A taxable event is a transaction or activity you're required to pay taxes on.

• A taxable event in one country might not be one in another. 
• Typically, transactions involving the sale of commodities, investments, and other capital assets are all taxable. 
• Selling or trading your crypto is likely to be taxed.

A taxable event will leave you with capital gains (profit) or capital losses. 

• If an asset you're holding appreciates and you trade it at a profit, you've made capital gains. 
• If you trade or sell that asset at a loss, you've incurred capital losses.

Generally speaking, taxable events include:

1. Selling cryptocurrency for fiat
2. Trading cryptocurrency for another cryptocurrency (e.g., BTC for ETH).
3. Spending cryptocurrencies. In jurisdictions including the US, UK, Canada, and Australia, directly spending your crypto on goods or services can incur taxes if you made profits.
4. Receiving cryptocurrency as a result of a fork, airdrop or mining.

1. Buying cryptocurrency with fiat currency (except in cases where the purchase price is lower than the fair market value of the purchased coin).
2. Donating cryptocurrency.
3. Gifting cryptocurrency under a specific limit.
4. Transferring cryptocurrency from one wallet you own to another wallet you own.

If you've bought crypto, HODLed, and sold it later, your tax liability should be fairly easy to calculate. Let's look at a simplified, US-based example. 

Here's the formula:

• Fair market value - Cost basis = Capital gain / Loss
• The fair market value is the current spot price you'd find on an exchange. 
• Cost basis is the original price you paid for the asset plus any fees.

Imagine you bought 2 BTC for $10,000 and sold them two years later for $30,000. You've now made $40,000 in capital gains: $60,000 (fair market value) - $20,000 (cost basis) = $40,000 (capital gains)

• Tax authorities such as the IRS, ATO, CRA, HMRC, and others track cryptocurrency transactions and enforce tax compliance. 
• Large cryptocurrency exchanges
• Governments use data analytics tools such as Chainanalysis to pinpoint cryptocurrency users. 
• The IRS and other tax authorities also partner and share data with other governmental bodies, academic institutions, and international governments to share information about cryptocurrency usage.

In many countries, tax authorities require you to file your taxes regularly. 

This can be the case even if you owe zero taxes or need a refund. Failure to file can result in fees, penalties, interest, confiscated refunds, audits.

Getting your taxes right is essential. 

• That’s why it's recommended to get professional help calculating your tax bill if you have any doubts. This may be the case if you’ve been trading and not just investing. 
• The tax implications of regular trading are much more complicated. But most importantly, your situation for tax purposes is highly dependent on where you live. 
• Make sure to use all this information with that in mind.