Key Takeaways
- The Revenue Service administers tax in Guernsey under a defined legal mandate that determines its scope over non-resident owners.
- Non-resident owners must register with the Revenue Service and can file and pay through its online portal within the annual calendar.
- Assessments may be reviewed, audited or investigated, and the authority holds enforcement powers backed by penalty, appeal and dispute resolution channels.
- Understanding office contacts and communication routes helps foreign owners and advisers respond promptly to filings and queries.
Meet the Revenue Service: Guernsey's Tax Administration Body
The tax authority in Guernsey is the States of Guernsey Revenue Service, headed by the Director of the Revenue Service, who administers income tax and social security contributions across the Bailiwick. Foreign owners with income arising locally, whether from property, a business, or a fund interest, deal with this body for registration, filing, assessment, and payment. You can find the department's functions set out on the Revenue Service homepage.
This article explains how the authority operates, what it expects from a non-resident entity or individual, and where appeal and enforcement powers sit. It will be most useful to foreign business owners, investors with Guernsey-source income, and the advisers structuring their affairs.
The Legal Mandate and Scope of the Revenue Service
The Revenue Service draws its powers from the Income Tax (Guernsey) Law, 1975, amended many times since enactment. Its remit covers income tax and social security contributions for Guernsey, Alderney, and Herm, alongside the international exchange of tax information and debt recovery for other States departments.
Several taxes common elsewhere simply do not exist here. The island levies no capital gains tax, no inheritance tax, and no value added tax, though a Goods and Services Tax has been approved to launch from 2027.
Tax rates are not set by the Revenue Service. They are fixed by the States of Deliberation, the legislature, leaving the authority to administer and collect rather than to legislate rates.
The island's international footprint is wide for its size. Guernsey has signed 17 full double taxation agreements and more than 61 tax information exchange agreements, and is a party to the OECD's Multilateral Convention on Mutual Administrative Assistance in Tax Matters.
| Measure | Status |
|---|---|
| Country-by-country reporting | Accounting periods from 1 January 2016 |
| Economic substance rules | Accounting periods from 1 January 2019 |
| OECD Pillar Two rules | Accounting periods from 1 January 2025 |
| Pillar Two threshold | MNE groups with revenues of EUR 750 million or more |
The Income Tax (Guernsey) (Amendment) Ordinance, 2021 extended the authority's reach further, empowering it to regulate FATCA/CRS compliance and to collect UK tax debts on behalf of HMRC where required.
Company Incorporation in Guernsey
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Registering with the Revenue Service as a Non-Resident Owner
Non-residents who earn income arising in Guernsey may be liable to income tax, and registration is not optional. By law, a non-resident must appoint a locally based agent who pays the tax and completes the yearly return on their behalf.
The term "agent" is read broadly. It includes a manager and any person receiving or paying income on behalf of, or to, a non-resident individual.
Four duties attach to a non-resident: register with the Revenue Service, maintain a locally based agent, report any change in circumstances, and submit returns and pay tax through that agent. Handling your own affairs directly is possible only by prior written concession, never as the default.
A foreign-incorporated company with Guernsey-source income registers using the Company Registration Form; a foreign partnership uses the Partnership Registration Form. Registration produces a Tax Reference Number, and for individuals a social security number.
Tax may be deducted from sums owed to a non-resident, such as rent, and must reach the Revenue Service within one month of deduction, accompanied by a non-resident deduction form.
Other forms cover specific situations, including the Company Requesting Non-Resident Status Form, the Request for Company Migration Form, and the Form of Authority (1012a) for professional advisers. Financial institutions register and report separately through the IGOR system and must file an annual validation.
Online Services and the Revenue Service Filing Portal
Most filing runs through my.gov.gg, the MyGov platform, where individuals and companies complete and submit returns. The portal offers distinct login routes for individual, organisation, accountant, and corporate service provider users.
Filing online is compulsory for all Guernsey companies; there is no paper alternative. To submit a corporate return for a Guernsey-based entity, you first register a MyGov organisation account, after which returns are usually pre-populated with existing details and processed automatically.
Two specialist systems sit alongside the main portal. Financial institutions reporting under FATCA and CRS use IGOR, in operation since 2015, and a legacy individual portal remains at eforms.gov.gg for people working on the island. In-scope multinational groups obtain Pillar Two registration and agent authorisation forms separately from the authority. Portal queries can be sent to the Revenue Service at its dedicated portal query address.
Ongoing Compliance in Guernsey
Keep your Guernsey entity compliant with filings, returns, and statutory obligations.
