Most manufacturers think about sales tax from one direction: collecting it from customers. The buy side carries equal risk — and auditors examine both sides simultaneously.
What You'll Learn
- Why manufacturers face tax exposure on both purchases and sales
- What the buy-side manufacturing exemption requires
- What happens when sell-side exemption certificates are missing
- Why most tax software only solves half the problem
- How CertSOLV and AUTOSOLV address both sides together
The core risk
When auditors examine manufacturer records, they review both sides. Missing certificates on customer transactions create tax liability. Missing documentation for claimed manufacturing exemptions on vendor purchases create separate liability. Getting one side right while neglecting the other still produces an audit finding.
Manufacturers must issue and manage exemption certificates for the purchases they make. The documentation requirements on both sides are significant. When auditors examine manufacturer records, they review both sides.
Manufacturers Have Two Separate Tax Obligations
When a manufacturer sells finished goods to a customer who claims an exemption, the manufacturer must collect a valid exemption certificate before the transaction closes.
- Certificate must be current, complete, and on the correct form for the state where the sale occurred
- Accepting an incomplete certificate is treated the same as having no certificate in an audit
- Missing certificates make those transactions presumptively taxable
When a manufacturer purchases raw materials, equipment, or supplies, it can often claim a manufacturing exemption — but only with proper documentation on file.
- Your company issues an exemption certificate to your vendor
- Each state has its own approved certificate form
- Issuing the wrong form voids the exemption in an audit, even when the claim is valid
Both sides of this equation get reviewed in a sales and use tax audit.
The Sell Side: Your Customer Transactions
Collecting certificates from your customers
When a B2B customer claims an exemption on a purchase, you need a valid certificate before the transaction closes. The certificate must be current, complete, and issued on the correct form for the state where the sale occurred. Accepting an incomplete certificate is treated the same as having no certificate in an audit.
What happens when a certificate is missing
An auditor who finds exempt sales without valid certificates treats those transactions as fully taxable. Tax is assessed on the full sale amount, plus interest and penalties. Auditors use a sample of transactions to extrapolate liability across the full audit period. A certificate gap in the sample becomes a much larger assessment across your entire transaction history.
The ACTSOLV case study on missing exemption certificates shows exactly how this plays out. A company with incomplete certificate documentation discovered the exposure during a state audit — not before it.
Renewal and validation requirements
Exemption certificates don't last indefinitely. Many states require certificates to be renewed every one to four years. Others require renewal when business information changes. A certificate that was valid when collected may be expired by the time an auditor asks for it. Tracking expiration dates manually across hundreds or thousands of customers is not a reliable process.
CertSOLV manages certificate collection, validation, and renewal tracking for customer transactions. It flags certificates approaching expiration before they lapse. It validates each certificate against the requirements of the specific state where it applies.
CertSOLV handles both sell-side and buy-side certificate management — collection, validation, renewal tracking, and audit-ready documentation across all your nexus states.
Schedule a ConsultationThe Buy Side: Your Vendor Purchases
When you can claim a manufacturing exemption
Most states exempt raw materials that become part of a finished product from sales tax. Many states also exempt equipment used directly in the manufacturing process. The specific scope of these exemptions varies by state. A purchase that qualifies in one state may be fully taxable in another.
According to the Sales Tax Institute, manufacturing exemptions are among the most audited areas in sales tax compliance. Auditors scrutinize them because the potential assessments are large and the documentation requirements are specific.
What certificates you need to issue to vendors
To claim a manufacturing exemption on a purchase, your company issues an exemption certificate to your vendor. The certificate tells the vendor not to charge sales tax. Each state has its own approved certificate form. Issuing the wrong form — even when your exemption claim is valid — can void the exemption in an audit.
The guide to collecting vendor exemption certificates covers what documentation manufacturers need before the first exempt purchase — not after the fact.
Use tax when no exemption applies
Not every vendor purchase qualifies for a manufacturing exemption. Supplies used in the facility rather than in production — maintenance items, office supplies, and similar purchases — are generally taxable. When those purchases come from out-of-state vendors who don't charge sales tax, your company owes use tax.
AUTOSOLV reviews AP invoices to identify which purchases triggered a use tax obligation. This happens through batch processing of your AP data. The output is a clear accrual record for each taxable purchase, organized by jurisdiction.
Why Most Tax Software Only Solves Half the Problem
Many sales tax compliance tools are built around one function: calculating and collecting tax on sales. That handles part of the sell-side collection obligation. It does not address sell-side certificate management, buy-side manufacturing exemptions, or use tax on vendor purchases.
A manufacturer using a single-function tool may have clean sales tax filings and still face a significant audit assessment. The gaps live on the sides of the compliance picture that single-function tools don't reach.
The audit doesn't care what software you use. An auditor examining a manufacturer's records will review customer exemption certificates, vendor exemption certificates issued, and use tax accrual records — in the same audit. A tool that only addresses one of those three areas leaves two exposed. See the 5 red flags in your exemption certificate process for the most common signs of structural gaps.
How CertSOLV and AUTOSOLV Cover Both Sides
CertSOLV — both buy and sell side
Handles exemption certificate management for customer transactions (sell side) and vendor relationships (buy side). Stores certificates, tracks expiration dates, validates state-specific requirements, and provides audit-ready documentation for all exempt transactions.
AUTOSOLV — use tax on vendor purchases
Handles use tax accrual on vendor purchases. Reviews AP invoices in batches, identifies purchases where use tax is owed, calculates liability by jurisdiction, and maintains a complete record for audit purposes.
Together, the two platforms address both sides of the manufacturer's compliance equation. The manufacturing industry page covers how ACTSOLV serves manufacturers in more detail. The manufacturing FAQ addresses common taxability questions specific to the sector.
Frequently Asked Questions: Manufacturing Sales Tax
What is the manufacturing exemption for sales tax?
The manufacturing exemption allows manufacturers to purchase certain inputs without paying sales tax. Raw materials that become part of a finished product are commonly exempt. Equipment used directly in the manufacturing process is exempt in many states. The specific scope varies by state and must be documented with the correct exemption certificate issued to the vendor.
Do manufacturers need to collect exemption certificates from customers?
Yes. When a manufacturer sells finished goods to a customer claiming an exemption — such as a resale exemption or an industrial exemption — the manufacturer must collect a valid exemption certificate before the sale. Failing to collect or retain a valid certificate makes the transaction presumptively taxable in an audit.
What is use tax and why does it apply to manufacturers?
Use tax applies to taxable purchases where the vendor did not charge sales tax. For manufacturers, this most commonly affects out-of-state vendor purchases, equipment, and supplies that don't qualify for the manufacturing exemption. The manufacturer is responsible for self-assessing and remitting use tax directly to the state on those purchases.
How should manufacturers keep exemption certificate records?
Certificates should be collected before or at the time of the exempt transaction, validated for completeness and state-specific format requirements, stored in a retrievable system tied to the transaction record, and monitored for expiration. Most states require certificates to be renewed periodically. A systematic certificate management process is the most reliable way to ensure records are complete and current when an audit occurs. See the full guide to building an audit-ready exemption certificate database.
Cover Both Sides of Your Manufacturing Compliance
CertSOLV manages your exemption certificates on both buy and sell side. AUTOSOLV handles use tax accrual on vendor purchases. Schedule a consultation to see how both work together for manufacturers.
