Use tax exposure accumulates silently in accounts payable. Manual review processes miss too much — and auditors know it. Here's how automation closes the gap.
What You'll Learn
- What use tax is and why it falls on the buyer rather than the vendor
- How use tax exposure accumulates silently in accounts payable
- The AP transaction types that generate the most use tax liability
- How automated use tax accrual software reviews AP and identifies untaxed purchases
- How use tax automation integrates with your existing ERP and AP systems
- How to approach a use tax exposure review before an auditor does it for you
Core issue: AP processes are designed to verify invoices and process payments. Tax compliance is typically not integrated into standard AP workflows — which means use tax exposure accumulates until an auditor reviews your records and determines the amount owed.
Does this apply to your company?
You likely have use tax exposure if any of these are true.
- You regularly buy from out-of-state vendors
- You use online purchasing channels or procurement platforms
- You buy SaaS or digital services from vendors without nexus in your state
- Your AP team does not have a systematic use tax review step
- You have not had a use tax assessment in the past three years
Related resources
Most accounts payable teams focus on paying vendor invoices accurately and on time. But AP is also responsible for managing one of the most frequently overlooked tax obligations in B2B finance: use tax.
Use tax is owed whenever you purchase taxable goods or services without paying sales tax at the point of purchase. It applies most commonly to out-of-state vendor purchases, online orders from vendors without nexus in your state, and purchases where the vendor simply didn't charge tax. The obligation to identify, calculate, and remit use tax falls entirely on the buyer — the AP team and the finance organization behind it.
Many companies miss a significant portion of their use tax obligations — not due to intentional avoidance, but because manual AP processes lack a systematic method for identifying them. State auditors are aware of this and often prioritize use tax exposure during audits.
Use Tax vs. Sales Tax: Why AP Owns This Problem
Sales tax and use tax are two sides of the same obligation, applying to the same taxable transactions. The difference is only in who collects and remits.
Collected by the vendor
The vendor charges sales tax at the point of sale and remits it to the state on the buyer's behalf. When a vendor with nexus in your state charges sales tax, the buyer's obligation is fully satisfied at purchase.
Who remits: The vendor, on behalf of the buyer.
Self-assessed by the buyer
When a vendor does not collect sales tax — because it lacks nexus or simply omits it — the buyer owes use tax directly to the state. No invoice, no notice, no reminder. The buyer must identify, calculate, and remit on its own.
Who remits: The buyer — typically through accounts payable.
Why vendors don't always charge sales tax
A vendor is required to collect sales tax only in states where it has nexus — a qualifying connection through physical presence, employees, inventory, or economic activity exceeding that state's threshold. A vendor without nexus in your state has no legal obligation to collect, and often won't.
This creates a predictable compliance gap. Each purchase from an out-of-state vendor without nexus, an online marketplace that doesn't collect for your jurisdiction, or a vendor that omits tax due to oversight generates a potential use tax obligation. The responsibility does not disappear if the vendor doesn't charge — it transfers to the buyer.
Why AP teams miss it: High invoice volume compounds the problem. A mid-size company processing hundreds or thousands of invoices monthly cannot manually review each one for use tax exposure. Without a dedicated step to flag untaxed taxable purchases, these transactions go unnoticed and exposure accumulates over time.
The AP Transaction Types with the Highest Use Tax Exposure
Not all AP transactions present the same level of use tax risk. These categories consistently generate the highest exposure.
Large equipment and capital purchases
Equipment purchased from out-of-state vendors represents the highest use tax exposure for most companies. High transaction values mean a single missed accrual can be material. Capital purchases are also often processed outside the standard AP workflow — through direct financing, separate capex systems, or by operations teams without AP involvement — making them especially likely to miss use tax review.
Online and catalog purchases
Purchases from online platforms and catalog vendors without a physical presence in the buyer's state frequently omit sales tax. This is especially common for indirect purchases — office supplies, safety equipment, maintenance materials, small tools — where corporate cards or procurement platforms are used and do not automatically apply use tax logic.
Software, SaaS, and digital services
SaaS subscriptions and digital services from vendors without nexus in the buyer's state create use tax obligations that many AP teams don't recognize. The common focus on physical goods causes finance teams to overlook digital services. In states that tax digital goods and software, each monthly subscription invoice from an out-of-state vendor may carry a use tax obligation.
Freight, shipping, and handling charges
Freight and shipping charges are taxable in many states when the underlying product is taxable. If a vendor charges tax on the product but omits it on freight, the buyer incurs use tax on the shipping cost. These amounts are typically small compared to the product cost — which is precisely why they receive less scrutiny and accumulate unnoticed.
Vendor billing errors
Use tax exposure also arises when a vendor charges less tax than required — billing errors that are easily missed in a high-volume AP environment. The buyer remains liable for the correct tax amount regardless of what the vendor charged.
