Tax Planning
How the New UK ‘Foreign PE Exemption’ Will Reshape Corporation Tax Obligations
Understanding the shift to mandatory foreign permanent establishment exemption for UK companies—who it impacts, when it starts, and how to plan ahead to avoid surprise tax bills.
By NomadicTax Research Team • 5-8 min read • June 13, 2026
## What’s Changing
From **21 May 2026**, the UK government published a policy paper making it **mandatory** for UK-resident companies to **exclude profits and losses** attributable to *foreign Permanent Establishments (PEs)* from their UK Corporation Tax computations. This ends the previous option to elect for exemption—it will now be required.([gov.uk](https://www.gov.uk/government/publications/foreign-permanent-establishment-exemption/foreign-permanent-establishment-exemption-policy-paper?utm_source=openai)) For most firms, the change applies from **accounting periods beginning on or after 1 January 2027**, but companies in **oil & gas exploration or extraction** with foreign PEs are hit earlier from **1 September 2026**.([gov.uk](https://www.gov.uk/government/publications/foreign-permanent-establishment-exemption/foreign-permanent-establishment-exemption-policy-paper?utm_source=openai))
## Why the Government is Making the Shift
These reforms address concerns that foreign losses are being used to unduly shelter UK profits without equivalent returns on foreign profits.([gov.uk](https://www.gov.uk/government/publications/foreign-permanent-establishment-exemption/foreign-permanent-establishment-exemption-policy-paper?utm_source=openai)) The rules aim to preserve a competitive exemption environment while ensuring the Exchequer doesn’t lose out through loopholes in loss relief or tax credit arrangements. An anti-avoidance rule is also planned to stop artificial shifting of loss or profit attributes.([gov.uk](https://www.gov.uk/government/publications/foreign-permanent-establishment-exemption/foreign-permanent-establishment-exemption-policy-paper?utm_source=openai))
## Key Dates & Transitional Rules
| Entity Type | Effective Date | Main Transition Steps |
|-------------|----------------|------------------------|
| Oil & Gas PEs | From **1 September 2026** | Accounting periods ending 31 August 2026 are deemed to end that day; new regime applies from 1 September.([gov.uk](https://www.gov.uk/government/publications/foreign-permanent-establishment-exemption/foreign-permanent-establishment-exemption-policy-paper?utm_source=openai)) |
| Other Companies with Foreign PEs | For accounting periods starting on or after **1 January 2027** | Profits & losses from such PEs no longer offset UK profits; transitional reliefs limited.([gov.uk](https://www.gov.uk/government/publications/foreign-permanent-establishment-exemption/foreign-permanent-establishment-exemption-policy-paper?utm_source=openai)) |
## Practical Impacts & Example
- Companies with foreign PEs will **no longer be able to use losses** from those foreign operations to reduce UK taxable profits after the effective date.
- Tax groups must consider **profit attribution** and ensure foreign PEs are separately identified in accounting.
- Example: A UK firm with a foreign PE that had losses of £2 million used to reduce UK taxable profits will **lose that relief** once the rules apply. After the effective date, those losses are ignored for UK Corporation Tax, even if the foreign PE continues to make losses.
## Planning Tips for Businesses
- **Audit accounting periods now**: Businesses in sectors like oil & gas should check their year ends to see if they fall under the earlier deadline.
- **Evaluate group structures**: Can profit/loss flows be reorganized to minimize negative impact? Consider foreign subsidiaries vs PEs.
- **Adjust forecasting and cash flow**: Losing the ability to offset losses can increase UK Corporation Tax liabilities.
- **Review investment in foreign PEs**: If you're investing overseas expecting UK loss relief, that model needs revising.
## Summary
The *Foreign Permanent Establishment Exemption* changes mark a major shift: loss relief via foreign PEs will no longer be an “opt-in” feature but a mandatory one, with earlier impact in resource-intensive sectors. Businesses must act now to assess exposure, adjust accounting strategies, and forecast tax burdens accurately.