個人事業 or GK/KK?

Hello,

I do consulting and have been operating as a 個人事業 for 5 years now.

My annual revenue is over 20mn JPY and I was exploring whether incorporating might be a good way to maximize my net income.
My preliminary research seems to indicate that I am better off as a 個人事業.

My clients do not require me to incorporate.

The main issue I see are that I would pay more shakai hoken, that money left in the company would not be easily accessible and harder to invest, and that accounting would be more of a pain and I would likely need to hire an accountant.

If I want to take out all the money out as a salary then Shakai Hoken will be 150k+ for health insurance and 120k for Nenkin.
Currently I pay 90k(max) + 17k.
I prefer to invest the difference in Nenkin by myself. I also have access to a bigger IDECO.

Am I missing something?

by grOSS117