Taxes on freelance work - No calculators available

Hi all,

I have a bit of a challenge calculating exact net salary for me through SV. I'd like to calculate this for Luzern and Zug.

Let's say total revenue from all clients on SV will be 200k per year. And my wife's salary would be 100k.

I'd want to deduct home office with is 10.5k max in Zug and ~10k in Luzern.

Where I get lost is on social security contributions. Do I need to pay the employer part of contributions as well? Is there a calculator out there that I didn't find ?

Also, why do a lot of people suggest opening GMBH? It seems it's expensive to set up, expensive to run and then I definitely need to employ myself and pay maximum tax + all the costs. As someone with not a lot of deductions it doesn't make sense, or am I missing something ?

And if I need to pay employee and employer contributions but have no unemployment protection as SV, what's the point of the SV then?

I'd also be more than happy to pay for advice if anyone has a recommendation for independent accountant/financial planner. My experience with large firms was always poor and I don't know where to find trusted independent people. Any advice welcome!