Belgian OLO 2026 Guide — Yields, State Notes, 30% Tax, 10% CGT
Complete 2026 guide to Belgian OLO bonds and State Notes for EU investors. Yields 2.5-4.7% (Sep 2026), FDA auctions, 30% roerende voorheffing, the new 10% capital-gains tax, Sept 2026 State Note 2.75%/3.70%.
- 3.87%
- 10-year OLO yield, 31 Aug 2026 (Debt Agency curve; 30-year 4.68%)
- 2.75% / 3.70%
- Sept 2026 State Note coupons, 1-year / 10-year (1.925% / 2.59% net)
- 10%
- new Belgian capital-gains tax on bonds since 1 Jan 2026 (€10,000 exemption)
- AA- / A+ / A1
- S&P / Fitch / Moody's after the spring 2026 downgrades
Fact-checked against primary sources on · figures re-verified on regulator, issuer or SEC filings — not copied from other sites
TL;DR
Belgium issues two main families of sovereign debt: OLOs (Obligations Linéaires / Lineaire Obligaties — euro benchmark bonds with maturities from 1 to 50 years) and State Notes (Bons d'État / Staatsbons — retail-targeted bonds sold in limited subscription windows four times a year). Belgium's Federal Debt Agency (FDA, in French Agence Fédérale de la Dette, in Dutch Federaal Agentschap van de Schuld) runs both programmes on behalf of the Treasury. Yield ranges as of 2026 are approximately 2.55% on 1-year Treasury Certificates, 2.75% on 2-year OLOs, 3.05% on 10-year OLOs and 3.45% on 30-year OLOs — a spread of around 20-30 basis points over German Bunds. Belgian residents face the 30% roerende voorheffing / précompte mobilier on bond coupons, withheld at source. EU non-resident investors can typically obtain zero Belgian WHT via the X/N account system for non-residents (no DTT reclaim needed). The famous September State Notes have re-emerged as a retail-deposit alternative since the 2023 reform.
Why Belgian sovereigns matter in 2026
Belgium runs the fifth-largest Eurozone government bond market (federal debt EUR 575 billion at 31 July 2026). Credit ratings sit at AA- by S&P (24 April 2026), A+ by Fitch (22 May 2026) and A1 by Moody's (17 April 2026) — all three agencies cut Belgium a notch in spring 2026, leaving it two to three notches below core Eurozone but firmly higher than Spain or Italy. The fiscal picture is mixed: debt-to-GDP is around 105%, and political fragmentation has slowed deficit consolidation, but the Belgian sovereign trades remarkably tightly to Bunds thanks to deep domestic investor base and ECB backstop.
For an EU fixed-income allocator, OLOs are the "second-tier core" — slightly more yield than Bunds and DSLs, similar liquidity to French OAT. The 2023-24 State Notes drama (when Belgium's September 2023 retail issue raised EUR 22 billion in a single week, prompting all Belgian banks to scramble on deposit pricing) put Belgian sovereign debt on the radar of Belgian retail investors in a way unseen for decades.
Bond types: OLO, State Notes, Treasury Certificates
The FDA programme has three retail-relevant wrappers.
Treasury Certificates (Certificats de Trésorerie / Schatkistcertificaten). Zero-coupon bills with maturities of 3, 6 and 12 months. Auctions every two weeks. Minimum denomination EUR 1,000.
OLOs (Linear Bonds). Conventional fixed-rate coupon bonds with maturities from 1 to 50 years. The FDA prefers a small number of large benchmark lines, reopening them across multiple auctions to build liquidity. Annual coupons. Minimum denomination EUR 1,000.
State Notes (Bons d'État / Staatsbons). Retail-targeted bonds with subscription windows in March, June, September and December. Recent windows have offered only two maturities — 1 and 10 years (1 and 8 years in March 2026) — with coupons set just before each subscription window based on the prevailing OLO curve. The famous September 2023 1-year State Note offered 3.30% gross with a reduced 15% WHT (instead of the usual 30%), raising EUR 22 billion — equivalent to 5% of Belgian household savings — in one week. The 2025 reissuance series have returned to standard 30% WHT but the format remains popular for households who want a retail-friendly, no-broker-needed instrument. Minimum denomination EUR 100.
