Capital Gain
In simple terms
A capital gain is the money you make when you sell something for more than you paid for it. For example, if you bought a Bitcoin for $30,000 and sold it for $40,000, your $10,000 profit is a capital gain.
Definition
Profit earned when an asset is sold for more than its purchase price.
In depth
A capital gain represents the positive difference between an asset's sale price and its cost basis (original purchase price or adjusted acquisition cost). In cryptocurrency markets, capital gains are realized when a user transfers or liquidates digital assets on an exchange or peer-to-peer, converting them to fiat currency or other assets at a higher valuation. Tax treatment of capital gains typically depends on holding period (short-term vs. long-term) and jurisdiction-specific regulations, with many countries treating cryptocurrency gains as taxable income. The gain is calculated as: Sale Price minus Cost Basis = Capital Gain (or Loss if negative).
How does Capital Gain work?
A capital gain is measured against a starting number called the cost basis: the purchase price plus any fees paid to acquire the asset. While the asset is held, any increase above that basis is unrealized and exists only on paper. The gain becomes realized at disposal — selling for cash, swapping one token for another, or in many places spending it. Proceeds minus basis is the gain. Holding period is tracked separately because many tax systems treat short-held and long-held assets differently. Rules vary by country and by state, so a tax professional is the right source for a specific situation.
An example
Illustrative only. Someone buys 1 ETH for $2,000 and pays a $10 fee, giving a cost basis of $2,010. Later they sell it for $2,500 with a $12 fee, so net proceeds are $2,488. The realized capital gain is $478. If instead they had swapped that ETH directly for another token, many tax systems would still treat it as a disposal and the same $478 would be measured.
Figures are illustrative only.
What beginners get wrong
- Crypto-to-crypto swaps are frequently assumed to be tax-free, yet in many jurisdictions they count as disposals that create a reportable gain.
- Losing the original purchase records makes cost basis impossible to prove, and an unproven basis can end up treated as zero.
- Paper gains often get counted as income; nothing is realized until the asset is actually disposed of.
Related terms
Part of
What do the basic investing terms in crypto mean? — the subject page for investing basics, with all 11 of its definitions in one place.
Educational only — not financial advice.