The Affordable Care Act will cost 11 percent less than previously expected, according to a Congressional Budget Office estimate released Monday.

Compared to the CBO's January forecast, ObamaCare is projected to cost $142 billion less thanks primarily to a 20 percent drop in estimated costs for the law's subsidies. As for the significant revision to expected subsidy expenditures, that's the result of "projections of slower growth in premiums and, to a lesser extent, slightly lower exchange enrollment," according to the CBO.