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Using Wise in France? Here's What You Need to Declare on Your Tax Return (2026)

Wise interest and cashback is taxable income for French residents — and Wise, operating through Belgium, withholds tax at source at a rate the France-Belgium treaty doesn't fully permit. Here's what to declare, how the tax credit works, and how to reclaim the excess from Belgium.

26 May 2026

Wise is one of the most widely used financial tools among UK expats in France — for currency conversion, holding balances in multiple currencies, and day-to-day payments. What many people don't realise is that the interest Wise pays on those balances, and the "cashback" it pays on card spending, are both taxable income in France. Because Wise operates through Wise Belgium SA, the situation involves Belgian withholding tax, a France-Belgium treaty credit mechanism, and a potential reclaim from the Belgian tax authority.

None of this is complicated once you understand it — but it has more moving parts than a standard UK bank interest declaration, and it catches a lot of people out.

This article covers what Wise pays, why Belgium is involved, how the withholding tax works, exactly how to declare it on your French return, and what to do about the excess withholding.

For the general framework for declaring foreign investment income in France, see our guide to PFU vs Progressive Tax: Which Is Better for Your Investment Income?. For the full walkthrough of Form 2047 and how foreign income declarations work, see Form 2047 Explained: How UK Expats Declare Foreign Income in France.

What Wise Pays — and Why It's Taxable

Wise offers two types of payments that are relevant here:

Interest on balances: Wise pays interest on balances held in its accounts — including EUR and USD balances. This is straightforward investment income, taxable in France in the same way as interest from any other foreign bank account.

"Cashback" on card spending: Wise markets this as cashback, but it is not a refund of fees or a discount — it is a percentage payment calculated on your spending and paid to your account. The French tax authority treats this as interest income, not a rebate. "Cashback is usually a percentage payment based on expenditure on the account and is taxable as interest. A refund of fees would not be taxable."

The distinction matters because some people assume cashback is simply money they've already spent being returned to them — and therefore not income. It isn't. It's a new payment, and it's taxable.

Why Belgium Is Involved

Wise is not a UK bank operating in France. Your EU Wise account is held with Wise Belgium SA, the EU entity through which Wise operates for European customers. This means:

• The interest and cashback Wise pays comes from a Belgian source, not a UK source
• Belgian withholding tax rules apply at the point of payment
• The France-Belgium double tax treaty governs how that Belgian tax is treated in France
• Any excess withholding above the treaty rate must be reclaimed directly from the Belgian tax authority (SPF Finances / FOD Financiën)

This is different from interest received from a UK bank, where the UK generally does not withhold tax at source for French residents, and any withholding that does occur has no French credit mechanism — it must be reclaimed from HMRC.

For an overview of how social charges apply to investment income in France, see Social Charges in France: CSG, CRDS and How They Affect UK Expats.

The Withholding Tax Problem

Wise Belgium currently withholds tax at 30% at source on interest and cashback payments.

The France-Belgium double tax treaty caps the withholding rate on interest at 15%. France will only credit the treaty-permitted rate — it will not credit the excess.

This means the 30% Wise withholds breaks down as follows:

So if Wise withholds €20 on €66 of cashback (approximately 30%), only €10 of that is creditable in France. The other €10 has been withheld by Belgium in excess of the treaty rate and needs to be reclaimed directly from Belgium.

Is it worth reclaiming from Belgium? On small amounts like €10, probably not — the administrative effort will outweigh the refund. But if your Wise balances are significant and the excess withholding adds up across the year, it can become worthwhile. The process involves submitting a reclaim to SPF Finances using the Belgian non-resident refund procedure.

How to Declare It on Your French Return

The declaration for Wise interest and cashback uses a different route on Form 2047 than UK bank interest — because a tax credit applies.

There are two routes for foreign interest on Form 2047:

• Route A (no tax credit): Used for UK interest and other countries where no French credit mechanism exists. Lines 240 → 250 → 251 → 252 → Box 2TR on Form 2042.
• Route B (with tax credit): Used for Belgian interest and other countries where a treaty credit applies. This is the route for Wise.

Route B — step by step for Wise interest and cashback:

Step 1: Form 2047, Lines 231–238 — Declare the gross income and withheld tax

Enter the gross amount (before any Belgian withholding) in the income column for Belgium. Enter the Belgian tax withheld in the tax column. Use the full gross figure — not the net amount Wise actually paid you.

Convert all amounts to euros using the exchange rate applicable on the date of receipt. For euro-denominated Wise accounts this is straightforward. For USD or other currency balances, you will need to convert each payment at the rate on the date it was received.

Step 2: Form 2047, Lines 251 and 252 — Total interest

The gross interest total carries forward to Lines 251 and 252. Line 252 then transfers to Box 2TR on Form 2042 — this is where all foreign interest (from all countries) is consolidated for income tax purposes.

Step 3: Form 2047, Section 7 (Crédit d'impôt imputable), Line 70 — The credit calculation

This is the part that trips most people up, and it is genuinely counterintuitive.

The French credit for Belgian interest is not simply the Belgian tax you actually paid. Instead, it is a crédit d'impôt égal à l'impôt français — a credit equal to the French tax on that income. France calculates what French income tax is due on the Wise interest, and that calculated figure is the credit. It is entered on Line 70 of Section 7 on Form 2047.

