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Why we need to collect your Tax Identification details (National Insurance Number)

  • Updated

Why we’re asking for this

From 1 January 2026, new international tax reporting rules known as the Crypto-Asset Reporting Framework (CARF) and the EU’s DAC8 rules require crypto-asset service providers like us to collect certain tax information from customers and report relevant information to tax authorities in certain cases. HMRC has also confirmed that CARF is now part of the automatic exchange of information framework. Without providing us with this data you may be unable to use our services.

As part of these obligations, we may need to collect and verify:

  • your country (or countries) of tax residence
  • your Tax Identification Number (TIN) for each relevant country
  • if you are tax resident in the UK, your National Insurance Number (where applicable)
  • certain related identity details, such as your name, address and date of birth

Under the OECD CARF rules, a valid self-certification for an individual generally includes name, address, tax residence, TIN for each reportable jurisdiction, and date of birth.

 

What does this mean for UK customers?

If you are tax resident in the UK, we may ask you to provide your National Insurance Number.

In practice:

  • If you are a UK tax resident individual, your National Insurance Number will usually be the tax identifier we ask for.
  • If you are not tax resident in the UK, we will usually ask for the TIN issued by your country of tax residence instead:
    • Ireland – PPS Number or other tax identifier, depending on tax status
    • Germany – Steueridentifikationsnummer
    • France – Numéro fiscal
    • Australia – Tax File Number (where appropriate)
    • United States – SSN or ITIN

If your country does not issue TINs, or if you are not legally required to have one, the CARF framework allows for exceptions in some circumstances, but you will need to provide us with rationale for this and we may ask to verify specific details.

 

Why do you need this now?

These rules are designed to improve tax transparency for crypto-assets globally.

Under DAC8 / CARF, crypto-asset service providers may need to report information about customers and certain transactions to their local tax authority (for us, this is HMRC), which can then be shared with other tax authorities where required under international exchange agreements.

 

What happens if I don’t provide it?

If we ask you for your tax identification details and you do not provide them, we may be required to:

  • place restrictions on your account
  • limit certain deposits, withdrawals, or trading features
  • pause access to some services until your tax details are confirmed
  • in some cases, treat your account as non-compliant for regulatory reporting purposes

We’ll always try to give you notice and explain what action is needed before any restrictions apply.

 

How we use your information

We only collect this information to meet our legal and regulatory obligations, including:

  • tax due diligence
  • regulatory reporting under DAC8 / CARF
  • identity verification and record keeping
  • responding to lawful requests from tax or regulatory authorities

Your information will be handled in line with our Privacy Policy and applicable data protection laws.

 

How to update your tax details

When prompted, on login to your CoinJar account, you’ll be able to:

  1. confirm your country of tax residence
  2. provide your National Insurance Number (if you are tax resident in the UK), or
  3. provide your TIN for any other country where you are tax resident
  4. review and confirm that the information is accurate

Please make sure the details you provide match your official tax records.

 

Frequently Asked Questions

Is this the same as KYC?

Not exactly. We already collect identity information for AML/KYC purposes. These new rules are tax reporting rules, so we may need additional tax-specific information such as your tax residence and TIN / National Insurance Number.

Why are you asking for my National Insurance Number?

If you are tax resident in the UK, we may need a UK tax identifier to comply with DAC8 / CARF reporting requirements. In many cases, this will be your National Insurance Number.

What if I have more than one country of tax residence?

You may need to provide a TIN for each country where you are tax resident.

What if my country doesn’t issue a TIN?

In some cases, the rules allow an exception where a jurisdiction does not issue TINs or the customer is not required to have one. If that applies to you, we’ll guide you through the appropriate declaration, which would include you providing rationale for this and may require you to verify specific information requirements

Is my information shared automatically?

We only report where required by law. If your account is reportable under DAC8 / CARF, information may be reported to the relevant tax authority and shared with other participating jurisdictions as required under law.

 

Need help?

If you’re unsure what your tax residence is, or what TIN you should provide, we recommend speaking with an independent tax adviser.

If you have questions about why we’re requesting this information, please submit a new Support request. We'd be happy to help.



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