I went to the soc sec office to report a change (someone moved out) and then I was told they were doing a redetermination for my son's SSI. I told them I didnt have the figures in front of me, I was guessing. When I got home and checked my figures were off (low) by about $130 for my sons share Do I have to go back into the ofc and do a new redetermination right away?
I can't tell from your description whether or not the difference you mention is material. If you think it might have an effect on your son's SSI payments, you will likely want to re-contact the worker you spoke with as soon as possible.