None that I can remember upon reading some of his posts and interactions with other notable figures in bitcoin. From the looks of it, Satoshi seemed to be that anti-government guy that wants things to stay clear of government intervention and control that's why he created bitcoin. Also, his views are mainly crypto-anarchism, so that per se explicitly states that he will never ever support taxation in any way or form.
The main purpose on why Bitcoin is created where to be freed out on the chain of government rules when it comes to finances.So most probably he doesn't mind about taxation or any related things.
If he's still alive now,he might already anticipated for this possibility for government to interrupt into its creation.Its inevitable though if we look deep through because government does really like to get involve into things which do opposes it.