Most bitcoin miners focus on the mining side of the tax equation – depreciation, deductions, entity structure. But there’s a second tax event that’s just as important: what happens when you sell your mined BTC.

Understanding bitcoin capital gains tax and how long you hold can save you tens of thousands.

Two Taxable Events, One Coin

When you mine bitcoin, you’re taxed on the fair market value at the time of receipt (ordinary income). When you later sell that bitcoin, you’re taxed again – on the difference between your sale price and your cost basis.

Your cost basis is the fair market value on the day you mined it. If you mined 0.1 BTC when bitcoin was at $80,000, your cost basis is $8,000. Sell when BTC hits $100,000 and your gain on that 0.1 BTC is $2,000.

The 12-Month Line That Changes Everything

The IRS draws a hard line at one year:

• Held less than 12 months: Short-term capital gain, taxed at your ordinary income rate (up to 37%)
• Held more than 12 months: Long-term capital gain, taxed at preferential rates (0%, 15%, or 20%)

For many miners, the long-term rate is 0% or 15%. The difference between paying 37% and 0% on a $50,000 gain is $18,500. That’s real money lost by selling too early.

Yes, 0% Long-Term Gains Is a Real Thing

In 2025, single filers with taxable income up to $48,350 pay 0% on long-term capital gains. Married filing jointly? Up to $96,700.

This is where it gets good for miners: if your mining deductions (depreciation, hosting, management fees) bring your taxable income below these thresholds, your long-term bitcoin capital gains tax could be entirely zero.

Mining deductions and holding strategy work together. The depreciation reduces your ordinary income, potentially putting your long-term gains into the 0% bracket.

How to Play It

The most tax-efficient approach looks like this:

1. Mine bitcoin through a properly structured LLC
2. Claim deductions (depreciation, hosting, management fees) to reduce ordinary income
3. Hold mined BTC for at least 12 months before selling
4. Time sales to take advantage of lower long-term capital gains brackets

The combination of mining deductions reducing your income and long-term gains being taxed at preferential rates is what makes bitcoin mining one of the most tax-efficient ways to acquire BTC.

But the timing has to be intentional. Selling mined bitcoin in the same year you mine it – especially a big year – means short-term rates stacked on top of elevated income. Holding past 12 months is one of the easiest wins in this game.