Hi all. I also just got the Provisorische Steuerrechnung from my Steueramt. The thing is, they sent me an estimate for 2021, 2022 and 2023 all together, each for 33’000 CHF, and a payment deadline of 2023-09-15. So I have a month to pay 100’000 CHF 
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What happens if I don’t pay on time? Will they start levying the Verzugszins of 4.5%? Or does this Verzug apply to the deadline in the final bill?
Why did they send this only now? I never got this before. Last year I paid the tax for 2020, and didn’t get an invitation to pre-pay in advance.