Real vs Nominal Returns — Why It Matters

Two Faces of Investment Returns

When a bank tells you a deposit yields 5% annually, that's the nominal return. It's the raw number — how much money appeared in your account. But it doesn't tell you the most important thing: how much more you can actually buy with that money.

The real return is the nominal return minus inflation. And that's the only number that truly matters for your wallet.

A Simple Example

Let's say you invested 10,000 PLN.

In Scenario C, your account grows but your purchasing power shrinks. You're earning nominally while losing in real terms. This is the trap many savers in Poland fall into.

How to Calculate Real Returns Precisely

The simplified formula is: real return ≈ nominal return – inflation. But the precise formula (the Fisher equation) is:

Real rate of return = ((1 + nominal rate) / (1 + inflation)) - 1

Example: a 5% deposit with 4% inflation:

• Simplified: 5% - 4% = 1%
• Precise: ((1.05) / (1.04)) - 1 = 0.96% ≈ 1%

The difference is small at low rates but grows at higher values. With 15% inflation and a 20% return, the simplified formula gives 5%, while the precise one gives 4.35%.

Now Add Taxes

In Poland, capital gains and interest income are subject to the Belka tax — 19%. This changes the math dramatically.

Back to our 5% deposit with 4% inflation:

1. Nominal return: 5%
2. Belka tax (19% on gains): 5% × 0.81 = 4.05% after tax
3. Inflation: 4%
4. Real return after tax: 4.05% - 4% = 0.05%

Your "five percent deposit" gives you a real return of approximately 0.05%. Practically zero.

And when inflation exceeds 5%? You're losing money even though you're officially earning interest.

Why This Matters Especially in Poland

Historical Context

In 2022–2023, when inflation reached 14–18%, even the best bank deposits (8–9%) delivered deeply negative real returns. Savers were losing several percentage points of purchasing power annually, despite seemingly attractive interest rates.

Current Situation (2026)

With inflation at 3.5–4.5% and deposits offering 4–6%, the situation is better but still not obvious. After accounting for the Belka tax, many deposits deliver real returns near zero.

Where to Find Real Returns

Inflation-Indexed Bonds (COI, EDO)

These bonds are designed to automatically account for inflation. Interest = margin + CPI, so the real return is (roughly) the margin itself. The EDO series (10-year) offers a 1.75% margin — that's a genuine real profit.

Stock Market / ETFs

Historically, global stock markets have delivered average annual returns of 7–10% nominally, which translates to 4–7% in real terms after inflation. But note — that's a long-term average. Short-term returns can be negative.

IKE and IKZE Accounts

IKE (Individual Retirement Account) and IKZE (Individual Retirement Security Account) are Polish tax-advantaged accounts that let you avoid the Belka tax. This automatically improves your real return by that 19%.

Real Estate

Rental income and property appreciation have historically kept pace with or exceeded inflation. But this requires significant capital and active management.

Real Returns and Retirement Planning

Nominal vs real thinking makes an enormous difference in long-term planning.

Example: You want to have one million PLN in 30 years.

• Nominally: at a 7% return, you'd need to save ~880 PLN monthly
• But after 30 years at 3% inflation, one million PLN will be worth about 410,000 PLN in today's money
• To have a real million (in today's purchasing power), you'd nominally need ~2,430,000 PLN
• That means ~2,100 PLN monthly

The difference is more than double. Ignoring inflation in retirement planning is a recipe for disappointment.

Tools like Freenance help you track your progress in real terms, not nominal ones. The "Financial Freedom Runway" feature provides context on your actual financial position, accounting for the economic environment.

Practical Tips

Always Ask: "After Inflation?"

When someone tells you about an investment return, immediately convert it to real terms. It's simple subtraction, but it changes your perspective entirely.

Be Skeptical of "Compound Interest Magic" in Presentations

Investment firms love showing charts with nominal returns — they look impressive. Real charts are less spectacular but more honest.

Compare Apples to Apples

When comparing investments, all returns should be in the same "currency" — real terms. A 5% deposit vs. a 10% ETF isn't a 5% vs. 10% comparison if the ETF is denominated in USD (adding currency risk).

Don't Ignore Costs

Management fees, brokerage commissions, and currency spreads are additional deductions from your real return. Look for low-cost instruments.

FAQ

How can I quickly check the real return on a deposit?

Simple formula: take the deposit rate, subtract 19% (Belka tax), then subtract current inflation. Example: 5% deposit → after tax 4.05% → with 4% inflation → real return ≈ 0.05%.

Do inflation-indexed bonds always deliver a real profit?

Almost always. The only exception is when inflation is negative (deflation) — then your return is just the margin. In practice, deflation is very rare in Poland.

Why don't banks show real rates of return?

Because they'd look bad. "5% deposit!" sounds much better than "0.05% real return after tax." Banks aren't required to show real rates, so they don't. You need to calculate it yourself.

Is there an investment that guarantees real returns?

No risk-free investment guarantees high real returns. Inflation-indexed bonds deliver real returns at the margin level (1–1.75%), which isn't much. Higher real returns require accepting more risk (stocks, real estate). The key is diversification and patience.