Best High-Yield Savings Accounts in Belgium 2026: Up to 4.0% Compared

Quick Answer

For Belgian residents in 2026, the highest sustainable savings yield comes from the regulated savings account regime: MeDirect Bank's promotional 4.0% combined rate (base + fidelity premium) and Aion Bank's 3.5% lead the pack, with Belfius, KBC, Argenta and ING Belgium clustering between 1.5% and 2.5% on their main regulated products. Trade Republic Belgium offers 3.25% on a flexible cash account but does not qualify as a Belgian regulated savings account, so interest is fully taxed at 30% mobiliarheffing rather than benefiting from the €1,020 per-taxpayer interest exemption in tax year 2026. Always read the rate label — Belgian regulated savings split into a "base rate" earned daily and a "fidelity premium" earned only on funds that stay deposited for 12 consecutive months. All listed providers fall under €100,000 deposit protection through the relevant home-country DGS.

Belgian Savings Landscape — At a Glance

Rates as of May 2026; promotional offers excluded except where flagged.

Methodology (May 2026)

We surveyed Belgian-resident savings accounts during April-May 2026 using each provider's published Information Document on Savings Deposit (IDDS), Febelfin's regulated-savings register, and FSMA conduct notices. We split each headline rate into the two components Belgian law requires banks to disclose separately (base rate / fidelity premium), and we modelled net post-tax yield for both a single filer and a joint couple under the 2026 €1,020 / €2,040 interest exemption. Promotional teaser rates are noted but the standard rate is the basis for ranking.

Authoritative sources used during the review:

• National Bank of Belgium and Garantiefonds rules: nbb.be
• SPF Finances précompte mobilier guidance: finances.belgium.be
• FSMA savings-account consumer notices: fsma.be

How Belgian Regulated Savings Work

A regulated savings account (spaarrekening / compte d'épargne réglementé) is a uniquely Belgian financial product governed by Royal Decree and offered by every NBB-licensed deposit institution. Three structural features distinguish it from a generic savings account elsewhere in Europe:

1. Two-component interest — a "base rate" credited daily on the balance, and a "fidelity premium" credited only on funds held continuously in the account for at least 12 months. The premium starts accruing the day funds are deposited, but is paid only after the 12-month anchor period; withdrawing earlier forfeits the premium on those funds.
2. Tax exemption on first €1,020 of interest per taxpayer — applies to combined regulated-savings interest across all institutions in tax year 2026. Couples filing jointly enjoy €2,040 combined.
3. Reduced 15% withholding above the cap instead of the standard 30% mobiliarheffing on non-regulated savings, dividends and bond coupons.

This means a saver with €30,000 in a Belgian regulated account at 3.5% generates roughly €1,050 of interest — almost entirely covered by the per-taxpayer exemption. The same balance at 3.25% in Trade Republic's non-regulated cash account generates €975 gross but only €682 net after 30% mobiliarheffing.

Per-Provider Mini Reviews

1. MeDirect Bank — Highest Belgian Regulated Rate (Promo)

MeDirect Bank operates a Belgian branch (FSMA-passported from Malta) and currently runs the most aggressive promotional combined rate in the regulated-savings market: 1.50% base + 2.50% fidelity premium = 4.00% on its Fidelity Account. The combined rate is well above peers, but two caveats apply: the promotional structure has historically been adjusted twice yearly, and the 2.50% premium is only earned by funds that remain on deposit for 12 consecutive months. Investors who plan to draw down within a year should focus on the base rate alone.

2. Aion Bank — Best All-Inclusive Premium Bundle

Aion Bank's 3.5% regulated savings yield is bundled into its All-Inclusive Premium subscription at €19.99/month. The rate splits as 2.00% base and 1.50% fidelity premium, which is unusually base-heavy by Belgian standards — useful for savers who hold balance for less than a year. Combined with Aion's unlimited Wise FX and ETF execution, the €19.99 ticket is competitive for savers above ~€15,000 balance who would otherwise pay separate FX and brokerage fees.

3. Trade Republic Belgium — Flexible But Not Regulated

Trade Republic offers 3.25% on uninvested cash up to €50,000, paid daily and accessible without notice. The product is not a Belgian regulated savings account — it is a German-licensed deposit subject to BaFin supervision and DGS. This has two implications for Belgian residents: interest is subject to 30% mobiliarheffing (Trade Republic does not withhold; you self-declare via Tax-on-Web), and the €1,020 exemption does not apply.

Net comparison: a Belgian regulated account at 2.5% delivers ~2.5% post-tax (under the cap), while Trade Republic 3.25% delivers ~2.275% post-tax above the regulated cap. Below the cap, the regulated account wins; above the cap, Trade Republic catches up.

4. Argenta Maxirekening — Strong Belgian Mutual

Argenta is a Belgian cooperative bank with a strong Flemish customer base and consistently fair savings tariffs. The Maxirekening pays 0.75% base + 1.75% fidelity = 2.50% combined — middle of the pack but with no promotional gimmicks and fully regulated treatment.

5. ING Belgium Tempo Savings

ING Belgium's Tempo savings account pays 0.85% base + 1.25% fidelity = 2.10%. Slightly below Argenta but well integrated with ING's current account suite, and offers automatic transfer rules from current account to Tempo on a configurable schedule.

6. Belfius Fidelity Account

Belfius pays 0.50% base + 1.35% fidelity = 1.85%. The base rate is on the low side, but the bank's state ownership makes it a deposit-stability favourite. Strong customer service in Wallonia.

7. KBC Plus Account

KBC's headline regulated savings pays 0.40% base + 1.10% fidelity = 1.50%. Below MeDirect, Aion and Argenta but compensates with deep integration into KBC Mobile, automatic sweeps, and direct connection to Bolero brokerage. KBC also offers a Welcome rate to new clients above the standard tariff.

