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But it's also worth noting that if they keep the employer-sponsored plan for the whole family, the premiums will almost certainly be payroll deducted on the pre-tax basis. On the other hand, if they opt to buy an individual market plan, the premiums would only be tax deductible to the extent that they (along with other medical expenses) exceed 10 percent of the family's household income, and assuming that the family opts to itemize their tax deductions (increasingly rare now that the Tax Cuts and Jobs Act has greatly increased the standard deduction).
How do the benefits differ? What would you owe in out-of-pocket costs if you were to be injured or get seriously ill? How does that compare with your out-of-pocket exposure on the employer-sponsored plan? Are your doctors in the network of the individual plan? You'll want to carefully consider all of these things before switching, and keep in mind that you won't be able to rejoin your employer's plan until the next open enrollment window offered by your employer.
There are other plans available year-round that are not individual major medical coverage. Most of these plans are not recommended as stand-alone coverage (with the exception of short-term plans, which can be adequate stand-alone coverage if you're healthy and you know that you need the coverage for only a short time; they are usually not at all adequate for longer-term coverage). These plans are not regulated by the Affordable Care Act, which means they can exclude pre-existing conditions, impose dollar caps on your coverage, and don't have to cover the ACA's essential health benefits. In most cases, these plans cannot really be compared with an employer-sponsored plan, since the coverage will be so much lower quality. If an insurance offer sounds too good to be true, read the fine print carefully. It may end up being a poor substitute for real health insurance, and you don't want to learn those details after you have a major claim.