What Is a CBA?

Short answer

• A collective bargaining agreement (CBA) is a written contract negotiated between an employer and a labor union representing a defined group of employees. It sets wages, hours, benefits, and other employment terms and conditions for everyone in that group, whether or not each individual worker is a union member. In short, a CBA is the workplace rulebook that results from collective bargaining: the union and the employer negotiate as groups, put the agreed terms in writing, and are bound by those terms for the life of the contract. This article explains what a CBA is, who negotiates it, what it usually covers, how long it lasts, what happens when it expires, and how it differs from an individual employment contract and from a strike. It is general information only, not legal advice for any person's situation, and the details of any real CBA depend on its own wording and on the laws that apply to that workplace.

What a Collective Bargaining Agreement Is

Collective bargaining is the process in which a union negotiates with an employer for a group of workers, rather than each worker negotiating alone. The agreement that comes out of that process is the collective bargaining agreement. It is a contract, not a policy statement, a handbook summary, or an informal promise. Once the parties have agreed and completed the steps their own rules require, such as ratification where that step applies, the CBA governs the employment relationship for the covered workers until it expires or is replaced.

Think of a CBA as a set of signed house rules: what each side must do, what each side may not do, and how disagreements about the rules themselves will be handled. If a dispute arises about pay, scheduling, discipline, or another covered topic, the CBA is usually the first place to look, because the answer is often written there in specific terms.

A CBA does not replace other laws that apply at work. Federal and state employment laws, health and safety rules, and anti discrimination protections still apply. A CBA cannot lawfully require conduct the law forbids, and cannot take away rights the law guarantees.

Who the Parties Are

There are two formal parties to a CBA: the employer and the union. The employer side may be a single company, a school district, a hospital system, or another organization that employs the covered workers; in some industries, several employers bargain together through an association. The employer is normally represented by managers, human resources staff, labor relations specialists, or outside negotiators with authority to make proposals and, within limits, to reach agreement.

The union side is the labor organization that represents the covered workers. Under the National Labor Relations Act (NLRA), which governs most private sector workplaces in the United States, a union chosen as the representative acts as the exclusive representative for the bargaining unit. That means the employer bargains with the union, not separately with individual workers in the unit, about the mandatory subjects of bargaining. The union team usually includes elected officers, staff representatives, and rank and file members who work in the covered jobs.

The bargaining unit is the defined group of employees covered by the agreement. It might include all full time and regular part time production workers at one plant, all teachers in a school district, or all nurses in a hospital, and does not normally include supervisors or managers. Only workers in the unit are covered by that CBA. Covered workers, sometimes called unit employees, receive its protections and are subject to its obligations even if they choose not to join the union, where the law and the contract allow that arrangement. Membership and coverage are therefore related but not identical, and the rules about dues and fees depend on federal law, state law, and the contract itself.

The Law Behind a CBA in the Private Sector

In the United States, the main federal law behind most private sector CBAs is the National Labor Relations Act of 1935. The National Labor Relations Board (NLRB) states that Congress passed the NLRA in 1935 and that it is United States policy to encourage collective bargaining by protecting workers’ freedom of association. The NLRB is the independent federal agency created to enforce the NLRA, handling union elections and investigating unfair labor practice charges.

The NLRA applies to most private sector employers, including manufacturers, retailers, private universities, and health care facilities, according to the NLRB’s frequently asked questions page. It does not apply to federal, state, or local governments, to employers who employ only agricultural workers, or to employers subject to the Railway Labor Act, which covers interstate railroads and airlines. Most private sector employees are covered, while government employees, agricultural laborers, independent contractors, and supervisors, with limited exceptions, are not. Those excluded groups may have bargaining rights under other federal or state laws, but the rules can differ sharply.

Public sector CBAs are a separate category, usually governed by state law or, for federal workers, by federal sector labor law. The basic idea is similar, but the scope of bargaining, the right to strike, and dispute procedures can differ sharply. This article focuses mainly on the private sector NLRA model.

