Anything you get paid for beyond moving the freight.
Detention, layover, TONU, extra stops, driver assist, tarping, lumper reimbursement, reconsignment. Each is a separate line you have to have agreed and then have to collect.
Accessorials are the most commonly lost revenue in small-carrier billing. The work is done, the money is owed, and nobody invoices it because the paperwork got away.
Related
Inteleri works out what a load actually pays you once things like this land. See how it works.