As part of the Ticket to Work (TTW) and Work Incentives Improvement Act of 1999, Congress directed the Social Security Administration (SSA) to test alternative Social Security Disability Insurance (SSDI) work rules designed to increase the incentive for SSDI beneficiaries to work and reduce the total amount of SSDI benefits paid to beneficiaries. In response, SSA has undertaken the Benefit Offset National Demonstration (BOND), a random assignment test of alternative SSDI program rules governing work and other supports. BOND tests a $1 for $2 benefit offset applied to annual earnings above the BOND Yearly Amount (BYA)—the annual equivalent of SSDI’s substantial gainful activity amount. As a result, beneficiaries in the treatment group are able to retain some of their monthly cash benefits while earning more than BYA. The benefit offset reduces yearly SSDI benefits by $1 in SSDI benefits for every $2 in annual earnings above BYA (in other words, reduces yearly SSDI benefits by half the amount that annual earnings exceed the BYA threshold).