Your Trusted CPA Firm in Billings, MT

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Making Taxes Simple, So You Can Focus on What Matters

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More Than Tax Prep—We Plan for Your Success

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Build Wealth, Stay Compliant, and Sleep Easy

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Smart Tax Solutions for Individuals & Businesses

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Client Satisfaction

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What We Offer

From Payroll to Tax Planning —We’ve Got You Covered

Tax Planning

Mason CPA focuses solely on helping you with your tax needs. Whether you’re running a small business...

Accounting Services

Accounting involves recording, classifying, and summarizing financial transactions to provide a clear picture of financial health.

Payroll Services

Payroll involves more than just issuing paychecks. It includes calculating wages, deducting the right taxes...

Compilation & Reviews

Compilation and review services are part of a broader set of financial reporting options used when full audits are not needed.
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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.

The Process

Getting Started is Easy

1

Let’s Talk

We start with a conversation to understand your business or personal goals. Whether it’s taxes, payroll, or bookkeeping—we listen first.

2

Review & Customize

We review your documents, identify key needs, and propose a solution according to your situation—no one-size-fits-all here.

3

Execute & Support

We take care of the details—filings, reconciliations, reports—while keeping you in the loop and fully supported year-round.
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Average Business Savings by Hiring a CPA
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Average Cost to Hire a CPA

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.

Why People Trust Us

A Strategic CPA Firm for Forward-Thinking Clients

No More Last-Minute Rush
We stay ahead of deadlines, so you’re never scrambling during tax season again.
We Speak Your Language
Forget confusing financial terms. We explain everything in easy-to-understand language.
Solutions That Fit You
No cookie-cutter services—we create strategies based on your actual needs and goals.
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Confidence with Every Decision
We help you make smart financial moves without second-guessing or stressing over mistakes.
Solving Your Mess is Our Mission
Behind on books or disorganized? We’ll clean it up without judgment or hassle.
We Keep You Compliant
Avoid penalties and audits—we stay on top of rules, so you don’t have to.
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On-Time Filings
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Data Protection
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Audit-Free Returns
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CLIENTS TESTIMONIAL

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Clients Come Through Referrals
Real stories from real people—see how we’ve helped clients solve tax challenges.

What Our Clients Are Saying

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Legally Compliant Services
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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.

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    Contact Info

    (406) 792-1982
    derrek@masoncpapc.com

    Office Address

    3300 Central Ave Ste D Billings,
    MT 59102 United States