How a CBA Is Negotiated

Negotiation usually follows a recognizable sequence, although timing, tone, and complexity vary widely.

Preparation comes first. The union often surveys members and ranks priorities such as pay, health insurance costs, staffing, scheduling, safety, or retirement benefits, while the employer reviews payroll data, benefit costs, staffing needs, and financial projections. Both sides may review economic data, including Bureau of Labor Statistics data.

Next, the parties exchange opening proposals, often ambitious, because each side starts by stating what it would like and leaves room to compromise. They then meet in sessions to discuss proposals article by article, agreeing on some quickly, setting others aside, and returning to difficult topics later. Negotiators may caucus, each team meeting privately before returning to the joint session, and may exchange written counterproposals and ask for information relevant to bargaining.

Throughout this process, the NLRA requires both sides to bargain in good faith. The NLRB explains that after employees choose a union as their bargaining representative, the employer and union must meet at reasonable times to bargain in good faith about wages, hours, vacation time, insurance, safety practices, and other mandatory subjects. Good faith does not require either party to agree to a specific proposal or to make a concession, but does require an open mind, a sincere desire to reach agreement, and a sincere effort to find common ground, judged by the totality of the circumstances. Conduct suggesting bad faith, sometimes called surface bargaining, can include refusing to meet at reasonable times, sending a representative without authority to make decisions, making unilateral changes without bargaining, or bypassing the union and dealing directly with covered employees.

When negotiators agree on a provision, they often mark it tentatively agreed, subject to agreement on the contract as a whole. When all articles are tentatively agreed, the teams have a tentative agreement for the full contract. In many unions, that tentative agreement must then be ratified: presented to the covered members for a vote. If members approve it, the agreement is signed and becomes the CBA; if they reject it, bargaining usually resumes, guided by feedback about why it was rejected. Once signed, the CBA takes effect on the date the contract states, is normally distributed to covered workers, and workers who cannot obtain a copy should ask a union steward or representative.

What a CBA Typically Covers

No two CBAs are identical, but most cover familiar topics. Wages are often the most closely read part. A contract may set starting rates, pay scales by job classification, step increases based on experience or tenure, shift differentials for evening or night work, overtime rates, and rules for premium pay on weekends or holidays, general wage increases over the life of the contract, and cost of living adjustments tied to an inflation measure.

Hours, scheduling, and overtime provisions define the normal workday and workweek, rest periods, meal periods, and how extra hours are assigned. A CBA might require advance notice of schedule changes, limit mandatory overtime, or give senior workers first choice of shifts or vacation. Benefits articles commonly cover health insurance, retirement plans, paid leave, sick leave, holidays, and disability coverage, including premium sharing and eligibility; detailed plan terms often sit in separate plan documents.

Seniority is the principle that length of service gives a worker priority in decisions. A CBA may use seniority to decide layoff order, recall after layoff, promotion or transfer opportunities, shift selection, and vacation scheduling, and some contracts combine seniority with qualifications, so seniority governs among workers who meet the stated qualifications for a job.

Many CBAs replace at will employment for covered workers with a just cause standard for discipline and discharge. At will employment generally means an employer may end employment for any lawful reason. Under a just cause clause, the employer must have a fair and sufficient reason and usually follow progressive discipline: a verbal warning, a written warning, a suspension, and only then discharge for repeated or serious misconduct. Just cause does not mean a worker can never be disciplined or fired; it means the employer must justify the action under the contract, and the worker can challenge it through the grievance procedure.

The grievance procedure is the CBA’s internal system for resolving disputes about contract interpretation or application. A worker, usually with a union steward, raises the issue with a supervisor; if it is not resolved, the grievance moves to higher levels, with written records at each step. If the parties still cannot agree, many contracts provide for arbitration, in which a neutral arbitrator hears both sides and issues a normally final and binding decision.

