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It depends on how many years you continue to invest.

"You would save €96.00 a year by switching ETFs. Switching to the cheaper ETF would generate costs of -€2.00 and taxes of -€1,994. You would have earned these back after 21 years through the savings". Source: Finanzfluss (here the further investment was not taken into account, but it is important!)

This is with taxes but without the tax-free allowance. This would reduce your tax burden.
If you continue to invest, the time to net savings goes down and it is worth switching more and more.

This means that if you keep throwing in €100 every month, you will significantly reduce the years.
As an example with a tax-free amount, it's worth switching after 18 years.
With €100 per month, I think you'll end up with 13 or 14 years.
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@cashwithhead By the way, the ETF I used for comparison is this one $PR1W or $PRAW
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@cashwithhead Performance is also not included. With higher performance, the TER pulls away more. This also kills years if you get above the 8% average. For example, if the world no longer makes 8% but 9 on average