Cross-border enforcement
Enforcing a United Kingdom judgment in United States
There is no treaty between the United Kingdom and the United States for recognising civil judgments. The Hague 2019 Convention does not help. The US signed it in 2022 and never ratified it. Recognition runs through the law of the state where the debtor's assets sit, one state at a time. An arbitral award travels through the New York Convention and sits on firmer ground.
Applicable regime
The Hague 2019 Convention entered into force on 1 September 2023, but it binds only states that ratified it (N001). The United States signed on 2 March 2022 and has not ratified. The convention does not apply between the UK and the US (N170). The treaty route for judgments is closed, and no filing strategy reopens it.
What remains is domestic law. A UK judgment is recognised in the US through the private international law of the individual state where enforcement is sought. New York, Delaware and California each set their own terms, and the terms differ from state to state. This is a state-by-state exercise. The reverse direction, enforcing a US judgment in the United Kingdom, follows a separate regime.
No critical date under Article 16 of the convention needs calculating here (N012). That provision matters when both states were bound by the treaty at different times. It does not apply to a pair where one side never ratified.
An arbitral award sits outside this problem entirely. The New York Convention of 1958 covers arbitral awards regardless of the treaty gap on judgments (N016), which is why arbitration is the structurally sturdier route for anything not yet decided by a court (N172).
What the destination court will check
Admission runs on the recognising state's own law. New York allows a UK judgment creditor to move by summary judgment in lieu of complaint (N529), a faster procedural path than a full plenary trial once the judgment is accepted for review. California has not adopted the Uniform Enforcement of Foreign Judgments Act. Vermont is the only other state in that position (N532). Recognition in California follows a different statutory basis than the shortcut used elsewhere.
The substantive grounds a given state applies, including finality of the judgment, jurisdiction of the originating court, comity-based tests, and in some states a reciprocity requirement, are set by that state's own statute or case law. They are not uniform across the country. Whether the grounds are cumulative has to be checked for the specific state where the assets sit, not assumed from a national rule. The jurisdiction profile for the US tracks which state-level route applies once the state is known.
What will not go through
A filing built on the assumption that Hague 2019 applies will not go through. The US never ratified it, and that fact does not change with drafting (N170). Judgments that are not final, or that fall into categories excluded by the recognising state's own rules such as tax or penal judgments, also stay outside whatever route that state offers. The precise exclusions are set state by state and are not listed here.
The sharper trap sits with arbitral awards. US courts disagree on what happens once the three-year period after the award has passed. The Second Circuit's Seetransport line has allowed recognition of a judgment that itself confirmed the award. The D.C. Circuit's Commissions Import Export reasoning holds that the Federal Arbitration Act does not override a state's own limitation rules (N533). Which line applies depends on where enforcement is sought. Getting this wrong loses the award entirely. This is the practical core of a refusal to enforce classified under non-enforcement.
Documents
The United States is a party to the Hague Apostille Convention, in force there since 15 October 1981 (N413). A UK judgment or supporting document authenticated under the same convention needs an apostille before it can be filed in a US court. No consular chain is required for this pair. Translation requirements are set by the individual court and have to be confirmed for the specific filing before documents are prepared.
Timing
Filing fees in US courts are fixed amounts. They do not scale with the size of the claim (N557). This matters when comparing the cost of the US route against enforcement elsewhere.
For an arbitral award, the limitation period is three years, running from the date the award was made (N527). The circuit split described above means missing that window can end the claim entirely (N533). For a judgment, the period depends on the state. New York applies the lesser of the judgment's own validity period at origin or twenty years (N528). Delaware applies fifteen years where the country of origin sets no period (N530). California applies the lesser of the origin period or ten years (N531). None of these clocks pause because a treaty is missing. They run regardless. Limitation periods across jurisdictions sets out how these compare to other destinations.
If the primary route is closed
Where the judgment route is closed or too uncertain, arbitration is the stronger long-term fix. An award made under an arbitration clause moves through the New York Convention (N016) instead of through fifty separate state regimes, and the US never ratifying Hague 2019 does not affect it. This is a decision for the next contract, not for a dispute that has already reached judgment.
Recognising the same judgment in a third jurisdiction first, then pursuing assets located there, is sometimes possible. Whether a conduit route helps depends entirely on where the debtor's assets actually sit. It does not create US enforceability on its own. The routes into the United States generally and outbound enforcement from the United Kingdom set out the surrounding options. The reverse direction is a separate page.
What to do before filing
Check where the debtor's assets actually are before choosing a state to file in. A judgment recognised in the wrong state is a paper win. Where assets are liquid, including crypto holdings, the risk of dissipation before judgment is entered has to be weighed against the cost of acting. Set-off against frozen crypto accounts covers one variant of this problem.
Whether an interim measure is available to freeze assets meanwhile depends on the state and the facts of the case, not something to assume in advance. A first assessment under cross-border recognition and enforcement work maps which state route applies and whether the three-year arbitral clock has already started running. The firm does not work on a result-only fee, and its registration can be checked in the public register.