Safety provisions may require safe working conditions, protective equipment, and hazard training, working alongside legal safety duties rather than replacing them. Management rights clauses reserve decisions to the employer, while the NLRA still requires bargaining about the effects of some managerial decisions on unit employees.

Some CBAs include union security provisions, concerning whether covered workers must join the union or pay fees as a condition of employment. The NLRB notes that 27 states have banned such agreements by passing so called right to work laws, as stated on the NLRB page accessed for this article. In those states, each employee decides whether to join and pay dues, even though all workers in the unit are protected by the CBA.

Many CBAs include a no strike clause, in which the union agrees not to strike during the contract term, and a no lockout clause, in which the employer agrees not to lock workers out during the same period. These clauses are linked to grievance arbitration and normally apply only during the contract term. CBAs also commonly cover layoff and recall, subcontracting, nondiscrimination, leave, training, and reopeners for specific topics such as wages, before the full contract expires.

Mandatory, Permissive, and Illegal Subjects

Labor law divides bargaining subjects into three categories. Mandatory subjects are topics the parties must bargain about if either side raises them: wages, hours, and other terms and conditions of employment, including vacation time, insurance, and safety practices, as the NLRB explains. A party that refuses to bargain over a mandatory subject may commit an unfair labor practice.

Permissive subjects, sometimes called voluntary subjects, are topics the parties may discuss if both sides agree, but neither side can insist on them to the point of deadlock. Illegal subjects cannot be included in a CBA even if both sides want them, because they would violate the law, such as provisions requiring discrimination prohibited by law. If a proposal concerns an illegal subject, the parties should remove it rather than bargain it into the contract.

How Long a CBA Lasts

CBA duration varies: some contracts run for one year, others for two or three years, and some run longer. Secondary sources consulted for background report different common ranges: some describe one to three years as typical, others three to five years as common. That variation is itself informative: no single national duration applies to every CBA, and readers should not assume a standard length without checking the contract in question. Duration is often a trade off: a longer contract gives predictability, while a shorter contract gives more frequent adjustment to changing prices, labor markets, or business conditions. The contract itself states its effective and expiration dates, and those dates matter for notice deadlines and for whether a no strike clause is still in force.

What Happens When a CBA Expires

Expiry does not normally mean all workplace rules vanish overnight, but it does change the legal position of both sides. The pattern below is the general NLRA pattern; health care institutions have different notice timelines under the NLRA, and public sector contracts follow their own laws.

A party wishing to terminate or modify a CBA must notify the other party in writing 60 days before the expiration date, or 60 days before the proposed termination or modification, and must offer to meet and confer to negotiate a new contract, according to the NLRB. The party must also notify the Federal Mediation and Conciliation Service within 30 days after that notice, and simultaneously any state or territorial mediation agency established for that purpose. These notice rules are strictly applied in NLRB practice.

The NLRB states that the parties’ obligations do not end when the contract expires: they must bargain in good faith for a successor contract, or for termination of the agreement, while terms of the expired contract continue. In practice, the employer generally may not make unilateral changes to mandatory subjects, such as wages or hours, without first bargaining, even after expiration.

Not every provision survives expiry alike. Terms and conditions of employment, such as wage rates and hours, generally continue by force of law pending successor bargaining, while some contract mechanisms may not. Arbitration and no strike provisions are commonly viewed as linked to the contract term: when the contract expires, workers may regain the ability to strike, and the employer may no longer be obligated to arbitrate disputes under the expired contract. Dues checkoff and union security provisions have been the subject of changing NLRB precedent, so their treatment after expiry should not be assumed without checking current Board law and contract wording.

The NLRB also states that the parties must continue in full force and effect, without resorting to strike or lockout, all the terms and conditions of the existing contract for 60 days after notice is given or until its expiration date, whichever occurs later. After that period, subject to the contract and the law, a union may strike and an employer may lock out workers as lawful pressure tactics, unless a different rule applies.

