Opponents of the proposed tax on high-cost insurance plans in the Senate's healthcare legislation argue that it would hurt a lot of hardworking factory workers or teachers who had traded wage gains in return for good health benefits. Proponents of the tax portrayed opposition to it largely as a special-interest issue driven by self-protective unions, the Washington Post reports. But according to a new analysis, the tax would actually fall equally on nonunion plans: At least 80% of the workers whose plans would be subject to the tax in 2019 would be in nonunion jobs, according to the analysis.