Senate Republicans reworking Obamacare are considering taxing employer-sponsored health insurance plans, a move that would meet stiff resistance but which would help make the tax preferences for health insurance more equal. The move could raise billions in revenue that could be used to help stabilize the fragile individual insurance market. But it could be politically risky, since it could expand the impact of GOP health proposals from Medicaid recipients and those who buy insurance on their own to the roughly 177 million people who get coverage through their employers.

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