Retirement Plan Exceptions for Collectively Bargained Employees

Retirement plan exceptions for collectively bargained employees let employers run one set of rules for union workers and another for everyone else. The Internal Revenue Code carves out specific relief in coverage testing, nondiscrimination, multiemployer treatment, vesting, and funding, because unionized employees negotiate their benefits through an independent bargaining process. Applied correctly, these exceptions let a company offer a 401(k) with matching contributions to office staff while its union workforce participates in a completely separate multiemployer pension fund, with each plan judged on its own. Applied incorrectly, they can cost a plan its tax-qualified status.

The Threshold: A Bona Fide Bargaining Agreement

Every exception below turns on one question: is there a bona fide collective bargaining agreement? The tax code sets two hard requirements. The agreement must be a genuine contract between legitimate employee representatives and one or more employers. And the organization representing employees cannot qualify as “employee representatives” if more than half its members are owners, officers, or executives of the employer.¹ The second rule exists to block sham unions created specifically to unlock tax benefits.

For the coverage testing exclusion, the Secretary of Labor decides whether a particular agreement qualifies.² The IRS separately evaluates whether the bargaining was conducted at arm’s length, based on the facts and circumstances of each arrangement.³

The IRS has flagged several patterns that suggest bargaining was not conducted in good faith: benefits for an owner that are more generous than those offered to other employees, an employee representative that was created specifically for the benefit arrangement rather than existing independently, and bargaining agents on both sides who are effectively working together instead of negotiating at arm’s length.³ An arrangement that trips these indicators can lose its collectively bargained status even with a signed contract in the file.

Exclusion From Coverage Testing

Employers offering a retirement plan must show that the plan covers a sufficient percentage of non-highly compensated employees. Collectively bargained employees drop out of this calculation entirely, provided the Secretary of Labor has determined that the agreement is a legitimate collective bargaining agreement and there is evidence that retirement benefits were actually a subject of good-faith bargaining.²

The law does not require that the union accepted a retirement plan, or that the employer agreed to provide one. It only requires that retirement benefits were on the table. If a union bargained for higher wages instead of a pension and both sides discussed the trade-off in good faith, the exclusion still applies. Documentation matters here: meeting minutes, proposal letters, and final contract language should all reflect that retirement was a genuine topic.

The practical effect is that the corporate 401(k) and the union pension operate independently. Neither plan’s compliance depends on the other, and the employer is not forced to extend comparable benefits to both groups to keep either plan qualified.

Disaggregation When Both Groups Are in One Plan

Even when collectively bargained and non-union employees happen to participate in the same plan document, federal regulations require the plan to be split into separate components for testing. This is called mandatory disaggregation. If a plan benefits both collectively bargained and non-collectively bargained employees, the two groups form separate disaggregation populations, and each is treated as its own plan.⁴ If the collectively bargained population includes employees under different collective bargaining agreements, each agreement creates yet another separate population.

The nondiscrimination rules require that contributions or benefits not disproportionately favor highly compensated employees.⁵ Disaggregation puts a firewall between the groups. If union members contribute very little to their accounts or work under a different benefit formula, that outcome cannot drag down the testing results for management and non-union staff. Each segment passes or fails on its own.

Multiemployer Plans Treated as a Single Employer

Many collectively bargained plans, particularly in construction, transportation, and entertainment, involve multiple employers contributing to one fund. The tax code addresses this directly: for purposes of participation, nondiscrimination, vesting, and funding, all employers who are parties to the collective bargaining agreement are treated as though they were a single employer.⁶

That treatment produces several concrete effects. All employees of every contributing employer who share the same benefit formula are counted together when testing minimum participation. Service with any employer party to the agreement counts toward vesting, so a worker moving between contributing employers keeps building toward full ownership. Minimum funding is calculated as if all participants worked for one entity, which simplifies the actuarial math but makes underfunding a shared problem. And if the plan has a funding deficiency, each employer’s share of the excise tax is determined first by its delinquency in making required contributions, then by its proportional liability for contributions under the plan.⁶

This framework is what makes multiemployer pension funds work. Without it, a construction worker who cycled through five different contractors in a decade would end up with fragmented, partially vested benefits scattered across several plans instead of a single accumulating retirement benefit.

Vesting for Union Workers

Multiemployer collectively bargained plans were once allowed a ten-year cliff, meaning a worker received nothing until completing a full decade of service. Congress eliminated that option in 1996. Today, multiemployer plans must satisfy the same vesting schedules as other plans.⁷

The practical difference is aggregation. Collectively bargained plans count service across all contributing employers under the agreement, so a worker doesn’t restart the vesting clock every time they move to a new contractor or job site within the same union jurisdiction.⁶

Reciprocity Between Plans

Workers in unionized trades sometimes move between jurisdictions covered by different multiemployer plans. Reciprocity agreements let participants combine service credits earned under separate funds. The IRS recognizes two main structures.⁸

Under a “money follows the man” agreement, contributions that accrue in a worker’s away plan are transferred to the home plan and applied toward benefits there. Under a “pro rata” agreement, service earned in the away plan is recognized by the home plan for vesting and benefit accrual, but each plan pays its own share of the final benefit. Both approaches prevent the fragmentation that would otherwise occur when a worker crosses jurisdictional lines.

