The short version
- CARF is the OECD’s Crypto-Asset Reporting Framework: crypto platforms report user and transaction data to their tax authority yearly, and authorities exchange it automatically between countries.
- Roughly 52 jurisdictions plan first exchanges in 2027; a further group of about 15 — including the United States, Singapore, Hong Kong and the UAE — from 2028. Around 75 have committed in total.
- The EU embedded CARF in law as DAC8, applying from 1 January 2026; the UK’s regime also went live on 1 January 2026, with first reports to HMRC due by 31 May 2027.
- For individuals: the data side of the ledger is no longer yours alone — file accurately and keep your records reconciled with your platforms’, because explaining a mismatch costs more than preventing one.
What CARF actually is
For over a decade, bank account data has flowed automatically between tax authorities under the OECD’s Common Reporting Standard (CRS) — and crypto sat outside that net. The Crypto-Asset Reporting Framework closes the gap: “reporting crypto-asset service providers” (exchanges, brokers, some wallet and payment services) must identify their users, aggregate their transactions, and report annually to their local tax authority — which then exchanges the data with other authorities, CRS-style.[1]
What gets reported
Exact fields follow each jurisdiction’s implementing law; at framework level the categories are:
| Category | Broad content |
|---|---|
| Account holder identity | Name, address, residence, tax identification number (TIN), date of birth |
| Asset types | The relevant crypto-assets involved |
| Transaction aggregates | Counts and values of purchases, sales and crypto-to-crypto exchanges |
| Transfers | Reportable transfers, including to external wallet addresses |
The timeline
- 2022–2023: the OECD publishes CARF and the matching CRS amendments; a first wave of jurisdictions jointly commits to legislate.
- October 2023: the EU adopts DAC8 (Directive (EU) 2023/2226), writing CARF into EU law.[2]
- 2026: domestic frameworks go live and platforms begin due diligence and data collection on 2026 activity — DAC8 applies from 1 January, and the UK’s regulations took effect the same day.
- From 2027: some 52 jurisdictions begin automatic exchange — the UK, Germany, France, Canada, Japan, Korea, Australia and New Zealand among them.[1]
- From 2028: a further group of about 15 joins, including the United States, Singapore, Hong Kong and the UAE.
Still a moving process
Participant lists, effective dates and field details shift as legislation lands — the OECD’s 2025 monitoring update already counts around 75 committed jurisdictions. This page gives the shape; the official announcements of your jurisdiction, and your exchange’s, give the letter.
Where it already bites: the UK example
This stopped being theoretical on 1 January 2026. UK-based crypto service providers are now under a live duty to collect identifying information from their users — with per-user penalties for incomplete or unverified data — and must deliver their first reports, covering calendar-year 2026, to HMRC by 31 May 2027. If your exchange has recently asked you to confirm your tax residence or TIN, this is why. EU platforms are on the equivalent DAC8 clock.[3]
What it means for you
CARF changes nothing about what you owe. It changes how much your tax authority knows independently of you — and when the platform’s report and your return disagree, the query lands on you. The practical response is unglamorous:
- File the year’s taxable events accurately (the country pages cover what counts).
- Reconcile: keep your own transaction detail consistent with what your platforms hold — cost basis and holding periods especially.
- Archive: export and keep transaction histories and annual statements. How much and how long, in Keeping transaction records.
Official sources
- [1] OECD, Crypto-Asset Reporting Framework (CARF) — oecd.org (search Crypto-Asset Reporting Framework)
- [2] EU, Directive (EU) 2023/2226 (DAC8) — eur-lex.europa.eu (CELEX:32023L2226)
- [3] HMRC, Cryptoassets Manual: the Cryptoasset Reporting Framework (CRYPTO49000) — gov.uk/…/crypto49000
- Committed jurisdictions and dates: OECD Global Forum, Jurisdictions committed to implement the CARF — oecd.org/tax/transparency
Checked against the official pages on 1 September 2026. CARF and DAC8 are still rolling out; participant lists and effective details per official announcements.
Before you rely on this
General information — not tax, legal or investment advice for your situation, and not the voice of the OECD, the EU or HMRC.