The Annual Filing and Payment Calendar
The income tax year matches the calendar year, running 1 January to 31 December. Joint filing for married couples ended on 1 January 2023, so each individual now submits a separate return.
| Return | Year | Deadline |
|---|---|---|
| Personal | 2024 | 31 January 2026 |
| Personal | 2025 onwards | 30 November |
| Corporate | Year of charge 2024 | 31 January 2026 |
| Corporate | Year of charge 2025 onwards | 30 November |
The 2025 personal and corporate returns are available online, both due 30 November 2026. An automatic penalty applies where a return misses its deadline.
Payment follows its own pattern. Interim assessments are payable in four instalments, due by the 15th day after each quarter end (15 April, 15 July, 15 October, and 15 January), while a final individual assessment falls due within 30 days of being raised.
Multinational groups within Pillar Two face longer windows. Returns are due within 15 months after the fiscal year-end, extended to 18 months for the first year, and registration for a Domestic Filing Entity must occur within the later of 12 months from the start of the first in-scope period or 6 months from joining the group.
How Assessments Are Issued and Reviewed
Each company return is assessed as it arrives. Turnaround from submission to a final assessment, which sets out the balancing income tax due, is generally around three months depending on workload.
Where liabilities are not yet settled, the authority may raise an estimated assessment based on prior-year figures, replacing it with a final assessment once numbers are agreed. The Director can also assess income not previously assessed at any point up to six years after the end of the year of charge in which it arose.
A recovery plan addresses a publicly acknowledged backlog of assessments from earlier years, prioritising repayments, older cases, and outstanding assessments, with 2025 returns processed in order of receipt. If you disagree with an interim figure, a Request for Revision of Interim Assessment form is available from the forms page.
Guernsey Incorporation Pricing
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Audit, Investigation and Enforcement Powers
The authority holds substantial inspection powers under the 2021 Ordinance. It may enter business premises to examine premises and documents with seven days' notice or with consent, and without either where it first obtains a Judge's approval.
Cooperation is a legal obligation. Any employee who obstructs or fails to give reasonable assistance during a site visit can commit a criminal offence, although certain documents may and should be withheld, including legally privileged material and papers relating to tax appeals.
Where a financial institution is suspected of breaching international tax rules, the Revenue Service can appoint, or require the institution to appoint, an inspector to investigate compliance and oversee remedial steps. The institution bears the inspector's costs unless those costs are unreasonable, and refusing to assist the inspector is itself a criminal offence.
- Economic substance compliance is policed by the Director, who can require delivery of relevant documents and enter premises subject to occupier consent, at least one week's notice, and approval of the Bailiff of Guernsey.
Debt collection is handled by the Revenue Service's Debt Management section, which can instigate court proceedings where necessary.
Penalties, Appeals and Dispute Resolution Channels
Late or missing returns draw an automatic penalty. For an individual whose income is below the personal allowance, the late filing penalty cannot exceed £50, while Pillar Two late filings carry a penalty of up to £1,000 by the 30th day of default.
Economic substance failures are treated more severely: a fine of up to £10,000 for an initial failure, rising to £100,000 for further failures, together with exchange of information with the relevant competent authorities.
Appeals run on a tight timetable. An appeal against a final assessment, surcharge, or supplement must be lodged within 30 days of the date of issue, under section 76 of the 1975 Law.
Since 1 January 2022, unresolved appeals are heard by the Guernsey Revenue Service Tribunal, which replaced the former Guernsey Tax Tribunal. Details of its remit appear on the Tribunal page.
The Tribunal is independent of the States of Guernsey, comprising nine members appointed by the Royal Court, including a President and Vice-President. It can confirm, annul, or vary the authority's determination, and either party may then ask for a case stated before the Ordinary Court on a point of law.
For economic substance disputes, a further appeal lies to the Royal Court of Guernsey within 21 days of the Tribunal's decision, again on a point of law. Tribunal decisions are not generally published, since they contain confidential taxpayer financial information.
Contacting the Revenue Service: Offices and Communication
The department operates as the States of Guernsey Revenue Service, reachable by post at PO Box 37, St Peter Port, Guernsey, GY1 3AZ. Telephone lines run 8.45am to 4pm, Monday to Friday, on 01481 225700, or +44 1481 225700 from overseas.
A customer counter at Edward T Wheadon House, Level 3, keeps the same weekday hours. Company migration forms go to the Revenue Service by email, and where you have consented to digital contact the department writes by encrypted email.
