Description
Where?
Your local Finanzamt (tax authority). You might have a question about your most recent tax return or how your business is being treated for tax purposes. Or perhaps your tax authority has requested that you meet with them in person.
Go to the office in the district where you’ve registered your address.
How long?
The waiting rooms are not usually crowded, so if you don’t have an appointment, it’s unlikely you’ll wait for more than 20 minutes to get someone in person.