Cross-border enforcement

Enforcing a United States judgment in United Kingdom

No treaty governs enforcement of a US judgment in the UK. The Hague 2019 Judgments Convention is in force, but the US signed it and never ratified it, so it does not bind the two states. The working route is a fresh common law claim that treats the US judgment as a debt, argued on its merits rather than registered. A US arbitral award moves under a separate treaty and is not affected by this gap.

Applicable regime

Hague 2019 entered into force on 1 September 2023 and binds seven contracting parties [N001][N002]. The US signed it on 2 March 2022 but never ratified. It creates no obligation between the US and the UK [N011][N170]. Its critical-date rule only reaches proceedings started after the convention already links two states. That never triggers here, because the convention never links the US and the UK at all [N012]. The UK's Route 1 under Hague 2019 opens only for proceedings from 1 July 2025 against a contracting party [N120], and the US is not one. A second UK route, under Hague 2005, covers only exclusive choice-of-court judgments [N121]. Whether that instrument separately binds the relevant US court is a distinct check this note does not make. What remains is Route 4, a fresh common law claim treating the US judgment as a debt [N123], needing no reciprocity treaty. The UK also lost the Brussels Ia and Lugano regimes after Brexit [N124]. Refusal mechanics sit on a separate page, non-enforcement refusal mechanics. The reverse direction is a different page, enforcing a UK judgment in the United States. Other US-origin destinations are covered at enforcement routes out of the United States.

What the destination court will check

Because no treaty applies, a US judgment carries no automatic passport into the UK. It has to be pleaded as the basis of a new claim. The court examines the underlying judgment before treating it as a debt [N123]. The checks below are cumulative. Failing any one of them defeats the claim on the judgment.

• The US judgment must be final and for a fixed, ascertainable sum, not an order that leaves further proceedings open.
• The US court must have taken jurisdiction on a basis the UK's conflict rules recognise; jurisdiction resting solely on the state's own long-arm statute is not enough.
• The judgment must not have been obtained by fraud, on the court or on the defendant.
• Enforcing it must not conflict with UK public policy.
• The claim must be brought within whatever limitation period applies to it.

Which court within the UK hears this new claim, and how it is commenced, is set by the applicable procedural rules, not fixed in general terms here. The wider framework sits on the UK jurisdiction profile.

What will not go through

Two different kinds of failure show up here, one about the judgment's nature and one about the debtor's response.

• A judgment that is not yet final, still open to appeal in the US, does not qualify as a debt for a UK claim built on it.
• A judgment resting on a jurisdiction test the UK does not recognise is vulnerable to challenge at this stage, even if the US court applied its own law correctly.
• A US arbitral award is not the same instrument as a US court judgment. Treating the two as interchangeable is a common error, since the award travels under a different treaty with far wider reach [N016][N172].
• Whether a statutory registration scheme reaches the originating US court at all depends on lists tied to that specific pair of jurisdictions, and is not asserted here.

This layered exclusion is not unique to the US side. Enforcement routes into the UK from other origin states run into the same treaty gaps, filled by different instruments depending on where the judgment came from.

Documents

The UK is a party to the Hague Apostille Convention, in force since 24 January 1965, and accepts apostille certification for foreign public documents presented to its courts [N403]. Whether the issuing US authority certifies the judgment and supporting court records by apostille under the same convention is a document-specific check, not stated here. Translation is rarely the obstacle, since a US judgment is already in English. Any exhibit or underlying contract in another language should be checked against the actual record rather than assumed to need nothing.

Timing

Two limitation periods can apply, depending on how the claim is framed. A fresh action on a US judgment as a debt runs six years from the date the judgment became enforceable in the United States [N500]. A claim under a statutory registration scheme instead runs six years from the date of the judgment, or from the last appellate decision if it was appealed [N501]. That second measure is not the one that applies to a common law action, but it matters if a statutory route turns out to be available. If a US arbitral award is used instead of the court judgment, its own six-year limitation runs on the same basis as a claim on a simple contract [N502]. The six-year limit does not apply where the claim proceeds through bankruptcy or liquidation founded on the judgment debt [N503], which matters once the ordinary period has run.

Court fees for filing follow the money-claim scale, capped at £10,000 for claims valued above £200,000 [N543]. Enforcement steps such as a writ or warrant of control carry their own fixed fees [N544]. Limitation periods across other jurisdictions do not follow the same six-year pattern in every pair, so this figure should not be read across.

If the primary route is closed

Three paths sit outside the direct route. If the debtor holds assets in a jurisdiction that recognises US judgments more readily, recognising the judgment there first and reaching UK-based assets through that jurisdiction's own tools can move faster than starting in the UK. If the underlying dispute is still open, adding an arbitration clause to any settlement routes a future award through the New York Convention, a treaty with far broader reach than any judgment-recognition instrument available here [N016][N172]. Where the debtor is insolvent, a bankruptcy or liquidation claim founded on the judgment debt gets around the six-year limitation that would otherwise apply to a fresh action [N503].

None of these substitute for reading the underlying contract and the debtor's current asset picture first. Handling a settlement offer that follows an unpaid judgment covers a related decision many creditors face before any of this is filed.

What to do before filing

A fresh claim on a US judgment is only worth bringing if there is something to collect at the end of it. Trace where the debtor's assets sit today, not where they sat when the US judgment was entered. Assets move, and a debtor facing a new UK claim has had time to plan for it. Check for counterclaims or set-off arguments the debtor may raise. A claim that reopens the merits by the back door turns a six-year clock into a second dispute.

Whether an interim measure can hold assets in place while the claim is prepared is established from the case file, not assumed from the general rule. That review is what our cross-border recognition and enforcement service checks before any claim is filed. Fees here do not depend on the outcome, and the entity behind this page can be checked against the public registry linked in the footer.