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Unions, strikes and collective bargaining in Uruguay

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

Union membership and activity are strongly protected: anti union dismissals are void with reinstatement and back pay, dues are checked off with the worker's written consent, and unions may post notices and distribute material at the workplace. Bargaining happens at sector level through Wage Councils and bipartite agreements, which bind all employers in the sector once registered and published, and at company level; agreements last as the parties agree, and since 2023 expired agreements no longer extend automatically. The State guarantees peaceful strikes together with non strikers' right to work and management's right to enter, pickets that block free movement are illegitimate, and agreements carry a peace obligation on the issues agreed.

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; conversions are for orientation only.

Key facts

Union dues withholding	With the worker's prior written consent Ley Nº 17.940 art. 6, as of 2026-10-27 · in force
Special protection for union founders after the union is created	12 monthsLey Nº 17.940 art. 2, as of 2026-10-27 · in force
Automatic extension of expired collective agreements	Repealed in 2023; parties set extension Ley Nº 20.145 art. 4, as of 2026-10-27 · in force
Members of the Superior Tripartite Council (6 per side)	18 membersLey Nº 18.566 art. 8, as of 2026-10-27 · in force
Maximum labor fine per worker affected (doubled on repeat)	150 days' wagesLey Nº 15.903 art. 289, as of 2026-10-27 · in force
Maximum closure of an establishment	6 daysLey Nº 15.903 art. 289, as of 2026-10-27 · in force

The rule

1. Any discrimination aimed at undermining union freedom in employment or hiring is absolutely null, in particular conditioning a job on not joining a union or dismissing or harming a worker for union membership or activity, including workers organizing a union.Ley Nº 17.940 (Union freedom), Art. 1, 2006-01-02 official text · verified 2026-10-27

2. Reinstatement claims follow the extraordinary process; union officers, delegates in bipartite or tripartite bodies, bargaining representatives and union founders (until one year after creation) get special protection under the fast amparo procedure. A judgment finding a violation orders effective reinstatement and payment of all wages during the proceedings.Ley Nº 17.940, Art. 2 and 3, 2006-01-02 official text · verified 2026-10-27

3. Workers have paid union leave, regulated by the Wage Council or collective agreement. Members may have their dues withheld from pay with prior written consent, the amount being set by the union. Union representatives may post notices in agreed places and distribute union material without disrupting operations.Ley Nº 17.940, Art. 4, 6 and 8, 2006-01-02 official text · verified 2026-10-27

4. Employers and unions must bargain in good faith, give negotiators the necessary mandate, justify their positions and exchange the information needed, with confidentiality duties; organizations must have legal personality for these purposes. Where several worker organizations claim legitimacy and do not agree, the most representative one bargains, by seniority, continuity, independence and membership.Ley Nº 18.566 as amended by Ley Nº 20.145, Ley 18.566 art. 4 and 14, 2023-05-17 official text · verified 2026-10-27 · changed: Ley Nº 20.145 (17 May 2023) added the legal personality requirement to art. 4 and reworded art. 14.

5. Bargaining may take place at sector, company, establishment or any other level; lower levels cannot reduce higher level minimums unless the Wage Council allows it. Collective agreements cannot be modified to the workers' detriment by individual contracts, and a sector agreement signed by the most representative organizations binds the whole level once registered and published. Duration, extension and termination are set by the parties; the former rule keeping all clauses in force after expiry until replaced was repealed in 2023.Ley Nº 18.566; Ley Nº 20.145, Ley 18.566 art. 15, 16 and 17; Ley 20.145 art. 4, 2023-05-17 official text · verified 2026-10-27

6. During an agreement the parties must not take actions contrary to it or apply industrial action over the agreed issues (national union actions are excluded); agreements must include dispute procedures, and breach without such a procedure can lead to court ordered termination of the agreement. The MTSS provides mediation and conciliation in collective disputes, and parties may use the Wage Council for conciliation.Ley Nº 18.566, Art. 18, 19, 20 and 21, 2009-09-11 official text · verified 2026-10-27

7. The State guarantees the peaceful exercise of the right to strike, the right of non strikers to enter and work, and management's right to enter the premises freely. Pickets that prevent free movement of people, goods or services in public spaces or private spaces of public use are illegitimate.Ley Nº 19.889 (Urgent Consideration Law), Art. 392 and 468, 2020-07-09 official text · verified 2026-10-27

8. Breaches of laws, decrees, Wage Council decisions and collective agreements controlled by the Labor Inspectorate are punished by warning (entry in the Registry of Labor Infringers), fines of 1 to 150 days' wages per worker affected (doubled for repeat offenders) or closure of up to six days. For breaches of ILO Conventions 87 and 98 on union freedom, the base is the total number of workers of the offender.
Example: An anti union breach at a company of 50 workers with an average daily wage of UYU 2,000 exposes it to fines between UYU 100,000 and UYU 15,000,000. / About US$2,487 to US$373,004.Ley Nº 15.903 as reworded by Ley Nº 16.736, Art. 289, 1996-01-05 official text · verified 2026-10-27

Level	Instrument	Binding effect	Norm
Sector (tripartite)	Wage Council decision	Whole activity group once registered and published	Ley 10.449 art. 5
Sector (bipartite)	Agreement by most representative organizations	Whole level once registered and published	Ley 18.566 art. 16
Company or establishment	Company agreement	Signatories; cannot lower sector minimums	Ley 18.566 art. 15
National	Superior Tripartite Council	Advises on minimum wage and group classification	Ley 18.566 art. 10

Bargaining levels

Worked example

Workers at a manufacturing plant form a union and the company dismisses its organizer two months later: the organizer can seek reinstatement under the amparo procedure, and if the court finds discrimination the company must reinstate and pay all wages for the period, besides any Labor Inspectorate fine computed on its total workforce.
A logistics company signs a two year agreement with its union on shift premiums; during those two years the union cannot strike over shift premiums, but can join a national general strike called by the union confederation.

Step by step

1. Identify the Wage Council group and the sector agreements that bind the company.
2. Set up a policy for union notices, information requests and dues check off on written consent.
3. Train managers that union activity cannot influence hiring, discipline or dismissal.
4. When bargaining, document mandates, positions and information exchanged.
5. Draft agreements with clear duration, extension, termination and dispute resolution clauses.

Common traps

Dismissing an organizer during a campaign is the highest risk move: reinstatement, back pay and fines based on the whole workforce.
Since 2023 an expired agreement stops applying unless it provides for extension; check the text rather than assuming continuity.
Company agreements cannot go below sector minimums unless the Wage Council allows it.
The peace obligation only covers issues agreed in the agreement, not national actions.

Sources

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