California's FY 2023–24 sales and use tax audits alone disclosed $518.8 million in net deficiencies — a figure that reflects how aggressively states pursue non-compliance. B2B sellers aren't immune to that scrutiny.
This article covers the core rules B2B businesses need to understand: how to determine when a sale is taxable, which exemptions exist and how to claim them properly, how nexus obligations work across state lines, and what practical steps can protect your business from costly surprises.
Key Takeaways
- Not all B2B sales are tax-exempt — taxability depends on intended use, product type, and the state
- Missing or invalid exemption certificates can make the seller liable for uncollected tax
- Economic nexus applies even without a physical presence — most states use a $100,000 / 200 transaction threshold
- Use tax is the buyer's responsibility when a seller doesn't collect sales tax on a taxable purchase
- State rules vary significantly — Maryland and Ohio, for example, have distinct exemption structures and documentation requirements
What Counts as a Business-to-Business Sale for Tax Purposes?
A B2B sale occurs when one business sells goods or services to another business rather than to an individual end consumer. That classification alone, however, tells you nothing about whether the transaction is taxable. The determining factor is the buyer's intended use.
A retailer buying 500 units of a product to resell them is treated entirely differently than a business buying those same 500 units for internal office use. The former typically qualifies for a resale exemption; the latter is generally subject to sales tax. Same product, same seller — different tax treatment.
Common B2B Transaction Categories and How They're Taxed
| Transaction Type | Typical Tax Treatment |
|---|---|
| Goods purchased for resale | Exempt (with valid resale certificate) |
| Raw materials used in manufacturing | Exempt in most states (with documentation) |
| Equipment for internal business use | Taxable in most states |
| Business services (accounting, IT, marketing) | Varies widely by state |
| Government or nonprofit purchases | Often exempt (state-specific rules apply) |
This is the critical distinction between B2B and B2C taxation. In B2C, sales tax is almost always collected at the point of sale. In B2B, many purchases are exempt — but sellers cannot assume exemption without verifying the buyer's status and collecting the right paperwork. Without that documentation, the seller can be held liable for the uncollected tax, plus any penalties and interest the state assesses.
Understanding Sales Tax Nexus in B2B Transactions
Before a business is obligated to collect sales tax in any state, it must have nexus there — a legal connection to that jurisdiction sufficient to create a tax collection duty. Nexus can arise in two ways.
Physical Nexus
Traditional physical nexus triggers include:
- Maintaining an office, warehouse, or retail location in the state
- Having employees, agents, or sales representatives active in the state
- Storing inventory there, including through third-party fulfillment centers
- Sending employees to trade shows or client sites in another state
Two triggers B2B sellers commonly miss: fulfillment centers and trade shows. If your goods sit in a warehouse in another state — even one operated by a third-party logistics provider — you may already have nexus there.
Economic Nexus After Wayfair
The 2018 Supreme Court ruling in South Dakota v. Wayfair upended the previous physical-presence standard. States can now require businesses to collect sales tax based purely on sales volume or transaction count, with no physical presence required.
Most states set thresholds at $100,000 in annual sales or 200 transactions. Key variations:
- Maryland: More than $100,000 or 200+ transactions in the previous or current calendar year
- Ohio: More than $100,000 or 200+ separate sales in the current or prior year
- Illinois: $100,000 or more (the 200-transaction test was eliminated January 1, 2026)
- California: Sales exceeding $500,000 in the preceding or current calendar year
- Texas: Safe harbor below $500,000 in total Texas revenue in the prior 12 months
Once you cross a threshold, you're obligated to collect that state's sales tax on applicable sales — even if the same product would be exempt in your home state.
The SSUTA Option for Multi-State Sellers
Managing separate registrations across every state where you've crossed a threshold can get unwieldy fast. The Streamlined Sales and Use Tax Agreement (SSUTA) addresses that directly. Its 24 member states allow businesses to register in all member states at once through the Streamlined Sales Tax Registration System, cutting multi-state registration down to a single application.
B2B Sales Tax Exemptions: Types and How They Work
Exemptions exist primarily to prevent tax pyramiding — the problem that arises when the same goods are taxed repeatedly as they move through a supply chain before reaching the end consumer. The exemption defers the tax collection to the final sale, where it belongs.
