It could be before, it usually is after, and sometimes, not at all. For union work (SAG-AFTRA) here in the US, for both TV and film work, actors are required to be paid for a day’s work (or a week if they are booked for a 5-day or 8-day contract) within 10 business days of the work.
Can I wear jeans to an audition?
You don’t need to dress like you’re going in for a corporate interview here. Your clothes shouldn’t be a wrinkled mess, but you also shouldn’t be wearing business attire to an audition. A good pair of jeans can go a long way, and it’s worth investing in a pair for auditions alone.