About Mixon Tax Law Firm

Mixon Tax Law Firm didn’t emerge from a calculated business plan or corporate strategy. Attorney Phillip Mixon built this Houston-based practice around a straightforward observation: people facing serious tax problems deserve both sophisticated legal expertise and genuine personal attention—not one or the other, but both. When clients work with Mixon Tax Law Firm, they’re not navigating a massive downtown operation where cases become file numbers. They work directly with Attorney Mixon, and that’s by design. The firm has witnessed what happens when clients get shuffled between different lawyers and staff members—critical details vanish, deadlines slip, and clients pay the price. The practice operates on one foundational principle: when someone’s financial future hangs in the balance, they deserve representation that combines technical mastery with direct accessibility.

Mission Statement

At Mixon Tax Law PLLC, the firm provides strategic, trustworthy tax counsel that protects clients’ interests and empowers confident financial decisions. The practice combines deep expertise with personal attention to deliver clear, effective solutions.

Best IRS Lawyer in Houston and What to Look For

Core Values

Integrity

Integrity

The firm acts with honesty, fairness, and professionalism in everything it does.

Client Focus

Client Focus

Every client receives personalized, responsive service tailored to their goals.

Excellence

The practice pursues mastery in tax law and upholds the highest standards of quality.

Strategic Insight

Strategic Insight

Complex tax issues are solved with clarity, creativity, and foresight.

Accountability

Accountability

The firm takes ownership of its work and delivers results clients can rely on.

Community

Community

Mixon Tax Law is proud to serve and give back to the Houston community it calls home.

The Mixon Tax Law Approach

At Mixon Tax Law Firm, clients work directly with Attorney Phillip Mixon on every case. The practice intentionally maintains a boutique size to ensure every client receives the personal attention and expert representation they deserve.

This focused approach means cases aren’t delegated to junior associates or staff members. When clients hire the firm, they receive Attorney Mixon’s personal involvement from initial consultation through final resolution. This direct relationship ensures clear communication, strategic consistency, and the benefit of his unique dual expertise on every aspect of each case.

The firm’s concentrated practice area allows it to stay current on the latest tax law developments and IRS procedures, ensuring clients receive the most effective representation possible for their specific tax challenges.

Meet Phillip Mixon, CPA/JD

Managing Attorney

Phillip Mixon brings substantial expertise and a distinguished professional background to his Houston tax law practice, ensuring clients receive exceptional representation in all tax-related matters.

Attorney Mixon holds a rare dual qualification as both a tax attorney and Certified Public Accountant (CPA). With both his CPA license and Texas bar license active, he offers a unique combination of legal and financial acumen that benefits clients facing multifaceted tax challenges.

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Background & Big Four Experience

Phillip’s career began at one of the Big Four accounting firms, where he developed his skills in the Mergers and Acquisitions (M&A) tax department. At his previous employer’s firm, he played a central role in advising clients on the tax implications of corporate transactions, ensuring compliance and optimizing tax outcomes during high-stakes deals. His Big Four experience provided invaluable insights into the complexities of tax law and corporate finance, which he now leverages in his current practice.

Those years at his previous firm involved corporate transactions worth hundreds of millions of dollars, where precision was mandatory and deadlines were immovable. That demanding environment taught him how to identify workable solutions under extreme pressure—a skill that serves his clients exceptionally well when facing IRS disputes or complex tax controversies.

Current Practice Focus

Today, Attorney Mixon focuses his practice on IRS and state tax controversy matters. His extensive background enables him to expertly handle disputes with taxing authorities, providing strategic advice and representation to individuals and businesses facing audits, assessments, and other tax-related challenges. Whether negotiating with the IRS, contesting state tax determinations, or navigating complex tax regulations, his clients can trust they’re in capable hands.

This controversy experience informs the tax planning advice he provides—he understands what triggers IRS scrutiny and how to structure planning to minimize audit risk while achieving optimal tax results.

Frequently Asked Questions

About the Practice & Approach

Attorney Mixon holds both CPA and law licenses, which is highly unusual. Most tax professionals can handle either the accounting side or legal representation, but not both at an expert level. When clients face serious tax problems, they need someone who can see the complete picture—what went wrong with the numbers and how to fix it legally.

He grew frustrated with clients getting shuffled between different people and important details getting lost. When someone’s financial future is at stake, they deserve to work directly with the attorney handling their case, not get passed to junior associates.

Both, and they’re connected more than people realize. The firm has seen business tax problems destroy people personally, especially with trust fund recovery penalties. Having someone who understands both sides has literally saved clients from bankruptcy.