That credit then transfers to Box 8TA on Form 2042 C, where it offsets your French tax liability.

The practical effect is that you are not double taxed on the Belgian-source income — the French tax on that income is wiped out by the credit. But the credit is capped at the French tax due, not the Belgian tax paid. If France's tax on your Wise income is less than the treaty-permitted 15% Belgium withheld, France won't refund the difference — that's what the Belgian reclaim procedure is for.

Step 4: Form 3916 — Declare the Wise account itself

Separately from the income declaration, you must declare the existence of your Wise account on Form 3916 each year. Wise Belgium is a foreign financial account and must be declared regardless of whether you received income, and regardless of the balance.

If you hold both a Wise EUR account and a Wise USD account (or other currency accounts), each is a separate account and each needs its own 3916 entry.

New to Wise?

Wise has millions of users in France and the automatic exchange of information between EU member states (under DAC and its extensions) means the DGFiP is increasingly able to cross-reference declarations against account data. Declaring correctly is straightforwardly the right thing to do — and the forms, once you know the route, are not especially onerous.

If you're not already using Wise, it remains one of the most cost-effective ways to manage multi-currency finances as an expat — low fees, real mid-market exchange rates, and multi-currency balances in one account.

Open a Wise account →

Interest on USD and Other Non-Euro Balances

If you hold a Wise USD balance and earn interest on it, the declaration follows the same Route B process above — the income is still from Wise Belgium, so Belgian withholding still applies and the same credit mechanism is used.

The additional complication is currency conversion. You must convert each interest payment to euros at the exchange rate on the date of receipt — not a year-end rate, not an annual average. For the conversion methodology accepted by the French tax authority, see our exchange rate guide.

Common Mistakes

1. Not declaring cashback because it "feels like" a discount. Wise cashback is taxable interest income. The test is whether it is a new payment based on activity — it is, so it's taxable. A genuine fee refund would not be taxable, but cashback calculated as a percentage of spending is not a fee refund.

2. Using Route A (the UK interest route) for Wise income. Because many UK expats are familiar with declaring UK interest, they apply the same route to Wise. But Wise is Belgian, and the treaty credit mechanism means Route B is required. Using Route A means you miss the Section 7 credit and pay more tax than you owe.

3. Declaring the net amount instead of the gross. You must always declare the gross amount before Belgian withholding. The credit mechanism works on the gross figure — if you declare the net, both your income and your credit will be wrong.

4. Crediting the full 30% withheld. France will only credit the treaty-permitted element. Entering the full 30% withheld in Box 8TA will produce an incorrect credit figure and could trigger a query from Impôts.

5. Forgetting Form 3916. The income declaration and the account existence declaration are two separate obligations. Many people file their interest correctly and don't realise the account itself also needs to be declared annually.

6. Not reclaiming the excess Belgian withholding. If Wise has withheld 30% and the treaty only permits 15%, the excess 15% is sitting with SPF Finances. It won't come back automatically — you need to claim it. For small annual amounts it may not be worth the effort, but it's worth tracking if your Wise balances generate meaningful interest.

Frequently Asked Questions

I only received a few euros of Wise cashback. Do I really need to declare it?

Yes. There is no de minimis exemption for foreign interest income in France — all amounts, however small, must be declared. The Form 3916 account declaration is also required regardless of the income amount. In practice, very small amounts produce negligible tax, but the declaration obligation still applies.

Does this apply to Revolut, Monzo and other similar platforms?

It depends where those platforms are incorporated and whether they pay interest on balances. Revolut, for example, operates through Revolut Bank UAB in Lithuania — so Lithuanian withholding rules and the France-Lithuania treaty would apply rather than the Belgium rules. Each platform needs to be checked individually. The principle is the same: identify which country the income comes from, find the relevant treaty, and use the appropriate Form 2047 route. The same Form 3916 account declaration obligation applies to all foreign accounts.

Wise withheld 30% — can I just credit all of it in France?

No. The France-Belgium treaty caps the creditable withholding at 15%. You can only enter the treaty-permitted credit amount in Box 8TA. The excess 15% must be reclaimed from the Belgian tax authority (SPF Finances) separately. Entering the full 30% in Box 8TA would overstate the credit.

How do I reclaim the excess Belgian withholding?

You need to submit a non-resident refund claim to SPF Finances (Belgium's federal tax authority). The process involves completing a Belgian refund form and providing evidence of French tax residency — typically your French Avis d'Impôt. The Belgian tax authority website (finances.belgium.be) has the relevant forms. The reclaim can be submitted after you have filed your French return for the year in which the excess was withheld. For small amounts, many people decide the effort isn't worthwhile, but for larger Wise balances it is worth pursuing.

I didn't declare my Wise income in previous years. What should I do?

Contact your local tax office (Service des Impôts des Particuliers) and make a voluntary amended declaration (déclaration rectificative) for the relevant years. Proactive disclosure is treated more favourably than waiting to be identified. You may also need to file retrospective Form 3916 declarations for the account. The three-year audit window means Impôts can look back three years, so it is better to regularise promptly.

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