Use tax is a leading source of audit exposure for manufacturers and distributors, and it remains among the least systematically managed tax obligations. Here's why it accumulates even when finance teams are paying attention.
What You'll Learn
- Why use tax liability accumulates even when finance teams are paying attention
- The five process gaps that lead to underpayment and audit exposure
- How the problem compounds as companies expand across states
- What effective use tax compliance looks like in practice
Most companies understand their sales tax obligations, but use tax is often overlooked. Use tax applies when a business purchases taxable goods or services without paying sales tax at the point of purchase. This happens in ordinary B2B transactions every day. A manufacturer sources equipment from an out-of-state vendor. A distributor buys raw materials from a supplier that is not registered to collect sales tax in the buyer's state. The invoice arrives with no tax line, and the obligation to self-assess and remit that tax now falls entirely on the buyer.
This process is known as use tax self-assessment. Most companies struggle with it, not due to neglect, but because the process is more complex than it appears. Use tax compliance is typically manual, often goes unnoticed until an audit, and is difficult to manage consistently at scale without proper systems. Here is where it breaks down.
1. Use Tax Has No Invoice Line
Sales tax is visible as a line item on vendor bills, making payment automatic. Use tax, by contrast, is not. When a vendor does not charge sales tax, there is no alert or system prompt to indicate a potential use tax obligation. The accounts payable team processes the invoice, and the liability remains unrecorded.
This is the core structural issue with use tax compliance. Because it is self-reported, payment occurs only when someone identifies and addresses the obligation. Without a process to review each purchase against current taxability rules, reviews are inconsistent or absent.
Key point: Vendors not registered in your state will not charge sales tax. In these cases, the compliance obligation automatically shifts to you.
2. Taxability Rules Vary Significantly by State
Even companies with a review process in place face a harder problem: determining whether a specific purchase is actually taxable in a specific state. The same item can carry a completely different tax treatment depending on where the buyer is located. Equipment used in manufacturing may be exempt in Texas and taxable in Ohio. Software may be taxable in one state based on how it is delivered and exempt in another based on how it is used.
Multi-state companies encounter this challenge at scale. A business purchasing from 150 vendors across 12 states must make hundreds of taxability determinations each month. Manual processes cannot deliver the necessary accuracy and consistency without systematic support.
Most companies follow one of two approaches: applying conservative assumptions and taxing all purchases, which leads to overpayment and missed exemptions, or applying broad exemptions and underreporting, which increases audit risk. Both approaches have significant costs.
3. ERP Systems Are Used for Sales Tax, Frequently Ignored for Use Tax
Most companies use technology designed for accounts receivable to manage tax compliance. ERP systems calculate and collect sales tax on sales, while accounts payable receive far less systematic support.
Use tax accrual requires a separate process: extracting AP transaction data, reviewing each purchase by state taxability rules, identifying vendors that did not charge tax, calculating the owed amount, and documenting the accrual. In most organizations, a tax analyst completes this manually in spreadsheets at month-end.
This process relies on individual expertise, does not scale with transaction volume, lacks a consistent audit trail beyond spreadsheets, and operates retrospectively, allowing errors to accumulate over time.
Watch for this: Auditors often identify spreadsheet-based use tax accruals first. These signal manual processes with gaps, which frequently lead to assessments.
4. Errors Are Silent Until an Audit
Sales tax errors generate feedback. Customers may dispute charges, and filing systems flag mismatches, creating a correction loop that surfaces issues before they escalate. Use tax errors often go unnoticed. If a company underreports, the state does not send a notification, and there is no automatic reconciliation.
The only feedback typically comes from a state audit, which may occur years after the initial underpayment. As a result, companies often discover significant use tax liability only when an auditor reviews accounts payable records. The exposure accumulates over time, and without proactive systems, there is no prompt for correction.
Not Sure What Your Use Tax Exposure Looks Like?
AUTOSOLV reviews every AP transaction against current state taxability rules automatically.
What Effective Use Tax Compliance Looks Like
Increasing headcount is not the solution. At the transaction volumes typical for mid-market manufacturers and distributors, manual review cannot keep pace. Effective use tax compliance requires automation at the AP transaction level.
A well-designed use tax process does four things consistently:
- Reviews every AP transaction against current taxability rules for each relevant state
- Flags purchases where sales tax was not charged but use tax may be owed
- Calculates the correct accrual and books it with a documented, audit-ready trail
- Updates automatically as taxability rules change across states
When this process is consistent, use tax accrual becomes a systematic, auditable function rather than a spreadsheet exercise. Companies that adopt this approach reduce audit exposure, eliminate manual gaps that lead to assessments, and gain visibility into their use tax liability before an audit occurs.
Stop Guessing on Use Tax
AUTOSOLV automates AP transaction review, taxability determinations, and accrual documentation across every state where you do business.
Frequently Asked Questions
What is use tax self-assessment?
Use tax self-assessment is the process of identifying, calculating, and remitting use tax on purchases where the vendor did not charge sales tax. It is a legal obligation in most states for businesses that buy taxable goods or services from sellers that are not registered to collect tax in the buyer's state.
Why do companies underpay use tax?
Underpayment typically traces back to a lack of systematic review at the accounts payable level. Because vendors do not bill for use tax, the obligation only gets met if someone actively identifies it. Manual processes miss transactions, apply inconsistent taxability rules, and produce no reliable audit trail.
What does a state auditor look for in a use tax audit?
Auditors typically start with accounts payable records, looking for purchases from out-of-state vendors where no sales tax was charged. They then test whether those purchases were taxable and whether the company accrued and remitted use tax on them. Spreadsheet-based accrual processes with gaps or inconsistencies are a common source of assessments.
What is the penalty exposure for use tax underpayment?
Penalty structures vary by state, but most assess interest on the underpaid amount from the date it was due. Additional penalties for negligence or substantial underpayment can reach 25% or more of the unpaid tax in some jurisdictions. Multi-year exposure across multiple states can make the total assessment significant.
Can automation fix use tax self-assessment problems?
Yes. Use tax automation platforms review AP transactions against current taxability rules, calculate the correct accrual, and generate a documented audit trail without manual intervention. This replaces a process that is inherently inconsistent when done by hand with one that is systematic and defensible.
