# CARF in Practice: What Tax Authorities Will See About Your Crypto in 2027 > CARF in practice: who is an RCASP, which exchange and transfer aggregates are reported, why wallet balances are not, the 2027/2028 waves, DAC8 and 1099-DA. Author: Дана Берзег — адвокат, Family Office (https://wiki.private.law/authors/berzegova) Last modified: 2026-07-30T16:50:00.000Z Canonical: https://wiki.private.law/en/carf-practice Topics: investments Jurisdictions: global Semantic tags: tax-regime, crypto-friendly --- By 2027 tax administrations will have something they have never had before: an annual picture of an individual's crypto-asset activity, arriving not on request and not through a leak, but down a routine automatic-exchange channel. The mechanics will feel familiar from CRS, but the object is fundamentally different — not a balance on an account, but a year's worth of transaction flow. And the inspector will read that flow sitting next to your return for the same period. We covered the general theory of automatic exchange separately, in the [CRS overview](https://wiki.private.law/en/crs-overview); the infrastructure context, from custody to stablecoins, is set out in our piece on [crypto for private wealth](https://wiki.private.law/en/crypto-private-wealth). What follows is purely operational: who exactly reports, which fields go into the file, which fields are missing from it, when this happens across the jurisdictional waves, and what a capital holder should do with the time that is left. One point is worth fixing at the outset: CARF is not "CRS for crypto" in any literal sense. It is a differently engineered instrument, and it is the engineering that determines what the tax authority will see — and what it will have to reconstruct for itself. ## Who reports: the RCASP and its jurisdictional nexus The obliged party under CARF is called a Reporting Crypto-Asset Service Provider, and it is defined not by licence but by function: any individual or entity that, as a business, provides a service effectuating exchange transactions in crypto-assets. HMRC's manual spells the list out: exchanges and intermediaries, brokers and dealers, crypto ATM operators, and participants in decentralised venues wherever there is an identifiable operator, following the FATF logic for VASPs. A pure software or hardware provider falls outside the definition. The link to a jurisdiction works as a cascade: the provider's tax residence, then incorporation or other legal personality carrying tax obligations, then place of management, then regular place of business, and finally the branch through which the transaction was effected. The hierarchy exists precisely so that one venue does not report twice in two countries. The practical takeaway for a client: what matters is not the shop window of the website but where the provider is incorporated and from where it is managed — that country will be the sender of your file. You become a Reportable Person if you are a tax resident of a jurisdiction with which the provider's country has activated exchange. This is established through self-certification at onboarding and a cross-check of that form against the KYC file — the procedure is identical to CRS. If the client is not an individual but a company or a fund, both the entity and its controlling persons go into the report: the look-through optics of CRS carry over into CARF unchanged. ## What goes into the exchange — and what does not The report is aggregate, not transaction-level. For each calendar year, for each type of crypto-asset and each category of transaction, the provider passes on three numbers: the gross amount, the number of units, and the number of transactions. There are four categories: crypto-to-fiat exchanges (acquisitions and disposals reported separately), crypto-to-crypto exchanges (both legs at fair market value at the time of the transaction), transfers (inbound, outbound, and, on a separate line, outbound to a self-hosted wallet), and reportable retail payment transactions — payments for goods and services processed through the provider above USD 50,000. Plus client identification: name, address, every jurisdiction of tax residence, TIN, date and place of birth. What is absent from the report is far more interesting. CARF does not transmit wallet balances. This is not a detail but a structural departure from CRS, where the year-end account balance is the core of the report. CARF looks at movement rather than position, and that architecture has a side benefit for administrations: it cannot be defeated by clearing an account down to zero on 31 December. Wallet addresses do not make it into the exchange file either — the provider is required to retain them internally (five years under the UK implementation), but they do not travel outward. | Stage | First wave (52 jurisdictions) | Second wave (around 15 jurisdictions) | | --- | --- | --- | | Due diligence and data collection | from 1 January 2026 | from 1 