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Investment arbitration and treaty protection in Uruguay

Last verified: 2026-10-27 · Status: Stable

Uruguay has been an ICSID Contracting State since 8 September 2000, and its investment law guarantees foreign investors the same admission and treatment as nationals. Access to investor State arbitration depends on the State's consent, usually in an investment treaty: the 2005 treaty with the United States, for example, requires 90 days' notice of intent, six months from the events and filing within three years, with a choice of ICSID, its Additional Facility or UNCITRAL rules. Uruguayan law treats any investment arbitration started by a foreign investor as international, and ICSID awards are enforced in all Contracting States as final local judgments.

USD figures use UYU 40.214 per US dollar, the BCU quotation for DLS. USA BILLETE on 26 October 2026, retrieved from the BCU quotations service on 27 October 2026. Amounts set in UR use UYU 1,940.77, the latest published UR value (September 2026, Decreto 229/026, IMPO values table); amounts in UI use UYU 6.6792 per UI (BCU, 27 October 2026). Conversions are rounded and for orientation only.

Key facts

ICSID Contracting State	Yes Ley 17.209, as of 2026-10-27 · in force
ICSID Convention in force for Uruguay	2000-09-08 dateLey 17.209, as of 2026-10-27 · in force
ICSID Convention signed by Uruguay	1992-05-28 dateLey 17.209, as of 2026-10-27 · in force
Equal treatment of foreign and national investors by law	Yes Ley 16.906 art. 2, as of 2026-10-27 · in force
US treaty: notice of intent before submitting a claim	90 daysLey 17.943, Treaty art. 24.2, as of 2026-10-27 · in force
US treaty: limitation period for claims	3 yearsLey 17.943, Treaty art. 26.1, as of 2026-10-27 · in force

The rule

1. Uruguay signed the ICSID Convention on 28 May 1992, Parliament approved it by Ley 17.209, the ratification was deposited on 9 August 2000 and it entered into force for Uruguay on 8 September 2000. ICSID jurisdiction requires written consent of the State and the investor; a locally incorporated company may be treated as a foreign national if, because of foreign control, the parties agree so. Each Contracting State must recognize an ICSID award as binding and enforce its pecuniary obligations as if it were a final judgment of its own courts, subject to its law on state immunity from execution.
Cost to do it: ICSID lodging and administrative fees follow ICSID's published schedule, plus arbitrators' fees and counsel.
Example: A Uruguayan subsidiary controlled by a Spanish group can bring an ICSID claim in its own name only if the consent instrument treats it as foreign controlled (art. 25.2 b). / A US$20,000,000 ICSID award against a Contracting State is enforceable in every Contracting State as a final local judgment as to its pecuniary obligations.Ley Nº 17.209 (approval of the ICSID Convention); ICSID Convention, Ley 17.209 single article; Convention art. 25, 54 and 55, 1999-09-24 official text · verified 2026-10-27

2. Foreign investors are admitted and treated on the same terms as Uruguayan investors; the promotion and protection of national and foreign investment is declared of national interest. Investments are admitted without prior authorization or registration.
Cost to do it: None to qualify for equal treatment; sector rules may require licences.
Example: A Brazilian investor buying a Uruguayan software company follows the same company and tax rules as a local buyer. / A US fund investing US$15,000,000 in Uruguayan real estate is not subject to a general foreign investment approval.Ley Nº 16.906 (Investment Promotion and Protection), art. 1, 2 and 3, 1998-01-07 official text · verified 2026-10-27

