@Ben2bs
If you have even a rough idea of how much you received during the year, you should be able to tell whether you have to add the two forms together, or if one of them represents the total benefits that you received.
Did the type of benefits change during the year? For example, did it change from disability benefits to retirement benefits because you reached retirement age? If so, you have to add the two forms together. Box 8, at the bottom right of the form, has your Social Security number followed by a suffix or code. If the suffixes are different, this is probably what happened.
If you're not sure, call Social Security at 800-772-1213 and ask them why you got two SSA-1099 forms. The SSA web site says "Wait times to speak to a representative are typically shorter in the morning, later in the week, and later in the month."
