Child tax credit: Falls to $500 per child from $1,000. The refundable portion also reduced.
American Opportunity Tax Credit: Expires. The lesser value HOPE tax credit for college tuition is reinstated. Several smaller education tax benefits also expire.
Earned Income Tax Credit: Expansion of eligibility for the credit expires.
Marriage penalty relief: Expires. Effectively that means a low- or middle-income two-earner couple will owe more to the IRS than they would if they were single making the same income.
Estate tax: Parameters revert to pre-2001 levels. The exemption level falls to $1 million from $5 million; and the top tax rate on taxable estates rises to 55 percent, up from 35 percent.
Expired already for 2012. Income exempt from the Alternative Minimum Tax in 2012 -- for which taxpayers will file returns next year -- falls to $33,750 for individuals and $45,000 for married couples. That's down from $50,600 and $78,750, respectively, if the exemption amounts had been adjusted for inflation.
As a result more than 30 million people will be hit by the so-called "wealth" tax, up from 4 million to date.
Payroll tax holiday
Expires. The Social Security tax rate reverts to 6.2 percent, up from 4.2 percent, on the first $110,100 in wages. Effectively, someone making $50,000 will pay another $1,000 in payroll taxes next year.
Unemployment benefits extension
The federal extension expires. That means workers who lose their jobs after July 1, 2012, will only receive up to 26 weeks in state unemployment benefits, down from as many as 99 weeks in state and federal benefits that had been available until recently.
By one estimate, more than 2 million claimants will lose their benefits by January.
A host of smaller individual and business tax breaks will have expired. A bipartisan bill from the Senate Finance Committee proposes to extend many of them, but it has not passed the Senate or House yet.
Medicare doc fix
Expires. Medicare payment rates for physician services drops by 27 percent.
Some budget experts count as part of the fiscal cliff the onset of a new Medicare surtax on high-income households under health reform.
But unlike the other fiscal cliff tax provisions, the new tax was not written into law as a wink-wink "temporary" provision. It is, however, included to reflect the magnitude of tax increases set to take effect simultaneously in 2013.