Personalized, Proactive, and Precise

Tax Preparation & Planning

At DeMartini & Company, tax work is more than filing returns—it’s about building a strategy that works for your life and your business. Based in San Mateo, California, we provide year-round tax preparation and planning services designed to help individuals, families, and small business owners minimize risk, avoid surprises, and make smarter financial decisions.

Our approach is thorough and tailored. Whether you’re a working professional, a real estate investor, or managing a small business, we take the time to understand your full financial picture—not just the numbers on the page. We help you stay compliant, identify savings opportunities, and navigate ever-changing tax laws with confidence.

Our services include:

  • Individual and business tax return preparation

  • Multi-year tax planning strategies

  • Estimated tax payment guidance

  • Income and deduction planning

  • Coordination with investment and legal advisors

  • State and federal compliance reviews

From simple to complex, we’re known for our attention to detail and responsive communication. We don’t just crunch numbers—we explain what they mean, help you plan ahead, and make sure you’re never caught off guard at tax time.

Looking for a smarter approach to your taxes? Contact DeMartini & Company today to schedule a consultation and discover how proactive tax planning can protect your income and support your goals—all year long.