What does the Crypto Tax CARF Calculator do?

Track crypto disposals, calculate CGT and understand CARF automatic reporting from 2026. All calculations are performed in your browser using official UK rates and thresholds.

Is this calculator updated for the 2025/26 tax year?

Yes. This calculator uses the latest HMRC rates and thresholds for the 2025/26 UK tax year, which runs from 6 April 2025 to 5 April 2026. Rates are verified against official HMRC publications.

Do I need to tell HMRC about this?

Whether you need to report to HMRC depends on your individual circumstances. If you are unsure, check GOV.UK or contact HMRC directly. This calculator provides estimates for guidance only.

Crypto Tax CARF Calculator Trending

Track crypto disposals, calculate CGT and understand CARF automatic reporting from 2026.

Last updated: April 2026 · Source: GOV.UK — Crypto Asset Reporting Framework consultation

Disposals

Buy

Sell

Qty

£7,500.00

Buy

Sell

Qty

£2,100.00

Total Gains

£9,600.00

Total Losses

£0.00

Net Gain

£9,600.00

Taxable (after £3,000)

£6,600.00

CGT (basic 10%)

£660.00

CGT (higher 20%)

£1,320.00

CARF Reporting (from 2026):

UK exchanges will automatically report your crypto transactions to HMRC under the Crypto Asset Reporting Framework. Ensure all disposals are declared.

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

The Crypto Asset Reporting Framework (CARF) is a new international reporting standard developed by the OECD and adopted by the UK. From 2026, UK crypto asset service providers must collect and report information about their users' transactions to HMRC, who will exchange this data with other tax authorities.

Under CARF, reportable transactions include exchanges of crypto for fiat currency, crypto-to-crypto swaps and transfers of crypto assets. The framework requires reporting the total gross proceeds, number of transactions and the type of crypto asset for each user. This is separate from your personal obligation to declare gains on your tax return.

This calculator estimates your reporting exposure under CARF based on your transaction history. It summarises which of your trades are reportable, the total gross value that will be reported to HMRC and whether your activity triggers additional due-diligence requirements.

Example: Annual crypto trading activity

Crypto-to-fiat sales: 12 transactions, gross proceeds £24,000
Crypto-to-crypto swaps: 30 transactions, gross value £45,000
Total reportable gross: £69,000
Transactions reported to HMRC under CARF: 42
CGT liability (separate calculation): based on gains after cost basis

Source: GOV.UK — Crypto Asset Reporting Framework consultation

Frequently Asked Questions

What does the Crypto Tax CARF Calculator do?: Track crypto disposals, calculate CGT and understand CARF automatic reporting from 2026. All calculations are performed in your browser using official UK rates and thresholds.
Is this calculator updated for the 2025/26 tax year?: Yes. This calculator uses the latest HMRC rates and thresholds for the 2025/26 UK tax year, which runs from 6 April 2025 to 5 April 2026. Rates are verified against official HMRC publications.
Do I need to tell HMRC about this?: Whether you need to report to HMRC depends on your individual circumstances. If you are unsure, check GOV.UK or contact HMRC directly. This calculator provides estimates for guidance only.