Compliance
Compliance Essentials: Making Tax Digital and Advisory Registration in the UK
Mandatory adviser registration and digital reporting reforms coming in 2026 will change how both taxpayers and agents handle compliance.
By NomadicTax Research Team • 5-8 min read • March 9, 2026
## Key UK Compliance Reforms Taking Effect in 2026–2027
The UK’s **Budget 2025**, as laid out in the Finance Bill 2025-26 and related legislation, introduces several reforms:
- **Mandatory registration for tax advisers** interacting with HMRC, starting from **April 2026**. All advisers will have to meet minimum standards when submitting on behalf of clients. ([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))
- **Increased penalties for late Corporation Tax filings**: From April 1, 2026, penalties for late returns scale sharply, especially in cases of repeated failures. ([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))
- **Changes to Self Assessment thresholds**: Trading, property, or ‘other taxable’ income below **£3,000 gross** may escape full Self Assessment requirements; the threshold increases to reduce returns required. By law, the income must be reported and options include a new simplified digital service. ([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))
## What Tax Agents Must Do Now
- **Register with HMRC**: If you already act on behalf of clients, prepare documentation now for adviser registration and ensure you meet all minimum knowledge, skill, and conduct standards. Failure to register could mean loss of ability to represent clients.
- **Update internal systems**: With raised penalties and increased compliance requirements, ensure filing systems flag late returns or related obligations early.
- **Advise clients on income reporting**: Clients with low revenue from side-lines or property should be informed of whether they need full Self Assessment—or whether the simplified threshold applies. They may opt into or out of self-assessment depending on which route is least burdensome.
## Examples in Practice
- *Agent A*: A tax adviser working with small businesses begins March 2026, learns of mandatory registration, submits application, takes relevant training so as to avoid issues post-April.
- *Client B*: Someone who sells on a marketplace and earns £2,500 from trading goes under the £3,000 threshold and might avoid needing a Self Assessment if they choose the new digital reporting service.
## Risk Areas and Guardrails
- **Non-compliance penalties**: With higher penalties, repeated late filings will cost more from April 2026.
- **Unsuitable advice**: Advisers need to stay current with HMRC standards—misadvice could expose clients and agent to sanctions.
- **Timing mismatches**: Changes here do not happen overnight. Guidance is still being clarified and systems built. Keep up with HMRC guidance publications. ([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))
**Key takeaway:** These upcoming compliance reforms in the UK are not optional. Both individuals and agents should audit their status, update processes, and ensure that from April 2026 and beyond they are meeting HMRC requirements.