“Personal relationships with clients is what sets us apart. We like to work one on one with our clients to analyze their unique operating environments and customize the best strategic plans.”

Why choose us

Since 1994, we serve clients ranging in size from Fortune 500 companies to local businesses and non-profits. We believe that ongoing client communication and partner availability is essential to providing high-quality, high-value professional services. From inception to dissolution, we walk side by side with our clients, expertly navigating the rapidly evolving environment they face today.

Mitzi E. Sullivan CPA, PLLC | Firm ManagerAbout the Owner

Mitzi Sullivan, CPA

Bachelor’s in Accounting at UTA
QuickBooks ProAdvisor

As the owner and manager of the Mitzi E. Sullivan CPA, PLLC, Mitzi oversees all departments and focuses on strategic and financial business planning for every client.

Mitzi started her professional career at Ernst & Young as an auditor, primarily in oil and gas. She has over 30 years of experience as a CPA serving clients in numerous industries including real estate, professional services, construction, manufacturing, and retail. As an entrepreneur, Mitzi has a passion for business and takes pride in helping clients strategize for success.

Our Team

Nick Grantham

Tax Manager
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Gabriela Vargas

Staff Accountant
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Heather Swan

Staff Accountant
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Stacey Hanna

Business Service Associate
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Jessica Sullivan

Business And Accounting Service Manager
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Marsha Farmer

Administrative Assistant
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Mitzi E. Sullivan CPA, PLLC is proud to call Decatur, Texas home. We also offer virtual services to clients nationwide.

There’s a better way. Let’s find it!

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     Excellent  
     Based on 22 reviews 
    
 
 
   
 
 
        
   Gregory Auen 
 2023-08-29
 
 
 Trustindex verifies that the original source of the review is Google. Great experience with Mitzi and her Team. Responsive, attentive and insightful. Maybe best trait is no b.s. Sound guidance, no shenanigans.
  
 
       
   Dustin Hachtel 
 2023-08-28
 
 
 Trustindex verifies that the original source of the review is Google. In the first few years of business, I struggled with the accounting and tax filings. I went through multiple CPA's trying to find someone that could help with the scenario of business I operate. Mitzi and her staff have helped me out tremendously. I will always recommend them.
  
 
       
   Tomie Fox 
 2023-06-06
 
 
 Trustindex verifies that the original source of the review is Google. Mitzi and her staff are amazingly friendly and are always available to talk when I have questions. I recommend them to anyone looking for professional accounting services. Mitzi E. Sullivan CPA is the best in Decatur and Wise County.
  
 
       
   Debbie Newberry 
 2023-05-11
 
 
 Trustindex verifies that the original source of the review is Google. We have used Mitzi Sullivan’s office for full accounting services for our business the past two years - bookkeeping, payroll and taxes. The office is easy to work with; very responsive, knowledgeable, and friendly. They came highly recommended to us, and we highly recommend them as well!
  
 
       
   Nancy Sorrells 
 2023-03-31
 
 
 Trustindex verifies that the original source of the review is Google. The team is very friendly and helpful.   They are informed and able to give valuable information to their clients.
  
 
       
   Joseph Sullivan 
 2023-03-24
 
 
 Trustindex verifies that the original source of the review is Google. She has taken care of my books and taxes ever since I can remember. I have a construction business and she's helped me keep Quickbooks clean and has made sure I'm squared away on the tax side.
  
 
       
   Draco RueSeleneLeeloo 
 2023-03-13
 
 
 Trustindex verifies that the original source of the review is Google. This firm does an incredible job keeping our books straight and gives us peace of mind.  Definitely recommend to anyone needing accounting services.
  
 
       
   Jaci Christian 
 2022-12-15
 
 
 Trustindex verifies that the original source of the review is Google. We struggled for years to get good CPA advice and someone to help us strategize in our business! Every time we leave a meeting with Mitzi and her team we are BLOWN away! We leave prepped, with a plan and tax numbers moving into the next year. Their knowledge is next level. We have finally found our CPA/Tax Solution and are incredibly grateful they are right here in our home town.