Why it matters
"Actuarially sound" sounds like praise. It's actually a test: does the rate cover the costs the plan can reasonably expect, on assumptions that hold up? A sound rate isn't too low, and it isn't padded either.
The test matters most when you're comparing quotes. Two quotes for the same plan can differ by $100,000 because one assumes less medical trend or leaves out a margin for a bad year. That doesn't make the plan cheaper to run. If claims come in as expected, the missing money has to come from somewhere, and the next renewal catches up.
Where the term comes from
There's no single legal definition for employer health plans. The formal uses are elsewhere:
- Medicaid managed care. Federal rules at 42 CFR 438.4 require state Medicaid managed care rates to be actuarially sound and certified by an actuary. The actuarial standard for that work, ASOP 49, describes sound rates as ones that provide for all reasonable, appropriate and attainable costs.
- State rate laws. Most states require insurance rates that are not excessive, inadequate or unfairly discriminatory. "Inadequate" means too low to cover expected costs. "Excessive" means more than needed. "Unfairly discriminatory" means charging similar risks differently without a cost-based reason.
The working idea carries over to any quote: enough to cover what you can reasonably expect, and no more than that.
Worked example: two quotes for the same plan
An illustrative 100-employee group with $1,000,000 in claims last year. Fees (admin and stop-loss) are held flat for simplicity.
| Piece | Quote A | Quote B |
|---|---|---|
| Claims | $1,000k | $1,000k |
| Trend | 8%: $80k | 2%: $20k |
| Fees | $120k | $120k |
| Margin | $40k | $0 |
| Quote | $1,240k | $1,140k |
Quote B is $100,000 cheaper. All of the difference is assumptions: a lower trend and no margin. Claims, fees and the plan are the same.
What happens when claims run as expected
Claims grow 8%, to $1,080,000. With $120,000 in fees, the year costs $1,200,000.
Next year's sound rate starts from the higher claims: $1,080,000 × 1.08 + $120,000 + $40,000 = $1,326,400.
| Quote A | Quote B | |
|---|---|---|
| This year | $1,240k | $1,140k |
| Next year | $1,326k | $1,326k |
| Increase | +7.0% | +16.4% |
Both groups end up at the same rate. The group that took Quote B saved $100,000 up front, came up $60,000 short, and then faces an increase more than twice as large. The +16.4% assumes nobody tries to recover the $60,000. If the insurer or stop-loss carrier does, it goes higher.
Read the transcript
Two quotes, same plan. One is a hundred thousand dollars cheaper. Only one is actuarially sound. Here's how to tell.
An actuarially sound rate covers every cost you can reasonably expect: claims, trend, fees and room for a bad year. Not less, and not more than it needs to be.
Take a hundred-employee group: a million in claims last year. Add eight percent trend, eighty thousand. A hundred twenty thousand in fees. Forty thousand for a bad year. One point two four million.
The cheaper quote assumes two percent trend and no room for a bad year. One point one four million.
Then claims rise eight percent, as expected. The cheap quote comes up sixty thousand short. Someone pays the gap, and the next renewal catches up: about sixteen percent instead of seven.
A sound quote shows its work: the trend, the data and the margin. And unlike Medicaid rates, it rarely comes with an actuary's sign-off. So the checking falls to you.
Ask your broker three things. What trend does this quote assume? Room for a bad year? Who pays if claims run over? If claims come in as expected, what's next year's increase? Find out more at actuariallysound dot com.
Who pays the gap
It depends on how the plan is funded.
- Self-funded. The employer pays claims as they come in, so the employer covers the shortfall, up to its stop-loss limits.
- Level-funded. Aggregate stop-loss usually covers claims above the fund this year. The carrier prices that loss into the renewal.
- Fully insured. The insurer absorbs it this year. A group large enough to be rated on its own claims sees it at renewal.
Either way, an under-priced year doesn't disappear. It moves.
Who checks a quote
Medicaid managed care rates are certified as actuarially sound by an actuary. An employer quote usually isn't.
Insurers do file small group rates with state regulators, with an actuary's certification behind them. But that certification covers the insurer's rate filing, not the specific quote your group receives. Self-funded and level-funded funding rates generally aren't certified to anyone. So the checking falls to the employer and its broker.
A sound quote makes that easy. It shows its work: the trend assumed, the data behind it, and the margin for a bad year.
Common misunderstandings
Questions to ask your broker
- What trend does this quote assume, and over what period?
- Is there room for a bad year, and who pays if claims run over?
- If claims come in as expected, what's next year's increase?
- Why is the cheaper quote cheaper: assumptions, discounts or fees?