You don’t have to wait as tax authorities should take care of updating the data once the values become available. The tax tool’s numbers will be too low with missing dividends, though, if you file earlier.
It’s one reason why I prefer distributing funds, though.
Yeah I have XMME and my tax return finalisation takes longer due to this.
However I confirmed with tax office in Zurich that I don’t need to wait for data to be published. I can file my returns whenever I want and tax office will update the return when data is available.
Yes but my OCD wants the tax return files to contain the correct info, and the preliminary tax calculation to be correct as well. Also, even though I could do my taxes in January, the processing still needs to wait until ICTax is updated.
I think the problem is not so much when we get the correct dividend value for the tax declaration.
The problem is to know the ex date of the ETF, so the day on which the tax office calculates that you received (ficititious) dividends. Not to do the do the tax declaration (which you do one year afterwards), but on the current year where you want to buy or sell an ETF.
For older ETFs, you can check in ICTax the exdate of the previous year (e.g. now in 2026 the exdate of 2025). We can then assume that all years the exdate will be the same (not sure if it’s always like that).
But for an ETF which has just been launched, what will be the exdate of this year? Will we just know it next year? Then we could have the bad luck of buying the new ETF just before the exdate, and then pay taxes on the dividends of a whole year even if we have had the ETF for much less than a year.
Practical example: VT has four dividend payments annually. Next one will be in September. Last year the exdate of this dividend was on thr 19 Sep 2025, payment date 23 Sep 2025. Let’s assume this year it will be the same, plus/ minus a couple of days. For the tax office, if you have the ETF on the 19 Sep, you have to pay taxes on the dividends of that quarter. Good.
On the 20 Sep you think, “now it’s a good moment to sell all my VT and buy the new Vanguard UCITS, the cumulative version.” And then you may have the bad luck that next year you see in ICTax that the exdate for this UCITS was the 30 Sep 2026.
So in the end you may end paying taxes on dividends for 3/4 of the year with VT, and for 100% of the year with the new ETF…
So not knowing the exdate of an ETF that you buy may cost you more expensive than you think.
Share price drops on ex-date by the amount of the dividend. It doesn‘t really matter that much.
Personally, if this were to happen to me, and assuming the dividend amount is certain, I would contact the tax authority. If the dividend is not actually paid to me, I have not benefited financially from it, so I don’t see why I should have to pay tax on it.
As @Cortana pointed out, it is generally not a good idea to sell on the ex-dividend date, as the share price typically drops slightly to reflect the dividend payment.
Before taxes, for stocks and distributing ETF’s, you are completely right.
What changes is the tax you pay for it.
Let’s say you have an ETF paying a 2% dividend annually. Its price just before the ex-dividend date is 100 CHF.
After the ex-dividend date, the price drops slightly to adjust for this dividend payment, to 98 CHF. You also get 2 CHF on dividends. So in theory same amount as before (not considering Withholding Taxes on dividends)…
But when you do the tax declaration, if you have a margin tax rate of, say, 30%, you will have to pay taxes for 30%*2.00 CHF = 0.60 CHF because of this dividend.
So you end up with 99.40 CHF instead of 100 CHF: a 0.60% loss, much higher than any TER of a passive ETF.
On accumulating ETF’s, you never receive dividends, but in the CH tax system you still have to pay taxes on dividends. These taxes are for the dividends of the stocks held inside of the ETF, which are reinverted inside of the ETF.
The tricky thing is that the CH tax office considers that you receive the full amount of these dividends (which you don’t see anyway) at a specific date of the year.
I think what I’ll do is to just buy the new ETF then from now on, as I don’t see any advantage in using VWRD anymore - maybe they’ll actually lower the price at some point though
And if this specific date is e.g 31 December and you bought mid of December, you will end up paying taxes for dividends received by the fund when you didn’t actually own the fund. 
Learned it the hard way 
I would expect the dividends (in relation to aum, that will be reported) of the new VALL to be low this year as it’s continously gaining aum quickly.
Why should dividend yield be dependant on AuM?
As far as I know, they calculate the dividend yield of accumulating funds by looking at NAV and received amount of dividends/income in the annual report.
So if NAV grows by a lot due to inflows, but dividends have been received already, that lowers dividends/NAV = yield.
Well, bought my first couple of VXUD shares, always nice when the whole volume is yours for multiple days.
I had the same experience with AWEX in CHF on EBS. It was really painful compare to a VT/VTI on ARCA.
I could sold 300kusd of shares few months ago instantaneously without impact on the volume for VT.
Imagine having the opportunity to buy multiple thousands of VALL shares - once in a lifetime opportunity! 
The only shares I was able to buy in high numbers were pink sheets, lol.