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mandatory, permissive, illegal — know which is which

Collective Bargaining Subjects

3

Categories

Mandatory, Permissive, Illegal

1

Duty

Bargain in good faith

1

Impasse

Permits unilateral implementation

three columns, three rules

The Bargaining Subject Sorter

Each topic falls into one column. The category determines whether bargaining is required, optional, or forbidden.

mandatory · MUST

Bargain Required

Wages, hours, terms and conditions of employment. No unilateral changes without bargaining.

  • Wages, salaries, bonuses
  • Health insurance and pensions
  • Hours, overtime, scheduling
  • Discipline procedures
  • Layoff and recall procedures
  • Workplace rules incl. drug testing
  • Health and safety practices

permissive · MAY

Bargain Optional

Either side may propose. Neither must agree. Cannot insist to impasse.

  • Internal union affairs
  • Identity of bargaining team members
  • Performance bonds
  • Benefits for already-retired employees
  • Strike settlement provisions

illegal · CANNOT

Bargain Forbidden

Cannot be negotiated even with mutual agreement. Statutorily prohibited.

  • Closed shop (mandatory union membership before hire)
  • Hot cargo agreements
  • Discriminatory provisions
  • Yellow dog clauses
  • Featherbedding (paying for work not performed)

Three Shop Types

closed shop

Illegal everywhere

Mandatory union membership before hire. Banned by Taft-Hartley.

union shop

Conditional

Must join union after hire. Legal in non-right-to-work states only.

open shop

Legal everywhere

No union membership required. Standard in right-to-work states.

Exam Traps

Closed shop is ILLEGAL everywhere

Union shop (must join after hire) is legal in non-right-to-work states. Open shop is legal everywhere. The exam tests the distinction.

Insisting on permissive subjects is itself a ULP

Permissive subjects can be discussed but not insisted upon to impasse. Insisting converts a permissive proposal into an unfair labor practice.

Surface bargaining is unlawful

Going through the motions without intent to reach agreement. Refusing to make any concession over many sessions can be evidence.

Drug testing is MANDATORY

Workplace rules including drug testing are mandatory subjects. Employer cannot make unilateral changes without bargaining.

Closed shop is illegal

Mandatory union membership BEFORE hire is illegal under Taft-Hartley. Union shop after hire is legal in non-right-to-work states.

Impasse permits unilateral action

After good-faith bargaining to genuine deadlock, employer can implement its last best offer. Until then, no unilateral changes.

1
Mandatory subjects

You and your roommate must bargain rent split, cleaning schedule, noise rules. You cannot decide unilaterally.

2
Permissive subjects

You may bargain over kitchen paint color if you both want. Neither can force the other to discuss it to impasse.

3
Illegal subjects

You cannot bargain to evict the third roommate based on her religion. No agreement makes it lawful.

4
Impasse after good-faith bargaining

After many sessions of genuine deadlock on rent, you can implement your last best offer.

Mandatory must. Permissive may. Illegal cannot. Bargain in good faith always.
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Reviewed by Sarah L., PrepSolution Content Editor, HR
Sources verified against HRCI 2026 standards
Updated May 2026