If the parties bargain in good faith but reach a genuine deadlock, the law calls that impasse. The NLRB explains that if, after sufficient good faith efforts, no agreement can be reached, the employer may declare impasse and implement the last offer presented to the union. The union may dispute that true impasse was reached, file an unfair labor practice charge, and the NLRB will decide based on the history of negotiations. If the Board finds impasse was not reached, it may order the employer back to the table and, in an extreme case, seek a federal court order to force bargaining.

When talks stall, the Federal Mediation and Conciliation Service can mediate, helping the parties communicate without imposing a settlement.

A CBA Compared with an Individual Employment Contract

An individual employment contract is negotiated between one worker and one employer. It may cover salary, job title, start date, bonuses, or severance terms for that worker alone, and is normally changed only by agreement between that worker and the employer.

A CBA is negotiated collectively. It covers a whole bargaining unit under one set of rules, and is changed through collective bargaining, not through separate deals with individual workers in the unit. An employer generally may not bypass the union and offer different terms to individual unit workers on mandatory subjects. Workers in a unit therefore gain uniformity and collective strength, but give up the ability to negotiate separate terms on covered subjects.

A third category is at will employment without any contract. Many workers have no written contract and no CBA, and their employer may change pay, hours, or duties within legal limits. A CBA moves covered workers out of that category for the topics it addresses.

A CBA Compared with a Strike

A CBA and a strike are often mentioned together, but they are different things. A CBA is an agreement: a written contract that sets terms and conditions of employment and stabilizes the workplace for a defined period. A strike is a work stoppage: a collective refusal to work, used as economic pressure to support bargaining demands, protest an unfair labor practice, or pursue another lawful purpose. A strike is an action, not a document; it may occur during bargaining for a new CBA or after a CBA has expired, but it is not itself a CBA.

The relationship is close but distinct. A strike may help bring about a CBA by pressuring an employer to agree to terms. A no strike clause in a CBA may prevent a strike during the contract term in exchange for binding arbitration. Expiry of a CBA may restore the ability to strike, subject to notice rules and other legal limits. A separate article, What Is a Strike, covers strikes in detail. Keep the distinction clear: the CBA is the agreement, the strike is the stoppage. A lockout is the employer’s counterpart to a strike: the employer prevents employees from working to exert economic pressure. Like a strike, a lockout is a pressure tactic, not a contract.

How Common Are CBAs?

The Bureau of Labor Statistics provides the most widely cited national picture of union coverage, although its figures measure union membership and representation rather than counting CBAs. In its Union Members release for 2025, published on February 18, 2026, the Bureau reported that the union membership rate, the percent of wage and salary workers who were members of unions, was 10.0 percent in 2025, and that 14.7 million wage and salary workers belonged to unions.

The same release reported that 16.5 million wage and salary workers were represented by a union in 2025, or 11.2 percent. That group includes union members (14.7 million) and workers who report no union affiliation but whose jobs are covered by a union contract (1.8 million), the closest national proxy for CBA coverage in the Bureau’s data. Coverage varies sharply by sector: the public sector rate was 32.9 percent in 2025, more than five times higher than the private sector rate of 5.9 percent. Among full time workers, union members had median usual weekly earnings of $1,404, compared with $1,174 for nonunion workers. The Bureau cautions that those differences also reflect occupation, industry, age, firm size, and region, so the gap should not be read as proof that a CBA alone causes any particular pay difference. The Bureau also cautions that the 2025 annual estimates are 11-month averages that exclude October 2025, because the Current Population Survey for that month was not collected during the federal government shutdown, and are therefore not strictly comparable with annual averages for other years.

Frequently Asked Questions

What does CBA stand for?

CBA stands for collective bargaining agreement. In labor relations, it means the written contract negotiated between an employer and a union representing employees. The same letters can mean other things in other fields, such as cost benefit analysis in economics, so context matters. When the topic is unions, workplaces, pay, and employment terms, CBA almost always means collective bargaining agreement.

Who negotiates a CBA?

