Ahonen & Tregembo, PLLC is an Ironwood, Michigan accounting firm serving public, private, and non-profit entities as well as individuals, businesses, trusts, and estates. The firm provides accounting, auditing, bookkeeping, and payroll services, with support for sales tax preparation, income tax preparation, and tax planning.

The firm also works with clients on business, individual, and estate tax planning and consultation. Its services include setup and training for computerized bookkeeping, giving clients practical support for maintaining organized financial records.

Operating under the Ahonen & Tregembo, PLLC name effective June 1, 2025, the firm identifies Karl (Gus) T. Ahonen and Leann M. Tregembo as ownership members. Source materials state Michigan and Wisconsin licensing for Ahonen and Michigan licensing for Tregembo.