The passage of Obamacare is perhaps the most important recent example. By CBO’s 2010 estimates, Obamacare authorized $940 billion in new spending to expand insurance coverage over its first ten years. Congress partly offset these costs with provisions for new revenue like the medical-device tax and the so-called “Cadillac tax” on expensive employer-sponsored plans. To make up the remaining difference, it relied on Medicare changes similar to proposals that had been considered previously in the Senate Finance Committee’s earlier draft of the legislation: changes to physician payments, cuts to Medicare Advantage, and new Hospital Insurance revenues. All told, the actuaries credited Obamacare with $575 billion in net Medicare savings — even as those savings were used to paper over the law’s new spending. These ten-year estimates have changed over time, as the law’s schedule did not provide for full implementation until several years into the initial ten-year budget window.