Financial Planning in Mayotte: A Guide for Expats and International Investors

Mayotte is an archipelago of two main islands in the Indian Ocean, located between the northern coast of Madagascar and the northern tip of Mozambique. It is France's most recently created overseas department (département et région d'outre-mer — DROM), having voted by 95.2% to become a French department in the 2009 referendum and completing departmental status in 2011.

With a population of approximately 310,000 to 350,000 (estimates are uncertain due to irregular immigration from the Comoros), Mayotte is France's smallest and most populous overseas department relative to its area, and one of the most socially and economically complex. The per capita GDP is the lowest in France but the highest in the Indian Ocean region, creating significant irregular immigration pressure from neighbouring Comoros.

For internationally mobile individuals, Mayotte is relevant as a French overseas department using the euro and subject to French law — though with important transitional adaptations. It may also be relevant for Comorian diaspora planning, development sector workers, or those connected to the French Indian Ocean region more broadly.

Compliance note: Mayotte's alignment with metropolitan French tax law is progressing through a transition programme. The position may differ from metropolitan France in specific respects. Nothing in this guide constitutes tax or legal advice. Seek qualified French and local professional guidance. Investments can fall as well as rise.

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Political and Legal Status

Mayotte is legally:

• A French overseas department (DROM) — part of the French Republic
• An outermost region (RUP) of the European Union
• Subject to French national law, with transitional adaptations as it aligns fully with metropolitan standards

Critically, Mayotte is not part of the Comoros — despite the Comoros claiming sovereignty. The four islands of the Comoros archipelago include Mayotte, but Mayotte chose French status and has maintained it. The African Union and Arab League support the Comoros position; France and the EU recognise Mayotte as French territory. This dispute has no direct practical financial planning implication for most clients, but creates ongoing bilateral tensions.

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Tax Residency Rules

As a French department, Mayotte is in principle subject to French tax law — including French personal income tax (IR — Impôt sur le Revenu). However, Mayotte has undergone a progressive transition toward full metropolitan French tax application, and certain transitional measures apply or have applied.

For practical purposes as of 2026, French income tax rules broadly apply in Mayotte for tax residency and income tax purposes. Tax residency is determined by the same criteria as metropolitan France:

• Habitual domicile (foyer) in France (including Mayotte)
• Principal place of abode
• Professional activity in France
• Centre of economic interests in France

There is no separate UK-Mayotte DTA. The UK-France DTA covers France, and the question of whether it extends to French overseas departments including Mayotte should be verified with a specialist — French DTAs have historically had specific provisions on overseas territories.

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Income Tax

French income tax rates apply in Mayotte following the progressive alignment. The metropolitan French progressive income tax bands (revised annually under Finance Acts) apply:

• Up to EUR 11,600: 0%
• EUR 11,601–29,579: 11%
• EUR 29,580–84,577: 30%
• EUR 84,578–181,917: 41%
• Above EUR 181,917: 45%

(2026 bands, set by the Finance Act for 2026 and applied to 2025 income; thresholds are revalued for inflation each year.)

Note: Mayotte's income levels are significantly lower than mainland France, meaning most residents fall in the lower bands. The quotient familial (family quotient) system applies to reduce the effective rate for families with dependants.

Transitional provisions: Mayotte has had additional tax incentives as part of its departmentalisation transition. Specific French overseas territory tax incentives (such as the Girardin defiscalisation schemes applicable to DOM generally) may apply. These allow investors resident in mainland France to obtain income tax reductions by investing in productive equipment or social housing in the overseas departments. Specialist advice is essential.

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Capital Gains Tax

French CGT rules apply in Mayotte as part of the departmentalisation alignment. Key features:

• Real estate gains: 19% flat rate (plus social charges of 17.2% for EU/EEA residents, or alternative rates for non-residents). Taper relief applies for long-held property (full exemption after 30 years).
• Securities gains: 30% (prélèvement forfaitaire unique — PFU flat tax), comprising 12.8% income tax + 17.2% social charges. Option to apply the progressive income tax scale if more favourable.
• Primary residence: Exempt from CGT in France.

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Inheritance and Estate Tax

French inheritance tax (droits de succession) applies in Mayotte. Key features:

• Direct line (parent to child): rates from 5% to 45% depending on amount, after the EUR 100,000 per parent per child allowance
• Spouses/PACS partners: exempt (since 2007 reform)
• Siblings: 35–45% with smaller allowances
• Others: higher rates

Islamic succession law (which historically applied in Mayotte under the "statut personnel de droit local" — a French constitutional accommodation of Islamic personal status law in Mayotte) was reformed. A 2010 law progressively abolished the droit local statut personnel framework, and succession in Mayotte is now governed by general French civil law, not sharia. This is a significant change from historical practice.

Since 6 April 2025, UK inheritance tax is residence-based rather than domicile-based: individuals who are "long-term UK residents" (broadly, UK-resident for at least 10 of the previous 20 tax years) remain within the scope of UK IHT on their worldwide estates, including any Mayotte assets, until they have been non-UK resident for a sufficient period.

