Earlier quoted context omitted.
Your point seems a little orthogonal. If I pay tax on X value in year 1, value goes up and now I pay X*1.1 in year 2, then back to X in year 3 because the home value lowers again, I don’t get a refund for the extra 10% paid in year 2 despite the fact that I never realized any value in the fact that my home appreciated for a year.
So in 2020 I inherit $16k and decide to buy 1 BTC for $16,082 on Nov 12, 2020. Later that day the wealth tax department is created and levies a 20% tax on all unrealized appreciated assets. Your reporting day is on the anniversary of the original asset purchase. So a year later (Nov 12, 21) Bitcoin is at $64,400. My accumulated unrealized appreciation is $48,318. I file my wealth tax return and have to borrow the $9,…
But I'd recommend selling enough of your BTC to pay taxes so you're not underwater if it goes down in value.