Corporate vs Government Bonds in Belgium (Compared)

📅 Last updated: 8 May 2026
 ·  🏷 Topic: Corporate bonds, government bonds, credit quality
 ·  🇧🇪 For: Belgian bond investors

In the fixed-income universe there are broadly two categories: government bonds (issued by governments) and corporate bonds (issued by companies). Different risk-return profiles, different roles in a portfolio.

Main differences

Belgian government bonds (OLO)

OLO = Linear Bond issued by the Belgian Treasury. For retail investors, state notes (staatsbons) are also available at specific issuances. See Buying a state note(NL).

Characteristics:
– Belgian state = AA rating (S&P)
– Coupon usually fixed for the term
– Two-sided liquid market for secondary trading

Coupon examples (May 2026, indicative):
– 1-year OLO: ~3.2%
– 5-year OLO: ~3.5%
– 10-year OLO: ~4.0%

Corporate bonds

Companies issue bonds to raise capital. Rating agencies (S&P, Moody’s, Fitch) assess credit quality:

Example (May 2026, indicative):
– 5-year KBC corporate bond (A rating): ~4.2-4.5%
– 5-year Belgian government bond: ~3.5%
– Spread: ~0.7-1%

The credit risk: a company can go bankrupt. In that case, bondholders come first (before shareholders) but typically only get a fraction of the principal back.

High yield (“junk”) bonds

Corporate bonds with a rating of BB or lower — speculative. Much higher yield, but also much higher default risk.

Important nuance: in stress periods (e.g. 2020 COVID, 2022 rate rise) high-yield bonds correlate more strongly with equities than with government bonds. The diversification value disappears precisely when you need it most.

For a “truly defensive” portion of the portfolio → government bonds or high-grade investment grade.

Belgian taxation on bonds

On coupon (interest):
– 30% withholding tax automatically deducted by Belgian broker.
– With a foreign broker → declare yourself in personal income tax (box VII, 1444/2444).

On capital gains (since 2026):
– 10% new capital gains tax above the €10,000 annual exemption.
– For bonds this is generally relevant on sale before maturity, or via a bond ETF.

On bond ETFs (accumulating):
– 30% Reynders tax on the interest component upon sale.
– + 10% capital gains tax on actual price appreciation.

See Reynders tax explained and Belgian investment taxes(NL).

Practical allocation

For the defensive component of your portfolio (10-40% depending on age):

Option A — Belgian OLO/state note:
– Highest safety.
– Coupon taxed at 30% withholding tax.
– For those with specific 1-10 year money goals.

Option B — Bond ETF (diversified):
– iShares Core Global Aggregate Bond UCITS (AGGH) — globally diversified, government + corporate.
– Or iShares Euro Government Bond UCITS (EUNB) — euro government bonds only.
– Reynders tax applies → fiscally more complex.

Option C — Mix of OLO + corporate bonds via separate ETFs:
– 60% government bonds + 40% investment grade corporate bonds.
– Maximum 5-10% in high yield (if desired, not necessary).

Important difference from equities

Bonds have a maturity date: with hold-to-maturity you get the principal back. Bond ETFs have no maturity date — they roll continuously, so the concept of “waiting until maturity” does not work with bond ETFs.

For those with specific money goals with a fixed date (e.g. child’s studies in 5 years): an individual bond + hold-to-maturity is predictable.

For general defensive allocation: a bond ETF is simpler.

🔗 See Bonds and fixed income(NL) for the pillar version.

The spread you are comparing is a pre-tax spread

Credit risk and yield spread are the right frame, but for a Belgian holder the comparison changes once tax is applied — and it applies differently depending on how you hold the bonds.

• Through a bond fund or ETF: any fund with 10% or more bond exposure is caught by the Reynders tax (art. 19bis WIB92/CIR92), which levies 30% on the TIS component at sale — the interest component and debt-related gains. For a bond fund that is essentially the whole return.
• Holding individual bonds directly: the coupon is movable income, taxed at 30% withholding tax. There is no Reynders charge, because there is no fund.

So a corporate-versus-government decision made on a gross spread of, say, 150 basis points is comparing something the investor never receives. After a 30% levy that spread narrows materially — and the additional credit risk taken to earn it does not narrow at all.

What this implies for the choice

1. Compare after-tax yields, not gross spreads. The extra risk of corporate credit has to be justified by what reaches you.
2. Decide the wrapper deliberately. Fund versus direct holding changes which levy applies, and the answer is not the same for every investor.
3. Remember stock-exchange tax on the fund route — 0.12% on purchase and again on sale, on top of the Reynders charge.
4. Government bonds held to maturity avoid the price risk that dominates short holding periods, but the coupon remains taxable either way.

Sources

1. Federal Treasury — OLO and state notes
2. S&P Global — Corporate ratings
3. iShares — Bond ETF factsheets

Read also: buying a Belgian staatsbon step by step

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