Taxpayers with gains or losses must detail their gains and losses across a few different forms. The most granular of these forms is the IRS Form 8949.
Form 8949 captures the details of every sale triggering a gain or loss. The details supporting the final calculation, include, but are not limited to, asset identity, date acquired, date sold, proceeds, cost basis, short versus long term, and gain or loss.
Form 8949 must consolidate all transactions that feed into the Schedule D: capital gains/losses, across securities and crypto transactions the go onto Form 8949. Users can prepare as many Form 8949s as they want; they all roll up to a Schedule D.