The formula
Real return = (1 + nominal return) / (1 + inflation) − 1.
The naive subtraction (nominal − inflation) is close enough at low rates but increasingly wrong as both numbers get larger. Examples:
| Nominal | Inflation | Naive (n − i) | Correct |
|---|---|---|---|
| 10% | 3% | 7% | 6.8% |
| 30% | 20% | 10% | 8.3% |
| 50% | 45% | 5% | 3.4% |
| 80% | 65% | 15% | 9.1% |
At high inflation rates the naive subtraction overestimates real returns by 30–50%. Use the proper formula.
What "real" buys you
Real returns measure purchasing power. A 20% real return means you can buy 20% more goods and services than before. Nominal returns just measure how the numbers on your statement change.
If your goal is "I want to send my kid to college in 10 years," what matters is whether your portfolio buys 4 years of tuition at then-current prices. The nominal value is irrelevant if tuition has gone up faster than your investment.
The TL deposit illusion
Turkish deposit rates in 2026 are headline-attractive — often above 40% annually. Real returns from these have been mixed: in some years positive, in others negative. The pattern matters more than any single year:
- When real returns are positive, holding TL deposits is a meaningful strategy.
- When inflation accelerates faster than the central bank moves rates, real returns turn negative even if nominal is high.
- The currency-protected scheme (KKM) blurred this further: nominal returns linked to currency moves, with a state-financed top-up.
The lesson isn't "deposits are bad" — it's "always look at the real return, not the headline rate."
USD as a Turkish saver's reference
Many Turkish savers anchor on USD. This isn't because USD is intrinsically better — it's because USD historically has lower inflation, so USD-denominated assets preserve purchasing power across most TL inflation cycles. The trap: USD itself has had ~3% inflation in recent years, so a 0% return USD account also loses real value, just slower.
A useful frame: think of your savings in two pots. One pot in TL (for TL-denominated future expenses), one in USD/EUR/gold (for purchasing power preservation against TL-specific shocks). The split depends on where you'll spend the money.
Equities and inflation
Over the very long run, equities tend to beat inflation by 4–7% per year in real terms across major markets. Year-to-year this varies enormously. In high-inflation episodes, equities of asset-heavy companies (real estate, infrastructure, exporters with USD revenues) tend to outperform asset-light services in real terms — but the variance is high.
The Turkish stock market in inflationary periods has produced large nominal gains and decent (sometimes large, sometimes negative) real returns. A common mistake: looking at BIST 100 chart in TL and thinking "100% in 18 months!" when real returns over the same period were 10–20%.
How to think about your portfolio
- For every return number you see, ask: is this nominal or real?
- Convert nominal to real using the proper formula, not subtraction.
- Pick a relevant inflation measure. Headline CPI is a starting point; ITO/Istanbul CPI may matter for Istanbul-specific spending; rent and education inflation are sub-indices that diverge.
- Compare real returns across asset classes, not nominal. A 35% TL deposit may underperform a 15% USD bond in real terms during a TL depreciation year.
The simplest mental upgrade
Whenever someone tells you they made X%, immediately ask "over what period, and what was inflation during that period?" Half the time the conversation will reveal that the real return was much smaller than the nominal — or even negative. Doing this in your own head before celebrating a paper gain is the single highest-leverage habit for investing in high-inflation environments.