What are Forms RRB-1099 and RRB-1099-R?
RRB stands for Railroad Retirement Benefits.
Form RRB-1099 reports the Social Security portion of RRBs, whereas the RRB-1099-R reports the pension portion of RRBs.
These identical-looking forms are entered in different places in TurboTax, and it's important that you enter your RRB form in the right place for the proper tax treatment.
One easy way to tell which one you have is by looking at Copy C (the copy you're supposed to keep with your tax records). Copy C of the RRB-1099 is blue, whereas Copy C of the RRB-1099-R is green.