About Us

Get to Know DeMartini & Company

The success of an accounting firm depends upon how well it understands the needs of its clients and how competently and efficiently it meets those needs.

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Welcome to DeMartini & Company

Taxes are serious, but they don’t have to be confusing. Whether you’re filing as an individual, managing multiple real estate investments, or handling trust-related work, you deserve answers that are clear, fast, and rooted in experience. That’s exactly what DeMartini & Company delivers.

We’re a San Mateo tax firm built for real people, not big corporations. Our clients are dentists, attorneys, veterinarians, real estate owners, and growing families who need solid tax planning and efficient preparation.

We’ve worked with hundreds of Baby Boomers, but we also know it’s time to welcome in a new generation. Millennials and Gen Z — yes, we’re talking to you. Whether you’re just starting to invest or navigating your first trust return, we’ll help you make sense of it without a song and dance.

DeMartini & Company

What makes us different?

  • We’re human first. You won’t get trapped in an automated phone system or buried in jargon.

  • We’re modern, but not flashy. We use the tech you need — and none that you don’t.

  • We’re honest. If something looks off, we’ll say so. If your return’s a mess, we won’t pretend otherwise. That’s what trust looks like.

  • We’re efficient. We work hard during tax season so we can enjoy Tahoe, family, and the Sharks game after. (Yes, we’re big fans.)

We share space with an estate planner, which makes trust and estate work especially seamless, and we love collaborating with your other advisors to make sure everything lines up.

This isn’t a place for drawn-out explanations or handholding. But if you want straight talk, sharp numbers, and someone who respects your time? You’ll fit right in.

Call (650) 343-5900 or email christian@dmctax.com today to get started.

Our niche in the profession centers on providing planning, taxation and accounting services to: