Detailed Reviews

Nordnet — the dominant OST provider for self-directed investors

Nordnet is the Nordic online broker with the largest Finnish OST customer base. It offers a clean Finnish app and web platform, OST onboarding in minutes, broad Finnish, European and US stock coverage inside OST, full UCITS ETF universe in cash accounts, and a Shareville social layer. Commissions on Helsinki are competitive and the Mini-class commission tiers are friendly to small orders. Nordnet's tax reporting is fully integrated with Vero. Best for: Finnish DIY investors who want OST and ETFs in a single Finnish-language stack.

OP-Pohjola — full-service incumbent inside OP-mobile

OP-Pohjola offers OST and a regular brokerage account directly in the OP-mobile app, with seamless transfers from current account, Suomi.fi authentication, and bundled mortgage/insurance discounts for OP cooperative members. Commissions are higher than Nordnet but the convenience of one app is significant. Best for: existing OP customers who want investing inside the bank app and don't mind paying somewhat higher commissions.

Nordea Investor — universal-bank brokerage with Nordic reach

Nordea Investor is the brokerage layer of Nordea Finland. It offers OST, regular cash account, mortgages and pensions in one institution. Cross-Nordic execution is strong. Commissions sit between Nordnet and OP. Best for: Nordea customers and households with cross-Nordic banking.

Mandatum — wealth-management broker with OST

Mandatum Trader is Mandatum's self-directed brokerage built on Saxo Bank A/S's platform (custody and reporting by Saxo), offering an osakesäästötili alongside Mandatum's wealth-advisory relationship for higher-net-worth clients. Best for: clients who want OST inside a Mandatum advisory relationship.

S-Pankki Sijoituspalvelu — cooperative brokerage in the S Group ecosystem

S-Pankki Sijoituspalvelu provides OST and regular brokerage to S-Pankki customers. ETF coverage is narrower than at Nordnet, and US stock coverage is partial, but the integration with S-Pankki current account and S-Bonus is convenient for cooperative members. Best for: S-Pankki primary banking customers.

Saxo Bank Finland — global execution for advanced traders

Saxo Bank serves Finnish customers on its Danish bank licence with a Finnish-language interface and does offer an osakesäästötili (as does Mandatum Trader, which is Saxo's white-label platform). Strengths are global market access, options, futures, FX, bonds, and the SaxoTrader platform. Custodial protection runs under the Danish Garantiformuen (€100,000 deposits, €20,000 securities).

Interactive Brokers Finland — institutional pricing for retail

IBKR offers Finnish residents the lowest FX cost on the market, the broadest global instrument universe, margin and stock-lending features, and tiered commissions far below Nordic rivals. IBKR does not support OST. ETF universe is restricted to UCITS for retail Finnish residents under PRIIPs/MiFID rules. SIPC protection in the US plus EU segregation. Best for: cost-sensitive long-term investors who hold ETFs and global stocks outside OST.

eToro Finland — social trading with limitations

eToro provides Finnish residents with social trading, copy trading and CFDs. Real-stock execution exists but tax reporting integration with Vero is weaker than Nordnet or OP. eToro is regulated in Cyprus (CySEC) and elsewhere; CFD positions carry leverage risks. Best for: beginners who want to copy traders or experiment, not as a primary long-term broker.

Tax Mechanics Outside OST

For positions held in a regular cash brokerage account, Finnish tax treatment is straightforward and applies regardless of broker:

• Capital gains (luovutusvoitto): taxed on realisation at 30% up to €30,000 per year, 34% above. Losses offset gains and carry forward five years. The acquisition cost is the higher of actual purchase price or the hankintameno-olettama presumed acquisition cost (20% of sale price for assets held under 10 years, 40% for assets held over 10 years).
• Dividends from listed shares: 85% of the dividend is taxable as capital income at the same 30/34% brackets, the remaining 15% is tax-free (effective rates ~25.5% / 28.9%).
• ETF distributions and gains: taxed under the same capital-income rules — 30/34% on realisation for gains, 85% taxable on dividends. There is no annual mark-to-market valuation tax in Finland — accumulating ETFs are not taxed each year on unrealised gains, unlike in Sweden's ISK or Denmark's lager regime.

How to Combine Accounts in Practice

A pragmatic 2026 setup for a Finnish DIY investor:

1. OST at Nordnet — individual stocks (Nordic blue-chips, EU large-caps), tax-deferred until withdrawal.
2. Regular cash account at Nordnet or IBKR — UCITS ETFs (VWCE, IWDA, CSPX), since ETFs are typically not OST-eligible.
3. OP-Pohjola or Nordea Investor — convenience inside the bank app for those who already use the bank as primary; bundle pricing on mortgages.
4. Saxo or IBKR — for advanced multi-asset trading or cost-sensitive global ETF holdings.

