2014 is already an unusual year, if only for the dozens of tax provisions that lawmakers on Capitol Hill allowed to expire at the end of 2013 – a move that is certain to change your personal tax filings next year.

A fair number of these changes were due to congressional inaction, says Sharon Lassar, director of the School of Accountancy at the University of Denver’s Daniels College of Business. That political gridlock particularly affected what were known as “extenders” – special tax breaks or deductions that Congress extended at one- or two-year intervals, rather than attempt to budget them permanently.

The loss of these extenders, plus the effects of new legislation, means that Americans will have to deal with a number of costly tax changes. 24/7 Wall St. identified seven potentially costly changes in the tax code for 2014.

There are a lot more extenders now than there were 20 years ago. “Every time there’s a new tax bill, a new provision is put into the tax codes,” Dr. Lassar notes. “As the years progress, the number of extenders continue to grow.”

Another issue is the ongoing economic weakness. “In order to extend a tax break Congress has to find a way to pay for it,” she says, “by either cutting some other spending or raising taxes on someone else. And as the fiscal situation gets tighter, it gets more and more difficult to find a way to pay for the extenders.”

These are seven notable, unexpected or potentially costly tax changes for 2014.

1. Affordable Care Act Requirement

While many Obamacare tax provisions were rolled out in the past few years, there’s a major ACA-related change coming into play for 2014. It’s a penalty for people who don’t purchase health insurance. As John Roth, a senior tax analyst with CCH group told the Chicago Tribune in 2012, soon after the law was upheld by the U.S. Supreme Court, “the government can’t force you to buy insurance, but it can tax you for not buying it.” Single persons who don’t purchase health insurance will now have to pay a tax equal to one percent of their income, or $95 – whichever amount is greater.

2. Optional Deduction for State Sales Taxes

As of January 1, individuals can no longer deduct their itemized state and local sales taxes. Dr. Lassar notes that in 2013, a taxpayer had the option to deduct either their state income tax or the amount equal to their state’s sales tax as an itemized deduction. Taxpayers in states with high income taxes — such as New York, Connecticut and many of the New England states — could deduct their income taxes. And people living in the seven states with no income tax — Alaska, Florida, Nevada, South Dakota, Texas, Washington and Wyoming — would deduct their sales tax. But “that sales tax deduction is going away,” she says.

3. Mass Transit vs. Car Commuters

Another victim of Congressional neglect is the exclusion of expenses for taking mass transit from taxable income. Thanks to that tax break expiring, commuters using mass transit can only exclude $130 per month, compared to the previous $245. “It used to be … the transportation benefit was small because you had a small cost to your bus pass,” says Dr. Lassar. “And as bus passes increased (as transportation costs, like fuel, rose), this transportation fringe benefit kept increasing.”

On the other hand, if your employer allowed you to exclude payments on your company parking, that benefit has gone up $5 this year, to $250. “This is the biggest disparity between the two components of the commuter benefit that we have ever seen,” Natasha Rankin, executive director of the Employers Council on Flexible Compensation, lamented to The Washington Post.

4. Home Mortgage Debt Forgiveness

Before the passage of the Mortgage Relief Act of 2007, any debt discharged was treated as taxable income. The act allowed taxpayers to exclude any such relief of mortgage debt through foreclosure, as well as any debt reduced by mortgage restructuring, for as much as $2 million. That provision expired December 31, which means any cancellation of debt income is now taxable. This tax break was designed to help people with underwater mortgages, as it allowed them to not pay taxes on any debt they had been forgiven. But again, this measure has expired.

5. Education Deductions

A deduction of up to $4,000 towards higher education expenses expired with the new year, as did a deduction of up to $250 for teachers who made out-of-pocket purchases towards school supplies.These provisions have reportedly been allowed to expire in the past, and were then retroactively reinstated. But for now, Congress can’t come to an agreement on how to pay for these very popular measures.

6. IRA Distributions to Charity

Before 2014, older individuals who wanted to direct up to $100,000 of their IRA distributions to their favorite charities could do so tax free. As the Associated Press notes, this tax break worked well for people in upper middle class income brackets, rather “than taking a distribution from your IRA and then donating the cast to a charity and claiming an itemized deduction.” One impact of this change is that some charitable giving by Americans could decline.

7. Residential Energy Credits

You can no longer get a $500 tax credit for making home improvements to save energy at your primary place of residence – nor can contractors get a $2,000 credit per energy-efficient home they build for a customer. “These were all provisions that were supposed to have gone away long ago,” says Dr. Lassar. “Congress just kept extending them year after year … and when Congress didn’t act on them (in 2013), they went away.”

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