Self-Funded vs. Fully-Insured Health Plans: Which Is Right for Your Business?

A plain-English comparison of self-funded and fully-insured health plans: how each one works, what they cost, who benefits, and how to choose the right structure for your company.

By Kingsfoil Health Editorial Team, Employer Benefits Desk Published April 24, 2026 Updated October 2, 2026 11 min read

A fully-insured plan charges a fixed premium, and the carrier takes the claims risk. A self-funded plan has your company pay its own claims and buy stop-loss insurance. A fully funded plan returns $0 in a healthy year.¹ The sweet spot for level-funded plans, which sit between the two, is often 25 to 500+ employees.¹

Self-funded vs. level-funded vs. fully-insured

Factor	Fully-insured	Level-funded	Self-funded
Who pays claims	Carrier	Employer, with stop-loss as a backstop	Employer, with stop-loss as a backstop
Monthly cost	Fixed premium	Fixed payment	Varies with claims, admin fees, and stop-loss
Healthy-year result	Returns nothing: $0¹	May return a portion of unused claims funds as a refund or credit, depending on the carrier’s terms²	Savings may stay with the employer
Claims data	Limited or none	Available to the employer	Full access
Governing law	ERISA plan; state insurance law also regulates the insurer³	ERISA plan; state law regulates the carrier and the stop-loss policy³⁴	ERISA plan; state law regulates the stop-loss policy³⁴
Plan design flexibility	Carrier’s menu	Carrier’s menu, with more levers	Highly customizable
Administrative load	Low	Low to moderate	Moderate
Best-fit size	Any	Sweet spot often 25 to 500+ employees; smaller groups may qualify in some states¹	Larger groups with steady claims and finance capacity

Our level-funded guide covers the middle option in detail, and the three-way comparison puts all three side by side.

Every year at renewal, the same conversation happens. The quote arrives, premiums are going up, and the explanation points to the market and claims trends. The question that comes up less often is whether the plan structure itself is still the right one. Self-funded vs. fully-insured is the biggest fork in how a company pays for employee health coverage, and many businesses never chose it. They landed on the fully-insured road by default.

What is a fully-insured health plan?

A fully-insured health plan is the traditional arrangement most small and mid-sized businesses know. The employer pays a fixed monthly premium to an insurance carrier (Aetna, Cigna, BlueCross, UnitedHealthcare) and the carrier takes on the risk. If claims come in higher than expected, the carrier absorbs it. If claims come in lower, the carrier keeps the difference.

The carrier is responsible for:

Setting the premium
Paying claims
Administering the plan
Absorbing the risk of a bad year

The employer is responsible for paying the premium and distributing ID cards. The simplicity is the pitch.

The cost of that simplicity is that the premium covers more than your team’s care: the carrier’s administrative cost, reserves, and a share of the risk pool, which includes employers whose teams use more care than yours. In a healthy year, none of that comes back to you.¹

One separate point: if a fully-insured carrier spends too little of its premiums on care, the ACA’s medical loss ratio rules may require it to pay rebates. Those rebates depend on the carrier’s whole book of business, so they’re unrelated to your own claims year.⁵

What is a self-funded health plan?

A self-funded health plan, sometimes called a self-insured plan, flips that structure. Instead of paying a fixed premium to a carrier, the employer sets aside funds and pays claims directly as they’re incurred. The carrier (or a third-party administrator, or TPA) still processes claims and provides network access, but on the employer’s behalf, while the employer holds the claims risk.

In a self-funded plan, the employer is responsible for:

Funding claims as they come in
Paying a fixed administrative fee to the TPA or carrier that runs the plan
Buying stop-loss insurance to limit exposure on catastrophic claims
Seeing, and acting on, the actual claims data

When claims run lower than expected, the savings may stay with the employer. When claims run higher, stop-loss covers the excess above a defined threshold. The employer trades fixed predictability for transparency, control, and potential upside.

In a fully-insured plan, the number you see each year is next year’s rate. In a self-funded plan, you see where the dollars went, and you can act on it.

Why many small businesses end up fully-insured

Fully-insured is the product most small employers are offered first. It’s pre-packaged and simple to quote, and it needs the least attention from the employer. Self-funded and level-funded arrangements take more work to quote and manage, so they get explained less often.

Visibility plays a part too. Small employers often don’t see their claims data, and without it, it’s hard to judge whether the current plan is priced fairly. You can’t negotiate what you can’t see.

Ask your broker to walk through level-funded and self-funded options at your next renewal, alongside the fully-insured quotes.

Separately, under the Consolidated Appropriations Act of 2021, brokers must disclose in writing their expected direct and indirect compensation before new sales, renewals, or changes.

When self-funded makes sense (and when it doesn’t)

Self-funding works well for some employers and poorly for others. The distinction is mostly about demographics, cash flow, and engagement.

Employers who benefit most from self-funding tend to have teams that skew younger or healthier than the broader risk pool, stable claims experience, and enough cash cushion to absorb month-to-month variability. They want visibility into where their healthcare dollars go, and they’re willing to engage with plan design decisions. With the level-funded sweet spot often at 25 to 500+ employees, companies in that range can start by modeling a level-funded plan against their current quote.¹ Availability varies by state, and some states restrict stop-loss for small groups.⁴

Self-funding is a weaker fit when a team has known, ongoing high-cost claimants that drive up stop-loss quotes, when cash flow can’t absorb claims variance, when the group is very small (stop-loss economics get thin at small scale), or when leadership doesn’t want to be involved in plan design.

