Do I need to pay taxes if I sell an alt coin for bitcoin then rebuy a different alt coin. I never took out actual USD so I am unsure how that would work. Or am I only taxes on actual USD made when I cash out?
It could be possible that a portion of the fees you paid when you did the buying and selling will go to the taxes that are paid by the exchange platform. That is, if the platform itself is duly registered in the country it is operating. You might not be paying taxes directly, only indirectly. If you cash out, it is basically the same rules. Very seldom, if at all, will you encounter directly paying taxes every time you do cash outs. That would probably be shouldered by the company using the fees you are paying.