RRB-1099

• The RRB-1099 relates to railroad retirement benefits, which is what the "RRB" stands for. This IRS form is for the social security portion of any railroad retirement benefits received, and taxes this segment of your railroad benefits as though they were social security benefits. According to TurboTax, a portion of railroad retirement benefits are "equal to the Social Security benefits that a railroad employee or beneficiary would have been entitled to receive if that person had been covered under the Social Security system rather than the railroad retirement system."