I'm in California, and my experience has been an employer will pay for most of your insurance. Typically I end up paying an extra $200 each month for insurance.
Adding on a family is a different story. Employers cover a lot less for family members. So I end up paying an extra $400 to cover the wife. If you have kids, add on more. It can add up quickly.
Every employer is different, but ^ this is pretty typical.
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