The 12 tax offices of the Free State of Thuringia are responsible for assessing and collecting taxes, with the exception of municipal taxes. As state tax authorities at the local level, their areas of responsibility are delineated according to local and factual areas of competence.

A major focus of the tax office's activities is the processing of tax returns of employees and other taxpayers.

Based on the information provided in tax returns and, if necessary, other available information from, for example, employers, health insurance funds and insurance companies, the tax office determines the basis for taxation, sets the respective taxes and collects them. In the telephone service area, almost all concerns can be raised and information provided, for example, on tax returns.