Dutch Box 3 Tax 2026: How Savings and Investments Are Taxed

Dutch Box 3 tax works differently from anything most expats have encountered before. It does not tax your actual interest, dividends, or investment gains. It assumes you earned a certain return on your wealth — a deemed return — and taxes that assumption at 36%. If you earned more than the assumed rate, lucky you. If you earned less, that is your problem.

The good news: there are meaningful legal ways to reduce your Box 3 exposure. The bad news for 30% ruling holders: the one option that used to wipe out Box 3 on foreign assets — partial non-resident taxpayer status — was abolished per 1 January 2025 and now survives only for a shrinking transitional group. This guide covers everything — how the calculation works, three concrete examples with actual euro figures, what counts as a Box 3 asset, where the 30% ruling now stands, the ongoing legal reform, and how to file.

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The Dutch Tax Box Structure

The Netherlands taxes income through three separate boxes:

• Box 1 — Income from work and your primary home (salary, freelance income, pension income, imputed rental value of your Dutch home)
• Box 2 — Income from a substantial interest in a company (owning 5%+ of the shares)
• Box 3 — Savings and investments (wealth tax on assets above the threshold)

This guide focuses entirely on Box 3. For the full picture across all three boxes, the Dutch tax return guide for expats is a good companion read. If you are also thinking about the long-term financial picture, our Dutch pension guide covers how pension savings interact with Box 3.

How Box 3 Works in 2026

The Core Mechanism

Box 3 taxes wealth above a threshold using deemed (assumed) returns rather than actual returns. The government sets deemed return percentages for different asset categories each year based on actual average market rates for those categories. You apply those percentages to your taxable wealth, then pay 36% on the resulting deemed return figure.

The 2026 Numbers

Tax-free threshold (heffingsvrij vermogen):

• Single person: €59,357
• Fiscal partners (couple): €118,714 (each partner’s €59,357)

Deemed return rates for 2026 (Belastingdienst, checked 24 September 2026; savings and debt rates are provisional until early 2027):

Tax rate: 36% applied to the total deemed return

The deemed return rates are set annually by the Belastingdienst based on actual average returns in each category for the relevant year. The savings rate in particular has varied significantly — it was near zero during the low-interest years and has moved upward as savings rates recovered.

The Reference Date: January 1

Your Box 3 wealth is measured on January 1 of the tax year, known as the peildatum. This is not an average over the year — it is a snapshot on that single date. For your 2026 tax return (due May 2027), the relevant date is January 1, 2026. For your 2025 return (due May 2026), it is January 1, 2025.

This matters for planning purposes, which I will come back to later.

Three Worked Examples

Example 1: €100,000 in Savings Only (Single Person)

You have one Dutch savings account with a balance of €100,000 on January 1, 2026. No investments, no debts.

Step 1 — Taxable wealth: €100,000 total − €59,357 threshold = €40,643 taxable

Step 2 — Apply deemed return: €40,643 × 1.28% (savings rate) = €520 deemed return

Step 3 — Apply tax rate: €520 × 36% = €187 Box 3 tax

The amount is modest. The savings deemed return of 1.28% is intentionally low to reflect that savings accounts earn relatively little. If that same €100,000 were in an investment portfolio instead, the tax would be dramatically higher — see Example 2 for why.

Example 2: €200,000 Mixed (€80,000 Savings + €120,000 Investments, Single)

You have €80,000 in a savings account and €120,000 in an investment portfolio on January 1, 2026.

Step 1 — Taxable wealth: €200,000 total − €59,357 threshold = €140,643 taxable

Now I need to allocate the taxable €140,643 between savings and investments proportionally.

