Steuerberatung is the word Austrians use for the service, as on the sign at a practice door or in a firm's list of services. With Bitcoin in front, it describes a specific field: declaring gains, documenting acquisition dates, treating mining income, and planning gifts or inheritances that include bitcoin. Because it names the service, the address is open to firms of every size and form. The .at ending places that service in Austria and signals familiarity with local practice.
In the tax category, this domain forms part of the Bitcoin Tax & Law DACH set. The same name is also held on the Swiss ending and can be acquired together. Suitable projects: an online tax advisory service with document upload and video consultations, an accounting firm's specialist line, a package service for annual bitcoin tax reports, or an educational site explaining Austrian tax treatment in plain language.