Sales Tax Litigation Attorneys

Sales Tax Audits and Their Impact Across Industries

Sales tax audits play a crucial role in state revenue enforcement, but they can create substantial administrative and financial challenges for businesses—particularly those operating in complex or high-transaction industries. In the construction industry, audits often focus on the proper classification of labor and materials, the use of exemption certificates, and the distinction between real property improvements and taxable retail transactions. Contractors working across multiple states face heightened exposure as states increasingly assert nexus based on economic activity rather than physical presence. Missteps in purchasing materials tax-free or misapplying resale exemptions can result in significant assessments, penalties, and disputes over document sufficiency.

The automobile sales industry is another frequent audit target due to high-dollar transactions, trade-in credits, rebate treatment, and interstate sales. States scrutinize whether dealerships properly document out-of-state deliveries, apply the correct tax rate for location-based sourcing, and maintain sufficient proof for exempt or wholesale transactions. Even minor documentation gaps can lead to large liabilities given the value of motor vehicle sales.

As businesses expand across state lines, multistate nexus issues have become central to sales tax compliance. Following the U.S. Supreme Court’s Wayfair decision, states have aggressively adopted economic nexus standards based on sales volume or transaction counts. Companies operating remotely, including contractors, auto dealers with online operations, and suppliers, may unknowingly trigger filing requirements in multiple states. An audit in one jurisdiction often leads to inquiries from others, amplifying risk and administrative burdens.

To mitigate these exposures, many taxpayers seek sales tax voluntary disclosures (VDA). VDAs allow businesses to come forward proactively, limit lookback periods, reduce or eliminate penalties, and resolve unpaid liabilities before an audit begins. This is particularly valuable for companies with multistate nexus concerns or newly discovered compliance gaps. By securing formal agreements with states, businesses can start fresh and avoid the harsher consequences of an enforced audit.

When disputes arise, the appeals process becomes critical. In Texas, taxpayers undergoing a sales and use tax audit may challenge audit findings through an Administrative Hearings process with the Comptroller. The process typically includes an exit conference, an informal review, and then a formal hearing before the State Office of Administrative Hearings (SOAH). Taxpayers present evidence, legal arguments, and documentation to contest the assessment. After SOAH issues a proposal for decision, the Comptroller adopts a final ruling, which may then be appealed to district court.

In Illinois, taxpayers disputing sales tax assessments can bring their cases before the Illinois Independent Tax Tribunal, the state’s forum for resolving tax controversies involving more than $15,000 in dispute. The Tribunal operates similarly to a court, allowing discovery, motions practice, evidentiary hearings, and formal judicial-style proceedings before an administrative law judge. This independent structure provides taxpayers a neutral venue to address audit disagreements outside of the Department of Revenue itself.

Across industries and jurisdictions, sales tax audits represent a complex intersection of law, documentation, and business practice. Companies that understand their obligations, proactively manage nexus exposure, and make strategic use of voluntary disclosures and appeals processes are best positioned to minimize risk and maintain compliance in an evolving tax landscape.