Compliance
Tax Adviser Liability: What UK Businesses Need to Know for Advisers Facilitating Non-Compliance
From April 2026, UK law strengthens HMRC’s powers to penalise tax advisers who facilitate non-compliance. Businesses and individuals need to understand what’s changing to avoid risk.
By NomadicTax Research Team • 5-8 min read • March 18, 2026
## Introduction
From **1 April 2026**, significant new **legal powers and sanctions** will come into force in the UK to tackle advisers who **deliberately facilitate tax non-compliance**. These changes are part of the 2025 Budget and Finance Bill 2025-26. ([gov.uk](https://www.gov.uk/government/publications/enhancing-hmrcs-powers-tackling-tax-adviser-facilitated-non-compliance?utm_source=openai))
This article explains:
- who is affected
- what obligations and risks are introduced
- how taxpayers and advisers should prepare
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## Who is affected
- **Tax advisers**—including individuals, firms, or corporate entities—who assist clients in UK tax matters and may facilitate under-reporting or avoidance. ([gov.uk](https://www.gov.uk/government/publications/enhancing-hmrcs-powers-tackling-tax-adviser-facilitated-non-compliance/enhancing-hmrcs-powers-to-tackle-tax-advisers-who-facilitate-non-compliance?utm_source=openai))
- **Clients** of these advisers who may be exposed if their adviser is found to have facilitated deliberate non-compliance. ([gov.uk](https://www.gov.uk/government/consultations/enhancing-hmrcs-ability-to-tackle-tax-advisers-facilitating-non-compliance/outcome/enhancing-hmrcs-ability-to-tackle-tax-advisers-facilitating-non-compliance-summary-of-responses?utm_source=openai))
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## What changes take effect on 1 April 2026
| Change | Key Details |
|---|---|
| **Power to issue file access notices** without tribunal-approval | HMRC can issue a file access notice if it has a **reasonable suspicion** of adviser-facilitated non-compliance; tribunal approval replaced by senior officer sign-off. ([gov.uk](https://www.gov.uk/government/publications/enhancing-hmrcs-powers-tackling-tax-adviser-facilitated-non-compliance/enhancing-hmrcs-powers-to-tackle-tax-advisers-who-facilitate-non-compliance?utm_source=openai)) |
| **Stronger penalty framework** | Penalties for failure to comply (or providing inaccurate info), enhanced penalties for deliberate non-compliance, including penalties based on **tax loss**. Repeated offences face higher penalties. ([gov.uk](https://www.gov.uk/government/publications/enhancing-hmrcs-powers-tackling-tax-adviser-facilitated-non-compliance/enhancing-hmrcs-powers-to-tackle-tax-advisers-who-facilitate-non-compliance?utm_source=openai)) |
| **Publication of sanctioned advisers** | HMRC gains new power to publish details about advisers found facilitating non-compliance. ([gov.uk](https://www.gov.uk/government/publications/enhancing-hmrcs-powers-tackling-tax-adviser-facilitated-non-compliance/enhancing-hmrcs-powers-to-tackle-tax-advisers-who-facilitate-non-compliance?utm_source=openai)) |
| **Mandatory registration** | From **April 2026**, all tax practitioners interacting with HMRC on behalf of clients must **register** and meet minimum standards. ([gov.uk](https://www.gov.uk/government/publications/budget-2025-overview-of-tax-legislation-and-rates-ootlar/budget-2025-overview-of-tax-legislation-and-rates-ootlar?utm_source=openai)) |
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## Risks and obligations for clients
- If your adviser is sanctioned, clients may face delays, loss of trust, or reputational harm.
- You must ensure your adviser is **registered and compliant** under the new rules.
- When delegating work (e.g. claims, returns), insist on written authorisation and clarity on standards the adviser upholds.
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## Practical examples
- A business uses an overseas adviser who claims a large deduction. HMRC reasonably suspects deliberate misstatement. They issue a file access notice under the new powers. If adviser cannot justify, both adviser and possibly client face penalties.
- A sole trader hires a tax agent who submits incorrect returns repeatedly. Under the new regime, agent gets higher penalties; their name could be published. The trader should consider engaging a practitioner bound by professional body standards.
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## Actionable steps
1. **Check your adviser’s registration status** with HMRC, ensuring they are compliant.
2. **Review agreements** to include standards of conduct, liability clauses, and authorisation mechanisms.
3. **Maintain clear records** of advice received—emails, drafts—so you can defend if any issue arises.
4. **Stay updated** on HMRC guidance, especially relating to the Standard for Agents and the new penalty structure.
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## Conclusion
These changes reflect UK government’s drive to shore up the integrity of the tax system. For taxpayers, the best protection is **choosing a reputable adviser**, ensuring proper registration, and documenting everything. Once these new rules take effect, the cost of mis-advice will be higher than ever – legally, financially, and reputationally.