About Us


Our three CPAs (Laurie Brogan, Sarah Graves, and Sean Brogan) have over 45 years of combined experience in public accounting

A Range of Talents

We serve a variety of clients, including tax services for individuals and their businesses, as well as audit services specializing in not-for-profits and construction companies

Contact Us

Get in Touch

Mangis Accounting

923 Broadwater Square, Billings, Montana 59101

(406) 252-5550

Summer Hours

Monday - Thursday: 8am - 5pm

Friday: 8am - 4pm

Saturday - Sunday: Closed