From Assumption to “Fact”: How Sales Tax Myths Start 

Sales tax professionals have always had to distinguish dependable guidance from convenient explanations. What has changed is how quickly an incomplete answer can travel and how polished it can appear by the time it reaches you.  

A sales tax assumption can start with a coworker, gain support through an email or social media post, and eventually be repeated as fact. Technology can speed up that transformation by summarizing and circulating information before anyone stops to check the original source. 

The good news is that there are ways to determine a claim’s reliability, and the more you investigate the details behind an answer, the better prepared you become to separate fact from fiction. On November 30, 2026, Diane Yetter and Trisha Davidson will put that idea into practice during The Truth About Sales Tax: Debunking 10 Common Myths webinar, where they’ll challenge familiar assumptions and explain the facts behind common sales tax misconceptions. 

To understand why these myths can be so convincing, it helps to start where many of them begin: with the people and conversations we already trust. 

When People Pass Along Partial Truths 

Imagine a company that sells prewritten software and cloud-based subscriptions. During a planning meeting, a coworker mentions an upcoming change in California and says, “California is going to start taxing digital products.” The statement contains part of the truth, but it leaves out the details that determine what the change means for the company.  

Later, another employee repeats the update in an email: “California will tax anything delivered digitally.” The explanation is easier to remember, but it is also less accurate, as there are exclusions this convenient summary is leaving out. A third employee finds a social media post announcing that “California is taxing SaaS” and shares it as confirmation. By the time the information reaches the tax department, a qualified statement about certain digital products and software has become a sweeping conclusion: California taxes all digital products and SaaS. 

Workplace dynamics can also make that conclusion difficult to question. A newer employee may hesitate to challenge an experienced coworker, particularly when the explanation appears to be supported by an email and a social media post. An experienced professional may accept the statement because it reflects a broader trend of states reconsidering how software and digital offerings are taxed. 

This is how a partial truth becomes a sales tax myth. No one necessarily intended to communicate something false. One person summarized a complicated change too broadly, another shortened the explanation, and a third found a confident statement that appeared to confirm it. Each retelling removed another qualification until the exception became the supposed rule. 

A sales tax myth does not need to begin as a lie. Sometimes, it is simply a true statement repeated without the conditions that made it true. 

When a Summary Replaces the Source 

After hearing that California may tax digital products, an employee decides to verify the claim. A quick search returns an AI-generated overview stating that California is expanding its definition of tangible personal property to include digital products and software. The answer appears clear, current, and specific enough to share. 

The employee stops there. 

What’s missing is the longer source behind the summary. That source explains which products are covered, which remain excluded, and how the proposed treatment distinguishes prewritten software from custom software and certain services involving human effort. The summary captured the headline, but not every qualification needed to apply the information correctly. 

The same problem can occur closer to home. Imagine that same employee subscribes to a sales tax newsletter covering the California development. The newsletter contains several articles, including a detailed analysis of the affected products, exclusions, effective date, and questions that remain unresolved. Instead of opening the newsletter, the person reads an AI-generated email recap that says, “California will tax digital products, including SaaS.” 

Nothing about that sentence immediately signals that information is missing, in fact, it validates everything else they’ve seen and heard in relation to this change. Yet the recap may have merged the newsletter’s headline with details from another article, omitted an important exclusion, or treated a proposal as though it were already in effect.  

This is the risk of allowing a summary to replace its source. A summary is designed to reduce information, but sales tax decisions often turn on the information most likely to be removed, like the status of the change, scope of the rule, exclusions and impacted jurisdictions, as well as effective dates. 

AI-generated summaries can be useful for identifying a subject that needs attention, organizing a crowded inbox, or helping a reader decide which source to open first. They should not be treated as the support for a tax position. 

Where to Check the Facts 

Coworkers, professional communities, and even AI tools can alert you to a sales tax development worth investigating, but they should not have the final word. When you encounter a broad statement like “California taxes digital products,” resist the urge to immediately decide whether it is true or false. Instead, break the claim apart and determine exactly what you need to verify. 

Start your investigation by asking: 

• What exactly is changing? 

• Who and what does it apply to, and are there exceptions? 

• Which jurisdiction applies, and when does the change take effect? 

• What is the authority behind the claim? 

• How does it apply to your specific facts? 

Those questions turn “I heard California taxes digital products” into something much more useful: “What changed in California, what does the change cover, and does it apply to this transaction?” 

Then you need sources capable of answering those questions. No single resource will necessarily provide the entire answer, so think of research as moving from authority to interpretation. 

Where to look: 

• State tax and legislative sources. Start as close to the law as possible. Look to the applicable taxing authority for published guidance and to the state legislature when researching legislation. 

• Your tax department or tax advisor. Experienced tax professionals can help interpret the authority against your company’s specific transaction and facts. 

• Respected sales tax organizations. Organizations such as the Council on State Taxation and Streamlined Sales Tax can provide additional explanations and resources. The Sales Tax Institute also offers a library of charts and helpful assets. 

• Established tax research services. Professional tax research platforms can provide additional reporting, analysis, and access to supporting materials when a question requires deeper research. 

• Industry resources. Trade associations and other industry-specific sources can help explain how a development affects a particular type of business or transaction, but that context should still be checked against the applicable authority. 

The closer you get to the original authority, the stronger your foundation becomes. Other resources can help you understand and apply that authority, but the goal should always be to trace an interpretation back to the underlying rule. An invoice, headline, AI summary, or confident explanation may be evidence that you have a question worth investigating, but it is not necessarily the authority that answers it. That distinction between evidence and authority is also reflected in the earlier fee discussion, where state law and the substance of the transaction control rather than invoice presentation alone.

Cutting Through the Fog 

The goal with separating sales tax fact from fiction is not to distrust every coworker, article, or technology tool. It is to recognize when an answer needs more context before it becomes the basis for a tax decision. 

The more often you trace a claim back to its source, the easier it becomes to spot missing exceptions, outdated information, and assumptions presented as universal rules. The fog may never disappear completely, but you can build the habits and use the resources needed to find a clearer, more defensible answer. That focus on current, credible information supports professionals at every experience level, from those building confidence to those expected to guide complex decisions. 

Are you ready to separate sales tax fact from fiction? Register now for The Truth About Sales Tax: Debunking 10 Common Myths webinar on November 30, 2026, and hear the truth directly from experienced instructors Diane Yetter and Trisha Davidson. They’ll explain why common misconceptions persist and share the facts you need to approach sales tax decisions with greater confidence.