to the original designation rationale. Under OFAC, the agency holds classified and law-enforcement-sensitive information that informed the designation, and the petitioner typically cannot access or directly contest that material. The petitioner works in the dark to some extent, constructing an evidence package around the publicly stated basis – which is itself often formulaic – while trying to anticipate the underlying intelligence picture.
Under OFSI, the designated party benefits from greater procedural transparency at the appeal stage. A UK court reviewing a designation can engage with the question of whether the statutory criteria are satisfied in a way that a US district court, reviewing an OFAC designation under the highly deferential administrative-law standard, typically cannot. That difference in judicial review intensity is not marginal. It shapes the entire strategy. A petitioner who cannot shift the OFAC designation through administrative channels faces a very steep hill if they choose to litigate in US federal court. The deferential standard afforded to the executive in national-security adjacent measures is well established and difficult to overcome.
What does this mean in practice? It means that the OFAC petition must be built to persuade the agency itself, because a court challenge is rarely the realistic backstop. The OFSI process, by contrast, must be built with the court as a live option – because the court, if reached, will actually engage substantively with the designation evidence.
There is a further divergence on the question of ongoing designation review. OFAC has no general statutory obligation to periodically review designations. An SDN can remain listed indefinitely unless the designated party takes active steps to pursue removal. OFSI, under the UK statutory architecture, has obligations around periodic review. That structural difference can matter for a long-standing designation where the facts on the ground have shifted considerably since the original listing.
How does the 50 percent rule interact with delisting strategy?
The 50 percent rule (OFAC's rule treating entities owned 50 percent or more in the aggregate by blocked persons as themselves blocked, even if not separately listed) intersects with the delisting question in ways that practitioners must address explicitly. If the designated individual is the person whose listing causes entities to be blocked through ownership, removing that person from the SDN List will, as a consequence, unblock the entities – provided no other listed person independently reaches the ownership threshold. That cascade effect means the scope of the delisting petition extends beyond the named individual to every entity caught downstream through the ownership chain.
OFSI and the EU apply an ownership and control test (the UK and EU test for whether a non-listed entity is caught through a listed person) that extends the analysis beyond a simple 50 percent threshold to include control by other means – voting rights, contractual rights, board composition, and the ability to direct or veto decisions. This broader test can catch entities that OFAC's mechanical ownership rule would not. Conversely, OFAC's rule can catch entities that a pure control analysis under OFSI or EU methodology might treat as outside scope.
For a business managing parallel designations across regimes, this divergence has a direct consequence. Delisting the individual from the SDN List does not automatically unblock the entities under OFSI or EU rules if the individual retains control by other means over those entities, even after their removal from the respective lists. The analysis must be run independently for each regime. Do not assume that success in Washington automatically translates to relief in London or Brussels.
We regularly advise clients on exactly this scenario – mapping the downstream entity exposure across regimes before the petition is filed, so that the delisting strategy is designed to achieve full unblocking rather than partial relief.
What are the principal risk flags in a dual delisting matter?
Practitioners running a dual OFAC and OFSI petition encounter a set of recurring risk factors that determine whether the process succeeds or stalls. Identifying them early – before the petition is filed – is the highest-value work in the engagement.
- Document asymmetry: the evidence that persuades OFAC may not be the evidence that satisfies OFSI, and vice versa. A compliance history framed around US programme criteria may fail to engage the UK statutory test. The two submissions must be drafted separately, though drawn from a common evidential base.
- Timing misalignment: OFAC and OFSI operate on different procedural timelines. Filing both petitions simultaneously can create a situation where one regime reaches a conclusion – positive or negative – while the other is mid-process. A negative OFAC outcome reached while the OFSI process is running can colour the UK decision-maker's assessment, even if the two designation bases are technically independent.
- Third-party witnesses and document custodians: where supporting evidence requires statements from parties located in the United States, those parties may be unwilling to assist with an OFSI submission, and vice versa. Practical evidence-gathering limitations can shape the strength of the package more than the legal arguments.
