International Comity: How U.S. Courts Recognize Foreign Judgments

International comity is a discretionary doctrine under which a U.S. court chooses to respect the legislative, executive, or judicial acts of a foreign nation, weighing international duty against the rights of people under domestic legal protection. The U.S. Supreme Court set out that definition in 1895 and it still governs today.¹ In practice, U.S. courts apply comity in two situations: when someone asks them to enforce a judgment already issued by a foreign court, and when a foreign court is already handling a dispute that has also been filed in the United States. The analysis differs sharply in each.

How Courts Define Comity

The foundational statement comes from Hilton v. Guyot. The Court placed comity between two extremes: it is neither an absolute obligation demanded by international law nor a mere courtesy a judge can disregard at will.¹ It reflects a practical judgment about when respecting foreign sovereignty serves both international relations and domestic interests.

That voluntary character is what separates comity from the full faith and credit obligations binding U.S. states to honor each other’s judgments. No constitutional provision forces a U.S. court to enforce a judgment from France, Brazil, or Japan. The judge decides, weighing the foreign country’s legal system, the fairness of the proceeding, and the domestic interests at stake.

Hilton is also the source of the reciprocity rule: the Court refused conclusive effect to a French judgment because France did not similarly honor American judgments. That rule has faded. After Erie Railroad Co. v. Tompkins in 1938, federal courts sitting in diversity apply the recognition law of the state where they sit, and most states dropped reciprocity in favor of asking whether the foreign trial was procedurally fair. Reciprocity remains a historical reference point rather than a live barrier in most U.S. jurisdictions.

Enforcing a Foreign Money Judgment

The main mechanism for recognizing a foreign judgment is the Uniform Foreign-Country Money Judgments Recognition Act. The original version dates to 1962 and was updated in 2005; most states have adopted one or the other. The Act replaces open-ended common-law analysis with a defined list of grounds for granting or denying recognition.²

The Act is narrower than it sounds. It covers only foreign-country money judgments. It does not cover judgments for taxes, fines, or other penalties, and it does not reach domestic sister-state judgments, which travel under full faith and credit. The foreign judgment must be final, conclusive, and enforceable where it was rendered.

Filing a recognition petition requires authenticated copies of the foreign judgment and certified translations if the original is not in English. The U.S. Department of State charges $20 per document for apostille authentication, which certifies documents for use in countries party to the Hague Apostille Convention.³ State-level authentication fees are typically lower, often under $25 per document.

Mandatory Grounds for Refusing Recognition

Both versions of the Uniform Act list defects that force a court to refuse recognition. These are not weighable factors. If any one of them is present, the judgment cannot be enforced.²

The foreign judicial system did not provide impartial tribunals or procedures compatible with due process.
The foreign court lacked personal jurisdiction over the defendant. A defendant with no meaningful connection to the foreign country who did not consent to its jurisdiction is not bound by its judgment.
The foreign court lacked subject-matter jurisdiction over the type of dispute.

The common thread is that no matter how legitimate the underlying claim, a judgment from an unfair process or a court without authority is not entitled to recognition.

Discretionary Grounds for Refusing Recognition

Beyond the mandatory bars, courts may refuse recognition on several other grounds. Here the judge weighs the circumstances rather than applying an automatic rule.

Public policy. A judgment that violates domestic public policy can be rejected, though courts rarely invoke this exception unless the policy has constitutional dimensions. Ordinary differences in procedure or substantive law between the foreign country and the United States are not enough.²
Inadequate notice. If the defendant did not receive sufficient notice to mount a defense, recognition can be denied even when the foreign court had jurisdiction.
Fraud. A judgment obtained through fraud in the foreign proceeding may be denied recognition.
Conflicting judgments. If the foreign judgment conflicts with another final judgment, whether from a different foreign court or a U.S. court, recognition can be refused. There is no automatic rule favoring the earlier or later judgment.

The 2005 version added more discretionary grounds, including situations where the foreign proceeding violated a valid forum-selection clause or where the foreign court based jurisdiction on a theory the recognizing state considers unreasonable. The expansion gives courts additional tools to filter out judgments that were technically valid abroad but rest on jurisdictional theories U.S. law would reject.

Judgments U.S. Courts Will Not Enforce

Some foreign judgments are off the table regardless of how fair the underlying proceeding was. These exclusions sit outside the ordinary recognition analysis.

Tax Judgments and the Revenue Rule

Under the common-law revenue rule, which dates to the eighteenth century, U.S. courts will not enforce another country’s tax claims. Collecting taxes is an exercise of sovereign power, and enforcing a foreign tax judgment would effectively extend that foreign sovereign’s authority into U.S. territory. Courts also point to the practical difficulty of interpreting another country’s tax code. The Uniform Act itself carves out judgments for taxes.

Penal Judgments

Criminal fines and penalties face the same wall. A judgment obtained by a foreign government as part of a public enforcement action, rather than a private civil dispute, is treated as an exercise of sovereign power that does not travel across borders. The Hague Convention on the Recognition and Enforcement of Foreign Judgments reflects the same exclusion.

Defamation Judgments Under the SPEECH Act

The Securing the Protection of our Enduring and Established Constitutional Heritage Act, codified at 28 U.S.C. §§ 4101–4105, blocks recognition of foreign defamation judgments unless the foreign law provided at least as much protection for free speech as the First Amendment and the relevant state constitution.⁴ Congress passed the law to combat “libel tourism,” where plaintiffs filed defamation suits in plaintiff-friendly jurisdictions, such as English courts that put the burden of proving truth on the defendant, and then tried to collect in the United States.