For businesses that fit the first list but aren’t ready to jump fully into self-funding, level-funded plans are a middle step. They smooth the cash flow into a fixed monthly payment while still giving you access to your data and a potential refund or credit when claims run low.

Stop-loss: the piece that makes self-funding workable

The concern almost every employer raises about self-funding is the same: what happens if someone on our team has a catastrophic claim? The answer is stop-loss insurance.

Stop-loss is a separate policy that sits behind your self-funded plan and limits your exposure. There are two types, and many employers carry both:

Specific stop-loss protects against any single individual’s claims exceeding a defined threshold for the year
Aggregate stop-loss protects against your total claims across the whole group running above a defined ceiling, expressed as a percentage above projected annual claims

With a well-designed stop-loss policy, your worst-case financial outcome in a self-funded plan is defined by your contract rather than open-ended. Limits and terms vary by carrier.

For a deeper walk-through, see What Is Stop-Loss Insurance and Why Every Self-Funded Employer Needs It and Aggregate vs. Specific Stop-Loss.

How to decide

The decision usually comes down to three questions.

1. Do you have visibility into your current claims experience? If you don’t, that alone is a reason to explore alternatives. Claims data is the most important input to any benefits decision.

2. Is your team healthier than the average pool the carrier is pricing you against? If yes, a small-group fully-insured premium, which is community rated across a pool, may be pricing you above your own experience. Larger fully-insured groups are experience-rated too, so the gap is smaller there. A level-funded or self-funded structure lets your own claims history count.

3. Can your cash flow handle month-to-month variability? Fully self-funded plans vary month to month based on actual claims. Level-funded plans fix that variability into one payment. Both use stop-loss to limit exposure to catastrophic claims. Pick the one your finance team can live with.

A common path is a progression: start fully-insured, move to level-funded for a plan year to see your data, then decide whether to stay there or move to full self-funding.

Where to start

Get the data first. The structure decision follows.

Ready to see what your numbers look like? We run this analysis for every client, free, no obligation. Talk to us.

Kingsfoil Health, Rate Shock Survival Guide. States that a fully funded plan returns $0 in a healthy year and that the level-funded sweet spot is 25 to 500 employees. Kingsfoil Health’s view is that larger groups often fit too. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶
UnitedHealthcare, What is a level-funded health plan?. Describes a possible refund of unused claims funds, or a credit toward the next year, depending on the plan’s terms. ↩
U.S. Department of Labor, Employee Retirement Income Security Act (ERISA). Federal law governing employer-sponsored benefit plans, including self-funded health plans. ↩ ↩² ↩³
National Association of Insurance Commissioners, Stop Loss Insurance, Self-Funding and the ACA. Self-funded plans avoid some ACA requirements, including community rating in the small-group market, and state law on stop-loss varies. ↩ ↩² ↩³
CMS, Medical Loss Ratio. Insurers must spend at least 80% or 85% of premium on care and quality or rebate the difference to customers. ↩

Frequently asked questions

What is the main difference between self-funded and fully-insured health insurance?

In a fully-insured plan, the employer pays a fixed premium to a carrier, and the carrier assumes all claims risk. In a self-funded plan, the employer pays claims directly as they come in, may keep savings from low-claims years, and uses stop-loss insurance to limit catastrophic risk. The core trade-off is predictability versus control and transparency.

Is self-funded health insurance only for large companies?

No longer. Level-funded plans, a packaged form of self-funding, have a sweet spot of roughly 25 to 500+ employees, and smaller groups can find them in some states. Availability varies by state, and some states restrict stop-loss for small groups. Fully self-funded arrangements usually suit larger groups with steady claims and a finance team ready to manage month-to-month variation. Where the line falls depends on claims experience and stop-loss pricing.

What are the disadvantages of self-funded health insurance?

Self-funded plans require the employer to fund claims from cash flow, which creates month-to-month variability. Administrative responsibilities are higher. Without good stop-loss coverage, a single large claim can be financially painful. These risks can be managed with the right plan design, but they're real.

How much can a business save by switching from fully-insured to self-funded?

It varies with group claims experience, demographics, and the starting cost structure, and nobody can promise a figure before reviewing your data. A healthy group may see lower costs and, with a level-funded plan, a potential refund or credit when claims come in below projections, depending on the carrier's terms. The larger benefit is visibility: you see your claims data and can manage costs proactively.

Do self-funded plans comply with the Affordable Care Act?

Mostly, with some exceptions. Private-employer health plans of every funding type fall under ERISA, the federal law that governs employer benefit plans. A self-funded plan is generally not subject to state insurance mandates, and it's exempt from some small-group ACA rules, such as community rating and the essential health benefits package. It still has to meet many ACA requirements, such as preventive services coverage and dependent coverage to age 26. In practice, employees typically can't tell the difference in day-to-day use.

Can a small business switch back to fully-insured if self-funding doesn't work out?

Yes, though the practical timeline is usually 12 months: you commit to your plan design and stop-loss policy for the plan year. At renewal, you can move back to a fully-insured arrangement. Before you do, check how claims incurred in the old plan year but not yet paid (run-out claims) will be handled, and what your stop-loss contract says about claims that are still open.

Where do level-funded plans fit between self-funded and fully-insured?

A level-funded plan is self-funding packaged into one fixed monthly payment with stop-loss bundled in. It may return a portion of unused claims funds as a refund or a credit, depending on the carrier's terms. It suits employers who want claims data and potential upside without month-to-month swings in cost. Read level-funded health plans explained for the full picture.

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