If 6.9 million was only 17.4% of his "taxable income" (which, I take to mean his total income minus an inordinate amount of deductions), then his "taxable income" was north of 39 million. How about he sends in 20 billion? That would be less than 1/2 his net worth, leaving him 25 billion to help him through the tough times. I'm sure if he tries really, really, really, hard and tightens his belt a little, he can somehow survive on 19 million for the year. Seriously, these numbers would be laughable if they weren't so obscene.
Edit: Confusion of ideas. Too busy at work.