If your company pays a health insurance premium every month and has no idea where that money goes, this guide is for you. Self-funding is how mid-size employers take back control of that spend — and it's less exotic than the insurance industry makes it sound. Here's how it works, what changes for you, and what to watch out for.
What Is a Self-Funded Health Plan?
In a self-funded (or self-insured) health plan, the employer pays its employees' actual medical claims instead of paying premiums to an insurance carrier. When claims are low, the employer keeps the difference. When they're high, stop-loss insurance caps the damage.
Since most employers don't want to process medical claims themselves, they hire a Third Party Administrator (TPA) to run the plan: paying claims correctly, keeping enrollment current, and handling the compliance work.
Fully insured, the carrier profits when your people stay healthy. Self-funded, you do.
Why Employers Choose Self-Funding
Cost Transparency
A fully insured premium is a black box — claims, administration, profit, and margin for error all bundled into one number that only moves in one direction. Self-funding unbundles it. You see the actual claims, the administrative fee, and the stop-loss premium as separate line items, which means you can finally tell which one is the problem.
Cash Flow
Instead of pre-paying a fixed premium whether anyone gets sick or not, you fund claims as they happen. In a good month, the surplus stays in your account earning interest — not the carrier's.
Plan Design Freedom
Self-funded plans are governed by federal law (ERISA) rather than state insurance mandates, so you're not locked into a one-size-fits-all product. You decide what the plan covers, how the deductibles and copays work, how prescription drugs are priced, and whether to use a traditional network or reference-based pricing. If your workforce is young and healthy, or concentrated in two cities, or heavy on a specific health need — the plan can reflect that.
Stop-Loss Protection
Self-funding doesn't mean unlimited risk. Stop-loss insurance is the backstop, and it comes in two layers:
- Specific stop-loss caps what you pay for any one person. If a single member has a catastrophic year — a premature birth, a cancer diagnosis — the stop-loss carrier reimburses everything above the threshold you chose.
- Aggregate stop-loss caps the plan as a whole, so an unlucky year across the whole workforce can only cost you so much.
We wrote a full guide to how stop-loss works and how to buy it well.
What the TPA Actually Does for You
The TPA is the engine room of a self-funded plan. When you're evaluating one, this is the job you're hiring for:
Paying Claims Correctly
Providers send claims in; the TPA checks each one against your plan — is this person covered, is this service a benefit, what's the contracted price, how much has this member already paid toward their deductible — and pays what the plan actually owes. It also sends the provider an explanation of what was paid and why, and your employee an explanation of what they owe. Industry-wide, roughly 5–10% of claims get paid incorrectly; every one of those errors is your plan's money, which is why how much of this runs on autopilot, and how accurately is worth asking about.
Keeping Enrollment Straight
New hires, terminations, marriages, new babies, open enrollment — the TPA keeps the roster current so coverage decisions are right on the day care happens, tracks each member's progress toward deductibles and out-of-pocket maximums, and handles COBRA for people who leave.
Managing How Care Is Priced
Whether your plan uses a provider network, direct contracts, or reference-based pricing, someone has to maintain the pricing rules, apply them to every claim, and handle the disputes when a provider disagrees. That's the TPA.
Keeping the Plan Legal
HIPAA privacy and security, ERISA reporting, non-discrimination testing, mental health parity. None of it is optional, and the penalties land on the plan sponsor — you — so the TPA's compliance discipline is your compliance discipline.
The Numbers Worth Watching
You don't need a dashboard of forty metrics. These four tell you most of the story:
- Loss ratio — claims paid as a share of what you budgeted for the plan. Healthy self-funded plans usually land around 75–85%. Consistently above 100% means the budget (or the plan design) needs work.
- Cost per member — total plan cost divided by covered members. The cleanest way to compare this year to last year, especially if headcount changed.
- Auto-adjudication rate — the share of claims your TPA processes without a human touching them. Higher means faster payments and lower administrative cost; it's the single best proxy for how modern the TPA's operation is.
- Denial rate — the share of claims denied. Too high suggests plan design problems or provider confusion. Suspiciously low can mean claims aren't being scrutinized at all.
The Honest Challenges
One Very Expensive Person
A single member with a serious condition can consume a huge share of plan spend. Stop-loss caps the financial damage, but you also want a TPA that spots high-cost situations early and gets case management involved while it can still help — not one that tells you about it at the annual review.
Bumpy Months
Claims don't arrive evenly. A quiet March and a brutal April are both normal. You need enough reserve to ride the swings, and a realistic annual budget — this is normal actuarial work, not a reason to stay fully insured, but it does need to be done.
More Moving Parts
Self-funding replaces one carrier relationship with several: a TPA, a stop-loss carrier, a pharmacy partner, maybe clinical-review vendors. A good TPA quarterbacks all of it so you have one accountable contact; a bad one leaves you refereeing vendor disputes.
Is Self-Funding Right for Your Company?
It fits best when three things are true: you have roughly 100 or more employees (below that, one bad year swings too hard, though level-funded products can bridge the gap), you have leadership willing to look at claims data a few times a year, and you're frustrated enough with premium increases to do something structural about them.
It fits badly if the company treats benefits as a set-and-forget line item. Self-funding rewards attention. Not much attention — a quarterly review is plenty with modern reporting — but more than zero.
How Technology Changes the Equation
The historical knock on self-funding was administrative burden — and with a legacy TPA, it's a fair knock. A modern platform removes most of it:
- 85–95% of clean claims are processed automatically, in seconds, with pre-payment error checks instead of after-the-fact recovery
- Coverage questions are answered instantly and electronically, not by fax and callback
- You see spend as it happens — not in a PDF that arrives 30 days after the quarter closed
- Members get answers from a portal and their phone instead of your HR team's inbox
That's what makes self-funding practical at mid-market size: automation gives a 200-person company the administrative precision the biggest carriers reserve for themselves — without the carrier.
If you want to see what your plan would look like self-funded — or your current self-funded plan run better — request a proposal and we'll model it from your real census and claims.