Reporting part-time earnings while on benefits after 10 years as an IT help-desk technician

I picked up part-time shifts as an IT help-desk technician and I am confused about how to report them. I worked as an IT help-desk technician before this. The form asks for gross earnings, which I do not see until later. Did anyone get an overpayment notice from a mistake?

Report honestly and keep your stubs. An honest small error is much easier to fix than a missing report.

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