Reynders Tax: 30% on Bond ETF Gains Belgium [2026]

📅 Last updated: 8 May 2026
 ·  🏷 Topic: ETF taxation, bonds, capital gains
 ·  🇧🇪 For: English-speaking residents in Belgium

The Reynders tax is one of Belgium’s most misunderstood investment taxes. It’s a 30% withholding tax on the “Taxable Income per Share” (TIS) of the bond component of a fund or ETF, triggered when you sell. The TIS includes both the interest income and any capital gains attributable to debt instruments in the underlying portfolio — not interest only. Named after former Finance Minister Didier Reynders, the tax was designed to tax bond returns more heavily than equity returns. The 2026 reform did not narrow Reynders’ scope (Article 19bis CIR92 is unchanged). What changed is the treatment of the residual gain above the TIS: that portion now falls under the new 10% capital gains tax. This article walks through how Reynders works, who pays it, and how to navigate it.

What is the Reynders tax?

The Reynders tax is codified in Article 19bis of the Belgian Income Tax Code (WIB92 / CIR92). It applies a flat 30% withholding tax on the TIS of the bond component of a fund or ETF at the moment of sale.

The key word here is TIS. This is not just interest income—it includes both interest payments AND capital gains from the underlying debt instruments in the fund. This is the #1 misconception: many investors think Reynders only applies to dividends or interest coupons. In reality, if a bond fund holds bonds that have appreciated in value, that appreciation is captured in the TIS calculation and subject to the 30% rate.

How TIS is calculated

Fund managers publish TIS figures periodically (often daily or monthly). The TIS represents the income earned by the bond portion of the fund, split between:

• Interest received from coupons
• Capital gains (or losses) from bonds held within the fund

When you sell your fund shares, the tax authorities calculate the gain attributable to the bond portion using the TIS between your purchase and sale dates. That calculated amount is subject to the 30% Reynders tax.

Who pays the Reynders tax?

Reynders applies to:

• Bond ETFs (funds with significant bond holdings)
• Mixed equity-bond ETFs (the bond portion is taxable; the equity portion is not)
• Bond mutual funds (same principle as ETFs)

Reynders does NOT apply to:

• Pure equity ETFs (no bonds = no Reynders)
• Individual bonds held to maturity (though 2026 introduces a separate 10% CGT on secondary market sales—see below)
• Cash accounts and savings products

The thresholds: when does Reynders trigger?

There are two date-based thresholds depending on when you bought your fund shares.

For shares bought from 1 January 2018 onwards

If your fund holds 10% or more in debt instruments, Reynders applies to the bond portion.

For shares bought before 1 January 2018

The older, more generous rule applies: Reynders triggers only if the fund holds 25% or more in debt instruments.

Practical example:

• You buy 100 shares of a mixed ETF on 15 March 2020. The ETF holds 12% bonds and 88% stocks.
• Since 12% ≥ 10% (post-2018 rule), Reynders will apply to the bond portion when you sell.
• If you bought the same shares on 10 December 2015, the 25% threshold would apply instead—and since 12% < 25%, Reynders would not apply to those old shares at all.

This means if you hold multiple lots with different purchase dates, they’re taxed under different rules.

The 2026 split treatment: Reynders + the new capital gains tax

Starting 1 January 2026, Belgium introduced a new 10% capital gains tax on investment profits above €10,000 per year. This created a split treatment for bond funds and ETFs:

• Full TIS (the Article 19bis taxable base, covering both interest and bond capital gains attributable to the bond component) → 30% Reynders tax (Article 19bis CIR92, unchanged by the 2026 reform)
• Residual gain above the TIS (the part of the price appreciation that exceeds the TIS computation) → 10% new capital gains tax (loi du 3 avril 2026)

What does this mean in practice?