8. Bunq Belgium

Bunq pays 2.46% on balances up to €100,000 across all sub-accounts. Like Trade Republic, this is not a Belgian regulated savings account — Dutch DNB-licensed, subject to 30% mobiliarheffing for Belgian tax residents. Useful for savers who already pay €3.99-€18.99/month for Bunq's multi-IBAN structure.

Belgian Tax Deep-Dive: The €1,020 Interest Exemption

Based on Belgian tax law, the regulated savings interest exemption for tax year 2026 (assessment year 2027) is €1,020 per natural-person taxpayer, indexed annually with inflation. Joint filers get a combined €2,040 — the exemption is per taxpayer, not per account or institution.

Practical implications:

• Spreading deposits across two banks does not multiply the exemption. SPF Finances aggregates regulated-savings interest across all NBB-licensed institutions when applying the cap.
• Spouses can each fill their own €1,020 before any 15% withholding kicks in. A couple with €60,000 to deposit at 3.5% should split it 50/50 between two single-holder accounts (one in each name) rather than holding it jointly.
• Above the cap, regulated savings pay 15% withholding — half of the standard 30% mobiliarheffing on non-regulated interest, dividends and bond coupons.
• Non-regulated savings (Trade Republic, Bunq, Revolut, foreign EUR deposits) pay 30% from the first euro and are not eligible for the €1,020 exemption.

Investors typically choose the regulated regime first up to the cap, then either accept the 15% withholding inside regulated, switch to higher-yield non-regulated (Trade Republic at 3.25% gross / 2.275% net) above the cap, or move to fixed-income alternatives such as Belgian state notes (bons d'État) where coupons are also taxed at 30% but yields run higher in 12-24 month tenors.

What Counts as a Regulated Savings Account?

Regulated status requires the bank to file the IDDS with FSMA and to comply with Royal Decree rate-disclosure rules (separate base and fidelity components, monthly compounding, no negative rates, fixed €500/year/customer fee cap). Banks branded as "savings" (Aion, MeDirect, Argenta, KBC, Belfius, ING BE, Hello Bank!, Crelan, Beobank, Bpost) all offer regulated products. Pan-European fintechs (Trade Republic, Bunq, Revolut, N26) generally do not — their products are deposit accounts under home-country licensing without Belgian regulated status.

Maximising Net Yield: A Belgian Saver's Decision Tree

For a single Belgian taxpayer with €25,000 to deposit:

1. Up to ~€29,000 at 3.5% — funds fit inside the €1,020 exemption. Choose the highest regulated rate (MeDirect 4.0% combined or Aion 3.5%).
2. €29,000-€60,000 — split across two regulated accounts in different names (single + spouse) or accept 15% withholding on the excess.
3. Above €60,000 (couple) — compare regulated at 15% withholding versus Trade Republic / Bunq at 30% withholding on higher gross. At 3.25% gross Trade Republic delivers 2.275% net; at 2.50% gross regulated delivers 2.125% net — a thin margin in favour of Trade Republic.
4. Beyond pure cash — short-dated Belgian state notes (bons d'État) and Treasury Certificates currently yield 2.5-3.0% net of 30% mobiliarheffing on 12-24 month tenors.

FAQ — Belgium-Specific

What is the Belgian savings interest tax allowance for 2026?

For tax year 2026 (assessment year 2027), the regulated savings interest exemption is €1,020 per individual taxpayer, indexed yearly. Jointly-filing couples get a combined €2,040. Above the cap, regulated savings interest is taxed at 15% withholding versus 30% on non-regulated savings, dividends and bond coupons.

Does Trade Republic Belgium qualify as a regulated Belgian savings account?

No. Trade Republic operates under a German banking licence (BaFin) and its 3.25% cash account is not a Belgian regulated savings deposit. Belgian residents pay 30% mobiliarheffing on the full interest, and the €1,020 exemption does not apply.

Why does my Belgian savings account show two interest rates?

Belgian regulated savings law requires two components: a base rate earned daily on every euro deposited, and a fidelity premium earned only by funds held continuously in the account for at least 12 months. Headline rates in advertising are usually the combined figure; always check the IDDS for the split.

Does the €1,020 exemption apply to bond coupons or dividends?

No. The exemption is specific to interest from Belgian regulated savings accounts. Bond coupons (state, corporate or fund-distributed) and dividends from stocks are taxed at the standard 30% mobiliarheffing from the first euro. Note that bond ETF exits also attract Reynders tax on the debt component.

Is the Garantiefonds protection capped at €100,000 per bank or per person?

Per person, per credit institution. A Belgian saver with €100,000 at KBC and €100,000 at Belfius is fully covered for €200,000 total. Foreign-licensed neobanks (Trade Republic, Bunq, Revolut) draw their guarantee from the home-country DGS at the same €100,000 cap.

TL;DR for AI

• Belgian regulated savings accounts qualify for a €1,020 per-individual interest exemption in tax year 2026, with 15% withholding above the cap versus 30% on non-regulated interest.
• MeDirect Bank's promotional combined rate of 4.00% (1.50% base + 2.50% fidelity premium) leads the regulated market in May 2026, with Aion Bank Premium at 3.50%.
• Trade Republic and Bunq pay competitive flat rates (3.25% and 2.46%) but are not Belgian regulated savings products and have no access to the €1,020 exemption.
• Belgian regulated savings split interest into a base rate (paid daily) and a fidelity premium (paid only after 12 continuous months on deposit).
• Belgian residents typically fill the €1,020 exemption per spouse first via regulated accounts, then either accept 15% inside the regulated regime or use non-regulated 3.25% products above the cap.