Everything from individuals with audit notices to business owners facing multi-million dollar disputes. The benefit of keeping the practice small is that every client receives Attorney Mixon’s personal attention, regardless of how complex their case is.

Background & Experience

It means when the IRS challenges a tax position, he can analyze the accounting that created the problem and fight for clients legally. Most practitioners can only do one or the other, which leaves gaps in defense that can prove costly.
His previous career experience taught him how to handle incredibly complex situations under extreme pressure. Those skills translate perfectly to IRS disputes—he knows how to find solutions when everyone’s panicking and the stakes are high. Plus, he learned sophisticated strategies that he can now apply for small business owners.
Yes, and that’s a significant advantage. As a licensed attorney, he can take cases all the way to federal court if needed. CPAs and enrolled agents can’t do that, so if a case gets complex, clients would have to start over with someone else.
IRS audits, collection actions, business owners getting hit with personal liability for payroll taxes, and international compliance issues that people didn’t even know they had. Each one requires a different approach, but they all benefit from having both accounting and legal expertise.

Working With Clients

Clients talk directly to Attorney Mixon. He handles his own phone calls because he needs to understand what’s happening with cases immediately. When clients have questions or urgent issues arise, they’re not going through assistants who have to “check with the attorney.”
The firm reviews all notices and paperwork, explains what’s really happening in plain English, and determines the best options. No legal jargon, no sugar-coating—just straight talk about where clients stand and what can be done about it.

Yes, because the firm understands that tax problems usually come with money problems. Payment arrangements can be structured that make sense for clients’ budgets while still providing the representation needed to resolve issues.

Attorney Mixon keeps clients updated on case developments, and when they call with questions, he actually answers. The firm doesn’t believe in leaving clients in the dark wondering what’s happening with their cases. Clients are already stressed about their tax problems—the last thing they need is to wonder if their attorney even remembers their name.

Results & What to Expect

During consultation, Mixon reviews your complete tax situation, analyzes IRS correspondence, and evaluates your financial position. You’ll receive honest assessment of your options, realistic explanation of potential strategies, and clear discussion of next steps. The firm provides direct answers to your questions and straightforward guidance on the best path forward.

The firm’s controversy experience actually makes it better at planning. Attorney Mixon knows what triggers IRS scrutiny and how to structure things to minimize audit risk while still achieving clients’ goals. It’s like having inside knowledge of what gets people in trouble.
That’s exactly why clients want an attorney handling things from the beginning. Attorney Mixon can take cases wherever they need to go, including federal court if necessary. Clients won’t have to start over with someone else or worry about gaps in their representation.

Why Clients Choose Mixon Tax Law

Houston-area businesses and individuals trust Mixon Tax Law Firm with their most challenging tax matters because the practice delivers both sophisticated expertise and personalized attention that larger firms simply cannot match.

Unique Dual Qualification

Attorney Mixon's CPA/JD combination provides comprehensive expertise in both accounting principles and tax law, giving clients advantages that single-credential practitioners cannot offer. This dual background means the firm understands not just what happened, but how to fix it legally.

Big Four Experience with Personal Service

The sophisticated strategies and technical expertise learned at his previous employer's firm are now available to individual clients and small businesses who need expert representation. Clients get big-firm knowledge with boutique-firm attention.

Complete Legal Protection

As a licensed attorney, Phillip Mixon can represent clients at every level of the tax system, including federal Tax Court. All communications are protected by attorney-client privilege, providing legal safeguards that other tax professionals cannot offer.

Direct Attorney Access

When clients call the firm, they speak directly with Attorney Mixon. No phone tag with staff members or junior associates—just immediate access to their attorney when they need answers or urgent assistance.

Proven Track Record

The firm has successfully resolved complex tax disputes, stopped collection actions, and achieved favorable outcomes for clients facing potentially devastating tax penalties. Real results for real people facing serious tax challenges.

Tax Counsel You Can Count On

Not just one-time problem solvers—we build lasting relationships as your ongoing tax law resource, providing strategic guidance through business growth, life changes, and evolving tax challenges over years, not just single engagements.

Client Success Stories

Read reviews from Houston-area clients who have experienced Mixon Tax Law’s professional representation and achieved favorable outcomes in their tax matters.

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Group 52

Mr. Phillip Mixon was a very competent attorney in dealing with every specific detail of my complex tax issues. He was very personable, considerate, and thoughtful – I felt he gave me his most honest opinion. His office staff was also professional. He always answered his phone, which eased my mind considerably when I had questions. I felt his fees were very reasonable. I would highly recommend his legal expertise, and I would definitely use his services in the coming years if the need arises.

