Teller Assist Units (TAU), also known as Automatic Teller Safes (ATS) or Teller Cash Dispensers (TCD), are devices used in retail banking for the disbursement of money at a bank teller wicket or a centralized area. Other areas of application of TAU include the automation of starting and reconciling teller or cashier drawers (tills) in retail, check cashing, payday loan / advance, grocery, and casino operations.

Cash supplies are held in a vault or safe. Disbursements and acceptance of money take place by means of inputting information through a separate computer to the cash dispensing mechanism inside the vault, which is similar in construction to an automatic teller machine vault.

A TAU provides a secure and auditable way of handling large amounts of cash by tellers without undue risk from robbery. Some TAUs can be networked and monitored remotely, from a central location - thereby reducing oversight and management resources.