Polish Treasury Bonds vs Bank Deposits — Which Is Better in 2026?

Quick Answer

For short-term (up to 1 year), bank deposits win — higher nominal rates, instant access. For medium and long-term (2+ years), Treasury Bonds win — especially COI and EDO, which index to inflation and deliver positive real returns. Both are taxed at 19% Belka tax.

Head-to-Head Comparison

Interest Rates — Who Pays More?

Bank Deposits in 2026

Best deposit rates in March 2026:

• 3-month deposits: 5.0–6.5% (promotional, for new funds)
• 12-month deposits: 4.5–5.5%
• 24-month deposits: 3.5–4.5%

Caveat: top rates are usually promotional — capped amounts (e.g., up to 50,000 PLN), new customers only. After the deposit matures, money goes to a savings account at 1–3%.

Treasury Bonds in March 2026

• OTS (3 months): ~3.00% fixed
• DOS (2 years): ~3.25% fixed
• COI (4 years): ~6.75% (year 1), then inflation + 1%
• EDO (10 years): ~6.80% (year 1), then inflation + 1%

At first glance, a 3-month deposit beats OTS. But that's comparing apples to oranges — what matters is what happens in subsequent years.

Real Returns — Bonds Win Here

Scenario: 10,000 PLN Over 5 Years

Bank deposit at 5.0% (fixed, renewed annually):

• Year 1: 10,000 × 5% = 500 PLN interest → 405 PLN after tax
• Repeat × 5 years (no compounding)
• After 5 years: 12,025 PLN net
• At 4.5% inflation: real return ≈ +0.4% per year

EDO bonds (inflation + 1%):

• Year 1: 6.80% = 680 PLN (capitalized)
• Years 2–5: 5.5% on growing base (compounding)
• After 5 years: ~12,910 PLN gross → ~12,360 PLN net
• Real return ≈ +0.8% per year

Difference: 335 PLN in EDO's favor. And this gap grows every additional year thanks to compounding.

What If Inflation Rises?

This is where inflation-linked bonds truly shine. At 8% inflation:

• 5% deposit: real return = –3% per year (you're losing money!)
• EDO: pays 9% (8% + 1%) → real return ≈ +0.3% per year

EDO bonds are an automatic inflation hedge. Deposits don't adjust to inflation.

Safety — Bonds Win

Bank Deposits

Guaranteed by the Bank Guarantee Fund (BFG) up to €100,000 (~430,000 PLN). Above that — risk of loss if the bank fails.

Treasury Bonds

Guaranteed by the State Treasury with no limit. Even if you invest 10 million PLN, it's all covered.

For amounts above €100,000, bonds are unquestionably safer.

Taxation — It's a Draw

Both deposits and Treasury Bonds are subject to 19% capital gains tax (Belka tax). Tax is automatically withheld — no need to declare it separately.

One difference: bonds purchased within an IKE (Individual Retirement Account) may be tax-exempt. Deposits can't be held in an IKE.

Liquidity — Deposits Win

Bank Deposits

• Money available immediately after breaking the deposit
• Penalty: usually loss of interest (not principal)
• Some banks offer partial early withdrawal

Treasury Bonds

• Early redemption: money in your account in 5 business days
• Handling fee: 0–2 PLN per bond
• You can redeem part of your holdings (not all-or-nothing)

If you need instant access, deposits are more convenient. But 5 business days isn't dramatic — plan ahead.

Who Wins? Depends on Your Horizon

Up to 1 Year → DEPOSIT 🏦

Promotional deposits (5–6.5%) crush OTS (3%). If you need money within a year, find the best deposit deal.

2–4 Years → COI 📊

COI (inflation + 1%) beats 2-year deposits (3.5–4.5%) in most inflation scenarios. Deposits only win in deflation or near-zero inflation.

5+ Years → EDO 🏆

For long-term savings, EDO has no competition among safe instruments. Compound interest + inflation indexation = positive real returns regardless of scenario.

Best Strategy → MIX

Smart investors combine both:

• Deposit — short-term liquidity buffer (3–12 months)
• COI — medium-term goals (3–5 years)
• EDO — long-term savings core

Bank Deposit Traps

1. Promotion ≠ standard rate — That 6.5% is usually 3 months for new customers. Then you're back to 3%
2. No compounding — Most deposits don't compound interest, unlike EDO
3. Renewal hassle — After maturity, you must actively find a new deal. Bonds keep working
4. BFG cap — Above €100,000, you're not guaranteed

FAQ

Can I have both deposits and bonds?

Absolutely — and you should. Deposits for short-term, bonds for long-term. Time diversification.

What happens if a bank fails?

BFG pays up to €100,000 within 7 business days. Above that limit — insolvency proceedings, recovery uncertain.

Can bonds lose value?

Not in nominal terms — the State Treasury guarantees principal + interest. But in real terms (adjusted for inflation), fixed-rate bonds (OTS, DOS) can deliver negative returns.

What's the real difference after 10 years?

With 10,000 PLN: a 5% deposit yields ~14,050 PLN net, EDO yields ~15,735 PLN net. Difference: 1,685 PLN — almost 17% more. And the higher inflation goes, the bigger EDO's advantage.

Should I wait for better bond rates?

No. First-year rates are a small part of COI/EDO returns. What matters is inflation indexation in subsequent years. Buy now rather than wait.

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