All correspondence should quote your social insurance number (GY number) and tax reference number so the authority can match it to your record.
Support is also offered in person and online. The Revenue Service runs quarterly general tax drop-in sessions and monthly online sessions for help with the online return, and the Clerk of the Tribunal can be reached on 01481 227000 ahead of any hearing.
What This Means for Foreign Owners and Advisers
A non-resident who receives any income arising in Guernsey, rental income included, may be liable to Guernsey income tax. The structural point to absorb is the agent rule: a non-resident individual must have an agent who deducts tax, files returns, and handles assessment and collection, with direct self-management permitted only by prior written concession.
The standard corporate tax rate is 0%, with 10% and 20% rates reserved for specific activities such as banking, regulated fiduciary business, domestic insurance, and property development. A foreign-incorporated company with local-source income must register using the Company Registration Form.
Substance and exchange obligations matter to anyone structuring across borders. Companies tax-resident on the island that undertake specified activities must show economic substance, meaning adequate people, premises, expenditure, and core income-generating activity conducted locally, for accounting periods after 1 January 2019.
Two further points shape adviser planning. The authority holds a six-year lookback window to assess income not previously assessed, which is relevant to retrospective compliance, and the Mandatory Disclosure Regime, once operational, will see information on avoidance arrangements, including beneficial owners, exchanged through the island's network of 17 DTAs and over 61 TIEAs.
A limited partner who is an individual not solely or principally resident in Guernsey, or a non-resident company, is not liable to Guernsey tax on income derived from a limited partnership's activities outside the island. Taxpayer data held by the authority is processed under the Data Protection (Bailiwick of Guernsey) Law, 2017.
Conclusion
Dealing with the tax authority in Guernsey turns on a few practical realities: registration is mandatory for non-residents with local income, a locally based agent is the default route for individuals, and all corporate returns are filed online with no paper option. The wider framework, from economic substance to Pillar Two and the island's exchange agreements, means foreign-owned entities should plan compliance from the outset rather than after an assessment arrives. With deadlines, a six-year lookback window, and an independent appeals tribunal in place, getting registration and filing right early is the soundest course for a non-resident owner.
How Expanship Can Help Your Business in Guernsey
Expanship supports foreign owners in meeting Revenue Service obligations, from initial registration and obtaining a Tax Reference Number to acting through the locally based agent arrangements that non-residents must use. The same team handles the broader needs of a foreign-owned entity on the island, coordinating formation, compliance, and reporting under one engagement.
- Company incorporation and entity setup
- Registered agent and registered office services
- Tax registration and annual filing with the Revenue Service
- Ongoing compliance and economic substance management
- Accounting and bookkeeping
- Introductions to local banking
To discuss your requirements, contact Expanship Guernsey.
Frequently Asked Questions
Yes. A foreign-incorporated company with Guernsey-source income must register using the Company Registration Form, after which it receives a Tax Reference Number. Registration is a legal requirement, not a formality you can defer.
In nearly all cases, yes. The Income Tax Law requires a non-resident individual to have a locally based agent who deducts tax, submits the annual return, and handles assessment and collection. Managing your own affairs directly is allowed only by prior written concession from the Revenue Service.
All Guernsey companies must file online through the MyGov platform at my.gov.gg, using a registered organisation account. There is no paper return for companies, and the online form is usually pre-populated with existing details.
Both the 2025 personal and corporate returns are available online and due by 30 November 2026. From the 2025 year onwards, the 30 November deadline applies as the standard date, and an automatic penalty follows any return received late.
The Director can assess income not previously assessed at any time up to six years after the end of the year of charge in which the income arose. This lookback window is relevant where advisers are arranging retrospective compliance for a foreign-owned entity.
Unresolved appeals are heard by the Guernsey Revenue Service Tribunal, an independent body of nine members appointed by the Royal Court that has operated since 1 January 2022. An appeal must be lodged within 30 days of the assessment's issue, and a further point of law can be taken to the Ordinary Court by case stated.
Legal Disclaimer
The information provided in this article is for general informational purposes only and does not constitute legal, tax, or professional advice. While we strive to ensure the accuracy and timeliness of the content, laws and regulations are subject to change, and the application of laws can vary widely based on specific facts and circumstances.
Readers should not act upon this information without seeking professional counsel tailored to their individual situation. Expanship and its authors disclaim any liability for actions taken or not taken based on the content of this article.
For specific advice regarding your business setup, compliance requirements, or any legal matters, please consult with qualified legal and tax professionals in the relevant jurisdiction.
