Maybe...depends on which model of IGT or Willams slot machine you have.
Bunker, What machine(s) have this ability to do this?
I made a mistake Idesign. sorry.
Allow me to clarify...
The ICT printer that I have from an aftermarket co. (Empire Gaming Systems) that was made to adapt to the IGT S+ slot machine has the ability to print thermal tickets that round up or down to the nearest dollar amount and leaves the change/credits on the machine.
This printer unit (HCU100) was made and marketed for home use about 11 years ago from a fella in Long Island.
It's not of IGT OEM design.
Here is a link to one of these units for sale on ebaz...>>>
https://www.ebay.com/itm/IGT-S2000-Game-King-HCU-200-Hopper-Credit-Clear-Print-Ticket-No-Error-Module-Kit/113700625115?hash=item1a7915dadb:g:c88AAOSwBfRbAz4zAnyways, back to the topic! lol
I know for certain that cherrymaster type of games will allow credits to remain on the machine after cashing out a rounded up/down ticket.
This HCU100 unit above was the only thing that I knew of that can do what Robbie's asking.
In the ICT printer settings, you are allowed to move the decimal point on the printer ticket to where it would only print dollar amounts if you wanted it to.