Bargaining Impasse: Definition, Employer Options, and Strike Rules

A bargaining impasse is the point in collective bargaining where the employer and union have reached a genuine deadlock and further talks would not change either side’s position. Reaching one temporarily suspends the duty to bargain, lets the employer put its last offer into effect on its own, and opens the door to strikes and lockouts. The catch is that the impasse has to be real. The National Labor Relations Board decides that question after the fact, and an employer that declares impasse prematurely will be ordered to undo every change and return to the table.

When an Impasse Actually Exists

The NLRB does not accept anyone’s word that negotiations are deadlocked. It applies a five-factor test from its 1967 decision in Taft Broadcasting Co., weighing all of the following together:¹

Bargaining history between the parties. A long track record of reaching agreements makes a sudden impasse claim look suspect.
The good faith of both sides at the table.
The length of negotiations relative to the complexity of the open issues. A two-session impasse on a multi-year contract covering thousands of workers is almost certainly premature.
The importance of the unresolved issues. Wages, health insurance, and pension contributions carry far more weight than minor scheduling disputes.
The contemporaneous understanding of the parties. At the moment impasse was declared, did both sides reasonably believe further meetings would be pointless?

No single factor decides the case, but the Board will not find impasse where the evidence shows one party was still actively trying to reach a deal. The party claiming impasse bears the burden of proving it.

Hard Bargaining vs. Surface Bargaining

The good faith factor trips up more employers than any other. Hard bargaining is legal. An employer can take a firm position, refuse to move on economics, and still satisfy its duty as long as it genuinely engaged with the union’s proposals and made a sincere effort to find common ground.²

Surface bargaining is not. Going through the motions without any real intention of reaching agreement, showing up but refusing to make counterproposals, bypassing the union to deal directly with employees, repeatedly canceling meetings, or making take-it-or-leave-it demands at the first session all point to surface bargaining. It is an unfair labor practice under Section 8(a)(5), and any impasse declared after surface bargaining is automatically invalid.³ An employer that implements changes based on a sham impasse will be ordered to rescind them and go back to bargaining.

Impasse Only Works on Mandatory Subjects

Section 8(d) of the NLRA requires bargaining over wages, hours, and other terms and conditions of employment. These are the mandatory subjects: health insurance, pensions, overtime rules, discipline procedures, seniority systems, and the like.⁴ Impasse on a mandatory subject is what unlocks unilateral implementation and the use of economic weapons.

Everything else is a permissive subject. Internal union affairs, the scope of the bargaining unit, and decisions about the company’s basic direction can be raised by either party, but neither can insist on them to the point of impasse. Bargaining to impasse over a permissive subject is itself an unfair labor practice, no matter how long negotiations lasted. If the real sticking point is a permissive subject, no lawful impasse follows and no unilateral changes are allowed.

What the Employer Can Do After a Valid Impasse

Once a valid impasse exists on mandatory subjects, the employer can put the terms of its last offer into effect. This is the most powerful consequence of impasse and also the most legally dangerous. Every term implemented must match something the employer actually proposed during negotiations.² New wage scales, benefit cuts, or work rules that never appeared across the table cannot be slipped in under cover of impasse.

If the employer offered a 2% raise and a $500 monthly health insurance contribution during bargaining, those are the only figures it can implement. A lower raise or a higher employee premium than what was proposed converts the change into an unlawful unilateral action, treated the same as if no impasse existed at all.

Implementation is temporary. The union remains the exclusive representative of employees, and the employer must continue to recognize it. The duty to bargain goes dormant during impasse. It does not disappear.

What Breaks an Impasse

Any meaningful change in circumstances can revive the duty to bargain. A shift in the employer’s financial situation, a change in union leadership, the passage of enough time that positions may have softened, or an explicit offer from either side to return with new proposals will do it. The union can break impasse simply by telling the employer it is willing to move from its prior position. At that point the employer must come back to the table.

Continuing to implement terms or refusing to meet after impasse has broken is a straightforward Section 8(a)(5) violation. Unions sometimes time these overtures strategically to maximize pressure or to challenge implemented terms, and employers who ignore a legitimate request to resume bargaining hand the union an easy unfair labor practice charge.

Notice Requirements Before a Strike or Lockout

Before either side uses economic weapons, Section 8(d) imposes notice requirements that many parties overlook with devastating consequences. Any party seeking to modify or terminate a collective bargaining agreement must take four steps in sequence:⁴

Serve written notice on the other party at least 60 days before the contract’s expiration date.
Offer to meet and negotiate a new agreement or the proposed modifications.
Notify the Federal Mediation and Conciliation Service, and any applicable state mediation agency, if no agreement has been reached within 30 days of the initial notice.⁵
Maintain all existing contract terms and refrain from strikes or lockouts for 60 days after the initial notice or until the contract expires, whichever comes later.

