I've been running a saas like this for the past couple of years.

I'm using Xolo which do the accounting and local representative. 99% of my bureaucracy is uploading pdf invoices to the Xolo system. Once a year I have to spend like one hour on the anual report. That's pretty much it.

Every 5 years you have to renew your digital id. It costs a little money and if you are in the EU there will be a pickup location not far away (I had to travel internationally).

I also have to deal with my personal taxes but that's another matter.