How do you report hours that vary week to week? after 7 years as a bank teller

I picked up part-time shifts as a bank teller and I am confused about how to report them. 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.

Keep everything in writing and save the confirmation numbers. It saved me later.