COBRA Premiums for Self-Funded Plans

Self-funded (also called self-insured) health plans operate under a fundamentally different cost structure than fully insured plans, and that distinction shapes how COBRA premiums are calculated, set, and administered. This page explains how plan sponsors determine the applicable premium for self-funded COBRA coverage, how federal rules under ERISA and the Internal Revenue Code govern that process, and where the rules diverge from fully insured arrangements. Understanding these mechanics matters because errors in premium-setting can expose plan administrators to excise tax liability under IRC § 4980B.

Definition and scope

A self-funded health plan is one in which the plan sponsor — typically an employer — bears the direct financial risk of paying covered claims rather than transferring that risk to an insurance carrier through a group policy. Self-funded plans are governed primarily by the Employee Retirement Income Security Act of 1974 (ERISA) and the Internal Revenue Code, with the Department of Labor (DOL) and the IRS sharing oversight authority (ERISA § 601–608, 29 U.S.C. §§ 1161–1168).

For COBRA purposes, a self-funded plan is subject to the same continuation coverage obligations as a fully insured plan — the same qualifying events, the same election windows, and the same maximum coverage durations apply. What differs is the mechanism for determining the "applicable premium," which is the ceiling on what a qualified beneficiary can be charged for continuation coverage.

Under federal rules, the applicable premium for a self-funded plan is not drawn from an insurance contract. Instead, plan administrators must independently calculate a premium based on the actual or reasonably anticipated cost of providing coverage to similarly situated active employees and their dependents. This self-calculated figure, plus the permitted 2 percent administrative charge, establishes the maximum amount a qualified beneficiary can be billed.

The regulatory context for COBRA administration at the federal level — including the interplay between ERISA, the Internal Revenue Code, and DOL guidance — provides the foundational framework within which self-funded premium rules operate.

How it works

The IRS established the cost-determination methodology for self-funded plans through Treasury Regulation § 54.4980B-8, Q&A-1 through Q&A-5. The regulation provides two permissible methods for determining the applicable premium.

1. The actuarial cost method

Under this approach, the plan uses actuarial assumptions to project the cost of providing continuation coverage for similarly situated non-COBRA beneficiaries. A qualified actuary produces a projection that accounts for expected claims, stop-loss thresholds, and plan-specific utilization. This method is more common among large employers whose self-funded plans carry sufficient claims history to support actuarial credibility.

2. The past-cost method

The past-cost method calculates the applicable premium by reference to actual claims paid in a prior 12-month period, adjusted for projected cost changes in the upcoming determination period. Specifically:

  1. The plan totals all claims paid for similarly situated participants during the prior 12-month base period.
  2. Administrative costs are added to that total.
  3. The sum is divided by the average number of covered participants during that period, then annualized to a monthly per-person figure.
  4. The resulting amount may be adjusted upward by a factor reflecting anticipated cost trends — the regulation does not cap this trend adjustment, but it must be reasonable.
  5. The final figure becomes the applicable premium for the new determination period.

The 12-month determination period must be established prospectively. Premiums cannot be revised mid-period except under a limited exception when the plan experiences a significant enough cost change that continuing the original premium would be materially inaccurate.

On top of the calculated applicable premium, plan administrators may charge an additional 2 percent as an administrative fee, for a total maximum charge of 102 percent of the applicable premium (IRC § 4980B(f)(4)). During a disability extension period — the additional 11 months available to certain Social Security disability beneficiaries — the ceiling rises to 150 percent of the applicable premium for those months.

Common scenarios

Large, self-funded employer using the past-cost method

A manufacturing company with 800 covered employees operates a self-funded medical plan. At the start of each plan year, the benefits team totals prior-year claims for active employees, adds third-party administrator (TPA) fees and stop-loss premiums, and divides by average covered lives. The resulting monthly figure — say, $720 per individual — becomes the applicable premium. Terminated employees electing COBRA are billed up to $734.40 per month (102 percent of $720).

Employer using the actuarial cost method for a small population

A law firm with 60 employees uses a self-funded plan with limited internal claims data. An actuary projects monthly costs based on demographic assumptions and regional benchmarks. Because the self-funded structure means the firm directly funds all claims, the actuarially derived figure may differ substantially from what a fully insured carrier would charge in the same market.

Separately calculated family tiers

Treasury Regulation § 54.4980B-8 allows — and in practice requires — distinct premium calculations for different coverage tiers. An employer can set one applicable premium for individual (employee-only) coverage and a separate, higher figure for family (employee-plus-dependents) coverage, reflecting the higher expected cost for each tier. Alternatively, the plan can use a single blended rate for all qualified beneficiaries.

COBRA combined with a health reimbursement arrangement (HRA)

Where an employer offers both a self-funded medical plan and an HRA, qualified beneficiaries may elect COBRA for either or both components independently. Each component carries its own applicable premium calculation, and each must independently satisfy the past-cost or actuarial cost methodology.

Decision boundaries

Understanding the limits of the applicable premium rules prevents both over-charging (which constitutes a violation) and under-charging (which affects the plan's financial sustainability).

Self-funded vs. fully insured: key contrast

Feature Self-Funded Plan Fully Insured Plan
Applicable premium source Actuarial projection or past-cost calculation Insurance carrier's active employee group rate
Who sets the rate Plan administrator (with actuarial or data support) Insurer (stated in the policy contract)
Rate revision mid-period Permitted only for significant cost change Generally follows carrier renewal schedule
State insurance law applicability Generally preempted by ERISA for single-employer plans State-regulated premium setting applies

Because single-employer self-funded plans are broadly preempted from state insurance regulation under ERISA § 514, state premium regulation that might otherwise constrain fully insured group rates does not govern the applicable premium calculation for self-funded arrangements. Multiple employer welfare arrangements (MEWAs) occupy a different regulatory position and may face state-level requirements alongside federal rules.

Permissible vs. impermissible premium amounts

When the determination period matters

The applicable premium is fixed for the entire 12-month determination period unless a significant cost exception applies. If claims spike mid-year, the plan sponsor absorbs that risk — it cannot retroactively increase the COBRA premium charged to beneficiaries during the current period. This is the core financial exposure of the self-funded model that distinguishes it from fully insured COBRA billing.

Third-party administrator involvement

Most self-funded plan sponsors contract with a TPA to handle COBRA billing, election tracking, and notice compliance. The TPA calculates premium invoices based on rates provided by the plan sponsor or actuary at the start of each determination period. The legal obligation to set a compliant applicable premium, however, rests with the plan sponsor as the plan administrator — delegation to a TPA does not transfer liability for incorrect premium calculations. Employers evaluating their administrative structure can find additional context on the COBRA Administration Authority home page.

References

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)