The Act offers an alternative path: even if the foreign law offered weaker speech protection, the judgment can still be recognized if the defendant would have lost under U.S. constitutional standards anyway. The party seeking enforcement carries the burden on both tests. The statute also requires that the foreign court’s exercise of personal jurisdiction was consistent with U.S. due process, and it adds specific protection for interactive computer service providers tied to Section 230 of the Communications Decency Act. Defendants sued in state court on a foreign defamation judgment can remove the case to federal court regardless of the amount in controversy, and anyone facing such a judgment can file a preemptive declaratory judgment action in federal court before the plaintiff even tries to enforce.⁵⁶

How Service of Process Affects Recognition

A foreign judgment is only as enforceable as the notice the defendant received before it was entered. If service was defective, that alone can block recognition in the United States even when the foreign court otherwise had jurisdiction and ran a fair trial.

When the foreign court sits in a country that has ratified the Hague Convention on the Service Abroad of Judicial and Extrajudicial Documents in Civil or Commercial Matters, U.S. courts examine whether service complied with the Convention.⁷ Service through that framework is generally treated as adequate notice for recognition.

When the foreign country is not a party to the Convention, or service used a method the Convention does not address, U.S. courts apply a flexible standard: was the method reasonably calculated to give the defendant actual notice? Simply following the foreign country’s own service rules is not automatically enough if those rules fall short of what U.S. courts consider fundamentally fair.

Time Limits for Seeking Recognition

A party holding a foreign judgment cannot wait indefinitely. The 2005 version of the Uniform Act contains its own statute of limitations: an action for recognition must be filed within the earlier of the period during which the judgment remains effective in the foreign country or 15 years from the date it became effective there.

Not every state has adopted the 2005 version. The 1962 Act contains no limitations provision at all, so courts in states still using it apply whatever state statute governs actions on foreign judgments. The window varies. Some states allow as little as five years, others ten or more. The clock typically starts when the foreign judgment is entered, not when enforcement is first attempted in the United States. Anyone planning to enforce a foreign judgment domestically should check the recognition period in the specific state where enforcement will be sought.

When a Foreign Court Is Already Handling the Same Case

Comity also operates at the front end, when a U.S. court is asked to hear a dispute that a foreign court is already handling. The court may stay or dismiss its proceedings to avoid producing conflicting results.⁸ This is not about evaluating a foreign judgment. The court is deciding whether to exercise jurisdiction at all.

The Eleventh Circuit has described the analysis as weighing the domestic and foreign interests in the dispute to determine which forum is better positioned to resolve it. Judges typically look at:

Where the evidence and witnesses are located. If documents and people are concentrated abroad, litigating in the United States adds cost and delay.
Where the underlying events occurred. A contract performed in Belize involving Belizean parties and Belizean law points strongly toward Belizean courts.
National interest. Which country’s laws and policies are most directly affected by the outcome.
Enforceability. If any resulting judgment will have to be enforced abroad anyway, resolving the case there avoids a second layer of recognition proceedings.

A contractual choice-of-forum clause carries substantial weight. If the parties agreed in advance to litigate in a specific country, U.S. courts start with a strong presumption in favor of that agreement. The party trying to escape it bears a heavy burden to show that litigating in the chosen forum would effectively deny them their day in court.

Anti-Suit Injunctions

Sometimes the comity question runs in the opposite direction, with a U.S. court ordering a party to stop litigating in a foreign court. Anti-suit injunctions are among the most aggressive tools courts have, and federal circuits split on how freely to use them.

The D.C. Circuit’s decision in Laker Airways v. Sabena takes the conservative approach. An anti-suit injunction is justified only in narrow circumstances: to protect the U.S. court’s own jurisdiction from being undermined by the foreign proceeding, or to prevent a party from using the foreign proceeding to evade important U.S. public policies. The mere fact that two courts are hearing the same dispute between the same parties is not enough, and the possibility of inconsistent judgments does not outweigh the respect owed to independent foreign proceedings.⁹

Other circuits take a more permissive line, issuing anti-suit injunctions whenever there is duplication of parties and issues and the simultaneous proceedings would frustrate speedy resolution. The practical difference matters. In a conservative-approach circuit, you need to show the foreign proceeding is actively threatening U.S. jurisdiction or policy. In a liberal-approach circuit, duplicative proceedings and inefficiency may be enough.

The calculus shifts once a U.S. court has entered judgment on the merits. At that point, anti-suit injunctions face much less resistance, because the court is protecting a completed judgment rather than preemptively shutting down a parallel case. A party that loses in the United States and then runs to a foreign court to relitigate the same claim is engaging in exactly the kind of evasion anti-suit injunctions exist to prevent.

1
Justia. Hilton v. Guyot, 159 US 113 (1895)
2
Federal Judicial Center. Recognition and Enforcement of Foreign Judgments
3
U.S. Department of State. Requesting Authentication Services
4
Office of the Law Revision Counsel. 28 USC 4102 – Recognition of Foreign Defamation Judgments
5
Office of the Law Revision Counsel. 28 USC 4103 – Removal
6
Office of the Law Revision Counsel. 28 USC 4104 – Declaratory Judgments
7
Hague Conference on Private International Law. Convention on the Service Abroad of Judicial and Extrajudicial Documents in Civil or Commercial Matters
8
United States Court of Appeals for the Eleventh Circuit. GDG Acquisitions, LLC v. Government of Belize
9
Justia. Laker Airways Limited v. Sabena, Belgian World Airlines, 731 F2d 909