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Investing money should be well thought out - especially if it involves larger amounts such as 20,000 euros and you want to secure your assets. This is precisely when it comes to building up a long-term and stable investment so that you can continue to benefit from it in the coming years and decades.

But how exactly you should do this is not easy to decipher. The financial market is full of trends and supposed experts, but may not be suitable for you and your situation at all. It is therefore advisable to plan for the long term and build up your own financial knowledge to help you increase your savings.

In this article, we want to help you with this - and therefore present 7 typical mistakes to avoid if you want to know how to invest 20000 euros.

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The most important facts at a glance

  • In order to invest EUR 20,000 successfully, you should make sure that your investment is designed according to your individual investment conditions. This includes taking into account both your expertise and your investment objectives and preferences.
  • The investment amount is also part of this: Calculate as accurately as possible, build up a sufficient financial buffer and invest only what you can really do without in the long term.
  • Especially for larger investment amounts, it is advisable to spread and diversify your capital across various investments. This prevents excessive risk of lumps forming.
  • Expert opinions and tips can certainly be helpful in your investment portfolio buidling - but you should not trust such third parties fully and also acquire your own expertise about the functioning and characteristics of different investment products.
  • Inflation risk is also on the list: An investment whose return is permanently below the inflation rate will lose real purchasing power - even if the nominal balance of the account increases.

Error #1: Invest more than is available

Inexperienced investors in particular make this mistake: Anyone who finally decides to invest their savings also wants to get the most out of it - and then invests more money than would be advisable. The problem here is that amounts that are actually needed for larger one-off payments or regular expenses such as invoices and loan instalments are tied up in the investment.

This poses major risks if unplanned expenses actually arise. Not all investments can be liquidated without problems before the end of the term. This usually involves high costs, so you end up with less money than you did at the beginning. Alternatively, investors may be forced to take out additional loans or sell assets to get the capital they need.

This is why Only invest as much money as you really have available for it - i.e. what you can really do without. Check in as much detail as possible what inputs and outputs you have each month, what additional costs are incurred and whether you have enough cushion to access if necessary.

If you want to know how to invest 20000 euros, but don't have any financial cushion, then you might want to start with a smaller amount. You can still invest more money later. 


Error #2: Speculate without sound expertise

In addition to an overestimated investment amount, the type of investment is also a frequent source of error. Investors often try to achieve the greatest possible returns on their capital in the shortest possible time and rely on short-term investment trends such as cryptocurrencies or speculative equity trading.

Although these generally offer comparatively high and, above all, fast returns, they also involve major investment risks, which are often concealed by supposed experts in blogs or videos. Here, short-lived trends or even fraud meshes are marketed as the great opportunity - all at the expense of investors.

However, even if they are completely legitimate investments, it takes a lot of expertise and an understanding of how exactly such investments work and whether they can actually generate the promised profits. Without this knowledge, investors can quickly lose a lot of money - especially if you suddenly invest larger investment amounts like how to invest 20000 euros.

However, if you still want to bet on the fastest and greatest possible gains, you should take at least enough time in advance to look in detail at the investment of your choice and identify the opportunities and risks that come with it. In this way, you remain on the safe side as far as possible - despite the high investment risk. 


Error #3: Ignore your own risk tolerance

Speaking of risky investments: Many investors underestimate the importance of individual risk tolerance. All too often, you rely on current trends or expert opinions and build your investment portfolio buidling accordingly. Your individual requirements and preferences are often neglected.

However, not every investment works equally well for all investors, on the contrary: The ideal investment portfolio buidling should be based on the individual conditions of investors so that it can also be successful in the long term and deliver the desired results.

This is particularly useful if you want to find out how to invest 20000 euros at once. If you are more sensitive to risk and react more sensitively to frequent price and value fluctuations, it may be difficult for you to give up your money in the long term, especially with a larger amount. Security-oriented investments may then be more suitable for you, even if they come with somewhat lower returns.

As valuable as external tips and opinions can be - in the end, it always depends on whether and how such investment recommendations can be implemented individually. Your own risk tolerance is a decisive factor for this. 


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1https://nachrichten.idw-online.de/2024/02/09/finfluencer-studie-forschungsprojekt-gibt-ueberblick-ueber-deutschsprachige-finanz-influencer

2https://www.bafin.de/DE/Verbraucher/GeldanlageWertpapiere/soziale_medien.html

3Federal Statistical Office (Destatis) (2026): Inflation Rate in 2025 at +2.2%, Press Release No. 019 of January 15, 2026. https://www.destatis.de/DE/Presse/Pressemitteilungen/2026/01/PD26_019_611.html

4Vanguard Research (2023): Cost averaging – Invest now or temporarily hold your cash? https://corporate.vanguard.com/content/dam/corp/research/pdf/cost_averaging_invest_now_or_temporarily_hold_your_cash.pdf