Yes, Mark Cubin pays taxes. I bet Mark Cuban doesn't pay more in taxes than his tax liability. I bet Mark Cubin pays less in taxes than you think he does. I bet his effective tax rate is lower than the average American. 

I bet Mark Cubin is paying his taxes legally taking full advantage of legal tax credits and tax loopholes available to him.

So why you think Trump should be held to a different standard is beside me. So please, educate me more on the tax system since you are so knowledgeable on taxes.