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Wealth Taxes

The French Impôt sur la Fortune Immobilière (IFI — Real Estate Wealth Tax) applies to individuals resident in France (including Mayotte) with real estate assets exceeding EUR 1.3 million net. Rates from 0.5% to 1.5%. The broader ISF (which taxed all wealth) was abolished in 2018 and replaced by the IFI limited to real estate.

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Pension Implications: UK Pensions When Living in Mayotte

State Pension: As a French overseas department, Mayotte is part of France and an outermost region of the EU. UK State Pension paid to residents of the EEA is uprated annually under the UK-EU Trade and Cooperation Agreement (and, for those who relocated before 31 December 2020 and meet the conditions, the Withdrawal Agreement). Mayotte residents should therefore generally receive the annual increase, in the same way as metropolitan France residents — unlike most non-EEA destinations where the UK State Pension is frozen. Because the position of individual overseas departments can raise practical questions, confirm your specific entitlement with a specialist.

UK Private Pensions: Without clear DTA coverage, professional advice on the applicable withholding position is essential before drawing UK pension income while resident in Mayotte.

French social security: Mayotte has been progressively aligned with the French metropolitan social security system, though some transitional differences remain. Formal sector workers contribute to French-system health insurance (Assurance Maladie), pension (CNAV — régime général), and family allowances (CAF).

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Banking Environment

Mayotte uses the euro (EUR) — as a French overseas department and EU outermost region, it joined the Eurozone. Major French banks operate in Mayotte:

• BFCOI (Banque Française Commerciale Océan Indien) — the principal local bank
• Banque Populaire / Caisse d'Épargne regional networks
• La Banque Postale — postal banking
• BNP Paribas via its Réunion operations

Full SEPA payment zone participation applies. International wire transfers follow the standard French/EU banking framework. The euro provides complete currency stability relative to other EU/EEA countries.

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Investment Climate

Mayotte's investment environment is shaped by:

• Departmentalisation incentives: French overseas territory investment incentives (Girardin, property depreciation schemes) make investment in DOM territories tax-advantaged for French mainland investors
• Infrastructure development: Significant French state investment in aligning Mayotte's infrastructure with metropolitan standards
• Growing economy: Economic growth has been strong relative to regional peers
• Immigration challenge: Significant irregular immigration from Comoros creates social pressures that are acknowledged in any investment risk assessment
• Tourism potential: Limited currently but the island has natural beauty and potential

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Cost of Living

Moderate relative to metropolitan France but high relative to the Indian Ocean region. Basic costs are subsidised by French state transfers and social policy. Imported goods carry premium prices reflecting logistics costs. French expatriate-standard housing and schooling are available.

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Key Compliance Issues for Expats

1. Full French tax alignment: Treat Mayotte as essentially metropolitan France for tax purposes, with local specialist advice on any transitional differences.
2. UK-France DTA territorial application: Confirm with a specialist whether the UK-France DTA applies to Mayotte for relevant purposes.
3. Girardin investments: These are legitimate French tax incentive products but require careful due diligence — ensure any Girardin operator is properly authorised and the underlying investment is genuine.
4. Immigration context: Property transactions in Mayotte may have specific title questions given the historic droit local and the high rate of informal settlement. Thorough conveyancing due diligence is essential.

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Practical Financial Planning Tips

• French tax framework: French financial and tax planning structures — PEA (Plan d'Épargne en Actions), PER (Plan d'Épargne Retraite), assurance-vie — are available and relevant for Mayotte residents as for metropolitan France residents.
• Girardin/DOM investment schemes: If you are a French tax resident (including in Mayotte) with income tax to offset, DOM investment tax incentives may be worth exploring with a specialist French adviser.
• Estate planning: French inheritance tax and succession law apply. The abolition of the Islamic droit local is now several years old but estate planning for Mayotte families with historical customary succession arrangements should be reviewed.
• UK pension management: Clarify the State Pension uprating position and the DTA application to pension income with a specialist before drawing UK pensions while Mayotte-resident.
• Pre-departure UK planning: Standard French destination pre-departure planning applies — see the France country guide for detailed coverage.

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How Global Investments Can Help

For clients with connections to French overseas territories, including Mayotte, Global Investments can provide:

• UK pre-departure tax planning applying the French tax framework
• Portfolio management in EUR with French financial product access
• Estate planning addressing French IHT, succession law, and UK domicile dimensions
• Pension strategy for UK State Pension and private pensions
• Coordination with specialist French advisers on DOM-specific incentive schemes

We work alongside specialist French tax advisers with overseas department expertise. Contact us to discuss your specific situation.

This guide is for informational purposes only and does not constitute financial, tax, or legal advice. Rules and rates cited are based on information available as of June 2026 and are subject to change. Seek independent professional advice before making any decisions. Investments can fall as well as rise.