How do you report hours that vary week to week? - first time posting

I work some days through a staffing agency while still certifying. I would rather hear the honest version than the polite one. Sometimes my paycheck is late by a week. Who can I ask without risking my claim?

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

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.