On your Swan Bitcoin settings page, we provide a CSV export of your purchases along with dates and cost basis. It is currently exportable directly into a variety of automated crypto-tax software systems, including Cointracker.io. It can also be provided to your accountant for analysis of taxable events.
Taxable events generated within your Prime Trust custodial account (like sales of Bitcoin) may result in the issuance of a 1099-B form from Prime Trust, who will email you directly.
The IRS has produced a list of Frequently Asked Questions regarding cryptocurrency.