A fter years of paying into the Social Security system, many seniors are surprised to learn that the benefits they receive after retirement may be subject to federal income tax. T

Tax season usually brings a refund check for most workers, but if you're retired, you could wind up owing the IRS.

In April, the Social Security Administration begins increasing monthly benefit payments to more than 3.2 million people affected by the repeal of the Windfall Elimination Provision and Government Pension Offset. "The impact could be huge," said George Pikounis, financial advisor at Burns Estate Planning in Tallahassee, Florida, in an email.