The ratio of savings to investments in the total portfolio is:

• Savings: €80,000 / €200,000 = 40%
• Investments: €120,000 / €200,000 = 60%

Applied to the taxable €140,643:

• Savings portion: €140,643 × 40% = €56,257
• Investment portion: €140,643 × 60% = €84,386

Step 2 — Apply deemed returns:

• Savings: €56,257 × 1.28% = €720
• Investments: €84,386 × 6.00% = €5,063
• Total deemed return: €5,783

Step 3 — Apply tax rate: €5,783 × 36% = €2,082 Box 3 tax

This is a meaningful amount — and it will be owed regardless of whether your investments actually returned 6.00% or went down in value. That is the sting of the deemed return system.

Example 3: A Couple with €250,000 Total Assets

You and your partner are fiscal partners. Together you have €250,000 in assets: €100,000 in a joint savings account and €150,000 in an investment account.

Step 1 — Combined taxable wealth: €250,000 total − €118,714 threshold (both partners) = €131,286 taxable

Let us say you split 50/50 on your tax returns: each of you declares €65,643 taxable wealth.

For each partner — proportional allocation: Savings proportion of total assets: €100,000 / €250,000 = 40% Investment proportion: €150,000 / €250,000 = 60%

Each partner’s €65,643 split:

• Savings portion: €65,643 × 40% = €26,257
• Investment portion: €65,643 × 60% = €39,386

Deemed returns per partner:

• Savings: €26,257 × 1.28% = €336
• Investments: €39,386 × 6.00% = €2,363
• Total deemed return per partner: €2,699

Box 3 tax per partner: €2,699 × 36% = €972 Combined household tax: €972 × 2 = €1,944

Compare this to Example 2 where a single person with €200,000 mixed assets paid €2,082. The couple with €250,000 total pays slightly less in combined tax — the doubled threshold does significant work when assets are spread across two partners.

What Counts as a Box 3 Asset?

Assets Included in Box 3

• Bank accounts: All Dutch and foreign savings accounts, current accounts (checking accounts), term deposits — at their January 1 balance
• Investment portfolios: Shares, bonds, ETFs, mutual funds held at any Dutch or foreign broker
• Second properties: A holiday home, a buy-to-let, a second property in the Netherlands or abroad
• Foreign real estate: A house or apartment in your home country (see tax treaty caveat below)
• Crypto-assets: Bitcoin, Ethereum and all other crypto tokens at market value on January 1
• Loans you have made: If you have lent money to a family member or friend, this is a receivable in Box 3
• Certain insurance products: Life insurance and annuity policies with an investment component (though there are exemptions for specific products)

Assets Excluded from Box 3

• Your primary Dutch home: This is handled entirely in Box 1 through the eigenwoningforfait (imputed rental value) system. It does not appear in Box 3.
• Employer pension (pensioen): Pension rights built up through a Dutch employer are not included in Box 3. You have not yet received this money, and it is held in a separate pension fund vehicle.
• Banksparen and lijfrente: Recognised Dutch pension savings products. Contributions reduce your Box 1 income and the accumulated balance is excluded from Box 3 until payout.
• Green fund investments up to €26,715 (2026): Investments in officially approved green funds (groene beleggingen) are exempt up to this amount per person.
• Business assets with substantial interest: If you own 5%+ of a company, that stake goes in Box 2, not Box 3.
• Personal possessions: Your car, furniture, jewellery used personally. Collectibles held as pure investment may need to be reported depending on the nature and value, though there is a personal use exception.

The 30% Ruling and Box 3: What Is Left

Partial Non-Resident Status Has Been Abolished

Partial non-resident taxpayer status for Box 2 and Box 3 was abolished with effect from 1 January 2025. The Belastingdienst states it plainly: as of your tax return 2025, you can no longer opt for partial foreign tax liability.

There is one transitional group. If you were already using the 30% ruling before 2024, you may still elect the status up to and including your 2026 tax return — the return filed in spring 2027. After that it is gone for everybody.

So if you arrived recently, this is background rather than a planning option: your worldwide savings and investments go into Box 3 exactly like any other Dutch resident’s, taxed at 36% on the deemed return in 2026. If you are in the transitional group, you have one filing left in which to use it, and it is worth making sure you do.

