Listed as a CPA in IRS public preparer records. Source: IRS PTIN FOIA extract (Feb 2026), retrieved October 23, 2026. https://www.irs.gov/pub/foia/foia-illinois-extract.csv No state license number is on file. Specialties are blank until this preparer claims the listing. CPA Seek does not contact preparers.

Margaret McMahon

CPA · McMahon & Co., Ltd.

Lake Forest, Illinois 60045

Margaret McMahon, CPA in Lake Forest, IL

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Margaret McMahon, CPA in Lake Forest · CPA Seek