Multi-Employer Health Plans Explained: How Taft-Hartley Benefits Work for Mid-Size Companies

If you run a company with 20 to 250 employees, you have probably felt the squeeze at renewal time. Premiums climb, plan options shrink, and your team starts asking questions you do not have great answers to. It is a frustrating cycle, and many employers assume the only options are fully funded group plans or going the individual route.

But there is a third path that has quietly powered some of the most stable benefit programs in the country for decades: the multi-employer health plan, formally known as a Taft-Hartley trust. Originally built for unionized trades, these plans are now accessible to a much wider range of employers, and for mid-size companies looking for cost stability and richer benefits, they deserve a serious look.

In this guide, we will walk through everything a mid-size employer needs to know about Taft-Hartley health plans: how they work, who qualifies, what the real costs look like, and how to decide if this structure fits your workforce. We will also show you how to model your projected costs using the Health Plan Cost Projector tool below.

What Is a Multi-Employer Health Plan?

A multi-employer health plan is a benefits trust fund established under the Taft-Hartley Act of 1947. Originally, the law created a framework for labor unions and employer associations to jointly administer benefit programs. The key idea is simple: instead of one company bearing all the risk for its employees' health costs, many companies pool their employees together into a single large plan.

Think of it like a buying co-op for health benefits. When 50 small and mid-size companies combine their employees into one trust with 5,000 or 10,000 covered lives, they negotiate with the same leverage as a Fortune 500 employer. That means better network contracts, lower administrative fees per person, and more stable year-over-year costs.

How the Trust Structure Works

A Taft-Hartley trust is managed by a joint board of trustees, typically split evenly between employer representatives and employee or union representatives. In non-union trusts (which are the ones most mid-size employers join today), the board may include industry association leaders and independent fiduciaries.

The board makes all major decisions: which carriers to contract with, what plan designs to offer, how reserves are managed, and how surpluses are distributed. Participating employers pay a fixed contribution per employee per month (PEPM), and the trust handles everything else -- claims processing, compliance filings, COBRA administration, stop-loss procurement, and network negotiations.

Who Is Eligible?

Eligibility has expanded significantly over the past decade. While traditional Taft-Hartley plans required a collective bargaining agreement, modern multi-employer trusts accept:

• Non-union employers in specific industries (construction, technology, professional services, healthcare, logistics)
• Employers participating through a Professional Employer Organization (PEO) that sponsors or partners with a trust
• Trade association members (industry groups that establish benefit trusts for their members)
• Companies with as few as 20 full-time employees, depending on the trust's underwriting guidelines

Why Mid-Size Employers Are Turning to Multi-Employer Plans

The mid-size employer segment -- companies with 20 to 250 employees -- sits in an awkward spot in the benefits market. You are too large to qualify for many small-group protections and subsidies, but too small to self-fund comfortably or command large-group pricing. Multi-employer plans address this gap directly.

Cost Stability Year Over Year

One of the biggest advantages is renewal predictability. In a standalone group plan, one employee with a cancer diagnosis or premature birth can spike your renewal by 30 to 60 percent the following year. In a multi-employer trust with thousands of covered lives, that same claim is absorbed across a much larger pool. Typical annual increases in well-managed trusts range from 3 to 7 percent, compared to 8 to 15 percent for standalone mid-size groups.

Access to Tier-1 Networks

Multi-employer trusts often hold direct contracts with national carriers. A trust covering 8,000 lives can negotiate the same PPO discount tiers as a single employer with 8,000 employees. For a 50-person company, this means your employees get access to the same network breadth and negotiated rates as employees at much larger corporations.

Lower Administrative Costs

Benefits administration is expensive when you do it alone. Between compliance filings, COBRA management, eligibility tracking, claims appeals, and plan document maintenance, a mid-size employer can easily spend $40 to $80 per employee per month on administrative overhead. Multi-employer trusts spread these costs across all participating employers, typically reducing the admin load to $15 to $30 PEPM.

Fiduciary Protection

When you participate in a Taft-Hartley trust, the board of trustees takes on fiduciary responsibility for the plan. This shifts significant legal liability away from your company. You still have obligations as a participating employer, but the heavy compliance lifting -- ERISA reporting, non-discrimination testing, summary plan descriptions -- is handled by the trust and its legal counsel.

