A conversation about getting to know each other and finding out exactly what you need is, of course, free of charge. However, as far as tax information is concerned and the consultation takes more than 2 hours, the StBGebV provides for a standard fee of 180 EUR. This will be credited to later additionally used services.
There are many tax consultants on the Internet who offer a fee calculator. This gives you a first idea of fee structure. Due to my operational organization, I can set the fees of my services well below the average.
There are very good reference books on the internet. However, in my opinion, this does not replace the personal advise, which is very important. Every tax case is different.
A flat rate of 16 EUR per employee.