I began receiving social security in Apr 2018, and when I signed up the agent talked me into taking it retroactively, back to Dec 2017 when I first applied. So on my history online, there is a one-time payment for Dec 2017, and a one-time payment for Jan-March 2018, with the regular payments starting in April 2018.
Is this lump sum what they are referring to when they ask if you received a lump sum attributable to previous year, and if so, should I have received a separate statement from Social Security?