A CBA is negotiated by the employer, or an employer association, on one side and the union that represents the covered workers on the other side. Under the NLRA, the union acts as the exclusive representative for the bargaining unit, so the employer bargains with the union about mandatory subjects rather than negotiating separate terms with individual unit workers.

Do I have to join the union to be covered by a CBA?

Not necessarily. In many workplaces, all workers in the bargaining unit are covered, whether or not they join the union. Whether you must join or pay fees depends on federal law, state law, including applicable right to work laws, and the contract itself. The NLRB page accessed for this article states that 27 states have banned union security agreements through right to work laws. Check the rules for your own state and contract.

How long does a CBA last?

It depends on the contract: some CBAs last one year, others two or three years, and some longer. The contract states its effective and expiration dates. Because secondary sources report different common ranges, no single typical duration can be stated safely for every CBA.

What happens if my CBA expires and no new agreement is reached?

The duty to bargain for a successor agreement continues, and many terms of the expired contract continue while bargaining proceeds, subject to particular provisions. The parties must follow NLRA notice requirements: written notice 60 days before expiration or proposed termination or modification, and notice to the Federal Mediation and Conciliation Service within 30 days after that notice, with different timelines for health care institutions. After the required status quo period, a strike or lockout may become a lawful pressure tactic, subject to the law and any interim agreement.

What is a grievance under a CBA?

A grievance is a formal complaint that the employer has violated the CBA, for example, misapplying a pay, scheduling, or discipline rule. The grievance procedure sets out steps for raising the complaint, first with a supervisor and then at higher levels, and many contracts end with binding arbitration if the parties cannot resolve it themselves. Deadlines are important and often short.

Can a CBA be changed during its term?

A CBA can be changed during its term only as the contract itself allows, for example through a reopener clause for a specific topic, or by mutual written agreement, such as a side letter. An employer generally may not change mandatory subjects unilaterally during the term without bargaining. Mid term changes not properly agreed can lead to grievances or unfair labor practice charges.

Is a CBA the same as an employment contract?

No. An individual employment contract covers one worker and is negotiated between that worker and the employer. A CBA covers a whole bargaining unit, is negotiated collectively through the union, and applies uniformly to covered workers. An individual worker in a unit generally cannot negotiate separate terms on mandatory subjects covered by the CBA.

Does a CBA protect me if I am fired?

A CBA with a just cause clause and a grievance procedure gives a covered worker more protection than at will employment, because the employer must show a fair reason and follow the contract process, and the worker can challenge it through a grievance and, where provided, arbitration. It does not make dismissal impossible: serious misconduct, repeated violations after progressive discipline, or a lawful layoff under the contract can still end employment.

Where can I find my CBA?

Ask your union steward or representative, or your employer’s human resources or labor relations office, for a copy of the current agreement and side letters. Members of federal sector unions have a right of access to the agreement their union negotiates, under Department of Labor guidance. Keep your copy with the effective and expiration dates marked.

Keep reading: What Is a Strike?

Sources & references

• National Labor Relations Board. Employer/Union Rights and Obligations. Accessed October 30, 2026. https://www.nlrb.gov/about-nlrb/rights-we-protect/your-rights/employer-union-rights-and-obligations
• National Labor Relations Board. The Law. Accessed October 30, 2026. https://www.nlrb.gov/about-nlrb/rights-we-protect/the-law
• National Labor Relations Board. Frequently Asked Questions. Accessed October 30, 2026. https://www.nlrb.gov/resources/faq/nlrb
• US Bureau of Labor Statistics. Union Members, 2025. News release USDL-26-0229, February 18, 2026. Accessed October 30, 2026. https://www.bls.gov/news.release/union2.nr0.htm
• US Department of Labor, Worker.gov. Addressing wages and working conditions. Accessed October 30, 2026. https://www.worker.gov/wages-and-working-conditions/
• US Department of Labor, Office of Labor-Management Standards. Bill of Rights of Members of Federal Sector Unions. Accessed October 30, 2026. https://www.dol.gov/agencies/olms/compliance-assistance/bill-of-rights