Meet
Our CPA Tax Leader
For more than 15 years, Lillian Xiong, CPA has helped individuals and businesses navigate their taxes with clarity and confidence. She brings a rare blend of deep corporate tax expertise and a personal, patient approach that makes tax filing stress-free for her clients.
Lillian built her career in Denver as a trusted tax professional within complex, multi-state organizations. She spent over a decade at Amstar Group as a Senior Tax Analyst and Tax Supervisor, handling everything from corporate tax filings to audit coordination, compliance, and multi-entity reporting. She later served as the Director of Corporate Taxation for Spectrum Retirement Communities, where she led the tax department and oversaw all federal and state filings for a large national enterprise.
Today, Lillian brings that same level of precision and professionalism to individuals, families, and businesses seeking dependable and accurate tax preparation. Clients appreciate her attention to detail, calm communication style, and commitment to making the filing process clear and manageable—no jargon, no surprise fees, and no rushed shortcuts.
Whether you’re filing your annual return, handling multi-state reporting, or ensuring compliance for your small business, Lillian provides the care, accuracy, and integrity you should expect from a seasoned CPA.
Our Services
What We Offer
At Abacus Financial Services, we provide comprehensive tax services including tax preparation, business tax filing, tax planning, and IRS audit representation. Our experienced team is dedicated to guiding you through tax law changes and managing your tax exposure.
Tax Preparation for Individuals
Tax Filing for Businesses
Strategic Tax Planning
Expert IRS Audit Representation
Our Track Record
18
Years serving clients
100%
Client satisfaction
10+
Years managing complex corporate tax filings
Why Choose CPA Tax Leadership?
Maximizing Your Refunds
Stress-Free Tax Filing
Strategic Tax Planning
Minimizing Tax Liabilities
Tailored Tax Solutions
Ongoing Tax Support
Client Testimonials
See What Our Clients Say
Nanxi Liu
CEO of Blaze.tech
"As our startup doubled in size this year, Lillian kept our taxes flawless and stress-free. She helped us stay compliant across multiple states and always explained everything clearly. She’s become an essential part of our tax planning."
Julian Chan
"Lillian has been my CPA for the past four years, and I can honestly say I’ve never felt more at ease during tax season. She is thorough, incredibly patient, and always takes the time to explain things in a way I can understand. I trust her completely and wouldn’t go to anyone else."
Jonathan Maroko
"Choosing Abacus Financial was the best decision I made for my personal tax preparation. Their expertise and commitment to client satisfaction are unmatched."