IB charges for money balances

I’ve read a while ago that IB charges interest on balances accounts, whatever they are (chf or usd,…).
Is it true? Where do I find their rates?
It means that every time I buy something, I have to transfer the exact amount +/- 10-20 chf…

Here they are


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From IB

When calculating rates, IB uses a blended rate based on the tiers below. With the exception of CHF, CZK, DKK, EUR, JPY and SEK, if the benchmark rate plus the interest rate paid is less than 0 then the interest paid will be 0%. For balances held in CHF, CZK, DKK, EUR, JPY or SEK IB will apply an effective negative rate to long balances held as outlined in the table below.

Only valid for balances > 100000chf.