Your PIA is your "Primary Insurance Amount." That is the Social Security term for the amount of your monthly benefit, should you retire or become disabled.

Your PIA depends on how much you have paid into the system. Social Security has a complicated formula to calculate it. In general, sporadic workers may have a disability PIA below $700. Solid earners may be higher than $1,800 per month. Most people are in between. SSI recipients have a different monthly benefit.

If you want to know your PIA, check your annual Social Security statement.