How It Worked — And What It Is Worth to the Transitional Group

When the election was available, it treated you as a non-resident for Box 3: only Dutch-source assets counted — Dutch real estate and substantial interests in Dutch companies. Everything else was simply not included.

The illustration below therefore applies only if you were already using the ruling before 2024, and only up to your 2026 return.

You moved to Amsterdam from London and have held the 30% ruling since 2023. You have:

• £180,000 in a UK ISA (roughly €210,000)
• €45,000 in a Dutch ING savings account

Filing as a normal resident: Total Box 3 wealth: ~€255,000. After the €59,357 threshold, taxable wealth is ~€196,000. With a mixed savings/investment profile, your annual Box 3 tax could easily exceed €2,000–3,000.

Electing partial non-resident status (transitional group, up to the 2026 return): Your UK ISA is foreign — excluded entirely. Your Dutch savings: €45,000, below the €59,357 threshold. Box 3 tax: zero.

From the 2027 return onwards that same person pays the full resident amount. If that is you, plan for the step-up now rather than discovering it when the assessment lands.

For a full explanation of the 30% ruling and how to apply, see our complete 30% ruling guide. If you want to calculate the financial value of your ruling, the 30% ruling calculator guide walks through the numbers.

Box 3 Reform: What Changed and What Is Coming

The Dutch Box 3 system has been through a genuine legal crisis in recent years. Here is the timeline and what it means for you.

The Old System (Pre-2021)

For many years, the Belastingdienst used fixed, flat deemed return percentages. In years when savings rates were low (near zero during 2015–2021), people with savings-heavy portfolios were effectively being taxed on returns they had no possibility of earning. A tax on a 4% deemed return when actual savings rates were 0.01% is, mathematically, a tax on money you did not receive.

The Kerstarrest (Christmas Ruling, December 2021)

On December 24, 2021, the Dutch Supreme Court (Hoge Raad) issued the kerstarrest — the Christmas ruling. The court held that the flat deemed return system violated Article 1 of Protocol 1 of the European Convention on Human Rights (the right to property) when actual returns were structurally lower than the deemed rates used. This was a landmark ruling with significant financial consequences for the Dutch state.

The Recovery Operation (Rechtsherstel, 2022–2026)

Following the ruling, the Belastingdienst was required to rectify overpayments for taxpayers who had objected to their Box 3 assessments in the years 2017–2021. If you were living in the Netherlands during those years, had significant Box 3 assets, and lodged a formal objection (bezwaar) to your tax assessment, you are likely eligible for a refund.

Even if you did not object, the government later extended some recovery to a broader group following further court pressure. If you were resident in the Netherlands from 2017 onward with Box 3 assets, it is worth discussing your specific years with a tax advisor to see if any recovery applies.

The Temporary System (2023–2026)

While working toward a full reform, the government introduced a modified deemed return system that uses actual average market returns for each asset category (savings, investments) rather than flat fixed percentages. This is why the 2026 rates — 1.28% for savings (provisional), 6.00% for investments — are notably different from each other and change each year. They reflect what the average Dutch saver or investor actually earned in the relevant period.

This is still a deemed return system — it is not your actual return, it is the average. If you had a terrible year in the market and your investments dropped, you still pay tax based on the 6.00% deemed return. If your savings account offered an unusually high rate, you still only pay on 1.28%.

