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You should consult your tax professional to figure this out.

Generally speaking, in the U.S., you will want a Form 8949 (Sales and Other Dispositions of Capital Assets) complete with your cryptocurrency transaction history, a summary of your overall capital gains (across all assets) on your Schedule D (Capital Gains and Losses), and then your Form 1040 (Individual Income Tax Return).

Additionally, if any of your cryptocurrency assets were lost or stolen, you will want to complete Form 4684 (Casualties and Theft — note this is only allowed before 2018). If you held $10,000 or more on a foreign exchange (non-US based) at any time during the tax year, you need to file a FBAR. If you held more than $75,000 on a foreign exchange during the tax year, then you must additionally file a Form 8938 (Statement of Specified Foreign Financial Assets, a.k.a FATCA) if, on a foreign exchange, you held either more than $75,000 (at any time during the tax year) or more than $50,000 (on the last day of the tax year). If you underpaid your quarterly taxes for capital gains, then you will want to complete a Form 2210 (Underpayment of Estimated Tax by Individuals, Estates, and Trusts).

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