Question about mining zcash or other coins. When mined and sold right away how do you calculate tax. I don’t want to hold coins for massive profit just sell when mined.

I can’t get a straight answer. I know if you hold coins for a profit you need to declare. But if I mine a coin on a day it’s $200 and sell for USD $200 how much tax is taken from me. I don’t want to hold I would transfer straight to bank to pay rent etc.