The Actual Return System (Werkelijk Rendement): Not Yet Law

The bill Wet werkelijk rendement box 3 would replace the deemed return system with taxation of actual returns, with a target start of 1 January 2028. Under the bill as adopted by the Tweede Kamer:

• Investment gains, dividends, and interest would be taxed as actually earned
• Value changes would be taxed each year as they accrue (vermogensaanwas), with an exception for real estate and certain start-up shares, which would be taxed on realisation (vermogenswinst)
• Rental income from Box 3 properties would be taxed on actual rent received

Status on 24 September 2026, per the Eerste Kamer bill page (36.748): the Tweede Kamer adopted the bill on 12 February 2026; on 30 June 2026 the Eerste Kamer postponed its vote until an announced amendment (novelle) is debated; and on 14 September 2026 the Minister and State Secretary of Finance wrote that they cannot yet present broadly supported changes and asked the Eerste Kamer to keep the bill on hold. So nothing has been adopted, and 2028 is a target, not a certainty. The move to actual return taxation will significantly change Box 3 planning strategies — particularly for expats with property in Box 3 or portfolios with high unrealised gains. I will update this guide as the legislation progresses.

Legal Strategies to Reduce Box 3 Tax

1. Use the Partial Non-Resident Election — Only If You Are Still Eligible

This used to be point one, two and three for anyone with the 30% ruling. It is not any more: the election was abolished per 1 January 2025. It is only still worth checking if you were already using the ruling before 2024, because that transitional group can elect it up to and including the 2026 return. If that is you, check your previous returns and make sure the election was actually made — and plan for Box 3 to apply in full from the 2027 return. If your ruling started in 2024 or later, skip this and go to the strategies below.

2. Invest in Green Funds (Groene Beleggingen)

The Dutch government maintains a list of approved green investment funds that invest in projects like sustainable energy, nature conservation, and organic agriculture. In 2026, investments in these funds up to €26,715 per person (€53,430 for fiscal partners) are exempt from Box 3, and you receive an extra tax credit of 0.1% of the exempt amount (Belastingdienst, checked 24 September 2026).

Green funds typically have lower returns than mainstream equity indices, so the trade-off must be considered. But for expats with Box 3 exposure and an interest in sustainable investing, they can form a tax-efficient part of a portfolio.

3. Time Major Purchases Before January 1

The peildatum is January 1. If you plan to make a significant purchase — a car, a home renovation, a holiday — doing it in December rather than January means that money no longer appears as an asset on the measurement date. This is completely legal: you are simply making a purchase you were going to make anyway, earlier rather than later.

This works best when you are close to the threshold or when a large purchase would meaningfully reduce your taxable wealth. It does not help if you are far above the threshold with substantial assets.

4. Contribute to Banksparen or Lijfrente

If you are self-employed or if you have identified a pension gap (your future pension income will be lower than your current income), Dutch banksparen and lijfrente products allow you to save for retirement in a tax-efficient wrapper:

• Contributions are deductible from Box 1 income (reducing your income tax now)
• The accumulated balance is excluded from Box 3 (reducing your wealth tax)
• The money is taxed at Box 1 rates when you draw it as pension income, but typically at a lower marginal rate than during your working years

This is particularly useful for ZZP/freelancers who do not have employer pension accrual. For more on pension options, see the Dutch pension guide for expats.

5. Optimise Your Fiscal Partnership Split

If you file as fiscal partners, you can split Box 3 wealth in any proportion. The optimal split depends on whether one partner has higher-yielding assets than the other. Running through a few scenarios before filing can sometimes reduce the combined household tax. This is worth a half-hour with a tax advisor or a spreadsheet.

6. Claim Deductible Debts

Debts above a threshold reduce your Box 3 wealth. Consumer loans, student loans, and other qualifying debts are subtracted at their January 1 balance. Note: your mortgage on your primary home is entirely a Box 1 matter — it does not reduce Box 3.

7. Move Savings to Pension Products Before Year End

If you have excess savings and are approaching retirement age (or have a pension gap), converting savings into banksparen contributions before December 31 removes them from Box 3 and gives you a Box 1 deduction in the same year. Two benefits at once.

What Does Not Count as Box 3 Debt Reduction

For completeness: your Dutch mortgage is handled exclusively in Box 1 through the hypotheekrenteaftrek (mortgage interest deduction) and eigenwoningschuld rules. Do not attempt to subtract your mortgage from Box 3. It does not work that way and will result in a correction assessment if the Belastingdienst reviews your return.