January 2027 | | First reporting year | 2026 | 2027 | | First automatic exchange | 2027 | 2028 | | Who is inside | The EU in full, the United Kingdom, Cayman, Jersey, Guernsey, the Isle of Man, Gibraltar, Liechtenstein, Japan, Korea, Brazil, South Africa, Mexico, New Zealand, Kazakhstan | Hong Kong, Singapore, the UAE, the BVI, the Bahamas, Turkey, Malaysia, Thailand, Barbados, the Seychelles | Hence the asymmetry: the tax authority will see how much you sold and bought over the year, but not how much is left. It reconstructs the position from a chain of annual reports and your own returns — which is why the working signal becomes the mismatch between the aggregate and the declaration, not the size of the turnover itself. ## The calendar: two waves and moving dates The first wave collects data from 1 January 2026 and exchanges in 2027 for the 2026 year — that is 52 jurisdictions. The second wave, around fifteen jurisdictions, starts a year later: collection from 2027, exchange in 2028. Hong Kong has confirmed this in legislation — the CARF rules apply from 1 January 2027, with the first exchange in 2028; the UAE has stated exchange by 2028 on 2027 data; Singapore is steering the industry towards reporting from 2028. By mid-2026, more than seventy jurisdictions had committed to implementing CARF. A wave, however, is not a guarantee. Switzerland supplied the live example: the legislative framework entered into force on 1 January 2026, but on 26 November 2025 the Federal Council decided that the crypto provisions would not apply in 2026, because of unresolved confidentiality questions with partner jurisdictions. Hence the working rule: check not "the wave" in the abstract, but the specific jurisdiction of each of your venues on a specific date. ## The EU and the US: two different machines In the EU, CARF is implemented by Directive 2023/2226 (DAC8): transposition by 31 December 2025, application from 1 January 2026, and the first exchange between member states within nine months of the reporting year, that is by 30 September 2027. The link with MiCA is direct: an authorised CASP automatically falls inside the DAC8 perimeter in its country of authorisation, while a non-EU provider serving European clients must register and report in one of the member states. The alignment of calendars is no coincidence — the [MiCA](https://wiki.private.law/en/mica-eu) transitional period closes on 1 July 2026, and the market serving Europeans narrows to licensed players, meaning to those already wired into the reporting machine. The US runs on its own track. Brokers file Form 1099-DA: gross proceeds for transactions from 1 January 2025, and cost basis for certain transactions from 1 January 2026. But this is domestic reporting to the IRS, not international exchange: the US has not signed the CARF multilateral agreement, and its accession to exchanges is announced for 2029. The asymmetry is exactly the one seen with FATCA against CRS: information flows inward, not outward. For a non-US person, an American venue temporarily remains the least transparent node as far as their home tax authority is concerned; for a US citizen or resident the picture is mirrored — the IRS sees everything, and sooner than anyone else. ## CRS 2.0 alongside: what travels outside CARF The amended CRS operates from 1 January 2026 in parallel and picks up what CARF does not cover: specified electronic money products, central bank digital currencies and — most importantly for private capital — indirect ownership of crypto. A future, forward or option on a relevant crypto-asset, as well as an interest in an investment vehicle holding crypto as a financial asset, is reported under CRS rather than CARF. And it is reported together with the balance, because it is an ordinary financial account with all the standard apparatus attached. Overlap between the two regimes is real: one group can be a Reporting FI and an RCASP at the same time. To avoid duplication, the amended CRS contains a coordination rule — gross proceeds on an asset that is simultaneously a Relevant Crypto-Asset and a Financial Asset may be left out of CRS reporting if they already go out under CARF. The rule is optional and has been implemented unevenly across jurisdictions, so double reporting in particular corridors remains a practical possibility rather than a theoretical one. ## What to do before the first exchange First, take inventory of the perimeter. List every venue, custodian, payment service and wallet provider where you have transacted since 2026, and answer two questions for each: is it an RCASP, and in which jurisdiction. On a separate line, record what you stated in your self-certification at onboarding. The residence you declared to an exchange three years ago is the address your file will travel to; if it is out of date, what you get is not silence but a mismatch in somebody else's country. Second, reconcile against prior-year returns. The exchange is not retrospective — nothing will be transmitted automatically for 2021 to 2025. But the 2026 picture will be read against that history: a large disposal with no previously declared acquisition is a ready-made question. The same applies to the classic crypto-to-crypto storyline, which many people do not treat as a taxable event, yet which enters the report at fair market value on both legs. Third, keep basis records. CARF hands the tax authority gross amounts and no cost basis; proving basis will be on you, from your own records — there is a separate analysis of wallet-by-wallet method and jurisdictional specifics in [crypto taxes by country](https://wiki.private.law/en/crypto-tax-by-country). Export your transaction history now: some venues are leaving the European market under MiCA, and the archive leaves with them. In parallel, it is worth assembling a [source of funds](https://wiki.private.law/en/source-of-funds) pack: a large fiat deposit onto an exchange is precisely the situation where the tax question and the banking compliance question are asked at the same moment. Fourth, be clear-eyed about self-custody. Formally, transfers between your own wallets and P2P deals sit outside the CARF perimeter. But an outbound transfer to a self-hosted wallet is broken out as its own category in the report: the provider will disclose the amount and the number of units that left the venue, even without revealing the recipient address. And the road back into fiat almost always runs through an RCASP. The entry point and the exit point are visible; only the interval is not — as a privacy model this works poorly, but as an operational security model it still makes sense. Fifth, act now if a discrepancy already exists. [Voluntary disclosure](https://wiki.private.law/en/voluntary-disclosure) mechanisms are built so that they retain value only until the moment the data has reached the administration. The gap between today and the first exchange is exactly that window, and it closes on a schedule rather than on circumstances. > 🍓 CARF transmits not what you hold but what you did: annual aggregates of exchanges and transfers — without wallet balances and without addresses. The first wave of 52 jurisdictions exchanges in 2027 for 2026, the second — including Hong Kong, Singapore and the UAE — in 2028 for 2027, while the US stays outside the exchange with its own 1099-DA until the announced date of 2029. The practical work comes down to three things: know which of your venues are RCASPs and what residence you declared there; keep your own basis records, which the report does not contain; and close prior-year discrepancies before the file arrives. *This material is for general information and analysis only and does not constitute individual tax or legal advice; implementation dates and the composition of the waves are being refined by jurisdictions and require verification as at the date of reliance.* --- ## Sources - [OECD — Crypto-Asset Reporting Framework and amendments to the CRS](https://www.oecd.org/en/topics/sub-issues/crypto-asset-reporting-framework-and-amendments-to-the-common-reporting-standard.html) - [HMRC — International Exchange of Information Manual, IEIM8000110 (CARF)](https://www.gov.uk/hmrc-internal-manuals/international-exchange-of-information/ieim8000110) - [Council Directive (EU) 2023/2226 (DAC8)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32023L2226) - [European Commission — DAC8](https://taxation-customs.ec.europa.eu/taxation/tax-transparency-cooperation/administrative-co-operation-and-mutual-assistance/directive-administrative-cooperation-dac/dac8_en) - [UAE Ministry of Finance — CARF Guidance](https://mof.gov.ae/wp-content/uploads/2025/09/The-Crypto-Asset-Reporting-Framework-Guidance-document-EN.pdf) - [IRD Hong Kong — Crypto-Asset Reporting Framework](https://www.ird.gov.hk/eng/tax/dta_carf.htm) - [IRAS Singapore — CARF Overview and Latest Developments](https://www.iras.gov.sg/taxes/international-tax/crypto-asset-reporting-framework-(carf)/carf-overview-and-latest-developments) - [Cayman DITC — Amended CRS Quick Guide](https://www.ditc.ky/wp-content/uploads/Amended_CRS_Quick_Guide.pdf) - [IRS — Final regulations for broker reporting on digital assets](https://www.irs.gov/newsroom/final-regulations-and-related-irs-guidance-for-reporting-by-brokers-on-sales-and-exchanges-of-digital-assets) --- ## Factual claims - By 2027 tax administrations will have something they have never had before: an annual picture of an individual's crypto-asset activity, arriving not on request and not through a leak, but down a routine automatic-exchange channel. - The first wave collects data from 1 January 2026 and exchanges in 2027 for the 2026 year — that is 52 jurisdictions. - The amended CRS operates from 1 January 2026 in parallel and picks up what CARF does not cover: specified electronic money products, central bank digital currencies and — most importantly for private capital — indirect ownership of crypto.