The penalty for skipping the FMCS notice is harsh. Any employee who strikes within a Section 8(d) notice period loses their status as an “employee” under the Act. They lose every protection the NLRA provides, including the right to reinstatement, and the employer can lawfully fire them for participating in the strike. That consequence applies even to workers who had no idea their union failed to file the required notice. Healthcare institutions face stricter timelines: 90 days’ notice to the other party and 60 days to FMCS.⁵

Strikes, Lockouts, and Replacement Workers

Section 7 of the NLRA protects the right of employees to engage in concerted activities, including strikes.⁶ The protections available to strikers depend on why they walked out.

Economic Strikers

Employees who strike to pressure the employer for better wages, hours, or working conditions are economic strikers. They keep their status as employees and cannot be fired for striking, but the employer can permanently replace them.⁷ Replaced strikers are not entitled to immediate reinstatement when the strike ends. They go on a preferential rehiring list and must be offered positions as openings arise, with no guarantee of when that will happen.

Unfair Labor Practice Strikers

If the strike was provoked by the employer’s own violations, such as a refusal to bargain in good faith or retaliation against union activity, the strikers cannot be permanently replaced. When the strike ends they are entitled to their jobs back, even if the employer has to discharge the workers hired to fill their positions.⁷ Unions have a strong incentive to characterize a strike as an unfair labor practice strike whenever possible, and employers have a strong incentive to keep their bargaining conduct clean.

Lockouts

A lockout is management’s counterpart to the strike: the employer bars employees from the workplace to apply economic pressure during a bargaining dispute. The Supreme Court recognized the legality of bargaining lockouts in American Ship Building Co. v. NLRB (1965), and employers can hire temporary replacement workers to maintain operations during a lockout. Whether an employer may use permanent replacements during a lockout remains legally unsettled, and doing so risks converting an otherwise lawful lockout into an unfair labor practice.

Lockouts are legal only when used as a genuine economic weapon. One motivated by anti-union hostility rather than bargaining leverage violates the Act. The Board looks at whether the lockout was designed to pressure the union into accepting the employer’s position or was instead intended to punish employees for exercising their Section 7 rights.

Filing an Unfair Labor Practice Charge

When either side believes the other has misused the impasse process by declaring impasse prematurely, implementing terms that were never proposed, or refusing to resume bargaining after circumstances changed, the remedy is an unfair labor practice charge filed with the NLRB.⁸ Charges are filed at the regional office closest to where the violation occurred.

The filing deadline is strict. You have six months from the date of the alleged violation to file the charge and serve a copy on the other party.⁹ Miss that window and the Board cannot issue a complaint, no matter how clear the violation. The only exception is for individuals whose military service prevented timely filing, in which case the six months runs from the date of discharge.

The regional office investigates and decides whether to issue a formal complaint. If the case moves forward, an administrative law judge holds a hearing and issues a decision. The NLRB cannot impose fines or punitive damages. Its remedies restore the status quo: rescinding unilaterally implemented changes, returning to the bargaining table, reinstating discharged workers, paying backpay, and posting a notice to employees about the employer’s obligations under the Act.⁸

The Hidden Cost: Pension Withdrawal Liability

One consequence of impasse catches employers off guard. Many unionized employers contribute to multiemployer pension plans covering workers across multiple companies in the same industry. When a collective bargaining agreement expires and is not renewed, which can happen after impasse, the obligation to contribute may cease. Under ERISA, permanently ceasing to have an obligation to contribute to a multiemployer plan constitutes a complete withdrawal.¹⁰

The financial exposure can be enormous. The withdrawing employer becomes liable for its proportionate share of the plan’s unfunded vested benefits, even if it made every required contribution during the life of the agreement.¹¹ The amount depends on the plan’s funding status and the employer’s share, and for large employers it can run into millions of dollars.

An employer that pushes negotiations to impasse, lets the CBA expire, and stops contributing may trigger withdrawal liability that dwarfs whatever it was trying to save at the bargaining table. Special rules apply in the building and construction, trucking, and warehousing industries, where the definition of withdrawal has additional conditions tied to whether the employer continues performing the same type of work in the same jurisdiction.

1
NLRB Research. Taft Broadcasting Co., 163 NLRB No. 055
2
National Labor Relations Board. Bargaining in Good Faith With Employees’ Union Representative
3
Office of the Law Revision Counsel. 29 USC 158 – Unfair Labor Practices
4
Office of the Law Revision Counsel. 29 USC 158 – Unfair Labor Practices
5
Federal Mediation and Conciliation Service. Collective Bargaining Mediation
6
Office of the Law Revision Counsel. 29 USC 157 – Rights of Employees
7
National Labor Relations Board. The Right to Strike
8
National Labor Relations Board. Investigate Charges
9
Office of the Law Revision Counsel. 29 USC 160 – Prevention of Unfair Labor Practices
10
Office of the Law Revision Counsel. 29 USC 1383 – Complete Withdrawal
11
Office of the Law Revision Counsel. 29 USC 1381 – Withdrawal Liability Established