You've sold the house, cashed in a pension, or simply landed with a significant sum in your account. Now you're living in France — or about to — and you're wondering what to do with the money. The good news: France actually offers some excellent investment options for expats, including one of the most tax efficient savings vehicles in Europe. The not-so-good news: the rules are different from what you're used to in the United Kingdom, and the wrong move can cost you more than you'd expect.
How to invest a lump sum in France
What was tax efficient back home is generally not tax efficient in France. ISAs and Premium Bonds, for example, are fully taxable once you become a French resident. That's the first thing most British expats discover — often too late.
The second thing is that France has its own logic when it comes to tax planning, and once you understand it, it starts to make sense. Becoming a French tax resident changes everything: your income, your assets, your estate, and your pension are all subject to French tax laws. Double taxation treaties exist, but they don't eliminate your obligations — they just determine which country gets paid first.
That's where planning ahead makes a real difference. The timing of asset sales, pension withdrawals, and property purchases can all affect your overall tax position. A few decisions made before you cross the border — or in your first months as a resident — can save you a significant amount over the long term.
This article walks you through the main options for managing a lump sum as an expat in France: from assurance vie to investment funds, from retirement planning to estate planning. It's not personal financial advice — you'll need a qualified adviser for that — but it gives you a solid map of the terrain before you start talking to the professionals.
The timing of your move matters more than you think
The moment you become a French tax resident, France taxes your worldwide income and gains. This means that if you sell assets, crystallise gains, or make major financial decisions after your move, French tax rules apply in full.
If possible, complete major transactions before you leave the UK. Sell assets while you are still a UK tax resident. Take pension lump sums before your departure if appropriate. Time your move carefully — even a few weeks can make a significant difference to your tax position.
This is where a qualified cross-border financial adviser earns their fee. The window around your move is the most valuable period for tax planning, and it closes the moment you establish French residency.
Understanding your tax situation as a new French resident
Once you are resident in France, your lump sum does not sit in a vacuum. France will want to know where it came from, how it is invested, and what income it generates.
France taxes investment income at a flat rate of 30% — the Prélèvement Forfaitaire Unique (PFU), made up of 12.8% income tax and 17.2% social charges. You can elect to be taxed at the progressive income tax scale instead, which may be more favourable depending on your total income.
Capital gains on assets sold after you become a French resident are taxed at the same 30% flat rate. Your ISA loses its tax-free status — France does not recognise the ISA wrapper, and any gains or income generated within it become fully taxable.
The good news is that France offers its own highly tax-efficient investment vehicle — the assurance vie — which is specifically designed for situations like yours.
Assurance vie: France's most tax-efficient investment product
The assurance vie is a French life insurance contract — but it functions very differently from a UK life insurance policy. It is the most widely used investment vehicle in France, and for good reason.
You invest a lump sum into an assurance vie contract. The money is managed within the contract, invested across a range of funds — from low-risk euro funds with a guaranteed return to higher-risk unit-linked funds with greater growth potential.
The tax advantages are significant. After 8 years, withdrawals benefit from a reduced tax rate and a personal allowance of €4,600 per year (€9,200 for couples) on gains. Before 8 years, the flat 30% PFU applies on the gain element of any withdrawal only — not on the full amount withdrawn.
For inheritance planning, the assurance vie is equally powerful. Up to €152,500 per beneficiary can be passed on outside of French succession tax rules, making it an essential tool for estate planning in France.
An assurance vie contract is not a deposit account. It is a medium to long-term investment vehicle. It suits investors with a time horizon of at least 8 years who want to grow their capital in a tax-efficient way while living in France.
What about keeping money in UK accounts?
Many British expats keep significant funds in UK bank accounts after moving to France. This is perfectly legal, but there are tax implications you need to understand.
Interest earned on UK savings accounts is taxable in France as a French resident. You must declare all foreign bank accounts on your French tax return each year — failure to do so can result in significant penalties.
Currency risk is also a real consideration. If your savings are in pounds sterling and your expenses are in euros, exchange rate movements can erode your purchasing power over time. A multi-currency account or a currency management strategy can help stabilise your finances.
Some UK investment platforms will restrict or close your account when you notify them of a foreign address. Checking this before your move — and switching to an expat-friendly platform if necessary — avoids being forced into hasty decisions at the wrong moment.
Offshore investment bonds: a flexible alternative
An offshore investment bond — typically based in Malta, Gibraltar, or the Isle of Man — is another tax-efficient option for expats in France. Like the assurance vie, it is a life insurance wrapper that holds your investments and defers tax until you make a withdrawal.
The key advantage is flexibility. Offshore bonds are internationally mobile — if you move countries again in the future, the bond moves with you without triggering a tax event. They are available in multiple currencies, which helps manage exchange rate risk.
Gains within the bond roll up free of French tax until withdrawal. When you do withdraw, the gain element is taxed in France. Up to 5% of the original investment can be withdrawn each year without an immediate tax charge — a useful income planning tool.
Offshore bonds work best for larger lump sums — typically £100,000 or more — where the tax deferral and planning flexibility justify the management costs involved.
Real estate: investing your lump sum in French property
Many expats use part of their lump sum to buy property in Provence. This is a valid strategy — but it is not without tax implications.
Rental income from French property is taxable in France. If your net real estate assets exceed €1.3 million, France's wealth tax (IFI) applies. Capital gains on the sale of a French property are taxed at 19% income tax plus 17.2% social charges, subject to holding period abatements — your main home is exempt.
Buying property with part of your lump sum and investing the remainder in an assurance vie is a combination that many expats in Provence find well-suited to their situation. One provides a home, the other provides tax-efficient growth and income.
Inheritance and succession planning
France uses forced heirship rules. Your children have a legal right to a share of your estate — regardless of your will. This affects how you structure your assets, particularly if you have a blended family or wish to leave your estate to a partner who is not your spouse.
The assurance vie bypasses forced heirship rules for amounts up to €152,500 per beneficiary. Offshore bonds can also provide flexibility in how your estate is distributed. Both tools are worth considering as part of a broader succession plan.
If you hold significant assets across the UK and France, you may need both a UK will and a French will to ensure your wishes are respected in both jurisdictions. A cross-border estate planning specialist can help you structure this correctly.
Finding the right financial adviser
Managing a significant lump sum across two tax systems is genuinely complex. The stakes are high, the rules are technical, and the cost of getting it wrong — in tax paid unnecessarily, in poorly structured investments, in inheritance planning errors — can run into tens of thousands of pounds.
The choice of adviser matters enormously. Not all financial advisers understand the France-UK corridor. A generalist UK adviser will not know the assurance vie. A French adviser may not understand your ISA, your pension lump sum, or your UK tax history. You need someone who operates across both systems — and who is regulated in both jurisdictions.
Look for an adviser who is fully transparent about their fees. Fee-based advisers — who charge a fixed fee rather than earning commission on the products they sell — tend to give more objective advice. Ask them directly: how do you charge, and what do you earn if I take your recommendation?
Experience with expats specifically matters too. The France-UK financial planning corridor has its own quirks — the assurance vie, the NT tax code, the S1 form, the ISA trap, the QROPS decision. An adviser who has guided dozens of British expats through this process will anticipate problems you have not even thought of yet.
Finally, act before you move — not after. The planning window around your departure from the UK is the most valuable period in your entire expat financial life. Once you are a French tax resident, options close. Decisions that could have been made tax-free become taxable. The right adviser will tell you this on your first call.
We can help you find the right adviser. If you are moving to France and need guidance on managing a lump sum, we work with regulated, fee-based cross-border financial advisers who specialise in the France-UK corridor.
