What if an SSI/SSDI beneficiary gets a job and earns over the allowed limit and has to pay back money over time? Should they cut back on what they earn, quit, or what should they do?

First, here is some information about overpayments and how to help prevent them in the future: Avoiding and Managing SSI/SSDI Overpayments. Reporting earnings is absolutely essential to prevent overpayments. SSA has some options for requesting waivers of overpayments and can set up payment plans if they deny the waiver request. 

Deciding whether to quit or cut back their hours depends on the person’s circumstances. No matter what, they need to report their earnings. Those earnings will impact SSI and SSDI differently (read some basic information about SSA Work Incentives). For some people, they can earn a lot more income by working and if they are feeling well and are able to work, that is probably what they should do (their decision!). For others, the stability of their SSDI payment is important and so they work under SGA each month to keep their benefit. Ultimately, I would recommend that they talk to a Benefits Counselor to discuss their options.