Plans that incorporate reciprocity provisions by reference need to submit the exact language of the relevant agreement sections when seeking a determination letter from the IRS. The IRS will not accept a reciprocity agreement in its entirety for this purpose; only the specific provisions being incorporated into the plan document are reviewed.⁸

Funding Zones and Withdrawal Liability

Multiemployer plans follow their own minimum funding rules. Each plan maintains a funding standard account that tracks charges (normal cost and amortization of unfunded liabilities) against credits (mostly employer contributions and experience gains), with the plan actuary running the calculation annually.⁹ Contributions made within two and a half months after the plan year ends count as if made on the last day of the plan year.

Plans are classified into financial health zones each year based on their funded percentage and projected shortfalls. A plan is in endangered status (yellow zone) if its funded percentage is below 80 percent, or it has or is projected to have a funding deficiency within the next seven plan years. A plan meeting both conditions is considered seriously endangered. A plan is in critical status (red zone) if its funded percentage is below 65 percent and projected assets plus anticipated contributions cannot cover projected benefits over the next seven years, or the plan has or is projected to have a funding deficiency within the next four years.¹⁰

Plans in critical status must adopt a rehabilitation plan within 240 days. Failure to do so triggers an excise tax equal to the greater of the regular funding deficiency tax or $1,100 per day until a rehabilitation plan is adopted. For any multiemployer plan with an accumulated funding deficiency, the initial excise tax is 5 percent of the deficiency, escalating to 100 percent if the shortfall is not corrected within the taxable period.¹¹ These penalties fall on the contributing employers, allocated based on their respective contribution delinquencies.

Separately, employers that stop contributing to an underfunded multiemployer plan cannot simply walk away. Under ERISA, the plan sponsor assesses a withdrawal liability against the departing employer, essentially a bill for the employer’s proportional share of the plan’s unfunded vested benefits. The basic formula multiplies the plan’s unfunded vested benefits by an allocation fraction: generally, the employer’s required contributions over the five years preceding the withdrawal, divided by all employers’ total contributions over the same period. The departing employer then pays annual withdrawal liability payments calculated from its historical contribution rate and contribution base.¹² Payments can stretch over many years, and the amounts can be substantial for employers that contributed to a heavily underfunded plan.

What Happens If the Exceptions Are Misapplied

If an employer misapplies these exceptions or cannot demonstrate a bona fide collective bargaining agreement, the retirement plan can lose its tax-qualified status. Participants become taxable on the value of their vested benefits as of the disqualification date. Contributions and earnings that accrue after disqualification lose their tax-deferred treatment, and the employer’s deductions for plan contributions are put at risk. Distributions made after disqualification also lose eligibility for rollover into IRAs or other tax-favored accounts.

The IRS evaluates the bargaining process on the facts and circumstances of each arrangement, and it can reject a claimed collectively bargained status regardless of whether the plan already received a favorable determination letter or the union has tax-exempt status.³ Employers relying on these exceptions should keep thorough records: negotiation proposals, counter-proposals, meeting notes, and the final contract language all serve as evidence that retirement benefits were a genuine subject of arm’s-length negotiation.

1
Office of the Law Revision Counsel. 26 USC 7701 – Definitions
2
Office of the Law Revision Counsel. 26 USC 410 – Minimum Participation Standards
3
Internal Revenue Service. Notice 2003-24 – Tax Problems Raised by Certain Trust Arrangements Seeking to Qualify for Exception for Collectively Bargained Welfare Benefit Funds
4
eCFR. 26 CFR 1.410(b)-7 – Definition of Plan and Rules Governing Plan Disaggregation and Aggregation
5
eCFR. 26 CFR 1.401(a)(4)-1 – Nondiscrimination Requirements of Section 401(a)(4)
6
Office of the Law Revision Counsel. 26 USC 413 – Collectively Bargained Plans
7
Office of the Law Revision Counsel. 26 USC 411 – Minimum Vesting Standards
8
Internal Revenue Service. Questions and Answers – Collectively Bargained Plans
9
Office of the Law Revision Counsel. 26 USC 431 – Minimum Funding Standards for Multiemployer Plans
10
Office of the Law Revision Counsel. 26 USC 432 – Additional Funding Rules for Multiemployer Plans
11
Office of the Law Revision Counsel. 26 USC 4971 – Taxes on Failure to Meet Minimum Funding Standards
12
Federal Register. Methods for Computing Withdrawal Liability, Multiemployer Pension Reform Act of 2014