Reporting part-time earnings while on benefits - 14 months and counting

I picked up part-time shifts as a barista and I am confused about how to report them. I worked as a barista before this. The form asks for gross earnings, which I do not see until later. Do you report when you earned it or when you were paid?

Thanks for writing this out. I went through something close to it 14 months ago, and it settled down once I kept a simple log of every call and form.

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