Exempt purchases used taxably
Use tax is also triggered when purchases made under an exemption certificate are later used for taxable purposes. If a manufacturer buys raw materials under a manufacturing exemption but uses some for non-exempt activities, use tax is due on that portion. This self-assessment is rarely tracked without a systematic process.
How Manual Use Tax Accrual Fails in Practice
In companies without automation, the most common use tax process is a periodic — typically monthly or quarterly — review of AP invoices by a tax team member or external accountant. The failure modes are predictable at every stage.
⚠️ Volume exceeds capacity
A single reviewer cannot thoroughly examine hundreds of invoices each month while managing other responsibilities. In practice, reviews are superficial: large items receive attention, smaller ones are skipped, and entire vendor categories may be overlooked. The volume consistently exceeds what manual review can reliably handle.
⚠️ Inconsistent taxability determinations
Without state-specific taxability rules integrated into the review process, similar purchases may be identified as taxable in one cycle and missed in another — depending on the reviewer and the reference materials used. This inconsistency creates both over-accrual and under-accrual errors across the same AP records.
⚠️ Missed vendor nexus changes
Manual reviewers often lack current information about which vendors have nexus in specific states. A vendor that was out-of-state last year may establish nexus this year by crossing an economic threshold. Without ongoing vendor nexus monitoring, these changes — and their impact on use tax obligations — are frequently missed.
⚠️ Documentation gaps fail audits
When use tax is correctly identified and accrued, the documentation of how the determination was made is often informal — a note in a spreadsheet, an email thread, a flag in the accounting system. During an audit, this documentation is inadequate to demonstrate a systematic compliance process.
The retroactive problem: Manual processes rarely identify use tax obligations that accumulated before the process was implemented. A company starting a use tax accrual process in 2026 may have several years of unaddressed exposure in its AP records — exposure that an auditor will find even if current processes are now functioning correctly.
How Automated Use Tax Accrual Works
Automated use tax accrual software integrates with your AP system and systematically reviews invoices, applying taxability rules and vendor nexus logic to each transaction — continuously, not on a periodic review schedule.
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AP data integration
The system connects to your ERP or AP platform and ingests invoice data including vendor, amount, item description, purchase category, ship-to location, and sales tax status. This integration runs continuously rather than on a monthly or quarterly schedule.
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Vendor nexus assessment
For each vendor, the system assesses whether that vendor has sales tax nexus in the state where the purchase will be used. A vendor with nexus should be collecting tax — if they aren't, that's a vendor management issue as well as a use tax issue. A vendor without nexus creates a use tax obligation for the buyer. This assessment updates as vendor situations change and as economic nexus thresholds are crossed.
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Taxability determination by item and state
The system applies state-specific taxability rules to each purchase. Equipment may be taxable in one state but exempt in another. Software subscriptions may be taxable in New York but exempt in Florida. Freight may be taxable or exempt depending on the state and shipment details. Automated systems apply these rules consistently to every invoice — not just those selected for manual review.
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Use tax calculation and accrual posting
When a purchase is identified as subject to use tax — a taxable item from a vendor without nexus, with no sales tax charged — the system calculates the amount owed using the correct rate for the relevant state and jurisdiction. It automatically posts the accrual entry to the general ledger and flags the transaction in a use tax liability account, providing finance with a clear, auditable record by state and purchase.
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Exemption certificate integration
For purchases that should be exempt — manufacturing inputs, resale items, government purchases — the system verifies whether a valid exemption certificate is on file for the vendor. If a certificate is missing or expired, the system flags the purchase for certificate collection instead of accruing use tax incorrectly. This integration prevents both over-accrual and under-accrual.
Why this matters at scale
For companies nearing or exceeding hundreds of AP transactions per month — common for mid-market manufacturers, distributors, and SaaS companies — manual use tax review is not a slower version of automation. It is a fundamentally different process that produces fundamentally different outcomes. Automation is most valuable when purchase volume is high, vendor geography is broad, and purchase categories cross multiple states.
Conducting a Use Tax Exposure Review
Before implementing automation, most companies benefit from a backward-looking exposure review that assesses use tax liability accumulated in prior AP records. This review quantifies existing exposure for voluntary remittance before an audit — and establishes a baseline to demonstrate the benefit of going forward with automation.
What a use tax exposure review covers
- AP records for the past three to four years
- All purchases where no sales tax was charged
- Taxability determination by purchase category and state
- Vendor nexus assessment for the relevant time periods
- Use tax owed calculated by state and period
- Available exemptions that would reduce the obligation
Voluntary disclosure as a path forward
Companies that identify significant historical use tax exposure can pursue voluntary disclosure. Most states offer programs that limit the audit lookback period — typically to three or four years — and waive penalties for proactive disclosure. While interest still applies, the penalty waiver can reduce the total obligation by 10–25%.