3. The Uruguay United States investment treaty, signed in Mar del Plata on 4 November 2005 and approved by Ley 17.943, requires the parties first to seek consultation and negotiation. At least 90 days before submitting a claim, the claimant must deliver a written notice of intent stating the treaty provisions, facts, law and approximate damages. A claim may be submitted once six months have passed since the events, under the ICSID Convention, the ICSID Additional Facility Rules, the UNCITRAL Arbitration Rules or other agreed rules, either for the investor's own loss or on behalf of a Uruguayan enterprise it owns or controls. No claim may be submitted more than three years after the claimant knew or should have known of the breach and the loss, and the claimant must waive the right to start or continue local court proceedings over the same measures.
Cost to do it: Treaty claims are expensive: counsel, experts and tribunal costs; the notice of intent itself has no fee.
Example: A US investor whose Uruguayan subsidiary's concession was cancelled can claim on the subsidiary's behalf under art. 24(1)(b). / A US investor alleging a US$10,000,000 (about UYU 402,140,000) expropriation must serve notice of intent at least 90 days before filing and file within three years of learning of the breach and loss.Ley Nº 17.943 (approval of the Uruguay United States investment treaty), Treaty art. 23, 24 and 26, 2006-01-04 official text · verified 2026-10-27

4. A concluded ICSID treaty case against Uruguay concerned tobacco control measures: three companies, two Swiss and one Uruguayan, filed under the 1988 Switzerland Uruguay investment treaty; the case was registered on 26 March 2010, the tribunal issued a decision on jurisdiction on 2 July 2013 and its award on 8 July 2016, and a rectification decision on 26 September 2016; the case is concluded.
Cost to do it: The case record shows the parties filed cost submissions in 2016; ICSID cases typically run several years.
Example: Public health and regulatory measures can be tested in treaty arbitration, but only through the consent given in the relevant treaty. / From registration in March 2010 to award in July 2016 took more than six years.ICSID Case No. ARB/10/7 (Switzerland Uruguay BIT 1988), ICSID case record, 2016-07-08 official text · verified 2026-10-27

5. Under the Código General del Proceso, investment arbitration started by foreign investors is always considered international, so the domestic arbitration rules apply only where treaties and the international arbitration law are silent and the seat is in Uruguay.
Cost to do it: No extra cost; it avoids the five day domestic annulment window for Uruguay seated investment cases.
Example: An investment arbitration seated in Montevideo under UNCITRAL rules is international, so Ley 19.636 applies to court support and annulment. / A foreign investor arbitrating a US$5,000,000 contract claim against a state enterprise in Montevideo benefits from the three month international annulment term.Código General del Proceso, art. 472.1 as reworded by Ley Nº 20.257, art. 472.1, 2024-04-25 official text · verified 2026-10-27

Route	Basis	Key condition	Source
ICSID Convention arbitration	ICSID (Ley 17.209) plus a treaty or contract consent	Both states party to ICSID for ICSID Convention rules	Convention art. 25
US treaty claim	Ley 17.943	90 day notice, six months from events, three year limit, waiver of local actions	Treaty art. 24 and 26
Contract arbitration seated in Uruguay	Contract clause; Ley 19.636	Always international for foreign investors	CGP art. 472.1
Local courts	CCA; Constitution art. 312	10 business day appeals, 90 day annulment claim	CCA art. 43 and 55

Investor State routes for a foreign investor in Uruguay

Worked example

A US company owns a Uruguayan logistics subsidiary whose operating permit is revoked. It first appeals locally within 10 business days to preserve domestic remedies (CCA art. 43). Considering a treaty claim, it reviews the US treaty: after consultations it serves a notice of intent at least 90 days before filing (art. 24.2), waits six months from the revocation, and must file within three years of learning of the breach and loss (art. 26.1); before filing it must waive local court actions over the same measure (art. 26.2). It chooses ICSID Convention arbitration, available because both the United States and Uruguay are Contracting States (art. 24.3 a).

Step by step

Check whether a treaty with the investor's home state, or a contract, gives Uruguay's consent to arbitration.
Map treaty preconditions: consultation, notice periods, waiting periods, limitation and waiver of local actions.
Preserve local administrative deadlines in parallel until the waiver is due (CCA art. 43 and 55).
Structure investments through entities covered by a treaty before a dispute arises.
Choose the forum: ICSID, Additional Facility or UNCITRAL as the treaty allows.

Common traps

Treaty claims require consent; ICSID membership alone does not give access.
The US treaty requires waiving local court proceedings on the same measures (art. 26.2).
Three year limitation runs from knowledge of breach and loss, not from the end of negotiations (art. 26.1).
Award enforcement against a State remains subject to state immunity from execution (ICSID Convention art. 55).

Sources

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