Interactive Brokers - all eggs in one basket?

I have even more % at IB and I also consider to open brokerage account at PostFinance. Additionally, I created a thread to discuss IE vs US as ETF domicile. I know you choose IE and you were one of the persons who put doubts in my head about holding US. I was almost convinced I would open PF and start buying VWRL, but today I reminded myself of the total cost.

PostFinance transaction fee   0.35% (1)
Stamp duty                    0.15%
Witholding tax on VWRL        0.20% (2)
-------------------------------------
Total per transaction         0.50%
Total per year                0.20%

(1) 70 CHF per trade up to 20’000 CHF
(2) not sure about that one

At IB the fees are negligible. So, 0.8% extra cost annually. That’s massive… I don’t know if it’s reasonable to switch.

EDIT: OK I maybe mixed two things up. First three costs are transactional only, not annual. So it’s a one-off cost (ok maybe two-off cause one day you will sell). Only the withholding tax loss is annual. Chart updated.

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