¶ 3201
Overview
Scope of the chapter. This chapter examines the rules that require information about digital assets held or transacted across borders to be reported to tax authorities. Two families of rules are involved. The first consists of multilateral standards under which service providers report to their own tax authority and that authority exchanges the information with the tax authorities of the jurisdictions where the customers are resident: the OECD Crypto-Asset Reporting Framework (CARF), the Common Reporting Standard (CRS) as amended in 2023, and the European Union's implementation of both through the eighth amendment to the Directive on Administrative Cooperation (DAC8). The second consists of the unilateral United States regimes under which a United States person reports foreign holdings directly to the federal government: the Report of Foreign Bank and Financial Accounts (FBAR) under the Bank Secrecy Act, the statement of specified foreign financial assets on Form 8938 under I.R.C. § 6038D, the foreign trust and foreign entity returns, and the chapter 4 regime known as FATCA, which places reporting obligations on foreign financial institutions themselves. The chapter explains each regime, identifies how it applies to tokens held on foreign platforms and in self-custody, examines the penalty structure, including the Supreme Court's decision in Bittner v. United States, and closes with a compliance map and checklist.
Relation to other chapters. Domestic broker reporting under I.R.C. § 6045 and Form 1099-DA is the subject of ch. 31, and the income tax rules that determine what the reported information means are in ch. 30. The anti-money-laundering obligations of service providers, which share vocabulary and some data with the tax reporting regimes, are in ch. 33, and the travel rule is in ch. 34. Foreign trusts and foundations that hold digital assets are discussed in chs. 15 and 18; this chapter addresses only their reporting. The European Union's market regulation under MiCA, which supplies several definitions DAC8 borrows, is examined in ch. 38.
Why the subject matters. Before 2026 the international exchange of tax information reached digital assets only at the edges. The CRS applied to Financial Accounts held at Financial Institutions, and a token held in an exchange account, or in a wallet whose keys the owner controlled, often fell outside it. The United States FBAR regulations did not treat a foreign account holding only virtual currency as reportable, and FinCEN said so in a 2020 notice. Form 8938 instructions have not addressed digital assets at all. From January 1, 2026, the position changed for most of the developed world. The United Kingdom and the member states of the European Union began requiring crypto-asset service providers to collect self-certifications and record transactions for exchange in 2027. Forty-six jurisdictions have committed to first exchanges by 2027, twenty-seven by 2028 and four, including the United States, by 2029. A client who holds tokens on a platform in any of those jurisdictions should expect that platform to report the client's identity, tax residence and annual transaction totals to its tax authority, and that authority to send the information to the client's home jurisdiction.
Three questions. The analysis of any client's position proceeds through three questions, which organize the chapter. First, which service providers stand between the client and the assets, and in which jurisdictions do they have a reporting nexus? The answer determines what will be reported about the client without the client's participation. See ¶¶ 3220 and 3230 infra. Second, what must the client report directly, given the client's citizenship, residence and the form in which the assets are held? For a United States person the answer turns on the FBAR rules, § 6038D and the entity and trust returns. See ¶¶ 3260 and 3270 infra. Third, what is the client's exposure for past failures? How is it best resolved? See ¶ 3280 infra.
The self-custody gap. All of the multilateral regimes report through intermediaries. CARF reaches a Reporting Crypto-Asset Service Provider; the CRS reaches a Financial Institution; FATCA reaches a foreign financial institution. A person who holds tokens in a wallet whose keys the person controls, and who transacts directly on a public ledger without an intermediary, is outside the scope of each regime for those holdings. CARF responds in part by requiring service providers to report the aggregate value of transfers their customers make to wallet addresses not known to belong to a service provider or financial institution, and to retain the addresses. See ¶ 3230.07 infra. The movement of assets into self-custody is therefore visible in aggregate, and the address is available to a tax authority that asks for it. The unilateral United States regimes are less clear. Whether self-custodied tokens are specified foreign financial assets for Form 8938, and whether a wallet is an account in a foreign country for the FBAR, are discussed at ¶¶ 3260.04 and 3270.05 infra.
Terminology. This chapter uses the defined terms of each regime when discussing that regime: Crypto-Asset, Relevant Crypto-Asset and Reporting Crypto-Asset Service Provider (RCASP) for CARF; Financial Institution and Financial Account for the CRS; foreign financial institution and financial account for FATCA; specified foreign financial asset for § 6038D; and bank, securities or other financial account for the FBAR. The general term "digital asset" is used as defined in ch. 1. See ch. 1, ¶ 110. Where a regime's term and the general term diverge, the text says so.
Status of the law. The law is stated as of November 2026. Several elements are in transition. The United States had not published proposed regulations to implement CARF as of this writing, although the Treasury's regulatory agenda had listed them. FinCEN had not published the FBAR amendment it announced in 2020. Twelve member states of the European Union had not transposed DAC8 by the deadline. The IRS had proposed revisions to its voluntary disclosure practice and taken comments. Each of these points is identified where it arises, and the reader should confirm the current position before advising.