What sort of depreciation models are you guys using for your miners? When I first started I came up with an exponential formula to depreciate each miner monthly by 10% each month from it's previous month NBV rounded up to the nearest $25. This would make each miner fully depreciated around 2 years which I figure is close to the working life of a miner. I was also trying to find a balance between difficulty and BTC price, but since I came up with that formula the BTC price has exploded so I'm thinking of possibly changing me deprecation model and interested in what other are doing.
Mining is a one process of bitcoin system and it's a transaction process like selling and buying are the work in this and to the bitcoin mining tax is not bad because it's going to government so this are taxes mining Bitcoins.