Resale Exemptions
When a business buys goods specifically to resell them, it can provide a resale certificate to the seller and purchase those goods tax-free. The seller is then responsible for retaining that certificate as documentation.
A valid resale certificate generally must include:
- Buyer's name and address
- Buyer's sales tax permit number
- Description of the goods being purchased
- Statement that the goods are for resale
- Buyer's signature and date
Requirements differ by state. A few examples:
- Illinois uses Form CRT-61
- Maryland requires the buyer's registration number and business type; sellers must retain certificates for at least four years
- Ohio uses the STEC U form and requires vendor details alongside the buyer's exemption reason
The documentation rules carry real consequences. Maryland holds sellers liable when they accept a certificate they knew or should have known was fraudulent. In Ohio, a sale is treated as presumptively taxable if a valid certificate isn't obtained within 90 days of the transaction.
Manufacturing Exemptions
Most states exempt machinery, equipment, and materials used directly in the manufacturing process. The operative word is "directly."
- Machinery on the production line: exempt
- Office equipment used by factory management: taxable
- Utilities used exclusively in production: exempt in some states (New York requires "direct and exclusive" use)
Ohio defines the qualifying manufacturing operation as the period from commitment of materials through completion of the product. Maryland covers production of tangible personal property for sale or resale. Verify each state's specific definition before claiming this exemption — the line between qualifying and non-qualifying use shifts significantly across state lines.
Beyond resale and manufacturing, several other categories may reduce your tax liability depending on where you operate.
Other Common B2B Exemptions
- Government purchases: U.S. and state government entities are typically exempt in most states
- Nonprofit organizations: 501(c)(3) organizations qualify in Ohio; Maryland covers listed governments and nonprofits but excludes unrelated business use
- Agricultural inputs: Seed, fertilizer, feed, livestock, and qualifying machinery are exempt in Tennessee and other agricultural states
- Energy purchases: Fuel or electricity used in manufacturing may qualify for exemption in certain states
Each category requires its own documentation, and qualifying criteria differ by state. An exemption that applies cleanly in Ohio may require additional proof — or may not apply at all — in Maryland or Illinois. Confirm requirements in every state where you operate before relying on an exemption.
Use Tax Obligations for B2B Businesses
Use tax is what businesses owe when they purchase taxable goods or services without paying sales tax at the point of purchase. States created use tax to prevent businesses from avoiding tax liability through out-of-state purchases. Rates match the state's sales tax rate.
Common B2B Use Tax Triggers
- Buying equipment or supplies from an out-of-state vendor that lacks nexus in your state
- Purchasing items online where no sales tax was charged
- Withdrawing items from resale inventory for internal business use
- Buying goods under a resale certificate but later using them for an internal purpose
Maryland applies its 6% sales/use rate to out-of-state purchases and credits tax paid to another state — but if the other state's rate was lower, Maryland expects the buyer to pay the difference.
The Direct Pay Permit Option
Larger businesses may qualify for a Direct Pay Permit, which allows them to self-assess and remit all sales and use tax directly to the state rather than paying it at the point of purchase. This gives businesses better control over their tax positions and improved cash flow, but it comes with ongoing audit exposure and strict internal tracking requirements.
Key considerations before pursuing a Direct Pay Permit:
- Eligibility is state-specific — New York, for example, limits permits to registered businesses with a New York place of business that cannot determine taxable use at the time of purchase
- Misuse carries real consequences — back taxes, interest, penalties, and permit revocation are all possible outcomes
- Not every state offers the program — confirm availability in your state before planning around it
State-Specific B2B Sales Tax Rules to Know
Maryland
Maryland imposes a 6% rate on tangible personal property, taxable services, and digital products. Services are generally exempt unless specifically enumerated — meaning the official taxable list controls, not B2B status alone.
Taxable services include:
- Commercial building cleaning
- Security services
- Credit reporting
- Telecommunications
- Delivery of electricity or natural gas
Starting July 1, 2025, data, IT, and software-publishing services are taxed at 3%.
For manufacturing exemptions, Maryland covers production of tangible personal property for sale or resale. Resale certificates require the buyer's name, address, registration number, business type, goods description, and signature. Sellers who accept certificates they knew were improper may be held liable for the uncollected tax.
