Increase equity during the savings phase

You are talking about the spread. That means you are presenting the tolerable amount. That is not a risk. That is your assumed risk-bearing capacity.

I am talking about the probability that one of the scenarios occurs. That is the actual risk.

There is hardly any (reasonable) financial product that corresponds to your desired term and realistically offers a significantly better return without residual risk exceeding your 30%. (This is not to say it doesn’t exist at all, but it would be very special)

What about 100% risk profit/loss?

The bandwidth is never at 100% plus and minus at the same time.

Off the top of my head, Greek government bonds come to mind... basically any investment outside the government/European protection system... and basically even any investment within the protection system. So also your [Tagesgeld] (just with a very low probability).

Hello MichiQM,

short and painless: leave the money in the overnight money account, ignore the meager interest, focus on building the house.

Why do you want to take a risk with the investment when you will need your money for building a house in the foreseeable future? Even for 2% return, you really have to think carefully nowadays. Here, effort/return and risk/return are not in a reasonable balance.

By the way, I would not only concentrate my money but also my time and energy on this project. That brings more "return."

Best regards
Andreas

Invest 150 € in funds, the rest in a savings account. That way you take your shot at risk. Then after 3 years you have 5,400 € in funds on the line.

They can be worth 0-100,000 € in 3 years.

Depending on the interest rate of your current [Tagesgeldkonto], you could try to optimize the interest rate by switching providers.