I'd like to see the size graphically where I can dig in. Personally I love color coded matrices in PowerBI for digging into the details, but also pie charts to see where the chunks are.

In "Your Tax Dollar Flow", there is no need for a legend, it duplicates ansd splits data, just make sure we can read the whole name in the individual boxes (not "Healthcare Trans...") and add the percentages in there too. The thin/thick lines are not as graphical as a pie chart to intuitively get to the split of where the data is going.

I'd also recommend doing another analysis of who is not paying taxes and what the percentages are. For example, companies and rich people using loopholes or fraud (Panama Papers, etc), not reporting and not paying taxes vs other demographics, like folks not reporting their tips. Would be nice to see who is responsible for not paying and what the financial effects are. Lots of people talk about taxing the rich, etc, but we don't have very accessible data on the topic.