Let’s say you bought a bond ETF for €10,000 on 1 January 2020, and sell it for €12,500 on 1 January 2026. Your €2,500 gain is split as follows:

• €1,800 attributable to TIS (interest earned on bonds) → 30% withholding = €540 Reynders tax
• €700 residual capital appreciation → 10% CGT = €70 (if your total annual gains exceed €10,000)

This two-tier system makes bond fund taxation more transparent (you can now see exactly which portion is the interest vs. which is the price gain), but it also adds complexity at tax time.

Important: The scope of Reynders has not changed. The reform did not expand which bonds or funds trigger Reynders. It only changed how the gains are taxed once Reynders applies—splitting the 30% interest component from the 10% capital gains component.

How brokers handle Reynders: automatic withholding vs. self-reporting

Reynders handling varies dramatically depending on your broker.

Automatic withholding (most Belgian brokers)

Bolero, Keytrade, MeDirect, and Saxo handle Reynders automatically. When you sell a fund or ETF:

1. The broker calculates the TIS gain attributable to the bond portion.
2. The broker withholds 30% of that amount directly from your proceeds.
3. You see it on your trade confirmation and year-end tax summary.
4. No extra action required—the tax is already paid.

Self-reporting (DEGIRO and some international brokers)

DEGIRO is the major outlier. DEGIRO withholds the TOB (stock exchange transaction tax) automatically, but it does NOT automatically withhold Reynders. This means:

1. DEGIRO pays the full proceeds to your account (no Reynders withholding).
2. You must self-declare the Reynders tax on your annual Belgian tax return (personenbelasting / declaration of personal income, IPP).
3. You need a TIS certificate from the fund issuer to calculate the exact amount owed.
4. The tax is due when you file your return; failure to declare can result in penalties.

Trade Republic and Interactive Brokers (IBKR) also do not auto-withhold Reynders—Belgian users must self-report.

Critical for DEGIRO users: Many investors are unaware they owe Reynders tax because DEGIRO doesn’t automatically deduct it. Tax authorities expect you to declare it in Box VII (other income) of your tax return, along with a TIS attest from the fund manager.

Distributing ETFs and the (theoretical) exemption

Here’s another layer: if a distributing ETF fully distributes all its income to shareholders each year, it is theoretically exempt from Reynders. The logic is: if you’ve already been taxed on the distributions (30% withholding on each dividend), you shouldn’t be taxed again on the TIS at sale.

However, this exemption is almost never applicable in practice because:

1. Most ETFs—even distributing ones—do not distribute 100% of their income.
2. Fund statutes rarely commit to full distribution.
3. Even if they do, accumulated gains still trigger Reynders.

In reality, nearly all bond ETFs held by Belgian residents pay Reynders at sale, whether they are distributing or accumulating.

Individual bonds: Reynders does NOT apply (but 2026 CGT does)

If you own individual bonds (not an ETF), here’s the good news: Reynders does not apply.

Here’s the catch: 2026 capital gains tax applies to individual bonds, including at redemption. If you bought a bond below par on the secondary market (e.g., €95) and it is redeemed at par (€100), the €5 difference is a capital gain—and it’s subject to the 10% CGT (above the annual €10,000 exemption).

The only exception: if your purchase price equals the redemption price (you bought at par and it redeems at par, or both are the same), there is no taxable gain.

This is a significant change for secondary-market bond traders in 2026.

Practical mitigation strategies

1. Use pure equity ETFs

If you’re investing for long-term growth, a pure equity ETF (0% bonds) avoids Reynders entirely. You’ll only face the 10% capital gains tax on gains above €10,000/year, starting 2026. For many investors, this is simpler.

Examples: IWDA (iShares Core MSCI World), VWCE (Vanguard All-World), SWRD (State Street SPDR MSCI World).

2. Hold individual bonds to maturity

If you like bonds for stability, buying individual bonds and holding to maturity avoids Reynders. You’ll pay tax on interest (30% withholding, typically automatic), but no Reynders at redemption—as long as you bought at par and it redeems at par.

If you buy at a discount on the secondary market, be aware that 2026 CGT applies to the redemption gain.

