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-montana-extract.csv No state license number is on file. Specialties are blank until this preparer claims the listing. CPA Seek does not contact preparers.

Spencer Peter Tihista Marks

CPA · Oilfield Tax Services, LLC

Helena, Montana 59624

Spencer Peter Tihista Marks, CPA in Helena, MT

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Spencer Peter Tihista Marks, CPA in Helena · CPA Seek