Ohio
Ohio's state sales tax rate is 5.75%, plus applicable local taxes. Key B2B exemptions cover:
- Goods purchased for resale
- Components incorporated into products being manufactured for sale
- Qualifying machinery and equipment used in the statutory manufacturing operation
Ohio's rules on exemption certificates are strict. A fully completed certificate relieves the vendor of liability unless fraud or bad faith is involved. Without a certificate obtained within 90 days of the sale, the transaction is presumed taxable.
Ohio does provide limited proof procedures after an audit notice arrives — but that's a difficult position to recover from. Getting the certificate at the time of sale is always the safer path.
How to Stay Compliant with B2B Sales Tax
Manage Exemption Certificates Proactively
Collecting and retaining exemption certificates is the single most important compliance task for B2B sellers. Certificates should be:
- Verified for completeness when received
- Signed, dated, and retained for the state-required period (four years in Maryland; check each state individually)
- Reviewed periodically to catch expired or invalid certificates before an audit finds them first
A missing certificate can convert an exempt sale into a taxable one — with interest and penalties attached.
Build Internal Controls and Use Technology
Standardized procedures reduce the risk of manual errors across multi-state operations:
- Map your nexus obligations — track where you have physical or economic nexus and update as thresholds change
- Classify transactions correctly — document why each sale is taxable or exempt at the time of the transaction
- File on time in every jurisdiction — late filings generate penalties even when the underlying tax is correct
- Consider sales tax automation software — these tools calculate rates, manage certificates, and produce filing-ready reports
F.I.C. (Financial Innovations Consulting) offers sales tax compliance services priced at $100 per form per state or city — a predictable structure for businesses managing multiple jurisdictions. A business filing in two states and one city, for example, pays $300 total. For businesses wanting integrated ongoing compliance, The FIC Package bundles sales tax filing with bookkeeping, payroll, advisory services, and year-end tax returns starting from $500 per month.
Prepare for Audits Before They Happen
State tax authorities conduct sales and use tax audits routinely, and B2B businesses with multi-state operations or incomplete exemption certificate files are frequent targets. Organized records — including sales documents, purchase orders, exemption certificates, and filing confirmations — are your first line of defense.
F.I.C. helps businesses across multiple states build clean compliance records, resolve past liabilities, and defend against audits when they arise. With 35+ years of multi-state tax experience, the firm's audit assistance covers IRS, state, and workers' compensation audits — giving businesses a knowledgeable advocate before a problem escalates into a larger liability.
Frequently Asked Questions
What counts as business-to-business sales?
B2B sales are transactions between two businesses — such as a manufacturer selling to a retailer or a supplier selling to a service provider. Their tax treatment depends on the buyer's intended use, the type of goods or services sold, and the applicable state's rules. A B2B label alone doesn't determine taxability.
What is the B2B sales tax exemption for business-to-business transactions?
The most common B2B exemptions are resale exemptions (goods purchased to resell) and manufacturing exemptions (equipment and materials used directly in production). All exemptions require valid buyer documentation — typically a resale or state-specific exemption certificate — before the seller can legally exempt the transaction.
What are the business-to-business sales tax rules in Maryland?
Maryland imposes a 6% rate on taxable goods and specifically enumerated services — services are generally exempt unless listed on Maryland's official taxable services list. Manufacturing exemptions apply to production of tangible personal property for sale or resale, and sellers must retain exemption certificates for four years or risk liability for knowingly accepting improper ones.
Who is exempt from business-to-business sales tax in Ohio?
Ohio exempts resellers, manufacturers purchasing qualifying machinery and production inputs, U.S. and Ohio government entities, and qualifying 501(c)(3) nonprofits. Sellers must obtain a completed Ohio exemption certificate (STEC U or STEC B) within 90 days of the transaction — without it, the sale is presumed taxable.
Do businesses have to charge sales tax when selling to other businesses?
Whether sales tax applies depends on the seller's nexus in the buyer's state and whether the goods or services are taxable there. If both conditions are met, sales tax must be collected unless the buyer provides a valid exemption certificate — assuming otherwise is exactly what triggers audit liability.
What is a resale certificate and how does it work in B2B transactions?
A resale certificate is a buyer-signed document stating that purchased goods are intended for resale rather than internal use. It shifts the sales tax obligation to the point of final sale — when the buyer collects tax from the end consumer — and sellers must retain these certificates as proof of the exemption.