Inflation-linked variants exist as a tiny programme (OLO indexed to HICP) but stock is below EUR 5 billion and not retail-accessible.
How retail investors can buy
There are three routes.
State Notes — direct retail subscription. Belgian residents subscribe through a placing bank or directly, fee-free, via the Debt Agency's Grootboek / Grand-Livre online platform (which also accepts registrations from non-residents — check the current brochure). Subscription is open for 1-2 weeks before each quarterly window. Settlement is straightforward, the FDA handles all admin, and the bond is held in the investor's securities account. This is by far the most popular retail route in Belgium — the September 2023 issue had over 600,000 individual subscribers.
OLO — secondary market. Once issued, OLOs trade on Euronext Brussels and the OTC interdealer market. Belgian banks (Belfius, KBC, BNP Paribas Fortis, ING Belgium) all offer OLO trading on their investment platforms, with fees ranging from EUR 15-40 per trade plus custody. The discount route is via DEGIRO, IBKR or Saxo Bank Belgium.
EU-domiciled brokers. DEGIRO offers OLO on its bond marketplace at EUR 2 + 0.04% per trade. IBKR provides full OLO access via SMART routing. Trade Republic added selected Belgian sovereigns during its 2024 bond expansion.
Treasury Certificates are wholesale-only in practice — retail can technically subscribe but minimum lot sizes at auction make it impractical; secondary market access is via brokers.
Yield curve as of 2026
Belgian Debt Agency constant-maturity curve of 31 August 2026 (Bund: Trading Economics, 1 September 2026).
| Maturity | OLO yield | Bund yield | Spread vs Bund |
|---|---|---|---|
| 3 month (TC) | 2.49% | 2.40% | +9 bps |
| 6 month (TC) | 2.65% | — | — |
| 1 year | 2.83% (TC 12m 2.86%) | — | — |
| 2 year | 2.94% | 2.93% | +1 bp |
| 5 year | 3.33% | 3.06% | +27 bps |
| 10 year | 3.87% | 3.34% | +53 bps |
| 30 year | 4.68% | 3.83% | +85 bps |
Latest primary prints: OLO auction of 24 August 2026 — OLO108 3.10% 08/2031 at 3.260%, OLO106 3.40% 06/2036 at 3.805%, OLO71 3.75% 06/2045 at 4.389% (€3.58bn, cover 2.00); Treasury Certificates of 1 September 2026 — 3-month 2.492%, 6-month 2.653%, 12-month 2.860% (Belgian Debt Agency).
Belgian OLO curve sits in the "second tier" of Eurozone sovereigns — now pricing tighter than France (OAT 4.21%) and slightly wider than Spain (3.80%) at the 10-year. The 2s10s slope has steepened to about +90 bps.
Spread versus German Bunds
Drivers of the OLO-Bund spread as of 2026:
- Credit ratings. AA-/A+/A1 versus Germany's AAA — a two-to-three-notch differential after the spring 2026 downgrades.
- Debt-to-GDP. Belgium at 105% versus Germany at 64%. Higher leverage but stable trajectory.
- Political fragmentation. Belgian government formation can take 12+ months (2024-25 set a new record); periodic deadlock risk drives episodic spread widening.
- Domestic investor base. Belgian banks and insurers hold a meaningful share of OLO supply, providing structural demand and compressing spreads.
- ECB transmission tools. TPI and PEPP reinvestment apply equally to Belgian as to peripheral sovereigns.
The 10-year spread has widened from roughly 30 bps in 2025 to 53 bps by September 2026 as the rating downgrades landed.
Tax treatment for Belgian residents — the 30% précompte
Belgium's roerende voorheffing / précompte mobilier (RV/PM) is one of the most aggressive bond income taxes in Europe at a flat 30%. It applies to:
- Coupons on Belgian sovereign bonds (OLOs, State Notes)
- Coupons on foreign bonds held by Belgian residents
- Capital gains on "Reynders tax" eligible bond funds (10%-equivalent flat rate, see Loi Reynders / TIS)
The 30% WHT is deducted at source by the paying agent (the Belgian custodian bank or broker). For Belgian-resident retail investors holding OLOs through a Belgian bank, the tax is automatic — no annual filing is needed for the bond coupon income (it is libératoire). State Notes pay coupons net of 30% directly.
