It does make tax collection harder, which historically leads to fairer taxes.
Value added tax is the least shit I think, and easiest to collect if everyone was using bitcoin.
Discussion
But that's not the point of op
Taxes are very interesting.
This is good, by our quirky bitcoin pal: 
Nah, VAT is a gigantic pain in the ass, and very invasive. It forces you to keep lots of records and disclose lots of data that you otherwise would not have to.
Property tax has the advantage of being applied to something that inherently isn't very private: the fact that land is owned.
Does it? That's fiat thinking.
With mocropayments this can be done at point of sale.
In our bitcoinised future.
While we are at it, you could elect what department of gov those sats land from your wallet (10% military, 40% education etc), then every transaction becomes act of direct democracy.
We can but dream..
Unless there are huge amounts of invasive auditing records attached to that, it's a donation.
If there are, this is a pain in the ass to administer. No different than VAT now.