A late-August 2026 audit by the Social Security Administration's Office of the Inspector General reported that several hundred million dollars in disability benefits were owed to beneficiaries but never paid, the latest in a long-running series of watchdog findings that document underpayments alongside the better-known problem of overpayments. For SSDI claimants, the underpayment story is just as important as the overpayment one — and it is much less discussed.

What the OIG identified

The August report focused on disability beneficiaries whose records showed retroactive or continuing payments that SSA's payment systems had not actually issued. The underpayments traced back to familiar processing failures: SSA approved a claim but the payment system did not generate the correct retroactive check; a cost-of-living adjustment was miscalculated and the correction was made internally but never sent; an income or earnings record was updated in one SSA system but did not sync with the payment system that produces the monthly check. The dollar total is large in part because SSA pays more than a trillion dollars a year in total benefits, and even a small percentage error rate applied across that base produces nine-figure swings.

Why underpayments keep happening

Most underpayments are the product of SSA's fragmented computer systems, several of which were built in the 1970s and 1980s and have been patched rather than replaced. The system that calculates the benefit amount is not the same system that produces the monthly payment; the system that records work history is not the same system that decides whether a continuing disability review is required. When the seams between these systems fail to update in sync, the most common failure mode is that the agency owes more than it pays. The overpayment story is more visible because it generates letters and demands for repayment. The underpayment story is largely invisible, because SSA does not send a notice when it should have paid and did not. Most underpayments surface only when the beneficiary notices an inconsistency and asks SSA to trace the payment.

What claimants can do

The most useful thing an SSDI beneficiary can do is keep their own record of what they have been told. The Notice of Award should specify the monthly amount and the effective date. A COLA should appear in the December or January check. A Medicare premium deduction should match what Medicare charges. Any discrepancy is worth raising with SSA through the field office or the national 800 number. If SSA confirms an underpayment, the agency owes the difference plus interest in most cases, paid as a single lump sum. Beneficiaries who maintain their own audit trail against the agency's notices are the ones who surface and resolve these errors most reliably.