Capital gains on individual bonds held by Belgian residents are now subject to the 10% tax on capital gains from financial assets introduced on 1 January 2026 (with a €10,000 annual exemption; withholding by Belgian intermediaries from 1 June 2026). Capital gains on bond funds remain subject to the Loi Reynders 30% flat rate on the interest-equivalent portion of the gain.
There is no Belgian retirement-account wrapper directly comparable to French PEA or UK ISA for sovereign bonds. The Pension Savings Funds (Fonds d'Épargne Pension / Pensioenspaarfondsen) hold mostly equities and corporate bonds, not sovereigns directly.
Savings in one bank, investments in another? See it all in one place — and how many months it could carry you.
See your Freedom Runway — freeThe 2023 State Note phenomenon
In September 2023, the Belgian government offered a one-year State Note with a 3.30% gross coupon and a temporarily reduced 15% WHT — explicitly designed to pressure Belgian banks into raising deposit rates. The result was historic: EUR 21.9 billion raised in eight days from 615,000 subscribers, equivalent to about EUR 35,000 per participant on average. Belgian banks were forced to raise term-deposit pricing materially over the following months.
The 2024-25 State Note issues returned to the standard 30% WHT (the 15% incentive was a one-off political tool) and subscriptions normalised — EUR 1.0 billion for the whole of 2025 (March 140m, June 132m, September 441m, December 300m) and EUR 263m in March 2026 — but the State Note format is now established as a credible retail savings alternative.
As of 2026 the September quarter is again being watched closely for any repeat tactical use of reduced WHT — depending on tax residency, this can shift the math meaningfully.
Tax treatment for foreign EU investors — the X/N account
Belgium operates a unique dual-account system for bond custody:
- N accounts (nominal / nominatif). Used by Belgian-resident individuals subject to the 30% précompte. Tax is automatically withheld.
- X accounts (exempt / exonéré). Used by non-residents, qualifying institutional investors, and tax-exempt entities. No Belgian WHT is applied at source.
For EU-resident individual investors holding OLOs through a non-Belgian broker (DEGIRO, IBKR, Trade Republic), the holding is typically routed through an X account — meaning zero Belgian WHT on coupons. The investor receives gross coupons and pays only their home-country tax.
If for some reason a non-resident holds OLOs through a Belgian custodian and 30% has been withheld, reclaim is possible via Form 276 INT to the Belgian Federal Public Service Finance, but the process is slow (6-18 months) and many investors simply avoid the situation by using a non-Belgian broker.
For non-EU residents (UK, Switzerland) the X account regime still applies — Belgium's WHT exemption is residency-based, not EU-status-based.
Brokers offering access
| Broker | OLO access | State Notes | Fees | FX |
|---|---|---|---|---|
| Belfius | Full | Yes | EUR 15-30 + custody | EUR native |
| KBC | Full | Yes | EUR 20-40 + custody | EUR native |
| BNP Paribas Fortis | Full | Yes | EUR 20-40 + custody | EUR native |
| ING Belgium | Full | Yes | Variable | EUR native |
| DEGIRO | Liquid issues | No | EUR 2 + 0.04% per trade | EUR native |
| IBKR | Full via SMART | No | Low (per-trade) | EUR native |
| Trade Republic | Selected | No | EUR 1 external fee | EUR native |
| Saxo Bank BE | Full | No | Competitive for size | EUR native |
| BNB Securities | OLO + State Notes | Yes | Low custody | EUR native |
Belgian residents wanting State Notes have only the bank/BNB Securities route. For OLO secondary trading, DEGIRO or IBKR are the cheapest options.
Inflation-linked variants
Belgium has issued euro HICP-linked OLOs occasionally since 2015 but the programme has never reached benchmark scale. Stock is around EUR 4-5 billion, with limited secondary liquidity. Real yields trade in line with French OATei and Italian BTPei adjusted for the OLO credit spread (currently ~+1.2% real on long maturities).