- Public disclosure risk: OFAC's petition process is not public; neither is OFSI's reassessment. However, a judicial-review application or a court appeal in the UK becomes a matter of public record. A petitioner who is sensitive to reputational exposure must factor in the difference in public visibility between the two routes.
- Programme-specific criteria: different OFAC programmes operate under different designation criteria, and the relevant executive order language controls. A petition that correctly addresses the criteria under one programme would be drafted differently for another. OFSI's thematic regulations similarly differ in their criteria. Mixing the legal analysis across regimes or programmes is a consistent source of error.
If a transaction has already been flagged, or a delisting filing has been refused, an early review with counsel can preserve options that narrow with time. Contact Calder & Vance at info@caldervance.com for a confidential initial assessment.
How does EU delisting practice compare, and why does it matter for OFAC and OFSI petitioners?
A practitioner advising a dual-designated party cannot ignore the EU dimension, even where the client's primary concern is OFAC and OFSI. EU designations are made by Council Decision and implemented by Council Regulation. The challenge route – an annulment action before the EU General Court – is structurally different from both the OFAC and OFSI processes. It is judicial from the outset, rather than administrative-first-judicial-second. The petitioner files proceedings before the General Court directly, and the procedural rules of EU litigation govern the exchange of evidence and argument.
The EU General Court has, over time, developed a substantial body of practice on the standard of review applicable to restrictive measures. That case law shapes what evidence the petitioner needs to present. A persuasive OFAC petition and a persuasive General Court pleading draw on different legal techniques, even when the underlying facts are identical.
Why does this matter for OFAC and OFSI petitioners specifically? Because a business challenging designations in three jurisdictions simultaneously must prioritise scarce resources. A success at the EU level can sometimes provide supporting material for the OFAC petition – the General Court's factual findings, for example, may be useful narrative evidence even though they have no binding force on OFAC. Conversely, a concession made in the OFAC petition could be cited adversely in EU proceedings. Cross-regime consistency of the factual narrative is non-negotiable. In our cross-border practice, we maintain a single master facts chronology from which all three submissions are derived, updated as each regime advances.
For businesses also managing Australian autonomous-sanctions designations, the evidence-package methodology shares structural similarities with the UK approach. Our work on delisting evidence packages in the Australian regime informs the comparative methodology we bring to dual OFAC/OFSI matters.
A common objection: "the designation is too recent to challenge"
A misconception we encounter regularly is that a designation should be left to settle before a petition is filed – that challenging too early wastes resources or is somehow procedurally premature. This is not accurate, and acting on this assumption can cause material harm.
Both OFAC and OFSI permit petitions from the moment of designation. There is no mandatory waiting period. The longer a designation stands, the more damage accumulates to the designated party's business relationships, banking access, and reputational position. Asset freezes do not pause; contracts cannot be performed; correspondent banking lines are cut. Delay in filing the petition extends every one of these consequences.
There is a second reason why early filing is often the correct strategy: the designated party's recollection of the facts, access to contemporaneous documents, and ability to locate supporting witnesses are all strongest immediately after designation. Evidence degrades. Key witnesses become unavailable. Documents that could demonstrate material change of circumstances may be overwritten or discarded if the business is in operational distress.
This does not mean filing an underprepared petition is wise – a weak petition can harden the regulator's position and is more difficult to overcome in a subsequent round. The right answer is not "wait" or "file immediately without preparation." It is to begin preparation immediately, assess readiness on an expedited basis, and file as soon as the package is capable of carrying the argument. In our experience, the preparation window for a well-constructed OFAC petition, run in parallel with an OFSI reassessment request, is typically measured in weeks, not months – provided the facts are clear and the documentary base is accessible.
Related practices
- Delisting evidence packages – Australian autonomous-sanctions regime – evidence-package construction for Australian DFAT designation challenges
- OFSI vs EU delisting analysis – comparative analysis of UK and EU reassessment and annulment routes
- OFSI vs EU delisting analysis – further developments – updated analysis of procedural divergences between OFSI and the EU General Court