Crypto Taxes Basics: Taxable Events, Records and Cost Basis

Events that are often taxable

In many countries, what matters for tax is the moment you dispose of crypto or receive it as income, not the moment its price goes up. Common examples include:

• Selling crypto for regular money, such as dollars or euros.
• Swapping one crypto for another. Many tax systems treat a swap as selling the first coin and buying the second, even though no regular money changed hands.
• Spending crypto on goods or services, which is often treated like selling it at its value at that moment.
• Receiving crypto as income, such as staking rewards, mining rewards or payment for work. In many countries these count as income based on their value when you receive them.

Some actions are usually not taxable on their own, such as buying crypto with regular money and holding it, or moving coins between wallets you own. The treatment of airdrops, lending, liquidity pools and gifts varies widely and is still evolving in some places.

Cost basis and gains

Your cost basis is what an asset cost you for tax purposes. A gain or loss is generally the difference between what you received when you disposed of it and your cost basis. In many systems, fees paid when buying can be added to the cost basis and fees paid when selling can reduce the proceeds, but check your local rules.

Here is a hypothetical example. You buy one coin for $1,000 and pay a $10 fee, so your cost basis is $1,010. Later you sell it for $1,500 and pay a $15 fee, so your proceeds are $1,485. Your gain is $1,485 − $1,010 = $475.

Swaps work the same way. If you swap a coin with a cost basis of $500 for another coin worth $800 at that moment, you may have a $300 gain to report, and the new coin's cost basis may start at $800. Income follows a similar logic: staking rewards worth $20 when they arrive may be taxed as $20 of income, and that $20 may then become the cost basis of those coins when you later sell them.

If you bought the same coin several times at different prices, countries use different methods to decide which purchase you sold, such as first in, first out or an average cost. The method can change your result, so use the one your tax authority requires.

Losses count too

If you sell or swap a coin for less than its cost basis, you usually have a loss. Many tax systems let you use such losses to reduce taxable gains, and some allow unused losses to be carried forward into later years. Others set limits or have special rules, for example for buying back the same asset soon after selling it.

Coins lost to a scam, a hack or a collapsed platform are a harder area. Some authorities allow a claim in certain situations and others do not, so this is a case where professional advice is especially worthwhile.

Keep good records from day one

Rebuilding years of trades later is painful, and exchanges can close or stop offering old data. Keeping your own records as you go is the simplest protection. For every transaction, note:

• The date and time.
• The type: buy, sell, swap, spend, transfer or income.
• The coin and the amount.
• The value in your local currency at that moment.
• Any fees paid, and in which coin or currency.
• The platform or wallet involved, and the transaction ID if there is one.

Download exchange statements regularly and store them somewhere safe. Many people use crypto tax software that imports this data, but check its results, especially for transfers between your own wallets, which software can mistake for sales.

Where to get reliable answers

Crypto tax rules differ widely: what counts as income, whether holding for longer changes the treatment, whether small amounts are exempt, and how losses work. They also change as governments update their guidance and introduce new reporting rules for exchanges.

Your national tax authority's website is the best starting point, and a tax professional who understands crypto can help with anything complex. Late or incorrect reporting can lead to penalties and interest, so it pays to ask early rather than after a deadline.