Managing Sales & Use Tax Exposure in Construction: Practical Frameworks and Best Practices

For an overview of the foundational concepts, risks, and common misconceptions surrounding sales and use tax exposure, read Sales and Use Tax in Construction: An Overlooked Source of Financial Risk.

In Part 1 of our series, we explored why sales and use tax is one of the most commonly overlooked, and often misunderstood, areas of tax compliance for construction companies. Understanding common sales and use tax risks, however, is only the first step in managing one’s tax exposure. Construction firms must also translate that knowledge into frameworks and processes that project managers, contract writers, procurement teams, and tax professionals can apply before a project begins. 

Most sales and use tax exposure can be prevented long before construction firms issue their first invoice. The key to limiting exposure is evaluating every project through a series of structured decision points: from classifying the work and structuring the contract to assessing exemptions, navigating state-specific rules, and involving tax from the project’s outset.

The following frameworks reflect BDO’s practical approach to helping construction clients understand and incorporate sales and use tax considerations and savings into every stage of the project lifecycle.

Apply the Three-Prong Test for Determining Real or Tangible Personal Property

Most sales and use tax decisions typically hinge on whether the project is improving real property, such as land and anything permanently affixed to it, or tangible personal property, which includes movable items that are not permanently attached to land or structures. 

The distinction drives many downstream tax consequences as different classifications can change who is considered the end user, whether exemptions apply, how materials are purchased, and whether tax should ultimately be collected from the customer. Because states often apply different standards, misclassification at the outset can create a cascade of errors throughout the project. Applying the following three-prong test can provide a practical framework for determining whether property should be treated as real property or tangible personal property.

The Three-Prong Test

Before drafting contracts or purchasing materials, contractors should evaluate the following: 

If all three conditions are met, the project is generally treated as real property. If not, the project is considered tangible personal property under most tax circumstances.

This assessment creates a consistent method for determining how the project should be treated before contract negotiations begin. However, certain elements — like lease clauses, regulatory requirements, and component-level analysis — can alter these classifications in unanticipated ways. Contractors should monitor any special conditions in addition to this three-prong test on a case-by-case basis accordingly. 

Build the Right Contract From the Start

While many contractors assume tax outcomes are determined by the project itself, in reality, contract structure is often one of the largest drivers of tax treatment. It can determine who pays tax, whether exemptions can be claimed, and whether materials can be purchased for resale. Modeling and analyzing the sales and use tax implications at the contract stage can also help prevent unintended consequences.

Before finalizing a contract, contractors should ask:

• What type of contract is this?
• What is the scope of work?
• What is being transferred?
• Who is purchasing the materials?
• Is there an agency relationship?
• Does the customer qualify for an exemption?
• Is there a tax clause?
• Do the documents match?

Addressing these questions before work begins can help clarify potential tax implications, support documentation requirements, and reduce the risk of costly surprises later in the project lifecycle.

Protect Available Exemptions Before the First Purchase Order

One of the most common misconceptions in the construction industry is that working for an exempt customer automatically makes a project exempt — but that is often not the case. Whether an exemption flows through to the contractor depends on state rules, contract structure, documentation requirements, and organization type. Missing these requirements can eliminate exemptions that would otherwise have been available.

Reassess Your Tax Strategy for Every State

Home-state rules do not travel. One of the most common audit issues BDO sees is contractors applying rules they know from one state to a job in another. Before entering a new state, contractors need to assess nexus and registration, contract-type recognition, exemption eligibility, local tax rates, and materials sourcing logistics. A process that applies in one state may create unexpected tax liabilities in another. 

Performing a state readiness assessment can help contractors identify how local rules may affect their registration obligations, contract structures, exemption eligibility, purchasing processes, and overall tax exposure.

State Readiness Assessment

Bring Tax Into the Project From Day One

The root cause of most sales and use tax compliance failures is not a lack of knowledge, but rather, a communication breakdown between the tax team, contract writers, and project managers. To most effectively support compliance and avoid unintended liabilities, the tax function must be involved as early as the contract scoping stage. By the time a purchase order goes out, most of the decisions that determine tax exposure have already been made. A pre-contract review process, centralized documentation tracking, and basic training for non-tax staff can provide the internal controls needed to apply these frameworks consistently across projects. 

Putting the Frameworks Into Practice

These frameworks are not meant to be applied independently. Rather, they are designed to work together and help organizations build proactive sales and use tax management practices that protect margins, capture available exemptions, and produce audit-ready documentation before an audit ever occurs.

We can help construction companies evaluate sales and use tax exposure before a project begins as well as build repeatable processes for managing it throughout the project lifecycle. Our professionals have deep experience assisting with project and property classification,  exemption analysis, multistate readiness assessments, documentation requirements, purchasing workflows, and internal controls designed to support consistent compliance. By involving tax earlier, contractors can not only better protect available exemptions, but also help reduce the risk of unexpected liabilities and create audit-ready documentation before issues