Reporting part-time earnings while on benefits, sales associate here

I work some days through a staffing agency while still certifying. It has been weighing on me all week. Sometimes my paycheck is late by a week. Do you report when you earned it or when you were paid?

I estimated and then checked my pay stub. When there was a small difference I wrote to the agency to correct it.

The claimant handbook has worked examples for part-time pay. Mine was clearer than the phone line.