Thanks. That would explain what happened.
So I worked out the simplified formula for the refund to be:
refund = min(US_div * 15%, US_div * eff_tax_rate * (100% - mgmt_cost / (US_div + IE_div)))
In my case:
refund = min(1071 * 15%, 1071 * 23.49% * (100% - 4000 / 4993))
= min(161, 1071 * 23.49% * 19.89%)
= min(161, 50.04) = 50.04
I am mostly interested in the following bit:
100% - mgmt_cost / (US_div + IE_div)
So if your management costs (which are capped at 0.3% of your total portfolio) exceed your total dividend, you get no DA-1 refund, as this formula above goes into negative, right?
So let’s consider a typical case:
portfolio_value: 1'000'000 CHF
management_rate: 0.3%
management_cost: 3'000 CHF
dividend_rate: 2.00%
dividend_income: 20'000 CHF
reduction_rate : 3'000 CHF / 20'000 CHF = 15.00%
But in my case, the dividend income is very small (only 5’000), which makes the reduction super high. So I guess once TSLA starts paying dividend, I should get a smaller reduction? And the self-management cost is anyway capped at 6’000 CHF, so that means above a portfolio value of 2’000’000 CHF, it will stop growing, right?
I have to say, this formula is very convoluted, and I will surely forget how it all works in a week, or so. Now imagine someone new comes and asks “is it worth it to hold US-domiciled stock and get a DA-1 refund”? The only answer will be: it depends on 10 different factors. Whenever I deal with taxes, I just want to