How to File Box 3 on Your Dutch Tax Return

Box 3 assets and liabilities are reported in Section 8 (Vermogen / Savings and Investments) of the Dutch tax return (aangifte inkomstenbelasting).

The process:

1. Log in to Mijn Belastingdienst using your DigiD
2. Open your aangifte for the relevant year
3. Handle to Section 8 — Inkomen uit sparen en beleggen (Box 3)
4. Enter each asset category at its January 1 value in euros
5. Enter any qualifying debts
6. If you are in the transitional group still entitled to partial non-resident status (30% ruling in use before 2024, 2026 return at the latest), indicate this in the relevant section — typically Section 1 of the return, regarding residency status for Box 2/3. Everyone else declares worldwide assets here.
7. The system calculates the tax automatically

Converting foreign assets to euros: Foreign accounts must be converted at the EUR exchange rate on January 1. For example, for a UK GBP account, use the GBP/EUR rate on January 1, 2026. Major financial data providers publish these rates. Your bank or broker may also provide a year-end or year-start statement in euros if you request it.

If you use Wise to hold foreign currencies or make international transfers, the Wise account history gives you precise balance statements by date — useful for pulling the exact January 1 figure for reporting purposes. This is particularly handy if you hold multiple currencies.

For help filing a Dutch tax return from scratch, the Dutch tax return guide covers the full process step by step.

Box 3 and the Broader Financial Picture

Box 3 does not exist in isolation. It connects to other areas of your Dutch financial life:

• Cost of living planning: Understanding Box 3 affects how you think about keeping large cash reserves. See the cost of living Netherlands guide for context on what savings levels are typical for expats.
• Salary and savings rate: Whether you are building Box 3 exposure quickly depends on your income. The average salary Netherlands guide gives context on typical income levels and savings potential.
• Savings and investment strategy: Our guide to the best savings accounts in the Netherlands covers account types and interest rates in more detail.
• Sending money internationally: If you have assets split across countries, keeping track of currency values is part of Box 3 management. Wise is a practical tool for this — see the Wise review for expats for a detailed breakdown of its features and fees.
• ETF investing in the Netherlands: For expats who want to invest within the Netherlands rather than keeping savings parked, see our guide to the best ETF platforms.
• Tax calculators and tools: Our expat tools section includes calculators that can help with Box 3 and overall tax planning.

Practical Quick-Reference: Box 3 by Situation

Frequently Asked Questions

How much tax do I pay on €100,000 in Dutch savings?

In 2026, the tax-free threshold is €59,357 per person. On €100,000 savings, your taxable wealth is €40,643. Applying the provisional 2026 deemed savings return of 1.28% gives a deemed return of €520. At the 36% tax rate, you owe approximately €187 in Box 3 tax. The amount is modest for savings-heavy portfolios because the savings deemed return (1.28%) is much lower than the investment deemed return (6.00%).

Is crypto taxed in Box 3?

Yes. Since 2023 the Belastingdienst has been explicit: Bitcoin, Ethereum and all other crypto-assets are Box 3 assets. You report the market value of your holdings on January 1 of the tax year. The 2026 investment deemed return of 6.00% is applied, and tax is charged at 36% on that deemed return. Major exchanges now share data with Dutch tax authorities under EU agreements, so non-reporting carries real risk.

Does the 30% ruling exempt me from Box 3?

No, not any more. The partial non-resident taxpayer status that used to exclude foreign assets from Box 3 was abolished with effect from 1 January 2025. The Belastingdienst is explicit — as of your 2025 tax return you can no longer opt for partial foreign tax liability. One transitional group remains — if you were already using the 30% ruling before 2024, you may still elect the status up to and including your 2026 return (filed in spring 2027), after which it is gone for everyone. If your ruling started in 2024 or later, the status was never available to you and your worldwide savings and investments fall in Box 3 like any other resident’s, taxed at 36% in 2026.

