Most buyers approach a French mortgage as a funding question: how much can I borrow, and at what rate? That is the right first question. It is rarely the most valuable one.

Used deliberately, euro-denominated debt is one of the more effective planning tools available to an international owner of French property. It reduces the base on which France’s wealth tax is charged, it shelters rental income, and it can significantly lower the cost of transferring property to the next generation. None of these effects are loopholes — they are the ordinary consequence of how French tax law treats liabilities.

Here is how each one works.

1. Reducing exposure to IFI wealth tax

France abolished its general wealth tax in 2018 and replaced it with the Impôt sur la Fortune Immobilière, a tax charged specifically on real estate. It bites once net taxable property assets exceed €1.3 million on 1 January. French tax residents are assessed on their worldwide property; non-residents are assessed on their French property alone.

The rates are progressive. Once the threshold is crossed, the charge is calculated from €800,000 upwards — 0.5% to €1.3 million, 0.7% from €1.3 million to €2.57 million, 1% to €5 million, 1.25% to €10 million and 1.5% above that. A partial relief, the décote, softens the cliff edge for estates between €1.3 million and €1.4 million.

The critical word is “net”. Debt taken out to acquire, construct, repair, maintain or improve a taxable property is deducted from that property’s value. A couple holding a €2.5 million French home outright face a meaningful annual charge. The same couple holding the same home with €1.4 million of acquisition debt may sit outside the net altogether in the early years.

Two caveats matter. First, interest-only structures are treated on a degressive basis, with a notional amount of capital deemed repaid each year, so the deduction erodes over time. Second, for larger estates a cap restricts the proportion of debt that can be deducted. Both are reasons to structure the loan with advice rather than assume the benefit.

There is also a valuation point worth knowing: a French main residence attracts an automatic 30% reduction from market value before IFI is calculated.

2. Sheltering rental income

If the property is let, financing costs stop being a cost and start being a deduction.

Under the régime réel, loan interest is deductible from rental income. This applies to unfurnished lettings taxed as revenus fonciers and to furnished lettings under the LMNP regime taxed as bénéfices industriels et commerciaux. The deduction is not limited to interest: arrangement fees, guarantee and mortgage registration costs, release fees and associated bank charges are generally deductible too.

For a non-resident landlord, this is often the difference between a French tax liability and none. A property yielding €30,000 a year with €18,000 of interest and running costs presents a very different picture to the tax office than the same property owned free of debt.

The distinction to keep in mind is that the flat-rate micro regimes offer a fixed allowance instead of actual expenses. Where a property carries real debt, the régime réel is almost always the better election — but the choice has consequences and should be made with an accountant.

One thing France does not offer: interest on a main residence is not deductible against general income. The relief that once existed was withdrawn many years ago and has not returned.

3. Passing property on for less

This is the benefit most buyers have never heard of, and for families it can dwarf the others.

Where a French property is held through a société civile immobilière — an SCI — the asset passed to the next generation is not the building but the shares in the company. And those shares are valued net of the company’s liabilities. In broad terms:

Value of the shares = value of the property − the SCI’s debt

A property worth €1.2 million inside an SCI carrying €700,000 of mortgage debt supports a share valuation in the region of €500,000. Gifts of shares are assessed on that reduced figure, not on the gross property value.

Layer on France’s standard gift allowances — €100,000 per parent, per child, renewable every fifteen years — and a phased transfer becomes considerably more efficient. A couple with two children can move €400,000 of value within a single fifteen-year window before gift tax applies at all. Add the option of gifting bare ownership while retaining a life interest, where the taxable value is discounted according to the donor’s age under the statutory scale, and the planning space widens further.

The important sequencing point: this works best while the debt is still substantial. Waiting until the mortgage is repaid removes the very discount that makes the strategy effective.

A word of caution

Every one of these advantages depends on how the loan and the ownership structure are put together at the outset. An SCI created for the wrong reasons can create problems — particularly for US and UK taxpayers, where the entity may be characterised unhelpfully by their home tax authority. The IFI debt rules contain deliberate anti-avoidance provisions. And the interaction between French relief and the tax you pay at home is governed by treaty, not by convenience.

The tax benefits are real. They are not automatic.

Talk to BlueSky

BlueSky Finance arranges mortgages for expatriates and non-resident buyers across France, and works alongside your notaire, accountant and wealth adviser to make sure the financing supports the wider plan rather than cutting across it. If you would like to understand how a euro mortgage could sit within your tax position, contact our team for an initial conversation.