Contact & Hours

  • 1449 Central Ave
    Dubuque, IA 52001
  • Phone: (563) 588-1495
    Fax: (563) 582-7749
  • Business Hours


Established in the fall of 1969, Delbert H. Winner had a vision of providing quality tax service in one stop. Sharon joined the tax service in February of 1970. The first year of business we had satellite offices in Maquoketa and Dyersville in addtion to the main office in Dubuque. Delbert and Sharon ran the firm jointly until his passing in May of 1994. The business was originally opened as a national franchise under Cencor until when the name was changed to Mr. Tax. in January 1972. We left the national franchise company and became One Stop Tax and Accounting Service in January 1974. Both Delbert and Sharon prepared tax returns previously for another nationally known firm. Over the years we have had many very loyal employees who were with us for a long length of time as well as may very loyal customers. May of the loyal customers have moved away and continued to mail us their tax information to have their tax returns prepared by us.



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