1. Leaving significant cash in a current account
With inflation running above the interest rate on most current accounts, cash does not sit still — it shrinks. Every year that €200,000 sits unused, it loses purchasing power. The fix is not complicated: short-term government bonds or a remunerated account at 3-4% changes the outcome significantly over five years.
2. Trusting the bank's recommended fund
When your private bank calls to recommend a fund, that fund pays them a distribution fee. The recommendation is not independent — it is a product sale. The fund they recommend typically carries 1.2-1.8% in annual fees. An equivalent index fund costs 0.15-0.20%. Over twenty years on a €300,000 portfolio, that difference exceeds €180,000 in lost returns.
3. Concentrating wealth in one asset class
For many high earners, wealth means a salary, a property, and nothing else. That is concentration risk. If the property market softens, or if the income stops, there is no buffer. Institutional investors never hold a single asset class — they build structures that absorb shocks and continue growing regardless of what happens in any one market.
4. Waiting for the "right moment" to invest
Every year spent waiting for markets to be "safer" is a year of compounding lost. The data on this is unambiguous: time in the market consistently outperforms timing the market. The investor who enters in bad conditions and holds outperforms the one who waits for clarity and enters late.
5. Having no written financial plan
Without a plan — what you own, what you owe, what you are trying to achieve, in what timeframe, with what risk tolerance — every financial decision is made in isolation. Plans are not predictions. They are frameworks that make decisions consistent and measurable. Without one, every market movement becomes a crisis or a temptation.
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