Ohio Sales Tax Exemption Certificate: STEC B & U

An auditor opens your file, pulls thirty exempt invoices, and finds four certificates with a blank reason line. Those four sales are now taxable, and the tax comes out of your margin because the customer is long gone. Ohio exemption certificates fail on paperwork, not on eligibility. Here is which form to use and how to complete it so it survives.

What an Exemption Certificate Actually Does

An exemption certificate is not a discount coupon. It is a liability transfer.

Under R.C. 5739.03, a vendor that obtains a fully completed exemption certificate is relieved of liability for collecting and remitting tax on that sale. The liability moves to the purchaser, who can be assessed directly if the claim turns out to be wrong.

That is the whole mechanism. The vendor is protected by the document, not by the customer's honesty and not by the customer's tax-exempt status.

Which Ohio Certificate Do You Need?

Ohio publishes ten exemption certificates. Most businesses only ever touch the first two.

The full set, with fillable PDFs, is published on ODT's exemption certificates page.

Picking the Right One

Blanket or Unit: The Practical Difference

STEC U covers one purchase. You hand it over, it documents that invoice, and it is done.

STEC B covers every qualifying purchase from that vendor going forward. It is the form a restaurant gives its food distributor, a reseller gives its wholesaler, a manufacturer gives its parts supplier.

Use STEC B whenever the relationship is ongoing. Chasing a fresh unit certificate for every invoice is how gaps appear in the file — and a gap is exactly what an Ohio sales tax audit is designed to find.

One caution that catches people out: Ohio does not stamp a blanket certificate with an expiry date, but it stays valid only while the facts on it are still true. A change of entity, address, or exemption reason invalidates it silently. Nothing tells you. Re-confirming blanket certificates annually costs an afternoon and closes the largest single hole most vendors have.

Completing STEC B Without Getting It Rejected

The form is short. Four things decide whether it works.

1. The purchaser's full legal name and address. A trading name alone is a defect. Match the entity that is actually buying.

2. The vendor's name. A blanket certificate is vendor-specific. "All suppliers" is not a vendor.

3. The reason for exemption — written out. This is the line that fails. Ohio wants a stated statutory basis, not a category word. Compare:

4. A signature and date. An unsigned certificate is not a fully completed certificate, and "fully completed" is the statutory test.

The 90-Day Rule

Collect the certificate at the time of sale, or within 90 days after it. That is the window in which a certificate does its full statutory job of relieving the vendor of liability.

Certificates gathered after 90 days are not worthless. Ohio and the Streamlined Sales Tax rules allow an auditor to accept later or corrected certificates under a good-faith standard — you have to show the exemption was real, not merely produce a form after the fact. That is a worse position than having the paperwork on day one, and it is entirely avoidable.

The practical rule for any business making exempt sales: no certificate on file means you charge the tax. You can always refund it once the paperwork arrives. You cannot always collect it three years later.

Construction Contracts: CC and CO Are Not Interchangeable

This pair causes more expensive mistakes than the rest of the forms combined, because they look similar and allocate risk in opposite directions.

STEC CC — Construction Contract Exemption Certificate. Signed by both the contractor or subcontractor and the exempt contractee. The contractor retains the original. If the contract is later determined not to be exempt, liability transfers to the contractee, not to the contractor.

STEC CO — Contractor's Exemption Certificate. Signed by the contractor alone. It protects the vendor who sold the materials. It does not protect the contractor during an audit.

Read that difference twice. A contractor who accepts STEC CO as their own protection has protected their supplier and nobody else. Under R.C. 5739.03(B)(7), the lessee of a qualifying county-owned sports facility may sign on behalf of the county on either form.

Out-of-State Buyers and Multistate Forms

Ohio accepts two multistate documents in place of its own forms:

• The Multistate Tax Commission Uniform Sales and Use Tax Certificate, for resale and for items incorporated into products for sale.
• The Streamlined Sales Tax exemption certificate, accepted in place of STEC U, STEC B, STEC MV, STEC WC, STEC CO or STEC MPU. It can also notify a vendor of direct payment authority and support a multiple-points-of-use or direct-mail claim.

