Last year, i lost my job due to the corona virus (November).
Today i received the interim Taxbill for 2021.
They did not changed anything (unbelievable), i processed my taxes for 2020 at the end of feburary 2021 and declared, that i am unemployed since december and that my income will be a lot less then 2019.
Last year they lifted my income, from what i have to pay taxes , by 20k sfr.
Could not believe , what i saw in the bill (i should pay the same amount as last year).Now I work as security in zurich (zwischenverdienst), to pay the bills.
But i need a GA to get there (4080 sfr per year).
No reaction to my tax declaration from february 2020 as well.

I wrote 2 emails , will see what happens .

Exactly. Talk to them. It's only provisional, and if you know you're going to earn less, you won't have any interest to pay.

We always get a paper with the provisional tax-bill, where they ask whether they got it about right. You can state on it if it's totally out and send the paper back.
Provisional bills can always be paid in parts. Pay the June part, talk to them and by the next due date they may have already sorted it out, by having replaced the provisional bill.
Most tax-declarations are handed in by end of March. It is absolutely not possible to have them all checked in time for provisional bills so those are based on the previous ones.
One thing about Thurgau: When living there I had to take half a day off every year, go explain our tax-declaration in person - and walk out being agreed to on every single point. I was warned I would have to do exactly that before I moved there and that's how it was.

When salary rises, it's no problem being taxed on last year's level, when it drops it is always a bit difficult until it's levelled out. In the end it will all be sorted.

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It's all a matter or perspective.
So move your butt and look at it from the other side

well, they expect the first payment at the end of may (33%)

Problem sorted, will get a new bill with 20 k less as the calculation basis.

Hope to get a new job somewhere, it is makes me feel bad, i want to relocate, there is nothing going on here, no jobs, no perspective, ..........

Unless you become an apple or pig farmer moving is a great idea

All the best.