From a recent report from Social Security’s Office of Inspector General:
From 1 segment of the Master Beneficiary Record, we identified 13,825 primary beneficiaries who submitted their applications for DIB [Disability Insurance Benefits] in FYs [Fiscal Years] 2015 and 2016, received a DIB allowance, and had a prior period of DIB or were previously denied DIB. From this population, we reviewed a random sample of 200 beneficiaries to determine whether their DIB entitlement dates were accurate.
SSA [Social Security Adminstration] employees did not accurately establish DIB entitlement dates for 23 (12 percent) of our 200 sampled beneficiaries. Employees established incorrect entitlement dates because they did not accurately evaluate all relevant evidence, appropriately identify retroactive entitlement based on prior filings, or correctly calculate one beneficiary’s insured period. As a result, we identified improper payments of $373,906 related to 23 beneficiaries ($291,076 in underpayments to 20 beneficiaries and $82,830 in overpayments to 3 beneficiaries)....
Please note that OIG is saying that far more people are being underpaid than overpaid.
“[W]e project SSA established incorrect entitlement dates that resulted in almost $657 million in DIB and SSI improper payments. After we offset the improper DIB and SSI payments, the financial impact to the sampled beneficiaries was $272,833. Therefore, we project the resulting financial impact to beneficiaries was about $377 million. ...



