The U.S. Supreme Court upheld the constitutionality of President Obama’s healthcare reform legislation Thursday morning. That means a proposed tax increase on investment income is set to kick in, barring further Congressional changes to the tax code. But nothing takes effect until next year and investors shouldn’t make any rash decisions about their portfolios, according to tax experts.

“There’s no need to overreact right away today,” said Tim Steffen, director of financial planning at Robert W. Baird & Co. “Take a deep breath, and figure out what this really means for you before you start making long-term decisions.”

The new law imposes a Medicare tax of 3.8 percent on investment income for married couples with over $250,000 in combined income, or individuals with over $200,000 in income. That includes capital gains, interest, dividends, annuities, rental income and royalties. It also includes a 0.9 percent tax increase on wages for people in the same income levels.  

But Steffen said the financial services industry has been preparing for the possible tax bump for the last year.

Andy Friedman, principal of The Washington Update, also saw this coming.  

“I never thought there was a realistic chance the Supreme Court would overturn the whole law,” Friedmansaid. “I thought they might overturn the individual mandate. So in my mind, the 3.8 percent was always going to take effect.

“I am surprised that people are now saying, ‘Oh my gosh, taxes are going up.’”

In addition, Steffen believes two other pending tax changes could be more impactful, including the Bush tax cuts and the estate tax cuts, set to expire at the beginning of next year. The Bush tax cuts, for example, will impact everybody.

“As big a decision as this is and as impactful as this will be for investors, this is only one of three tax increases we’ve been keeping an eye on for next year,” Steffen said.

The 0.9 percent tax on wages is small compared to the tax boost on wages for the wealthy if the Bush tax cuts expire, which would increase from 35 percent to 40 percent, Friedman said.

Also, when making an investment portfolio decision tax rates should definitely be a factor, but Steffen warns against making them the driving factor behind a decision. Advisors should base buys and sells on the merits of the underlying investments.

But like it or not, the health care reform does mean a tax increase, and advisors can take certain steps to prepare for it. For one, if clients were planning to recognize capital gains or do stock options next year, they might want to consider doing those before the end of the year because it will be less expensive, Steffen said.  

Also, a lot of companies tend to pay out bonuses in January, and they may look to accelerate that into December to avoid the additional 0.9 percent tax for their employees’ benefit, Steffen added.

Friedman also recommends selling assets to lock in gains at the current rate. In addition, he suggests looking at tax-free investments like municipal bonds because their value rises as tax rates rise.

Investors should also be wary of dividend-paying stocks until we see how high dividend taxes will be, Friedman said. If lower dividend taxes expire as part of the Bush tax cuts, dividend taxes could go back up into the 40-percent range.

Friedman says investors shouldn’t have a knee-jerk reaction, however, to the news about the healthcare law, Friedman said.

“You should never make a fast decision on anything, except maybe a horse race,” Friedman said.  “You don’t just sit down and fire off a sell order on everything you own. You sit down with your advisor and figure out what the best way to respond is.”

There’s always a possibility that the Obama healthcare reform could get repealed, but that would involve Congress going back and changing the law. According to Steffen, this possibility is very unlikely.