ANALYSIS-Like other US investors, Romney enjoys lower income-tax rates

* Romneys' income comes from investments, not wages

* Low effective tax rate reflects tax code preference

* Romney benefits from private equity "carried interest"

WASHINGTON, Sept 21 (Reuters) - Living off your investments

is a much better deal tax-wise in the United States than living

off of a paycheck, as Mitt Romney's 2011 tax return underscored

on Friday.

Days after a secret video showed him scorning the almost 47

percent of Americans who pay no federal income taxes, the

Republican presidential challenger disclosed that his 2011

federal tax bill was $1.9 million.

That is a lot of money by any standards, but on an effective

basis, Romney's tax rate last year was 14.1 percent. That was

much lower than President Barack Obama's, at 20.5 percent, and

that of Romney's running mate, Paul Ryan, at 20 percent.

The main reason: Both Obama and his wife, Michelle, and Ryan

and his wife, Janna, got about half of their 2011 income from

wages. Not so for Romney and his wife, Ann.

The Romneys' 2011 tax return showed adjusted gross income of

$13.7 million: $3 million from taxable interest; $3.6 million

from dividends; $6.8 million from capital gains; and the balance

from other sources. Their wage income? Zero. That largely

explains their low effective tax rate compared with that of the

Obamas.

Why? The United States over the past 30 years has

deliberately favored investment income over wage income, which

is taxed at a top rate of 35 percent. In a combination of

trickle-down economic theory and raw political power, U.S.

investors have won preferred tax-code treatment.

That code has not been fully overhauled in 26 years. In that

time, many interest groups have loaded it down with loopholes,

exemptions, credits and other complexities, each with political

allies determined to protect it. Some of those tax breaks

benefit the poor and the middle class, and some the wealthy.

TAXES AND THE ELECTION

The outcome of the Nov. 6 presidential election will go a

long way toward deciding if a thorough tax code overhaul will be

attempted in years ahead and, if so, what it will look like.

Take carried interest, for instance, a major source of

income for Romney.

One of the wealthiest Americans ever to run for the White

House, the former Massachusetts governor built a fortune buying

and selling companies at Bain Capital as a private equity

financier. Those lucrative years gave Romney a tax advantage.

His campaign said in January he got $13 million in income

over the last two years from "carried interest," a form of

earnings available under the tax code to private equity partners

and some hedge fund managers.

The returns show that Romney still has an interest in funds

through Bain Capital. The Ann D. Romney Blind Trust lists a long

list of Bain-related transactions, for example.

Carried interest is taxed at the 15 percent investment

income-tax rate, not the higher ordinary tax rate.

Private equity partners say that is appropriate because

there are risks involved in their work. Critics say carried

interest is actually closely comparable to wage income.

Obama has proposed curbing the carried interest tax break

and taxing these gains at the ordinary income rate, while

Romney's position on the issue is still unclear.

Romney's effective tax rate is lower than many high-income

wage earners "because of the 15 percent rate on dividends and

capital gains and also the fact that much of that income likely

comes from carried interest," said Duke University tax law

professor Lawrence Zelenak.

The 2011 returns show the Romneys' effective tax rate would

have been just over 10 percent if they had taken the full

charitable-giving deductions to which they were entitled.

Effective tax rates vary wildly from person to person due to

the code's complexity. But counting all U.S. taxpayers, the

average income tax rate is 11.8 percent, according to the Tax

Foundation, a think tank in Washington, citing Internal Revenue

Service data for 2010.

In 2011, about 46 percent of Americans paid no federal

income tax, most of them because they were poor or elderly,

according to the Tax Policy Center, another think tank.

Almost two-thirds of those who paid no federal income tax

did pay federal employment taxes that support the Social

Security pension system and the Medicare health program.

Romney's 2011 return also shows a web of investments

stretching from the United States to tax-haven jurisdictions

such as the Cayman Islands, Luxembourg and the Netherlands.

"This doesn't strike me as a tax situation you'd want to be

in if you're running for president - to have pages and pages of

these foreign investments. There are many mysteries to these

returns," said Zelenak.

(Additional reporting by Kim Dixon and Patrick Temple-West;

Editing by Peter Cooney)