Serving San Mateo, California and the Greater Bay Area
We do taxes. And we do them very well.
Each business has different needs.
 
 
 

Welcome to DeMartini & Company

We are the financial partner who is committed to guide you to your success.

Old-School Integrity Meets Modern Convenience

At DeMartini & Company, we do things a little differently—and that’s a good thing. Based in San Mateo, California, we’re a boutique tax and accounting firm built on honest advice, straight talk, and reliable results. Whether you’re a real estate investor, a busy professional like a dentist or attorney, or a retiree navigating complex trusts, we deliver expert tax services with zero fluff.

Trusted by Generations—
Now and Next

We’ve earned the trust of Baby Boomers and their families over the years, and now we’re here to support Millennials and Gen Xers too—with the same no-nonsense approach and personalized attention. Looking for “individual tax prep near me” or “real estate tax planning near me”? You’ve found the right place. From annual filings to estate coordination, our clients appreciate having a local tax advisor who explains things clearly and delivers without delay.

You won’t find gimmicks or call centers here. Just a responsive, experienced team that values relationships as much as results. We pride ourselves on accessibility—whether it’s a quick call, a sit-down in our San Mateo office, or sending docs securely online, we meet you where you’re comfortable. That’s what makes us an honest tax preparer San Mateo residents continue to recommend.

Our Core Services:

We also share office space with an experienced estate planner—making us a unique resource for clients needing integrated guidance. If you've searched for a “tax firm with an estate planner nearby,” you're in the right place.

Let’s Talk—The First Step Is Easy
Whether you’re looking for trustworthy tax professionals in San Mateo or need help navigating a complicated return, we’re ready to help. Schedule a call or request a quote today to connect with a straight-talking tax advisor who knows the San Mateo community—and knows how to get the job done.

Get In Touch With DeMartini & Company

You can count on us for professional, timely, and reliable tax and accounting services. If you’re ready to get started, just fill out this form and we’ll be in touch.

I confirm this is a service inquiry and not an advertising message or solicitation. By clicking “Submit”, I acknowledge and agree to the creation of an account and to the and .
I consent to receive SMS messages and agree with the