I can understand where your coming from, but personally I want to leave no stone unturned, when it comes to maximizing my profits.
The United States taxes BTC as a capital gain, I believe. The price of BTC when you receive it is important. If you ignore that number, they will tax you at it's price when you convert, instead of when you received. As of right now the price is around $7000usd. Long term miners, like myself, do not convert at this price. Unless Forced too. Cashing out rewards at this price is going to be a waste of profit.
.US only worries about Bitcoin as a capital gain if you are TRADING in BTC. IOW, if you buy 1 bitcoin for $US6000, and sell it for $US7000, that is a gain of $US1000 when you sell it, not before. But if you MINE 1 bitcoin for that is 1 BTC of pure income. Not the same. If you sit on that mined bitcoin until it is worth $US10000, and sell it, that is pure income of $US10000, but not until you exchange it for USD. IOW, the price in US$ of BTC when you actually acquire it has no effect on your cost to acquire.
The actual direct cost to mine BTC is zero, it is found money. I bought my miners with USD, and I pay my electricity bill with USD. I can deduct those expenses against my mining revenue, but only after the revenue is converted from BTC into USD, regardless of what the price was at the time I "found" the bitcoin. Hopefully I can continue pay the bills from other sources until the BTC price increases to something worthwhile.
The BTC cost for MINING is likely zero. The cost for TRADING is whatever you paid and sold it for in US$. If you are doing both mining and trading, my suggestion would be to keep separate wallets for each activity.