Pay periods run from the 1st -15th (paid on the 21st) and the 16th - end of the month (paid on the 6th of the following month). This is because it takes 6 days from the end of a pay period for invoices to process into PayPal. If your payment hasn't shown up by end of day (Pacific time) on the 6th or 21st, please let us know by filing a support ticket.