President Obama misspoke when he said that immigrants living illegally in the U.S. would have to "pay any back taxes" in order to qualify for work papers under the plan he initiated via executive action. They would not.

The immigration plan announced by Obama on Nov. 20 provides a temporary relief of three years from the threat of deportation to parents who are in the country illegally but who have children who are U.S. citizens or lawful permanent residents. The parents must have lived in the United States for at least five years, and they must register, and pass background checks in order to obtain the reprieve. The White House estimates that 5 million people are eligible for "provisional unlawful presence waivers." If they meet certain requirements, those immigrants also would be given work authorization for three years.

For immigrants who step forward, the procedure is to make sure that they "start paying their fair share of taxes" so they can "temporarily stay in the U.S. without fear of deportation for three years at a time," says a White House fact sheet. The key word in there is "start." There is no mechanism to require immigrants in the country illegally to pay any back taxes in order to obtain a three-year work authorization.

An Obama administration official told us the president misspoke when he said that immigrants would have to "pay any back taxes."

President Obama's unilateral executive action on immigration will make hundreds of thousands, perhaps more than a million, illegal immigrants eligible for federal transfer payments. That will be done primarily through two widely used programs — the Earned Income Tax Credit, or EITC, and the Additional Child Tax Credit, or ACTC.

The two programs, intended for low-income workers, are what is known as refundable tax credits. That means they give workers a tax refund that is larger than their tax liability. So a family with a tax bill of $1,000 might receive an EITC "refund" of $5,000, meaning the family doesn't write a check to the government but rather receives a check from the government. The ACTC works similarly for low-income workers with children.

As it turns out, those two programs are already among the most corrupt and fraud-ridden in the entire federal government. A newly-released report from the inspector general of the Internal Revenue Service confirms that the EITC is plagued by fraud (which was already well known) and also reveals for the first time that the ACTC is even worse.

According to the inspector general, the IRS paid out $63 billion in EITC benefits in 2013. Of that, 24 percent, or about $15 billion, was given improperly to people not qualified to receive it. That improper payment rate has been enough to qualify the EITC as a "high risk" program for years.

The IRS paid out $26.6 billion in ACTC credits in 2013. The inspector general reports the child credit improper payment rate for that year was somewhere between 25.2 percent and 30.5 percent — worse than the EITC.

Considering that federal law defines a program as having "significant improper payments" when such payments exceed 2.5 percent of all the money the program sends out, those are pretty terrible numbers.