HDHP Out-of-Pocket Maximums and Annual Limits

Out-of-pocket maximums and annual limits define the ceiling on how much an enrollee can be required to pay for covered healthcare services in a given plan year. For high-deductible health plans, these limits operate within a dual regulatory framework: the IRS sets minimum thresholds that determine HSA eligibility, while the Affordable Care Act sets absolute ceilings that apply to all qualifying health plans. Understanding both layers is essential for accurately projecting worst-case annual healthcare costs under any HDHP plan design.

Definition and scope

An out-of-pocket maximum (OOPM) is the total amount an enrollee pays in cost-sharing — deductibles, copayments, and coinsurance — before the plan covers 100% of in-network costs for the remainder of the plan year. Once this threshold is crossed, the insurer absorbs all further covered expenses.

For a plan to qualify as an HDHP under IRS rules governing HDHPs and HSAs, the out-of-pocket maximum cannot exceed a limit the IRS adjusts annually for inflation. For 2024, the IRS set the HDHP out-of-pocket maximum at $8,050 for self-only coverage and $16,100 for family coverage (IRS Revenue Procedure 2023-23). These are ceiling values — plans may set lower OOPMs and still qualify as HDHPs.

Separately, the ACA imposes its own out-of-pocket limits under 42 U.S.C. § 18022(c). For 2024, the ACA limit stands at $9,450 for self-only and $18,900 for family coverage (CMS 2024 Out-of-Pocket Limit Guidance). Because the IRS HDHP ceiling sits below the ACA ceiling, any compliant HDHP automatically satisfies the ACA requirement.

The "annual limit" terminology also encompasses the prohibition under the ACA on lifetime and annual dollar limits for essential health benefits — a distinct concept from the OOPM. Plans cannot cap the total dollar value of essential health benefits paid over a year or over a lifetime (HHS, 45 CFR § 147.126).

How it works

Out-of-pocket accumulation follows a structured sequence:

  1. Deductible phase — The enrollee pays 100% of covered service costs until the deductible is met. For 2024, IRS minimum deductibles are $1,600 (self-only) and $3,200 (family) (IRS Rev. Proc. 2023-23). Every dollar applied to the deductible counts toward the OOPM.
  2. Cost-sharing phase — After the deductible, the enrollee typically pays coinsurance (a percentage) or copayments per service. These payments continue to accumulate against the OOPM.
  3. Maximum reached — Once accumulated deductible plus cost-sharing equals the OOPM, the plan pays 100% of covered in-network costs for the rest of the plan year.
  4. Plan year reset — On January 1 (or the plan anniversary), the accumulator resets to zero.

A critical structural distinction governs family plans: embedded vs. non-embedded deductibles and OOPMs. Under an embedded structure, each individual in the family has a sub-limit — no single member must pay more than the individual OOPM before their own costs are covered at 100%, even if the family aggregate has not been reached. Under a non-embedded (aggregate-only) structure, the family deductible must be fully met before the plan begins cost-sharing for any member. The HDHP decision framework becomes materially different depending on which structure a plan uses. The ACA requires that plans with family OOPMs above the self-only ACA limit must embed an individual OOPM at the self-only limit for each family member (CMS FAQ, Part XXVII).

Out-of-network costs may accumulate in a separate counter or not count toward the in-network OOPM at all, depending on plan design. Enrollees with HDHP network rules and provider access concerns should verify this before selecting a plan.

Common scenarios

Scenario A — Healthy enrollee, low utilization. An individual uses only preventive services (covered before the deductible under ACA requirements) and one urgent care visit. Total out-of-pocket spending: $350. The OOPM functions as theoretical protection; actual exposure is minimal. The HSA accumulates unspent contributions for future use.

Scenario B — Moderate utilization, family plan with embedded OOPM. A family of four has one member requiring surgery. Under an embedded OOPM of $8,050, the surgical patient's individual costs are capped at $8,050 even if the $16,100 family aggregate has not been reached. The remaining 3 family members continue accumulating costs independently.

Scenario C — High utilization, non-embedded aggregate OOPM. A family plan with a $3,200 aggregate deductible and a $16,100 aggregate OOPM. Two members incur significant expenses simultaneously. Until the aggregate $3,200 is met across all members combined, no cost-sharing reduction applies. Both members' costs count toward the single $16,100 aggregate ceiling.

Scenario D — Out-of-network care. An enrollee receives emergency care from an out-of-network provider. Depending on the plan, those costs may not count toward the in-network OOPM, potentially exposing the enrollee to costs beyond what they anticipated. HDHP emergency care coverage rules govern how such situations are classified.

Decision boundaries

Selecting between plans — or evaluating an HDHP against a PPO — often turns on the OOPM gap. Key decision thresholds:

The comprehensive resource on HDHP fundamentals provides additional context for placing these limits within the broader structure of consumer-directed health plan design.

References

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