Tool
Netherlands Forex Tax Calculator 2026
Calculate your Dutch Box 3 tax on forex broker accounts and investments. Compare the deemed-return system against your actual gains to see when Box 3 works for or against you.
Box 3 Tax
EUR 1.462,29
0,97% of assets
Deemed Return
EUR 4.061,90
4,40% weighted avg
Actual Gains
EUR 15.000,00
on 15% return
Effective Tax Rate
9,75%
on actual gains
Box 3 saves you EUR 3.937,71 compared to a hypothetical 36% tax on actual gains. Your 15% return exceeds the 4,40%deemed return — the surplus is effectively tax-free.
| Category | Value | Deemed Rate | Deemed Return |
|---|---|---|---|
| Bank savings (banktegoeden) | EUR 50.000,00 | 1.44% | EUR 443,12 |
| Investments (overige bezittingen) | EUR 100.000,00 | 5.88% | EUR 3.618,79 |
| Tax-free threshold | −EUR 57.684,00 | — | — |
| Taxable Box 3 base | EUR 92.316,00 | 4,40% avg | EUR 4.061,90 |
| Box 3 tax (36%) | EUR 4.061,90× 36% | EUR 1.462,29 | |
Box 3 vs Actual-Gains Taxation (Other EU Countries)
If your actual return (15%) were taxed directly instead of via deemed returns, here is how Box 3 compares to other EU countries.
| Country | Rate | Tax on EUR 15.000 | vs Box 3 |
|---|---|---|---|
| Netherlands (Box 3) | 9,75% eff. | EUR 1.462,29 | — |
| Germany | 26.375% (Abgeltungsteuer + Soli) | EUR 3.956,25 | -2.493,96 |
| France | 30% PFU flat tax | EUR 4.500,00 | -3.037,71 |
| Belgium | 0% (bon père de famille) | EUR 0,00 | +1.462,29 |
| Italy | 26% imposta sostitutiva | EUR 3.900,00 | -2.437,71 |
| Ireland | 33% CGT | EUR 4.950,00 | -3.487,71 |
Positive values = Box 3 costs more than that country. Negative = Box 3 is cheaper. Belgium 0% assumes the bon père de famille classification (normal asset management, not speculation).
Break-Even Analysis
Your Box 3 tax of EUR 1.462,29 is fixed regardless of actual returns. If the Netherlands taxed actual investment gains at 36% instead:
- • You would need a 4,06% annual return on your investments to pay the same amount.
- • Above 4,06%, Box 3 is cheaper than actual-gains taxation. Below it, you overpay.
- • At your 15% return, Box 3 costs you EUR 3.937,71 less than a 36% tax on actual gains.
How Dutch Box 3 Tax Works for Forex Traders
The Netherlands is unique in the EU: it does not tax actual capital gains on savings and investments. Instead, Box 3 (sparen en beleggen) taxes a fictional “deemed return” (forfaitair rendement) based on your asset composition as of 1 January. The deemed return is taxed at a flat 36%, regardless of what you actually earned or lost.
For forex traders, this creates a structural asymmetry. Your broker account balance is classified as overige bezittingen(investments), which carries a deemed return of 5.88%(2025). If your actual return exceeds 5.88%, the surplus is effectively untaxed. If your actual return is lower — or negative — you still owe Box 3 tax on the fictional gain.
The Three Box 3 Categories
Since 2023, Box 3 splits assets into three categories, each with its own deemed return rate:
| Category | 2025 Rate | What It Covers |
|---|---|---|
| Banktegoeden | 1.44% | Bank deposits, savings accounts under deposit guarantee |
| Overige bezittingen | 5.88% | Forex broker accounts, stocks, funds, crypto, real estate (not primary home) |
| Schulden | 2.47% | Non-mortgage debts (consumer loans, margin debt, tax debts) |
Forex broker accounts — including cash sitting idle in the account — are always classified as overige bezittingen, not bank savings. This is an important distinction: cash in a Pepperstone or Exness account attracts the 5.88% deemed rate, not the 1.44% savings rate, even if it is uninvested.
The Hoge Raad Ruling and What Comes Next
On 24 December 2021, the Dutch Supreme Court (Hoge Raad) ruled that the pre-2023 Box 3 system violated the European Convention on Human Rights. The old system applied a uniform deemed return to all assets regardless of composition, forcing savers to pay tax on fictional returns they never earned. The government introduced the current category-specific system as a temporary fix.
A definitive system based on actual returns(werkelijk rendement) was planned for 2027 but has been delayed to at least 2028. When implemented, it would tax real gains, losses, dividends, and (likely) unrealised appreciation. For profitable forex traders, this transition will increase tax if their returns exceed the current deemed rate. For those earning below the deemed rate — or losing money — actual-return taxation is fairer.
Box 3 vs Actual-Gains Tax: When Does Box 3 Save Money?
Box 3 is advantageous for traders whose annual returns consistently exceed the deemed rate for their asset class. With a 5.88% deemed rate and 36% tax rate, the effective tax ceiling on a pure-investment portfolio is approximately 2.12%of assets per year — regardless of actual gains. A trader earning 20% annually on EUR 200,000 pays EUR 2,847 in Box 3 tax, compared to EUR 14,400 under a hypothetical 36% actual-gains regime.
