If you have lots of money, Tuesday, April 17, was one of the best tax days since the early 1930s: Top tax rates on ordinary income, dividends, estates, and gifts remain at or near historically low levels. That’s thanks, in part, to legislation passed in December 2010 by the 111th Congress and signed by President Barack Obama. Starting next January, rates may be headed higher.

For the 400 U.S. taxpayers with the highest adjusted gross income, the effective federal income tax rate—what they actually pay—fell from almost 30 percent in 1995 to just over 18 percent in 2008, according to the Internal Revenue Service. And for the approximately 1.4 million people who make up the top 1 percent of taxpayers, the effective federal income tax rate dropped from 29 percent to 23 percent in 2008. It may seem too fantastic to be true, but the top 400 end up paying a lower rate than the next 1,399,600 or so.

That’s not just good luck. It’s often the result of hard work, as suggested by some of the strategies below. Much of the income among the top 400 derives from dividends and capital gains, generated by everything from appreciated real estate—yes, there is some left—to stocks and the sale of family businesses. As Warren Buffett likes to point out, since most of his income is from dividends, his tax rate is less than that of the people who clean his office.

For more go to Blumberg Business Week.