Using the information provided by third-party systems — such as crypto exchanges and payment systems — the IRS has been able to determine the amounts traders owe and included the amounts in dollars in the notices. Individuals who have received these notices are required to pay within 30 days, starting on the delivery date indicated in the letter.

If you think the exchange — on which you traded — provided your details to the bureau, you are probably right, but do not hold it against the exchanges. The regulation stipulates that all broker and barter exchange services are required by law to annually report trader activity on a 1099-B form, send it directly to the IRS and send a copy to the recipient.