That's not a guarantee of winning online. Percent paybacks on penny machines might range from the mid-80s to low 90s in live casinos, but often hit the mid-90s online. jurisdictions, paybacks tend to be higher online than in live casinos. You can use available information as an approximation of where to get the best deal, but you have to understand how percentages are calculated, what published reports tell us and what they DON'T tell us.īefore launching into explanations, there's one important point players with access to online slots should know. Online casinos don't advertise payback percentages on individual slots. Unfortunately, only rough guidelines to which machines are the highest payers are available to the public. Zeroing in on slot machines with the highest payback percentages is a key to how to win at slots.