WASHINGTON When the Supreme Court upheld the health care reform law on federal tax grounds, it restoked a housing issue that had been relatively quiet for the past year: the alleged 3.8 percent real estate tax on home sales beginning in 2013 that is buried away in the legislation.

Immediately following enactment of the health care law, waves of emails hit the Internet with ominous messages aimed at homeowners. A sample: Did you know that if you sell your house after 2012 you will pay a 3.8 percent sales tax on it? When did this happen? Its in the health care bill. Just thought you should know.

Once litigation challenging the laws constitutionality surfaced in federal courts, the email warnings subsided. But with the law scheduled to take effect less than six months from now, questions are being raised again: Is there really a 3.8 percent transfer tax on real estate coming in 2013? Does it pre-empt the existing $250,000 and $500,000 capital gains exclusions for single-filing and joint-filing home sellers, as some emails have claimed?

In case youve heard rumors or received worrisome emails about any of this, heres a quick primer. Yes, there is a new 3.8 percent surtax that takes effect Jan. 1 on certain investment income of upper income individuals including some of their real estate transactions. But its not a transfer tax and not likely to affect the vast majority of homeowners who sell their primary residences next year. In fact, unless you have an adjusted gross income of more than $200,000 as a single-filing taxpayer, or $250,000 for couples filing jointly ($125,000 if youre married filing singly), you probably wont be touched by the surtax at all, though you could be affected by other changes in the code if Congress fails to extend the Bush tax cuts scheduled to expire at the end of this year.

Even if you do have income greater than these thresholds, you might not be hit with the 3.8 percent tax unless you have certain types of investment income targeted by the law, specifically dividends, interest, net capital gains and net rental income. If your income is solely earned salary and other compensation derived from active participation in a business you have nothing to worry about as far as the new surtax.

Where things can get a little complicated, however, is when you sell your home for a substantial profit, and your adjusted gross income for the year exceeds the $200,000 or $250,000 thresholds. The good news: The surtax does not interfere with the current tax-free exclusion on the first $500,000 (joint filers) or $250,000 (single filers) of gain you make on the sale of your principal home. Those exclusions have not changed. But any profits above those limits are subject to federal capital gains taxation and could also expose you to the new 3.8 percent surtax.

Julian Block, a tax attorney in Larchmont, N.Y., and author of Julian Blocks Home Sellers Guide to Tax Savings, says it will be more important than ever to pull together documentation on the capital improvements you made to the property and expenses connected with the house including settlement or closing costs, such as title insurance and legal fees that increase your tax basis in order to lower your capital gains.

Since the health care law targets capital gains, you could find yourself exposed to the 3.8 percent levy on the sale of your home next year. Heres an example provided by the tax staff at the National Association of Realtors. Say you and your spouse have adjustable gross income (AGI) of $325,000 and you sell your home at a $525,000 profit. Assuming you qualify, $500,000 of that gain is wiped off the slate for tax purposes. The $25,000 additional gain qualifies as net investment income under the health care law, giving you a revised AGI of $350,000. Since the law imposes the 3.8 percent surtax on the lesser of either the amount your revised AGI exceeds the $250,000 threshold for joint filers ($100,000 in this case) or the amount of your taxable gain ($25,000), you end up owing a surtax of $950 ($25,000 times .038).

The 3.8 percent levy can be confusing, and can bite deeper when your taxable capital gains are far larger or you sell a vacation home or a piece of rental real estate, where all the profits could subject you to the investment surtax. Definitely talk to a tax professional for advice on your specific situation.

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Health care reform law to tax high earning home sellers