What is the peildatum and why does January 1 matter?

The peildatum (reference date) is January 1 of each tax year. Box 3 tax is calculated based on your wealth on that single date — not an average, not year-end. This creates a legitimate planning opportunity: large purchases made before January 1 reduce your measured wealth. If you were going to buy a car in January, buying it in December instead keeps that cash out of your Box 3 assessment.

How can I legally reduce my Box 3 tax?

The most effective strategies: (1) Invest in green funds — up to €26,715 per person (2026) is exempt from Box 3. (2) Time large purchases before January 1 to reduce measured wealth. (3) Contribute to banksparen or lijfrente pension vehicles — amounts held there are excluded from Box 3. (4) Use fiscal partnership to double the threshold to €118,714 and split assets optimally. Note that the partial non-resident election for 30% ruling holders is no longer on this list: it was abolished per 1 January 2025, and only expats who were already using the ruling before 2024 can still elect it, up to and including the 2026 return.

How do couples split Box 3 assets?

Fiscal partners (married, registered partnership, or cohabiting partners meeting the criteria) can split their combined Box 3 wealth in any proportion between them — from 0/100 to 100/0. Each partner gets the €59,357 threshold. The most tax-efficient split depends on whether the partners have different asset mixes. You decide the split annually when filing. A 50/50 split is common, but it is worth calculating the optimal allocation.

When will the Box 3 reform take effect?

Not before 2028, and it is not law yet. The Wet werkelijk rendement box 3 was adopted by the Tweede Kamer on 12 February 2026 with a target start of 1 January 2028, but the Eerste Kamer postponed its vote on 30 June 2026 pending an announced amendment (novelle). On 14 September 2026 the government asked the Eerste Kamer to keep the bill on hold while it works on broadly supported changes. Until a new system is adopted, Box 3 uses deemed returns, for 2026 1.28% on savings (provisional) and 6.00% on investments.

Is foreign property included in Box 3?

Generally yes — if you own a property abroad, its value goes into Box 3 on January 1. The main exception is a tax treaty — if the treaty between the Netherlands and the country where the property is located allocates taxing rights to that country, the Netherlands may exempt the property (though it can still affect the rate via the progression reservation). The old second exception — electing partial non-resident status under the 30% ruling — was abolished per 1 January 2025 and now only applies to expats who were already using the ruling before 2024, and only up to their 2026 return.

Conclusion

Box 3 is genuinely one of the more unusual tax mechanisms you will encounter as an expat in the Netherlands. Paying tax on deemed returns rather than actual earnings feels counterintuitive, particularly in years when the market is down or when your savings account is not earning much.

The numbers to keep in mind for 2026: €59,357 threshold per person, 1.28% deemed return on savings (provisional), 6.00% deemed return on investments, and 36% tax rate on those deemed returns. Run those through a quick calculation with your own figures and you will know roughly what you owe before you even open the Belastingdienst portal.

For expats with the 30% ruling: do not plan around the partial non-resident election unless you were already using the ruling before 2024. It was abolished per 1 January 2025, and even the transitional group has only the 2026 return left. If you are in that group, check your previous returns and make sure the election was made. For everyone else — which now includes every recent arrival — green funds, pension contributions, the fiscal partnership split, and the peildatum timing effect are your main tools.

Box 3 reform is not law yet. The 2026 system is still deemed-return based, and the actual-return bill aims at 2028 at the earliest while it sits on hold in the Eerste Kamer. If and when it is adopted, the planning picture will change significantly. I will update this guide when that happens.

In the meantime, if your Box 3 situation is complex — significant foreign assets, property in multiple countries, or large investment portfolios — a session with a Dutch expat tax advisor is worth the fee. The best tax advisors for expats guide has a shortlist if you need one.

Open a Wise account to manage foreign currency balances and get precise January 1 snapshots for tax reporting →