Diehl CPA LLC is an Alaska-based CPA firm in Palmer, AK, focused on tax preparation and planning for investors, closely held businesses, and individuals. The firm works with clients who have investment-heavy or more complex returns, including issues tied to K-1s, brokerage portfolios, complex holdings, and multi-state filings.

Its services include investment tax planning, tax return preparation, retirement tax strategies, and wealth management coordination. Diehl CPA presents its work as year-round planning rather than only filing support, with attention to tax optimization, Roth conversions, withdrawal sequencing, estate coordination, and broader financial decision-making.

Founder Mark Diehl is identified as a CPA and CFE. Source material also notes his accounting degrees, prior Minnesota state tax auditor experience, and June 2023 appointment to the Alaska State Board of Public Accountancy.