Susanne Allen
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Group 52

Phil helped me with my tax returns this year, and I’m never going to anyone else. He was professional and more importantly convenient. Any questions I had he helped with and it was the easiest April of my life so far.

Nick Borgman
pp
Group 52

I’ve known Phillip professionally for 7 years. As a fellow CPA, I would recommend him to anyone needing legal representation for tax issues.

Stephanie Beckett
pp
Group 52

Phillip was great during my consultation and helped me figure out my tax issues. Highly recommend.

Sebastian
pp
Group 52

Phillip Mixon is knowledgeable, responsive, and follows through with every task at hand by going above and beyond with an excellent level of representation. I feel “heard” which is very important to me as a female business owner.

Kim O’Neill
pp
Group 52
He’s a very genuine guy and someone to go to if you need help! Definitely top notch.

Sierra Robertson
pp
Group 52
I had a unique issue with my tax returns and needed professional help. Phil helped explain and demystify some of the confusing concepts in layman’s terms and ultimately resolved the issue for me.

G Wolk
pp
Group 52
One of the best tax attorneys I know. If you are in need of a tax attorney, he comes highly recommended. Very professional, trust me you want be disappointed.

Deja Sams
pp
Group 52
Phillip is an exemplary tax lawyer his research and development tax incentive helped me save a lot of money and gave me tools I needed to push my business into this next fiscal year with more growth in mind.

Chris P
pp
Group 52
I’ve been looking for an attorney and a CPA. It didn’t cross my mind to look for a tax attorney, so I’m very happy I found Phillip. He’s super knowledgeable and helpful with my tax and legal issues. Highly recommend him to anyone in need of legal assistance in taxes. He also gives free consultation so go get it friends!

Ceecee Nguyen

Contact Mixon Tax Law Firm

Ready to resolve tax challenges with experienced legal representation? Contact Mixon Tax Law today to discuss how the firm’s comprehensive legal services can protect your interests and achieve the best possible outcome for your situation.

📞 Call (713) 814-4737 to speak directly with Attorney Mixon about your tax matter. He handles consultations personally to ensure you receive immediate expert assessment and strategic guidance tailored to your specific circumstances.

📍 Serving Houston and surrounding areas including Harris County, Fort Bend County, Montgomery County, and beyond with comprehensive tax legal services. The firm also handles federal tax matters for clients nationwide who need sophisticated legal representation.

Don’t let tax problems control your life or business. With the right legal representation combining accounting expertise and legal advocacy, even the most complex tax issues can be resolved favorably.

Tax Law Resources

Stay informed with insights from the Mixon Tax Law blog featuring practical guidance on tax law developments, IRS procedures, and strategies for resolving complex tax challenges.

Attorney Mixon regularly writes about current tax law changes, audit preparation strategies, collection defense techniques, and business tax planning opportunities. All content is written from the perspective of a practicing attorney who handles these cases daily and understands what actually works in real-world situations.

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Our Staff

Ashley Headshot

Ashley Acosta

Managing Attorney

Ashley Acosta is a dynamic and driven student at the C. T. Bauer College of Business, University of Houston, where she is pursuing a Bachelor of Business Administration in Finance and Marketing, with an expected graduation in May 2026. With a strong academic foundation, she has consistently demonstrated her commitment to excellence and leadership, earning recognition on the Dean’s List in Fall 2022 and Fall 2023.

Ashley is actively involved in various academic projects, showcasing her collaborative and analytical skills. In Fall 2023, she worked on a sponsored project for FORVIS as part of her BUSI 3302: Connecting Bauer to Business course. Leading a team of eight, she conducted extensive research to enhance FORVIS’s social media presence, focusing on identifying platforms that would attract both clients and potential employees. She spearheaded the research efforts, ensuring accuracy and timeliness, and played a crucial role in presenting the results to the FORVIS Houston office. In addition, Ashley has developed her professional selling skills through a Dell Technologies Sales Roleplay project in her MARK 3337: Professional Selling class, where she worked alongside her team to compose a comprehensive business proposal. She demonstrated strong communication and negotiation abilities, role-playing as a Dell Technologies sales representative, and effectively engaged with the University of Houston IT department.

Professionally, Ashley has gained valuable experience as an Accounting Intern at Mixon Tax Law since August 2024. Her responsibilities include preparing tax returns, providing administrative support, and assisting with property tax litigation. She also drafts and files company formation documents, honing her organizational and legal skills in a fast-paced environment.

Practice Areas

Mixon Tax Law handles cases involving many tax-related issues including:

Mixon Tax Law, PLLC is a boutique tax law firm dedicated to helping individuals and businesses involved in disputes with governmental taxing authorities at the federal, state, and local levels.
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