3. Use life insurance wrappers (Tak21 / Tak23)

Tak21 contracts are guaranteed-rate Belgian life insurance products with no underlying bond fund — Reynders cannot apply because the triggering condition (selling a fund unit with a TIS calculation) never occurs. Tak21 is therefore not a Reynders-mitigation vehicle for investors who actually want bond-market exposure; it is a savings-insurance product with a contractually guaranteed rate.

Tak23 contracts are unit-linked Belgian life insurance products that wrap underlying funds (including bond funds). The wrapper structure means Reynders does not apply at the policyholder level. However, from 1 January 2026 Belgian Tak23 contracts trigger the new 10% capital gains tax upon surrender or buy-back of the contract — not via look-through transparency on the underlying funds. Importantly, for contracts held before 1 January 2026 the acquisition value is stepped up to the higher of inventory reserve or total premiums paid as of 31 December 2025, shielding pre-2026 accumulated gains. Tak23 is therefore no longer a pure tax shelter, only a Reynders-shelter for new contributions.

Both products are sold only by Belgian insurance companies, typically carry higher fees and less flexibility than ETFs, and have their own separate fiscal regimes (premium tax, anticipative withholding rules) — verify with a Belgian tax adviser before relying on them as a Reynders mitigation strategy.

4. Accept Reynders and factor it in

For investors who want bond allocation, Reynders is simply a cost of doing business. If you’re buying via Bolero, Keytrade, or Saxo, it’s handled automatically. If you’re on DEGIRO, mark your calendar to self-report it. The 30% + 10% combined tax is still reasonable for long-term bond holdings, especially compared to paying income tax rates on interest (which can be 45% or higher in Belgium).

Worked example: from purchase to tax bill

Scenario: You buy €10,000 of a bond ETF via Keytrade on 1 March 2020. You sell on 1 April 2026.

• Sale proceeds (before tax): €12,500
• Gain: €2,500
• TIS calculated from purchase to sale (per fund issuer): €1,900 attributable to bond interest and capital gains
• Residual capital appreciation: €600

Keytrade withholding at sale:

• Reynders (30% on TIS): €1,900 × 30% = €570
• Capital gains tax (10% on residual, if gains > €10k): €600 × 10% = €60 (or €0 if this is your only gain)

You receive: €12,500 − €570 − €60 = €11,870 (assumes your €10,000 annual CGT exemption is already exhausted by other realised gains; if this is your only realised gain of the year, CGT = €0 and you receive €11,930; before any brokerage fees)

Your tax return: You report the €570 and €60 as taxes already paid, reducing your overall tax liability for the year.

If you were on DEGIRO instead, you’d receive the full €12,500, but you’d owe the €570 and €60 when you file your return—and it’s your responsibility to calculate and declare it.

Key takeaways

• Reynders is 30% withholding on the TIS (bond income portion) of funds/ETFs at sale. TIS includes both interest and capital gains from bonds, not just interest.
• Two thresholds: 10% bond content (2018+) and 25% (pre-2018).
• 2026 split treatment: interest → 30% Reynders; residual gains → 10% CGT.
• Brokers vary: Bolero/Keytrade auto-withhold. DEGIRO does not—you self-report via your tax return.
• Pure equity ETFs avoid Reynders entirely.
• Individual bonds held to maturity avoid Reynders (but 2026 CGT applies to secondary-market sales at a gain).
• Distribute vs. accumulate: distribution status does not exempt you from Reynders in practice.

For more on Belgian investment taxation, see the Belgian investment taxation pillar. For ETF selection and strategy, see ETF investing in Belgium: a complete guide for beginners and portfolio construction and asset allocation in Belgium.

Sources

1. SPF Finances / FOD Financiën — Reynders tax (Article 19bis WIB92)
2. Wikifin — Investment taxation in Belgium
3. FSMA — Guidelines on investment funds and ETFs
4. Belgian Tax Administration — Capital gains tax 2026 implementation