Of the countless reasons that congressional Republicans hate the Affordable Care Act enough to shut down the government, the most politically potent is the claim that it will do untold damage to the economy and cripple small companies. Orrin Hatch has said that Obamacare will be “devastating to small business.” Ted Cruz argues that it is already “the No. 1 job killer.” And the vice-president of the National Federation of Independent Businesses called it simply “terrible.” So it comes as some surprise to learn that Obamacare may well be the best thing Washington has done for American small business in decades.

The G.O.P.’s case hinges on the employer mandate, which requires companies with fifty or more full-time employees to provide health insurance. It also regulates the kind of insurance that companies can offer: insurance has to cover at least sixty per cent of costs, and premiums can’t be more than 9.5 per cent of employees’ income. Companies that don’t offer insurance will pay a penalty. Republicans argue that this will hurt companies’ profits, forcing them to stop hiring and to cut workers’ hours, in order to stay below the fifty-employee threshold.

The story is guaranteed to feed the fears of small-business owners. But the overwhelming majority of American businesses—ninety-six per cent—have fewer than fifty employees. The employer mandate doesn’t touch them. And more than ninety per cent of the companies above that threshold already offer health insurance. Only three per cent are in the zone (between forty and seventy-five employees) where the threshold will be an issue. Even if these firms get more cautious about hiring—and there’s little evidence that they will—the impact on the economy would be small.

Meanwhile, the likely benefits of Obamacare for small businesses are enormous. To begin with, it’ll make it easier for people to start their own companies—which has always been a risky proposition in the U.S., because you couldn’t be sure of finding affordable health insurance. As John Arensmeyer, who heads the advocacy group Small Business Majority, and is himself a former small-business owner, told me, “In the U.S., we pride ourselves on our entrepreneurial spirit, but we’ve had this bizarre disincentive in the system that’s kept people from starting new businesses.” Purely for the sake of health insurance, people stay in jobs they aren’t suited to—a phenomenon that economists call “job lock.” “With the new law, job lock goes away,” Arensmeyer said. “Anyone who wants to start a business can do so independent of the health-care costs.” Studies show that people who are freed from job lock (for instance, when they start qualifying for Medicare) are more likely to undertake something entrepreneurial, and one recent study projects that Obamacare could enable 1.5 million people to become self-employed.

Even more important, Obamacare will help small businesses with health-care costs, which have long been a source of anxiety. The fact that most Americans get their insurance through work is a historical accident: during the Second World War, wages were frozen, so companies began offering health insurance instead. After the war, attempts to create universal heath care were stymied by conservatives and doctors, and Congress gave corporations tax incentives to keep providing insurance. The system has worked well enough for big employers, since large workforces make possible the pooling of risk that any healthy insurance market requires. But small businesses often face so-called “experience rating”: a business with a lot of women or older workers faces high premiums, and even a single employee who runs up medical costs can be a disaster. A business that Arensmeyer represents recently saw premiums skyrocket because one employee has a child with diabetes. Insurance costs small companies as much as eighteen per cent more than it does large companies; worse, it’s also a crapshoot. Arensmeyer said, “Companies live in fear that if one or two employees get sick their whole cost structure will radically change.” No wonder that fewer than half the companies with under fifty employees insure their employees, and that half of uninsured workers work for small businesses or are self-employed. In fact, a full quarter of small-business owners are uninsured, too.

Obamacare changes all this. It provides tax credits to smaller businesses that want to insure their employees. And it requires “community rating” for small businesses, just as it does for individuals, sharply restricting insurers’ ability to charge a company more because it has employees with higher health costs. And small-business exchanges will in effect allow companies to pool their risks to get better rates. “You’re really taking the benefits that big companies enjoy, and letting small businesses tap into that,” Arensmeyer said. This may lower costs, and it will insure that small businesses can hire the best person for a job rather than worry about health issues.

The U.S. likes to think of itself as friendly to small businesses. But, as a 2009 study by the economists John Schmitt and Nathan Lane documented, our small-business sector is among the smallest in the developed world, and has one of the lowest rates of self-employment. One reason is that we’ve never had anything like national health insurance. In a saner world, changing this would be a reform that the “party of small business” would celebrate. ♦