They will immediately exchange the bitcoin to fiat regardless. It's tax money, they want it to spend it immediately, so it has to be fiat.

Same thing that Liechstenstein announced recently, by the way.

It's a fucking scam anyway. Why would you pay taxes in ever-appreciating, absolutely scarce BTC instead of ever-depreciating, infinitely printable fiat? It's like using your house or your land to pay taxes.