I've never sold a bitcoin so I have no gains to report.
However, I've been mining for a year and purchased expensive computer parts to mine.
Will I be able to declare those as a business expense for tax purposes even though I didn't report any income( i didn't sell any coins)
If you are a miner, you have gains to report. Every coins you mined needs to be declared as income at the moment you mined it.
Not true. You have no financial gain until you sell. Think of Bitcoin as an inventory item. Your asset cost is the cost of equipment and power. As a business you don't pay income tax on unsold inventory...
If you own a rock quarry you don't pay taxes on all the rocks you own but haven't sold yet.