Plain English
Cost basis is what you paid for a crypto asset, including fees, in your home currency. When you sell, swap, or spend it, your gain or loss is sale proceeds minus cost basis. Every taxable disposition requires you to identify the basis of the specific units being sold.
How it actually works
Each acquisition lot has its own basis: 0.1 BTC bought at $50K in 2022, 0.2 BTC bought at $80K in 2024, 0.05 BTC received as staking reward at $90K in 2025. When you sell, you must identify which lot is being sold — FIFO by default, but specific-identification methods (LIFO, HIFO) can be elected if records support it.
What it means for you
For HNW positions accumulated over years, cost-basis tracking is the single most important tax-record discipline. Tools like Koinly, CoinTracker, and TaxBit aggregate from exchanges and wallets. Without clean basis records, you risk paying tax on the entire sale proceeds rather than just the gain — a multiple-six-figure mistake at HNW scale.
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Educational content only. Not investment, tax, or legal advice.