Billings, Montana • Over 30 Years
Steady, thoughtful accounting for small businesses and nonprofits
Sum CPA, PC is the practice of Holly Carter. The focus is simple: clear books, consistent processes, and reliable guidance delivered with care.
About
For more than three decades, Holly has helped organizations keep books clean, filings timely, and decisions grounded in accurate information. The goal is long-term peace of mind, not short-term gimmicks.
Areas of Focus
Support tailored to how smaller organizations really operate.
Working Philosophy
Client Resources
Frequently used links in one place. Public, official sources whenever possible.
Links are provided for convenience and may change at their respective agencies.
Simple Questions
Referral Inquiry
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