The IRS effectively gives money away to low-income Americans who save for retirement. Workers meeting the agency’s income requirements can receive a Saver’s Tax Credit equal to as much as half of their total deposits into a 401(k) or IRA. The lower one’s income, the bigger the credit. The program, which was made permanent in 2006, gives a nice boost to the nation’s lowest-paid workers, who are also most vulnerable in retirement. And not taking advantage of the credit, said Jim Blankenship, a financial planner in New Berlin, Illinois, “is a lot like giving up an employer match for a 401(k).” Low-income workers do just that, a previous study found: 40 percent decline to participate when their employer offers a…