Welcome to The Sales Tax Sisters sales tax website

We help you understand sales & use tax.

The Sales Tax Sisters help people understand sales and use tax concepts.  Sales & use tax might be complicated but it doesn’t have to be overwhelming.

We’re here to help you understand how sales & use tax works so you can get it right.

With over 40 years collective experience as certified public accountants, we teach you about the basic framework of sales & use tax and offer guidance on exactly how it applies to your business.

The Sales Tax Sisters will help you understand:
  • How to establish if something is taxable or not
  • What you need to do, and when you need to do it, to ensure compliance
  • When and how to register,  and in what jurisdictions
  • How to file your return
  • How to substantiate tax-free sales
  • Which rates of tax apply


What we do & how you can work with us

We’re passionate about teaching people the fundamentals of sales tax & use tax compliance. 

In addition to educating you on how to get the framework right,  we will support you as much or as little as you need.  We’ll pitch in and work alongside you or perform the analysis for you.

If you’re wondering whether you need to be registered for sales tax, we can teach you to do the analysis or issue you a report.

If you’re questioning whether a transaction or series of transactions is taxable, we can research the specifics that apply to you.

You tell us what you need and we’re more than happy to help out.

Our aim is to demystify the sales & use tax landscape so you feel comfortable, confident and armed with the knowledge you need.


Why Trust The Sales Tax Sisters?

40 Years of Experience

Together, we have more than 40 years experience as Certified Public Accountants, who focus on the application of sales & use tax rules.

Customized Expertise

We energetically empower small business operators with knowledge and expertise, and customize our service to suit your needs.

We Deliver

When we work with you, we’re dedicated to you. We’re here to give you peace of mind that your business is compliant, and we’re available if you need us.

Our Vision and Mission

Meet The Sales Tax Sisters

When you work with the Sales Tax Sisters, you work with with one or both of us, and, together, we work to ensure you receive high quality, customized service.  We try to make sure that people understand sales and use tax, how it impacts their business and how to comply with the rules.

Mary Thomas at The Sales Tax Sisters

Mary C. Thomas, Attorney-CPA

I’m the type of person who likes to solve a good puzzle. I’ve always had a passion for pulling things apart and putting them back together, which means the nuances of sales and use tax is right up my alley.

There’s something rewarding in being able to take a situation, break it down and make it simple so people can understand what’s going on.

I’ve employed that approach as part of a lengthy career as both a Certified Public Accountant and an attorney.

The reality is, most people find out about their sales & use tax responsibilities at the worst possible time– during an audit.

I love empowering people so they understand exactly what they need to do, and can rest easy in the knowledge that they understand sales & use tax and are doing it right.

Stephanie Thomas at The Sales Tax Sisters helps with sales tax questions and concerns.

Stephanie M. Thomas, CPA

As a Certified Public Accountant, I understand all too well that sales and use tax seems complicated.

As a small business owner, I also appreciate it might slip to the bottom of the long list of tasks that business operators and their staff juggle each day.

That’s why I’m passionate about providing business owners with the peace of mind that what they are doing is correct and compliant.

I focus on making sure you understand what you need to do, so you can feel confident in meeting sales & use tax requirements, whether you choose to outsource or file your returns yourself.

Small business owners don’t have endless time or cash resources at their disposal, but I’m here give you the knowledge and insight you need to efficiently and effectively meet your sales & use tax requirements.

What Others Say

I know that I can always count on Stephanie and Mary to provide professional, accurate, timely and efficient analysis of our company’s tax needs.   Their knowledge and understanding of the tax laws and their willingness to go above and beyond are greatly appreciated.   Thanks for the great service!!

Deborah Grassity at Innovex Downhole Solutions, Inc.

  Undergoing a sales tax audit can be extremely overwhelming and intimidating.   The first call with Stephanie Thomas put me completely at ease.  Stephanie demonstrated subject matter expertise with a gift for communication.  With the help of Stephanie I had a clear direction of how to approach the audit and received consistent follow up with tasks required from each of us. 

Edgar Sanchez at Modern Method Gunite, Inc.

Taxes always seemed daunting.  However, I was given the task of working with sales tax for a green field operation.  Shamefully, I dreaded the process and wasn’t looking forward to my ‘Intro to Sales Tax’ with Mary Thomas’ Company.  As soon as met Mary, I knew I had found not only a thorough and patient teacher, but an expert in her field. 

Stephanie Bryars at RavenChem

Opening up a small business is much more difficult than it appears on any Hallmark Channel movie. There are so many moving parts: payroll, insurance, rent, etc. For questions about sales tax, a friend recommended Mary Thomas. She answered all my questions…and repeated those answers in a very courteous and knowledgeable way. You will definitely feel more confident and empowered after making her part of your team.

Sam Malone at 512 New Media

Prior to our commencement of working in Texas we searched many firms looking for the right fit.  The minute we started talking to Mary we knew we would have a lasting relationship.  She knows her business. The methodical approach in teaching and explaining the rules governing sales and use tax is upbeat and comprehensible, especially for a firm doing business for the first time in Texas. 

Lori Potokor at Midway Enterprises, Inc.

Reach Us


13121 Louetta Rd. #1515 
Cypress, TX 77429





Contact The Sales Tax Sisters