Social Security Work Incentives Act of 1988

Social Security Work Incentives Act of 1988 - Amends title II (Old Age, Survivors and Disability Insurance) (OASDI) of the Social Security Act to reduce monthly disability benefits by 50 percent of a beneficiary's monthly earnings in excess of $85. Limits the total amount by which an individual's OASDI disability benefits may be reduced if such individual is also eligible for benefits provided under title XVI (Supplemental Security Income) (SSI) of the Act to individuals who perform substantial gainful activity despite severe medical impairment.

Prohibits deductions from disability-based child insurance benefits for the recovery of prior overpayments resulting from a failure to reduce such benefits on the basis of earnings.

Extends to current OASDI disability beneficiaries the rule preventing reductions in the primary insurance amount for prior recipients.

Continues an individual's entitlement to disability benefits while such individual is under disabled and working status, meaning that such individual is earning enough to be considered engaged in substantial gainful activity, but would otherwise continue to satisfy eligibility requirements. Sets a four-year limit on the Medicare hospital insurance eligibility (under part A of title XVIII of the Act) of individuals who owe their eligibility to their disabled and working status under the OASDI program. Amends the Medicare program to authorize such individuals to enroll for hospital insurance benefits upon the termination of such four-year limit.

Amends title XIX (Medicaid) of the Act to cover Medicare cost-sharing amounts for individuals of disabled and working status who are entitled to enroll for Medicare hospital insurance benefits and whose income and resources do not exceed 300 percent of the Federal poverty level and the SSI resource eligibility limit, respectively. Requires States to collect a coinsurance percentage from such individuals pursuant to a sliding scale which increases such percentage from 0 to 100 percent in reasonable increments as incomes move from 150 to 300 percent of the Federal poverty level.

Extends to all recipients of disability-based child's insurance benefits the rule permitting continued entitlement to Medicaid benefits of individuals who would remain eligible for SSI benefits but for their receipt of such child's insurance benefits.