Indiana Department of Revenue Sales Tax Audit Protest

The situation

Brad, 48, owns Hoosier Precision Plastics Inc., an Indianapolis-area injection molding manufacturer (18 employees, $3.7M revenue) producing custom plastic components for medical device OEMs. In February 2026 Brad received an Indiana Department of Revenue Proposed Assessment: "Sales and Use Tax: $52,300 (plus $7,845 penalty + $4,184 interest = $64,329 total), audit period: January 2023 – December 2025."

The IN DOR auditor assessed $52,300 in use tax on equipment Brad purchased from out-of-state vendors: (1) $28,600 on injection molding machines and mold tooling; (2) $11,400 on material handling robots (6-axis robots that load raw plastic pellets into the machines and remove finished parts from the mold); (3) $7,200 on quality control vision inspection systems; (4) $5,100 on industrial chillers (cooling water systems that maintain mold temperature during injection molding).

Brad has 60 days from the Proposed Assessment date to file a protest via INTIME.

(a) His injection molding machines and mold tooling are almost certainly fully exempt. Under IC 6-2.5-5-3(b), injection molding machines directly cause the physical transformation of plastic pellets into finished components, they are the archetypal "directly causes a physical change" equipment. The mold tooling (the steel molds mounted in the machines) causes the specific shape transformation, also directly causes a physical change. These should be fully exempt.

(b) The material handling robots are the most contestable category. Indiana's "double direct" test creates ambiguity for loading/unloading robots. The argument FOR exemption: the loading robot puts plastic pellets into the machine, it is "directly used in production" as the last step before the machine performs the physical change. The argument AGAINST: the robot moves material TO the machine but doesn't itself cause the physical change. Indiana Tax Court cases have gone both ways on loading/unloading equipment. Brad needs to argue that his loading robots are "integral to the integrated production process" under the Mynsberge standard.

(c) The quality control vision systems and industrial chillers require specific analysis. QC vision systems that test finished parts after molding probably don't "directly cause a physical change" to the product, Brad should concede these. But the industrial chillers actively control the mold temperature DURING the injection process, a temperature change in the mold IS a direct physical variable affecting the plastic part's formation. This is a colorable exemption argument under the physical change prong.

(d) Agile Consulting quoted Brad $6,000 for Indiana manufacturing exemption analysis and protest preparation. The 'double direct' test analysis, which items pass both prongs, which fail the second prong, which are contestable, is a structured equipment-by-equipment analysis that Brad can largely build himself with the right Indiana-specific legal framework.

Sarah may have been collecting tax incorrectly (collecting it herself when her clients should have been self-reporting use tax, or vice versa). The audit's classification of her resale activity is what needs analysis.

Who receives this

Indiana manufacturers, technology companies, and retailers receiving IN DOR sales and use tax Proposed Assessments. Primary segments: (1) Indiana manufacturers, automotive components (Subaru, Toyota, Stellantis supply chains), medical devices, plastics, precision machining, disputing manufacturing equipment exemption under the "double direct" test. Secondary: Indiana construction contractors and agricultural equipment businesses.

Why the agency will not advise you

IN DOR cannot advise audit respondents on how to contest its own Proposed Assessments. INTIME provides protest SUBMISSION without strategy. Sales Tax Helper LLC and Agile Consulting confirm professional services market ($3,000–$10,000) without a self-serve alternative. The Indiana Tax Court's genuine independence (statutory court in the judicial branch) means there is a real second-stage venue if the DOR doesn't reverse. The "double direct" test's complexity, which equipment passes both prongs vs. fails the second prong, is the specific structured analysis the tool enables.

Key facts, with sources

• Indiana's manufacturing exemption under IC 6-2.5-5-3(b) is called the 'double direct' test, the exemption applies to equipment that is (1) directly used in production AND (2) directly causes a physical change in the property being manufactured. The Indiana Tax Court (the independent statutory court with jurisdiction over tax appeals in Indiana) has developed a two-pronged analysis in cases including Mynsberge v. Indiana Dept. of Revenue: (1) 'Directly in production' means the equipment must be an integral part of the integrated process of production, it cannot be merely incidental, auxiliary, or supportive. (2) 'Directly causes a physical change' is the more restrictive second prong: the equipment must itself cause the physical transformation of the raw materials into finished goods. Material handling equipment that merely moves raw materials to the machine (but the machine itself causes the physical change) has been found to NOT directly cause a physical change. Quality control equipment that tests the product (but doesn't itself transform it) similarly fails the 'directly causes physical change' prong in many Indiana decisions. This 'double direct' test is notably more restrictive than Michigan's (single 'industrial processing' standard), Wisconsin's ('exclusively and directly'), Minnesota's and Maryland's ('directly and predominantly'), and is the most litigated manufacturing exemption standard in Indiana Tax Court. Source: Indiana Sales Tax Defense — Sales Tax Helper LLC · Indiana Sales Tax Exemption for Manufacturing — Agile Consulting · Indiana Tax Court: The Basics About Indiana Tax Cases — Camden & Meridew
• When the Indiana Department of Revenue issues a Proposed Assessment, the taxpayer has 60 days from the date on the proposed assessment to file a written protest with IN DOR. Protests may be filed electronically through INTIME by logging into the taxpayer's account and selecting 'Submit Protest Documentation.' IN DOR then reviews the protest and issues a Final Determination. If the taxpayer disagrees with the Final Determination, they may appeal to the Indiana Tax Court within 90 days of the Final Determination. The Indiana Tax Court (Ind. Code § 33-26-2) is a separate statutory court within Indiana's judicial branch, it is NOT part of the executive branch or the Indiana Department of Revenue. The Indiana Tax Court has exclusive jurisdiction over cases arising under Indiana tax law and its decisions are appealable to the Indiana Supreme Court. IN DOR publishes an Audit Manual (revised 2024) describing the audit process including the 'double direct' test for manufacturing equipment. Source: DOR: Appeals — Indiana Department of Revenue · Indiana Department of Revenue Revised 2024 Audit Manual · Indiana Tax Developments: Fall 2025 — US Tax Disputes

When to bring in a professional

Self-serve responses fit routine cases: clear facts, amounts a business can absorb, and a deadline still ahead of you. Bring in a licensed professional when the amount at stake is large relative to their fee, the facts are genuinely disputed, criminal exposure is possible, or the deadline has already passed. A short paid consultation to sanity-check your plan is often worth it even when you handle the filing yourself.

All sources for this guide

1. Indiana Sales Tax Defense — Sales Tax Helper LLC
2. Indiana Sales Tax Exemption for Manufacturing — Agile Consulting
3. Indiana Tax Court: The Basics About Indiana Tax Cases — Camden & Meridew
4. DOR: Appeals — Indiana Department of Revenue
5. Indiana Department of Revenue Revised 2024 Audit Manual
6. Indiana Tax Developments: Fall 2025 — US Tax Disputes