Voluntary disclosure is generally preferable to waiting for an audit. If an auditor uncovers the same exposure, the company faces full penalties plus interest calculated from the purchase date, and the audit scope may expand to other tax areas.
ACTSOLV White Glove Services include use tax exposure reviews and voluntary disclosure support for companies assessing their historical AP liability. Learn more at actsolv.com/white-glove-solutions/.
ERP and AP System Integration: What to Expect
Automated use tax accrual is effective only when integrated with your actual AP data sources. Integration requirements vary by platform, but the general process is consistent.
Native ERP integrations
AUTOSOLV integrates with major ERP platforms. Data flows from AP in the ERP to the accrual engine, and accrual entries post back to the general ledger automatically. For most mid-market ERP deployments, integration completes within days rather than weeks.
Companies using dedicated AP automation platforms can integrate at the platform level rather than directly with the underlying ERP. The accrual engine receives invoice data from the AP platform, performs its analysis, and returns accrual recommendations that feed back into the platform's approval workflow.
What data the system needs
Required AP data fields
- Vendor name and address
- Invoice date, amount, and line items
- Purchase category or GL coding
- Ship-to or use location
- Whether sales tax was charged, and the amount if so
- Existing exemption certificates for the vendor, if any
Data quality considerations
Companies with clean, consistently coded AP data realize the most immediate value from automation. Those with inconsistent GL coding or vendor records may require a brief data quality review before achieving full system accuracy.
ACTSOLV's implementation process includes an AP data assessment to identify any necessary cleanup before go-live — so you're not paying for automation that can't run at full accuracy.
Identify and automate your use tax accrual process
AUTOSOLV continuously reviews your accounts payable data, identifies untaxed taxable purchases, calculates use tax owed by state, and automatically posts accrual entries to your general ledger. Schedule a consultation to discuss your AP system, purchase volume, and the states where you have the most exposure.
Related Resources
- AUTOSOLV: Automated Use Tax Accrual
- White Glove Solutions: Fully Managed Compliance
- Sales Tax Challenges for Manufacturing Companies
- How Sales Tax Software Monitors Economic Nexus Thresholds and Flags Risks Automatically
- Why State Auditors Are Winning Against Manual Certificate Management in 2026
- CertSOLV: Sales Tax Exemption Certificate Management Software
Frequently Asked Questions About Use Tax Accrual Automation
What is use tax and how is it different from sales tax?
Sales tax is collected by the vendor at the point of sale. Use tax is self-assessed by the buyer when the vendor does not collect sales tax. Both apply to the same taxable transactions — the difference is only in who collects and remits. When a vendor with nexus in your state charges sales tax, your obligation is satisfied. When a vendor without nexus doesn't charge, you owe use tax directly to your state.
How do we know if our company has significant use tax exposure?
Any company that purchases regularly from out-of-state vendors, uses online purchasing channels, or buys software and digital services from vendors without nexus in its state has use tax exposure. The size of the exposure depends on purchase volume, the taxability rules of the states where you operate, and how long the current AP process has been in place without systematic use tax review. An exposure assessment of three to four years of AP records will quantify it.
Does use tax apply to software and SaaS subscriptions?
In many states, yes. States that tax digital goods and software apply use tax to SaaS subscriptions and digital service purchases from vendors without nexus in the buyer's state. The taxability rules vary by state — some tax all digital services, some tax only specific categories, and some exempt SaaS entirely. The key is applying the correct rule for each state where your company uses the software, not a single blanket determination.
We have exemption certificates on file for vendors we buy from — does that eliminate our use tax obligation?
Only for the specific purchases covered by those certificates. A manufacturing exemption certificate covers raw materials and production equipment used in manufacturing — it does not cover office supplies, software subscriptions, or administrative purchases from the same vendor. Each exemption certificate has a defined scope, and use tax is owed on any purchase that falls outside that scope even if you have a certificate on file for that vendor.
How long does it take to implement automated use tax accrual?
For most mid-market companies with a major ERP — NetSuite, SAP, Dynamics — integration typically completes within a few weeks. The primary variables are data quality in the AP system and the complexity of the company's purchase categories across multiple states. ACTSOLV's implementation includes an initial AP data assessment, integration configuration, taxability rules setup by state, and validation testing before the system goes live on actual AP transactions.
What is the difference between use tax accrual automation and a full sales tax compliance platform?
Use tax accrual addresses the purchase side of the ledger — ensuring that untaxed purchases from vendors are identified and self-assessed correctly. Sales tax compliance addresses the sales side — calculating, collecting, and remitting tax on what you sell to customers. Both are necessary for full compliance. AUTOSOLV handles use tax accrual on the purchase side. ACTSOLV's CertSOLV handles exemption certificate management for customers on the sales side. The two systems work together to close both directions of B2B tax compliance exposure.