Most EU investors seeking euro inflation protection use French or German linker ETFs (e.g. iShares EUR Inflation Linked Govt Bond UCITS) rather than direct Belgian linkers — liquidity and clip sizes favour the diversified wrapper.
Worked example — EUR 10,000 in 10-year OLO
Assumptions: EUR 10,000 invested in benchmark 10-year OLO at 3.05% YTM, held to maturity.
Belgian-resident investor (N account):
- Annual gross coupon: EUR 305
- 30% précompte withheld: EUR 91.50
- Annual net cash: EUR 213.50
- Net YTM over 10 years: ~2.14%
EU non-resident investor (X account, e.g. German resident):
- Annual gross coupon: EUR 305
- Belgian WHT: 0
- Annual gross cash: EUR 305
- German tax at 26.375% (Abgeltungsteuer + Soli): ~EUR 80.45
- Net cash: ~EUR 224.55
- Net YTM ~2.25%
Compared to Belgian high-yield deposit accounts (which, post-2023 State Note pressure, now offer 2.0-2.5% gross), the 10-year OLO offers around 50-100 bps of extra yield in exchange for duration risk and tax bite.
| Vehicle | Gross yield | Net yield (BE 30% WHT) | Net yield (DE Abgeltungsteuer) |
|---|---|---|---|
| 10-yr OLO | 3.87% | 2.71% | 2.85% |
| 10-yr State Note (Sept 2026) | 3.70% | 2.59% | 2.73% |
| 1-yr State Note (Sept 2026) | 2.75% | 1.925% | 2.03% |
| Top Belgian regulated savings (lump sum) | 2.20% | 2.20% (inside €1,020 exemption) | 2.20% |
Polish reader angle
For a Polish-resident investor: Belgian OLOs held via DEGIRO or IBKR (X account route) deliver gross coupons of 3.05% on the 10-year. Polish Belka tax of 19% applies, leaving ~2.47% net — slightly above DSL (~2.39%) and below Polish EDO retail bonds (~6.05% year-one in PLN).
Polish-Belgium DTT (signed 2001) caps Belgian-source bond WHT at 10%, but as the X account route already delivers zero Belgian WHT, the DTT is academic for most Polish investors. Polish residents declare Belgian bond income on PIT-38 at the 19% Belka rate.
OLOs are theoretically eligible for IKE/IKZE wrappers if your Polish provider offers foreign bond purchases — most do not, so a standard maklerski account is the typical route. State Notes can be subscribed through the Debt Agency's Grootboek platform, which also registers non-residents — but the practical route for non-Belgians remains OLOs through a broker.
Common gotchas
- N versus X account routing. If your bond is mis-tagged as N, you may suffer 30% Belgian WHT in error — verify with your custodian.
- State Notes are not OLOs. State Notes are a separate format with subscription windows, smaller minimum denominations and retail-friendly mechanics — they are not freely tradable on the secondary market.
- Political risk repricing. Spread to Bunds can widen 20-40 bps during prolonged Belgian government-formation deadlock — historically a feature, not a bug.
- Annual coupon convention. OLOs pay annually; first coupon date is fixed at issue and propagates with each reopening.
- Belgian language requirements. State Note documentation is in French/Dutch/German — English summaries are limited. Use a Belgian-resident proxy if needed.
- Belgian wealth taxes. Belgium imposes a 0.30% annual "securities account tax" (Taxe sur les comptes-titres / Effectentaks, law of 17 February 2021) on securities accounts above EUR 1 million — affects high-net-worth holdings.
FAQ
Q1: Are State Notes better than OLOs for retail? For Belgian residents wanting simplicity and no broker, yes — State Notes have lower minimum denominations (EUR 100), simpler subscription, and bank-handled custody. Yield is typically 10-20 bps below the equivalent OLO maturity (the FDA prices State Notes at a small discount to reflect the retail simplicity). For non-Belgian investors, OLOs are the only practical route.
