In 2015, the U.S. federal government spent more on healthcare than on Social Security for the first time. The Affordable Care Act’s expansion of Medicaid and the growing availability of subsidies for exchange plans are driving much of the higher spending.

Enrollment in the ACA’s insurance exchanges will hover around 13 million in 2016, the Congressional Budget Office said in an expanded economic report Monday, down from its previous estimate of 21 million but still above HHS’ most optimistic projection.

This is the second year that the Affordable Care Act and taxes will collide, and two changes this year could make the cumbersome tax filing process a bit more complicated.

Janna Herron of The Fiscal Times fills you in on what you should know this time around—the forms, the penalties, and the deadlines.

Federal spending on major health care programs will jump by $104 billion, or 11.1%, this year, according to Congressional Budget Office estimates published on Monday.

Those figures include a $24 billion increase stemming from a shift in the timing of certain Medicare payments from 2017 into 2016. Today’s CBO figures are a detailed version of the broader estimates published last week.

The nonpartisan CBO projected in its 2016-2026 Budget and Economic Outlook that spending on federal health programs will make up 5.5% of the country’s gross domestic product this year, and reach 6.6% by the end of 2026.

The Congressional Budget Office (CBO) issued a new budget forecast last week. It should be a wake-up call to policymakers, and to the candidates running for president. It is also a clear indictment of fiscal policy during the Obama presidency.

The forecast shows annual federal budget deficits rising throughout the coming decade, pushing total federal debt to levels well above the historical norm. CBO projects the federal budget deficit will be $544 billion in 2016, or 2.9 percent of GDP. By 2026, the annual deficit will be nearly $1.4 trillion, or 4.9 percent of GDP. Over the period 2016 to 2025, CBO expects the federal government will need to borrow an additional $9.4 trillion, pushing total federal debt up to $23.8 trillion, or 86 percent of GDP.

The deficits projected in CBO’s forecast, and the level of debt they would cause, are almost unprecedented in the nation’s history.

When the Affordable Care Act was drafted, the Congressional Budget Office expected people to sign up quickly for new health insurance.

Now, two years into the law, it’s clear that progress is going to be slower. The Obama administration acknowledged as much in late 2014, and again in October, when it presented its own modest predictions. Monday, the budget office also agreed, slashing its 2016 estimate by close to 40%.

The House GOP emerged from its retreat earlier this month united in its goal to come up with an alternative to Obamacare. But the deeper into health policy the members dig, the more difficult finding consensus will become.

Republicans have determined that they will select pieces of different GOP proposals rather than simply put forth one of the party’s old plans as its main health proposal. The older conservative health plans are unworkable in a post-ACA world.