The Congressional Budget Office has estimated ObamaCare will "reduce the amount of labor used in the economy by roughly half a percent" — about 800,000 full-time jobs. It seems likely that four especially steep cliffs — including two where marginal tax rates can approach 100% or more — will factor into work and hiring decisions.

he 50th employee: For companies with 49 workers that do not offer its employees health coverage, the hiring of just one more worker would carry a penalty of $40,000.

A firm with at least 50 workers that doesn't offer coverage must pay a $2,000 fine per worker (minus the first 30 workers) if even one of its employees receives ObamaCare subsidies.