You can get into serious trouble with the IRS if you don’t declare all your income and pay taxes on it, including stiff financial penalties and potential criminal penalties such as prison time. You may need to respond to a couple items on your annual tax return, depending on your activities.For all taxpayers, the IRS asks you whether you’ve transacted in cryptocurrency each year on your Form 1040 tax form. So if you’ve bought or sold cryptocurrency during the tax year, you’ll need to declare that on your taxes – or risk lying on your return.In addition, if you’ve turned a profit on your crypto trades, you’ll need to report that capital gain and pay taxes on it. Alternatively, if you’ve lost money on your trades, you can claim a loss as well as a tax break.