Elon Musk is tweeting again, despite meant to keep him in check. This time he’s talking fiscal policy, focused around a proposal that would for people like him. The rule change could stick Elon with a $10 billion annual tax bill, and he’s none too happy about it.

Let’s start with a quick primer on the proposed change. Senator Ron Wyden of Oregon has suggested an update to the current tax code, one that would affect long-term capital gains taxes for millionaires and billionaires. Currently, capital gains (an increase in value of something you own — real estate, stocks, pogs) are taxed as income if you own that property for less than a year. After a year or more, they’re taxes as “long-term capital gains” — a category that’s capped at a 20% tax.

No matter the tax rate, capital gains taxes are only incurred when you sell the relevant holding. If your stocks triple in value, but you and your , you won’t incur any tax. That’s what Sen. Wyden’s proposal wants to change: Adding a tax on unrealized capital gains, to be treated as regular income, for top earners.

Elon Musk, , would be one of those top earners. A notorious and dedicated , Musk spoke out on Twitter against the proposed change:

Musk’s use of the classic “” line is truly some -level irony, given that Tesla and SpaceX are directly funded by those same government coffers. As of 2015, Tesla, SolarCity (then still an independent company), and SpaceX had raked in in subsidies and tax credits.

Of course, the money didn’t stop there. 2015 was before Tesla’s Austin factory, and its . It was before the construction in Berlin, which comes with a cost to the German government that . Musk follows government money, vacuuming it up wherever he can — ten digits’ worth so far, with more on the horizon.

With such a heavy reliance on subsidies for SpaceX and Tesla, Musk really isn’t in a position to complain about taxes — after all, he’d be nowhere without them. The system that’s funded his factories, rockets, and tunnels needs to recoup those payouts somehow. Maybe he expects cryptocurrency to — or maybe, paying taxes is some good advice Elon just can’t take.