How Multi-Employer Plan Costs Compare to Fully Funded Group Plans

Let us look at real numbers. For a mid-size employer with 75 employees in a metropolitan area, here is how the math typically breaks down:

Fully Funded Group Plan (Standalone)

• Average PEPM (employer share): $620 to $780
• Annual employer cost: $558,000 to $702,000
• Typical renewal increase: 8 to 15 percent
• Administrative fees embedded in premium: 15 to 22 percent
• Network tier: mid-market (regional PPO)

Multi-Employer Trust

• Average PEPM (employer contribution): $520 to $680
• Annual employer cost: $468,000 to $612,000
• Typical renewal increase: 3 to 7 percent
• Administrative fees: 8 to 14 percent (transparent, broken out separately)
• Network tier: national PPO (Blue Cross Blue Shield or equivalent)

The first-year savings alone can range from $50,000 to $120,000 for a 75-person group. But the compounding effect is where the real value lives. Over three years, the difference in renewal trajectories can save a mid-size employer $200,000 to $400,000 compared to staying on a standalone group plan.

Understanding the Joint Trustee Model

The governance structure is what makes Taft-Hartley plans different from every other benefit arrangement. Unlike a fully funded plan where the carrier makes all the decisions, or a self-funded plan where the employer bears all the risk, a multi-employer trust creates shared governance.

What the Board Controls

The joint board of trustees makes decisions on plan design (deductibles, copays, out-of-pocket maximums), carrier selection and network contracts, reserve policy and surplus distribution, vendor management (pharmacy benefit managers, wellness programs, telehealth), and contribution rate adjustments. This means participating employers have a collective voice. If the majority of employers want to add a mental health benefit or reduce the prescription drug copay, the board can make that change for the entire trust. One employer could never push that kind of change on its own with a carrier.

Transparency and Accountability

Because Taft-Hartley trusts are governed by ERISA, they are required to file annual reports (Form 5500), maintain audited financial statements, and provide summary plan descriptions to all participants. This level of transparency far exceeds what most employers see from their fully funded carrier, where premium components are often opaque.

Plan Design Flexibility in Multi-Employer Trusts

Modern multi-employer trusts have moved well beyond the one-size-fits-all model. Most trusts now offer multiple plan tiers so participating employers can choose what works for their workforce and budget.

Common Plan Tiers

A typical multi-employer trust might offer three to five plan options:

• Platinum/Gold: Low deductible ($250 to $500), low copays ($15 to $25), broad formulary. Best for employers competing for talent in tight labor markets.
• Silver: Mid-range deductible ($1,000 to $2,000), moderate copays ($30 to $50), standard formulary. The most popular tier for mid-size employers balancing cost and coverage.
• Bronze/HDHP: High deductible ($3,000 to $5,000), HSA-compatible, lower premiums. Good for younger, healthier workforces or as a second option alongside a richer plan.

Ancillary Benefits Bundled In

Many trusts bundle dental, vision, life, disability, and employee assistance programs into the trust. This simplifies administration and usually reduces the total cost compared to purchasing each benefit separately. Some trusts also include telemedicine, mental health counseling, financial wellness programs, and even legal services as part of the standard package.

Potential Drawbacks and Risks to Consider

No benefit structure is perfect, and multi-employer plans have real trade-offs that employers should weigh carefully.

Less Individual Control

Because plan design is decided by the board of trustees, an individual employer cannot customize the plan to its exact specifications. If you want a unique benefit that the trust does not offer, you may need to supplement it outside the trust or advocate for it through the governance process.

Withdrawal Liability

Under certain multi-employer pension plans (and some health trusts structured similarly), withdrawing from the plan can trigger financial liability. For health-only trusts, withdrawal liability is less common, but employers should review the trust agreement carefully before joining. Most modern health trusts allow withdrawal with 60 to 90 days notice and no penalty, but always verify this in writing.

Contribution Obligations

Once you join a trust, you are committed to the contribution rate set by the board. If the trust experiences adverse claims and raises the PEPM, participating employers must pay the new rate. The board provides advance notice (usually 90 to 120 days), but the employer cannot opt out of the increase without leaving the trust entirely.

Not Available Everywhere

Multi-employer trusts are more common in certain industries (construction, transportation, healthcare, technology) and regions. Employers in rural areas or niche industries may find fewer options. However, PEO-sponsored trusts and national trade associations have expanded availability significantly in recent years.

How to Evaluate Whether a Multi-Employer Plan Is Right for Your Company

Before making a move, ask these questions:

What Has Your Renewal History Looked Like?

If you have experienced two or more years of double-digit renewal increases, a multi-employer trust may provide more stability. Pull your last three years of renewal data and compare the trend to the 3 to 7 percent range typical of well-managed trusts.

What Is Your Current Per-Employee Cost?

