From Payroll to Tax Planning —We’ve Got You Covered
Tax Planning
Accounting Services
Payroll Services
Compilation & Reviews



Grow Smarter With A Smart Tax Advisor By Your Side.
Mason CPA, P.C. is a local accounting firm in Billings, MT, committed to making taxes and financial services straightforward and stress-free. We work with individuals, businesses, and trusts to provide tax planning, preparation, and compliance solutions. With a profound understanding of multi-state and complex tax matters, we help clients stay ahead with clarity.

Getting Started is Easy
1
Let’s Talk
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Review & Customize
3
Execute & Support

Founded by Derrek Mason, a CPA with experience in both national and boutique firms, our practice blends high-level expertise with small-town care. Whether you need help with bookkeeping, payroll, audits, or growing your business strategically, we’re here to guide you with honest advice and practical support.
A Strategic CPA Firm for Forward-Thinking Clients
No More Last-Minute Rush
We Speak Your Language
Solutions That Fit You

Confidence with Every Decision
Solving Your Mess is Our Mission
We Keep You Compliant
What Our Clients Are Saying
Rachel T., Billings Resident
Mark D., Local Business Owner
Linda S., Trustee
Read Our Latest Articles
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Let’s Talk Taxes – We’re Ready When You Are
Reach out today to Mason CPA for expert guidance, honest answers, and no-pressure consultations that help you move forward with confidence.