For business purchasers of software or services used concurrently across several sites, STEC MPU apportions the tax under R.C. 5739.033(B) rather than sourcing the whole purchase to one location. If you sell software into Ohio, pair this with Is Software Taxable in Ohio? before deciding what to charge.

What Vendors Must Do on Receipt

Accepting a certificate is an act with consequences, so treat it as one.

• Check that every field is completed. Blank reason line, blank signature, blank date: reject and re-request.
• Check the reason is plausible for what was sold. A resale claim on office furniture from a customer who resells lawn equipment is the kind of mismatch auditors sample for.
• File it against the customer account, not the invoice. Blanket certificates cover many invoices; filing per-invoice guarantees you cannot find them later.
• Retain it for at least four years. Ohio's assessment window reaches back further than most owners expect.
• Charge tax when in doubt. Refunding an over-collection is a customer-service problem. Under-collecting is a personal liability.

If your exempt sales volume is growing, the surrounding obligations are covered in the Ohio business sales tax compliance guide, and registration itself in Ohio Vendor's License.

Which Purchases Actually Qualify

A certificate documents an exemption; it does not create one. The purchase has to qualify under R.C. 5739.02 in the first place. The main categories Ohio recognises are resale, manufacturing, agriculture, government, qualifying non-profits, and specific enumerated items.

The full list, with the conditions attached to each, is in Ohio Sales Tax Exemptions. If the item is exempt for everyone — unprepared groceries, prescription drugs — you need no certificate at all, because there is no tax to relieve.

And if the purchase is taxable after all, check the rate against the full county rate table — remembering that an Ohio vendor charges its own county rate on an in-state sale.

Frequently Asked Questions

What is an Ohio sales tax exemption certificate? It is a form a buyer gives a seller to document why a purchase is not taxed. Ohio's two general-purpose versions are STEC U for a single purchase and STEC B for continuing purchases from the same vendor. Under R.C. 5739.03, a vendor who obtains a fully completed certificate is relieved of liability for the tax on that sale.

What is the difference between STEC B and STEC U? STEC U is a unit certificate covering one specific purchase. STEC B is a blanket certificate covering all qualifying purchases from the same vendor going forward, so it is the form a business gives to a supplier it buys from repeatedly.

Is an Ohio exemption certificate the same as a resale certificate? In Ohio, resale is one of the reasons you claim on a standard exemption certificate rather than a separate document. You use STEC B or STEC U and write a resale reason on the form. Ohio also accepts the Multistate Tax Commission uniform certificate and the Streamlined Sales Tax certificate for resale claims.

Does an Ohio exemption certificate expire? Ohio does not put a fixed expiry date on a blanket certificate. It stays valid while the facts on it remain true, so it fails the moment the buyer's business, address or exemption reason changes. Reconfirming blanket certificates on a schedule is a practical safeguard, not a legal deadline.

How long does a vendor have to get an exemption certificate? The usual window is at the time of sale or within 90 days after it. Certificates gathered later can still be accepted, but they are held to a good-faith standard during an audit rather than automatically relieving the vendor of liability.

Do I need a vendor's license to claim an Ohio exemption? Not necessarily. A vendor's license is what you need to collect and remit sales tax. To claim an exemption as a buyer you need a valid reason under R.C. 5739.02 and a properly completed certificate. Many exempt purchasers, such as churches and government bodies, hold no vendor's license at all.

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Working out what a sale would have cost with tax, or checking an invoice a customer is disputing? The Ohio sales tax calculator splits the state and county portions for any county and amount.

Form names and their uses are taken from the Ohio Department of Taxation's exemption certificates page. This guide is general information, not tax advice for a specific transaction — confirm a marginal exemption with ODT or your own advisor before relying on it.