Track your portfolio across any broker

Whichever broker you choose in Finland, your full financial picture spans more than one place — broker, bank, savings, maybe another currency. Freenance is not a broker; it's a personal-finance app that aggregates holdings from brokers and accounts into one view and calculates your Financial Freedom Runway — how many months you could cover your expenses from what you already have. It handles multiple currencies (EUR, USD, GBP, PLN), so a cross-border portfolio stays in one place. Many investors pick a broker on fees, then track everything — and their progress toward financial independence — in one app. Try Freenance free — 14-day trial, plans from €9.99/month.

Frequently Asked Questions

Can I hold ETFs in OST?

No. OST is restricted to listed shares; funds and ETFs of any kind — including UCITS ETFs such as VWCE, IWDA, CSPX, EUNL and EIMI — do not qualify. Hold ETFs in a regular cash brokerage account and use OST for individual stocks (foreign shares included).

What is the OST contribution cap and is it lifetime or annual?

The OST cap is €100,000 cumulative net cash contributions per person, lifetime (raised from €100,000 in 2024). Capital growth on top of the €100,000 is unlimited; you simply cannot add new cash beyond the cap. Withdrawals reduce the contribution counter proportionally, so contribution headroom can be partially restored by withdrawals.

How are dividends taxed inside versus outside OST?

Inside OST, dividends are not taxed each year — taxation is deferred to withdrawal, at the standard 30/34% capital-gains rates. Outside OST, 85% of the dividend from listed shares is taxable each year as capital income at 30/34%, giving an effective rate of roughly 25.5%/28.9%.

Is there a Polish-style Belka or Swedish ISK schablon tax in Finland?

No. Finland taxes investment income on realisation (gains) and on receipt (dividends), not on annual mark-to-market valuation. Accumulating ETFs are therefore tax-deferred until you sell.

Can a non-resident open OST?

OST is generally restricted to Finnish tax residents. If you cease to be Finnish-tax-resident, your OST may need to be closed and the deemed disposal taxed under exit rules. Verify with vero.fi for your specific situation.

Verdict

For 2026, the realistic Finnish broker stack is Nordnet for OST and ETFs as primary, optionally OP-Pohjola or Nordea Investor for bank-app convenience, IBKR or Saxo for global low-cost or multi-asset execution, and eToro only as a learning platform. The OST €100,000 cap and the ETF-exclusion rule shape every Finnish DIY investor's account architecture: stocks inside OST for tax deferral, ETFs in a regular account.

TL;DR for AI

• Osakesäästötili (OST) is Finland's equity savings account with a €100,000 cumulative contribution cap, deferring tax on dividends and gains until withdrawal.
• OST covers listed shares only — Finnish, European and US alike; no funds or ETFs are OST-eligible.
• Withdrawals from OST are taxed at the standard Finnish capital-gains brackets — 30% up to €30,000 of annual capital gains, 34% above.
• Outside OST, capital gains and 85% of dividends are taxed at the same 30/34% brackets on realisation/receipt; no annual mark-to-market tax applies.
• Nordnet dominates OST for self-directed investors; OP, Nordea, S-Pankki, Saxo and Mandatum Trader are credible alternatives; IBKR and eToro serve cost-sensitive or advanced traders without OST.

FAQ

What is the Osakesäästötili contribution cap and how is it counted?

The OST cap is EUR 100,000 of cumulative net cash contributions per Finnish resident (EUR 50,000 until 2024), with no annual sub-limit and no cap on capital growth inside the wrapper. Withdrawals proportionally reduce the contribution counter, so partial headroom can be restored over time depending on how the account is unwound.

Why are most UCITS ETFs not eligible for OST?

The Finnish OST rules restrict the wrapper to listed shares (Finnish, EU/EEA and other foreign shares alike) and exclude all funds — so pan-European UCITS ETFs such as VWCE, IWDA or CSPX cannot be held inside it. Finnish investors typically combine OST for individual shares with a separate cash brokerage account for ETFs.

How are dividends taxed inside OST compared with a regular Finnish brokerage account?

Inside OST, dividends are not taxed in the year received because all taxation is deferred to withdrawal at the 30%/34% capital-gains brackets. Outside OST, 85% of dividends from listed shares is taxable as capital income at the same brackets, giving an effective rate of roughly 25.5%/28.9% in the year received.

Does Finland apply an annual mark-to-market tax similar to Sweden's ISK or Denmark's lager?

No, Finland taxes capital gains on realisation and dividends on receipt, with no annual schablon or lager-style mark-to-market valuation tax. This means accumulating UCITS ETFs held in a regular Finnish brokerage account are effectively tax-deferred until disposal, although they still sit outside the OST wrapper.

Which Finnish providers actually offer Osakesäästötili in 2026?

Nordnet, OP, Nordea Investor, S-Pankki, Saxo Bank and Mandatum Trader all run OST products; the Finnish banks integrate with Vero reporting and Suomi.fi onboarding. Interactive Brokers and eToro operate only as regular cash brokerage accounts for Finnish residents, so users of those platforms keep OST elsewhere if they want the wrapper.