Here are the biggest tax breaks – and the amount of cash Uncle Sam would save if they were eliminated.
Health Care:
Insurance premiums: he biggest single tax break, by far, comes from the subsidy paid for health insurance paid by companies for their employees. (The premium paid on your behalf amounts to income, but doesn't show up that way on your tax return, so you don't pay taxes on it.) Uncle Sam gets hit twice on this one; not only do you pay no tax, your employer gets to deduct premium payments from the company's tax return. Annual cost: $180 billion
Other medical expenses – those paid out of pocket – are also deductible, at a cost of $10 billion in uncollected taxes. If you're self-employed, you get to deduct health insurance premiums, for another $6 billion.
Total annual cost: $196 billion
Homeownership:
Mortgage Interest: he government provides all kinds of incentives to buy a house – including the Federal Reserve's recent fire sale on mortgage rates. But the biggest, and costliest to the Treasury, is the tax break on interest paid on money borrowed to buy a home. If you're in, say the 28 percent tax bracket, you get back 28 cents of every dollar you pay in mortgage interest. Last year those pennies added up to roughly 11 percent of the total federal budget deficit. Cost: $101 billion.
Imputed Rent: This is another tax break that favors homeowners over renters. If you own a home, you probably don't pay yourself rent. But you benefit you derive from the use of your house is worth just as much as a renter would pay. That income – known as "imputed rent" – isn't taxed. If it were, the revenue generated would pay for about 5 percent of the deficit. Cost: $51 billion.
Capital gains exclusion: When it comes time to sell your house, you may walk away with more than you paid for it. On most investments, you'd pay capital gains tax on the entire profit. But a portion of your capital gain on a home is excluded from capital gains tax. Cost: $23 billion
Property tax deduction: o one likes to pay income taxes on money they earned to pay other taxes. In the case of property tax on a home you live in, you get a break. Cost: $22 billion.
Total annual cost: $197 billion
Savings, investment and retirement:
Capital Gains and Dividends: ome critics of these investment taxes argue they should be abolished altogether: the current tax code splits the difference by taxing them at a lower rate than ordinary income. That difference – the cost to the government of lowering the rate – largely benefits high-income households. In 2011, about three-fourths of the benefit of this tax break went to the top 1 percent of U.S. households. Cost $77 billion
Retirement plans: If you participate in a savings plan at work – like a 401(k) or IRA – you don't have to pay taxes on the money you put into the account and, in many cases, the tax on investment gains is postponed until you retire and begin spending it. Cost: $62 billion
If you're in a defined-benefit pension plan – where your employer contributes and you get a monthly check when you retire – those contributions are also not taxed. Cost: $52 billion
Investments: You don't pay taxes on the interest earned on life insurance savings ($25 billion) or on municipal bonds ($36 billion.) And when you die, any investment gains on money you leave to your heirs doesn't get taxed. ($24 billion.)
Total cost: $276 billion
Other big tax breaks:
Charitable donations: The tax code encourages people to give to their favorite charities, including nonprofit schools, health care providers, and other service organizations. This is another tax break that tends to benefit wealthy taxpayers. Cost: $49 billion.
State and local taxes: n top of federal taxes, most people also pay state and local taxes, including income and sales taxes. Every tax dollar you paid to another jurisdiction is a dollar you get to exclude form federal taxes. Cost: $46 billion.