Calculate your total employer spend per employee per month, including premiums, administrative fees, and any self-funded claims costs. Compare this to the PEPM contribution rates quoted by trusts you are evaluating. A spread of 10 percent or more usually makes the switch worthwhile.

How Important Is Network Breadth?

If your employees are spread across multiple states or you are competing for talent in metro areas with many provider options, the national PPO networks available through multi-employer trusts can be a significant upgrade over regional carrier networks.

Do You Have High Administrative Burden?

If your HR team spends significant time on benefits compliance, COBRA administration, claims issues, and plan document maintenance, offloading these to a trust can free up resources for more strategic work.

Steps to Join a Multi-Employer Health Plan

The enrollment process varies by trust, but typically follows this path:

1. Identify eligible trusts: Work with a benefits advisor who has relationships with multi-employer trusts in your industry or region. PEOs that partner with trusts can also provide access.
2. Request a proposal: The trust will need your census data (employee demographics, zip codes, current plan enrollment) to generate a contribution quote.
3. Review the trust agreement: Have your legal counsel review the participation agreement, focusing on contribution obligations, withdrawal terms, and fiduciary responsibilities.
4. Select plan tiers: Choose which plan options you will offer to your employees from the trust's menu.
5. Execute the participation agreement: Sign the agreement and submit the required enrollment documentation.
6. Transition employees: Coordinate with the trust's enrollment team to move employees from your current plan. Most trusts provide enrollment support and communication materials.
7. Begin contributions: Start paying the PEPM contribution rate on the effective date, usually the first of the following month or quarter.

Model Your Projected Health Plan Costs

Related reading: PEO health coverage for construction companies | when to switch PEO providers | ICHRA as an alternative to group coverage

Frequently Asked Questions

Can a non-union company join a Taft-Hartley health plan?

Yes. While the original Taft-Hartley Act was designed for unionized industries, many modern multi-employer health trusts accept non-union employers. These trusts are often organized by trade associations, industry groups, or PEOs. The key requirement is usually membership in the sponsoring organization and meeting the minimum employee count, which is typically 20 or more full-time employees.

How long does it take to transition to a multi-employer plan?

The typical timeline from initial inquiry to effective coverage is 45 to 90 days. This includes census analysis, proposal review, legal review of the trust agreement, employee communication, and enrollment processing. Most employers align the transition with their current plan's renewal date to avoid mid-year disruption.

What happens if the trust raises contribution rates significantly?

Trust boards are required to provide advance notice of contribution changes, usually 90 to 120 days. If a rate increase is unacceptable, you can typically withdraw from the trust with proper notice (60 to 90 days in most health trusts). However, well-managed trusts have historically maintained more moderate increases than the standalone market, so dramatic spikes are uncommon.

Are my employees' benefits portable if they change jobs?

If your employee moves to another employer that participates in the same multi-employer trust, their benefits can continue seamlessly with no gap in coverage. This is a significant advantage in industries with high mobility, such as construction, technology, and professional services.

How does COBRA work in a multi-employer plan?

COBRA administration is handled by the trust, not by the individual employer. When an employee loses coverage due to a qualifying event, the trust sends the required COBRA notices and manages the entire continuation process. This removes one of the most time-consuming compliance obligations from the employer's plate.

Can I still offer supplemental benefits outside the trust?

Absolutely. Many employers who participate in a multi-employer trust also offer voluntary supplemental benefits like accident coverage, critical illness plans, hospital indemnity, pet coverage, or additional life coverage. These can be offered through a separate carrier or a Section 125 cafeteria plan alongside the trust-sponsored core benefits.

What compliance filings is the employer still responsible for?

When you participate in a multi-employer trust, the trust handles the major ERISA filings (Form 5500, summary plan descriptions, summary of benefits and coverage). The employer is typically responsible for providing accurate census data, remitting contributions on time, and distributing certain notices to employees (such as marketplace notices under the ACA). Your benefits advisor can outline the exact split of responsibilities for the trust you are considering.

References

1. U.S. Department of Labor, Employee Benefits Security Administration. "Reporting and Disclosure Guide for Employee Benefit Plans." dol.gov/agencies/ebsa
2. Kaiser Family Foundation. "2025 Employer Health Benefits Survey." kff.org
3. International Foundation of Employee Benefit Plans. "Multiemployer Employee Benefit Plans." ifebp.org
4. Society for Human Resource Management. "Health Plan Cost Management Strategies for Mid-Size Employers." shrm.org
5. National Coordinating Committee for Multiemployer Plans. "NCCMP Health Plan Trustee Guide." nccmp.org