If that's a $30,000 family policy, the 40% would only be applied to the amount beyond $21,000, not the whole amount. So it would have $3600 in tax charged to the insurance company. The amount of increase passed to the consumer would depend on the provider's policies.
If it's an individual plan, then the tax would be $8800 since the cutoff is $8,000 before the 40% kicks in.