Most people who find this page have already decided to come clean about prior years. The question is not whether, but through which door — and the doors differ in what they close, what they leave open, and who gets your name first. The wrong door cannot be reopened.
One question does most of the sorting: could the omission be called willful? Willfulness is a legal judgement about knowledge and intent, made on facts — the size and duration of the omission, what you were told, what you signed, where the assets sat. It is not a judgement you should make about yourself alone, in either direction. People talk themselves into "it was obviously innocent" and into "I'm going to prison" with equal ease, and both are usually wrong.
The three doors
Amend — Form 1040-X
Fits when: the error was non-willful, the years are few, the amounts are explainable, and no notice has arrived.
What it is: a corrected return with the tax and interest paid. Accuracy-related penalties may apply; reasonable-cause relief may be available.
What to understand: an amendment is a signed statement that the original was wrong. That is fine when it was a mistake. It is a problem when it wasn't.
Quiet disclosure — amending without saying why
Fits when: practitioners are split on whether it ever does.
What it is: filing amended returns and hoping they are processed without attention.
What to understand: the IRS has said it does not regard this as a sanctioned path, and it removes no criminal exposure — the signed amendments simply document the prior omission. Whatever else is true, this is not a door to choose alone.
Voluntary Disclosure Practice — the formal route
Fits when: willfulness is arguable, the amounts are large, or the years are many.
What it is: pre-clearance with IRS Criminal Investigation, then a disclosure covering the lookback period, with a civil fraud penalty applied to one year and, in exchange, a practice of not recommending prosecution for the disclosed conduct.
What to understand: it only works before the IRS has your name from another source. An exchange that has complied with a John Doe summons may already mean it does. Timing is the whole value of this door.
The shape of the arithmetic
On the same facts, the three doors differ less in tax — the tax is the tax — and mostly in penalties and protection. Amendment carries the accuracy-related penalty and no protection. Quiet disclosure carries the same penalty and the same non-protection, minus candour. VDP carries a heavier one-year fraud penalty and the protection that is the entire point.
Anyone selling you a cheaper number without asking the willfulness question is answering the wrong question.
Sequence matters more than speed
If a notice is already in hand — a CP2000, a 6173 — respond to that clock, but decide the disclosure question before drafting the response, because the response is a signed statement and it fixes your story. If no notice has arrived, the order is: assess willfulness with a representative, check whether your exchanges appear on the summons list, then choose the door. Documents are sent once, in the right order, or they are evidence.
What to bring to the first conversation
Years affected; rough gains or income per year; where the assets sat (which exchanges, which wallets); what was reported, if anything; every letter received; and how the position came to be — who told you what, when. That conversation is privileged with an attorney, and can be structured to be, which is itself part of the decision.
Willfulness is a legal judgement made on facts this page does not have. It frames the decision; it does not make it, and reading it creates no professional relationship.