The risk is the reverse scenario: a trader who loses 10% still owes EUR 2,847. Unlike Germany (which allows loss carryforward against future gains) or France (10-year carryforward), the Netherlands provides no mechanism to recover Box 3 tax paid on fictional returns during losing years. This is the structural injustice the Hoge Raad identified.
Filing Requirements
Report the value of all Box 3 assets as of 1 Januaryof the tax year via Mijn Belastingdienst. Foreign broker accounts must be declared under buitenlands vermogen(foreign assets). Under CRS, EU-regulated brokers report account balances directly to the Belastingdienst, making non-disclosure readily detectable.
Fiscal partners can allocate Box 3 assets between them to optimise the tax position. The standard approach is to split equally to maximise both tax-free thresholds, but asymmetric allocation may be beneficial if one partner has significant Box 1 deductions.
Important Limitations
This calculator uses 2025 confirmed deemed return rates. The Belastingdienst publishes updated rates each year based on market benchmarks; the 2026 rates will be available in late 2025. Box 3 applies to the value of assets on 1 January — movements during the year do not affect the calculation. If your trading constitutes a business (onderneming), profits may fall under Box 1 (work and home) at progressive rates up to 49.5%, not Box 3. Consult a belastingadviseur for personalised advice.
Frequently Asked Questions
What is Box 3 and how does it work?
Box 3 (sparen en beleggen) is the Netherlands’ tax category for savings and investments. Unlike most countries, the Netherlands does not tax actual capital gains on investments. Instead, it taxes a “deemed return” (forfaitair rendement) — a fictional return the government assumes you earned based on your asset composition. The deemed return is taxed at a flat 36%. This means you pay the same Box 3 tax whether your forex account gained 50% or lost 20%.
What are the Box 3 deemed return rates for 2025?
For the 2025 tax year: bank savings (banktegoeden) are deemed to return 1.44%, investments and broker accounts (overige bezittingen) 5.88%, and debts (schulden) have a deemed cost of 2.47%. These rates are set annually by the Belastingdienst based on observable market benchmarks. Forex broker account balances are classified as “overige bezittingen” (investments), not savings — they receive the higher 5.88% deemed rate.
When is Box 3 better than taxing actual gains?
Box 3 is advantageous when your actual return exceeds the deemed return rate for your asset class. For investments (5.88% deemed return in 2025), if your forex account returns more than approximately 5.88% per year, the excess is effectively untaxed. A trader earning 20% annually on a EUR 100,000 broker account pays Box 3 tax on a deemed EUR 5,880 return, not the actual EUR 20,000 gain — saving roughly EUR 5,083 compared to a hypothetical 36% tax on actual gains.
What did the Hoge Raad rule about Box 3?
On 24 December 2021 (ECLI:NL:HR:2021:1963), the Hoge Raad (Dutch Supreme Court) ruled that the old Box 3 system violated Article 1 of the First Protocol to the European Convention on Human Rights. The old system applied a single fictional return to all assets regardless of composition. The government introduced the current category-specific system as a “temporary” fix (2023–2026), with a definitive system (taxing actual returns) planned for 2027, since delayed to 2028 or later.
Is my forex broker account classified as savings or investments?
Forex broker accounts are classified as “overige bezittingen” (other assets / investments), not “banktegoeden” (bank savings). This means they receive the higher deemed return rate of 5.88% (2025), not the 1.44% savings rate. Only balances held in Dutch or EU-regulated bank accounts where the depositor guarantee scheme applies qualify as “banktegoeden.” A Pepperstone, Exness, or BlackBull trading account is explicitly an investment, even if cash is sitting idle in the account.
How do I report my foreign broker account in Box 3?
Report the total value of your foreign broker account(s) as of 1 January of the tax year under “overige bezittingen” in your Box 3 declaration. File via Mijn Belastingdienst. Under the Common Reporting Standard (CRS), EU-regulated brokers automatically report your account balance and income to the Dutch Belastingdienst, so non-disclosure is readily detectable. You must also declare the account in your “buitenlands vermogen” (foreign assets) section.
Can fiscal partners optimise their Box 3 allocation?
Yes. Fiscal partners (married couples or registered partners filing jointly) can freely allocate Box 3 assets between them, provided the total equals their combined holdings. The combined tax-free threshold is EUR 115,368 (2 × EUR 57,684). Optimal allocation typically means assigning more assets to the partner with lower other income, or splitting exactly equally to maximise both thresholds. The calculator uses the combined threshold when “fiscal partners” is selected.
What happens when the Netherlands switches to actual-return taxation?
The government plans to replace the deemed-return system with actual-return taxation (“werkelijk rendement”), initially planned for 2027 but delayed to at least 2028. Under the proposed system, you would be taxed on actual gains, losses, dividends, and unrealised appreciation. This would remove the Box 3 advantage for high-return traders but also eliminate the current injustice of paying tax on fictional gains during losing years. The transition timeline remains uncertain — legislative drafts are still under consultation.
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