Q2: What does the September 2026 State Note pay? The September 2026 issue (subscription 26 August – 3 September 2026 at banks, to 2 September on the Grootboek platform; issue date 4 September) offers a 1-year note at 2.75% gross (1.925% net of 30% WHT, ISIN BE3871314444) and a 10-year note at 3.70% gross (2.59% net, ISIN BE3871315458), in €100 multiples. The withholding tax is the standard 30% — the 15% of September 2023 was a one-off.
Q3: Does Belgium tax capital gains on individual OLOs? Since 1 January 2026, yes: Belgium taxes capital gains on financial assets — individual bonds included — at 10%, with a €10,000 annual exemption (indexed) and withholding by Belgian banks and brokers from 1 June 2026. Bond funds remain under the Loi Reynders 30% regime on the interest component.
Q4: How does the X account regime work for non-resident funds? Investment funds, pension funds and other qualifying institutional investors automatically get X account routing. Individual non-residents need broker confirmation; major EU brokers (IBKR, DEGIRO) handle this routing automatically.
Q5: What is the smallest OLO clip size at retail? EUR 1,000 face value. Some brokers allow fractional purchases for smaller amounts via internal pooling.
Q6: Are Belgian linker bonds available on Trade Republic? Generally no — Trade Republic's Belgian sovereign offering is limited to nominal OLOs in benchmark issues. Inflation-linked exposure is via ETFs (e.g. IBCI, IUS5).
How can an EU non-resident buy Belgian OLOs without paying the 30% précompte?
The practical route is to hold OLOs through a non-Belgian broker (such as a pan-European discount broker) so the position is routed through Belgium's X account regime for non-residents, which applies zero Belgian withholding at source. If a Belgian custodian is used and 30% is withheld in error, reclaim is theoretically possible via Form 276 INT but can take many months. Non-residents should verify with their broker that the holding is tagged as exempt and confirm their home-country tax treaty rules.
What is the minimum investment for Belgian State Notes versus OLOs?
Based on historical data, State Notes (Bons d'État / Staatsbons) carry a low retail minimum denomination of around EUR 100, while OLOs and Treasury Certificates have a EUR 1,000 minimum face value. Some brokers allow fractional OLO purchases via internal pooling for smaller tickets. Worth checking current subscription terms, as these are set per issue by the Federal Debt Agency.
How do Belgian OLO yields compare to German Bunds as of early 2026?
As of 1 September 2026, 10-year OLO yields are 3.87% against 3.34% on the equivalent Bund, a spread of about 53 basis points, widening toward 85 basis points at the 30-year point. The gap mainly reflects Belgium's AA-/A+/A1 ratings and itsAA- rating versus Germany's AAA and higher debt-to-GDP, partly offset by a deep domestic investor base. Spreads can widen 20-40 basis points during prolonged Belgian government-formation deadlock, so it is worth checking current rates.
Are Belgian capital gains on individual OLOs taxed for residents?
For Belgian residents, capital gains on individual sovereign bonds are taxed at 10% since 1 January 2026 (after a €10,000 annual exemption) — before 2026 they were generally untaxed unless deemed speculative. Gains on bond funds, by contrast, fall under the Loi Reynders / TIS rules at a 30%-equivalent flat rate on the interest portion. Tax rules can change, so residents should verify the current treatment for their situation.
Tracking your Belgian bond ladder with Freenance
A Belgian sovereign ladder typically combines March/June/September/December State Note vintages with secondary-market OLO positions across the curve. Freenance lets you tag each position with its ISIN, coupon date, maturity, and the relevant tax flag (N vs X account, home-country WHT) so the projected cash flow shows what actually lands in your account. The Financial Freedom Runway metric uses those net cash flows to show how many months of expenses your portfolio income covers — a particularly useful framing in Belgium where the 30% précompte materially affects after-tax planning.
Informational content, not investment advice. Bond yields move daily; check current data before trading. Tax rules and rates summarised here may change. Consult a qualified adviser for your residency situation.
Sources: Belgian Federal Debt Agency (FDA / Agence Fédérale de la Dette / Federaal Agentschap van de Schuld), Service Public Fédéral Finances (RV/PM rules), National Bank of Belgium (BNB Securities portal), S&P / Fitch / Moody's (sovereign ratings), Euronext Brussels (secondary market data).