# Sales tax for distributors

> How US sales and use tax works for a wholesale distributor, covering resale certificates, economic nexus after Wayfair, sourcing, drop ships and tax engines.

Source: https://docs.lumina-erp.com/distribution/sales-tax-for-distributors/

**In short.** Most of a distributor's sales are exempt because the customer will resell the goods, but the exemption only holds if you have a valid certificate on file for that customer and state. Since Wayfair (2018), you may also owe collection in states where you have no building or staff, once your sales there pass the state's threshold.

A wholesale distributor collects less sales tax than a retailer, but it carries more risk per dollar. Most of your sales are tax-exempt because the buyer will resell the goods, and every one of those exemptions has to be proven with paperwork if a state audits you.

:::caution[Not tax advice]
What follows is a general orientation, not tax advice. Sales and use tax rules vary by state, and often by city and county, and they change. Confirm anything you will file or rely on with a tax professional who knows the states you sell into.
:::

## Sales tax and use tax at a glance

| Tax | Who owes it | Who collects and remits it | When a distributor meets it |
|---|---|---|---|
| Sales tax | The buyer, on a taxable retail sale | The seller, if it is registered in or has nexus with the state | Sales to end users, such as contractors, manufacturers or institutions using the goods |
| Use tax | The buyer, when no sales tax was charged on a taxable purchase | The buyer, directly to the state | Supplies and equipment you buy for your own use from sellers that did not charge tax, and inventory you pull for internal use |
| Seller's use tax | The buyer | A remote seller registered in the state | Sales into states where you are registered but have no location |

The two taxes are designed as a pair. If the seller does not collect sales tax on a taxable sale, the buyer owes use tax at the same rate.

## Resale exemption certificates

A distributor's biggest exempt category is **sales for resale**. When a customer buys goods to resell, the sale is generally exempt, but only if the customer gives you an exemption certificate and you keep it. In an audit, an exempt sale with no valid certificate on file is usually treated as a taxable sale on which you failed to collect, so the tax, interest and sometimes penalties fall on you.

### What makes a certificate valid

- **The right form for the state.** Many states accept their own form, and many also accept a multistate form. The Streamlined Sales Tax Exemption Certificate is accepted by the Streamlined member states, and the Multistate Tax Commission says 36 states have indicated its Uniform Sales & Use Tax Resale Certificate can be used for resale (both retrieved 2026-09-28). Neither body guarantees acceptance, so check each state.
- **Complete fields.** Buyer name and address, the buyer's registration or permit number where the state requires one, the reason for exemption, signature and date.
- **Taken in good faith.** A seller generally has to accept a certificate only for goods the buyer plausibly resells. A resale certificate from a plumbing contractor does not cover the office furniture they order.
- **Current.** Some states set a fixed life for a certificate or require renewal. Others treat it as valid until revoked. Track an expiry or review date per certificate and state.

### Where certificate programs fail

| Gap | Result in an audit |
|---|---|
| New customer set up as exempt before the certificate arrived | Every sale until the certificate arrived is taxable |
| Certificate for one state, sales shipped to another | The other state's sales are unsupported |
| Expired certificate, or one the state no longer accepts | Sales after the expiry are unsupported |
| Exempt flag set on the customer, not tied to a certificate record | No one can prove which document supports which sales |
| Certificate filed in email or a shared drive | It exists but cannot be found when the auditor asks |

To close these gaps, enforce one rule in the ERP or the tax engine. A customer ship-to is exempt in a state only while a valid certificate for that state is on file.

## Economic nexus after Wayfair

Before 2018, a state could generally require a seller to collect its sales tax only if the seller had a physical presence there, under Quill Corp. v. North Dakota. On June 21, 2018, the Supreme Court decided **South Dakota v. Wayfair**, overruling Quill and the earlier National Bellas Hess decision. The South Dakota law at issue required collection from out-of-state sellers that, each year, delivered more than $100,000 of goods or services into the state or made 200 or more separate sales into it.

Since then every state with a sales tax has adopted some form of economic nexus. Thresholds, the period measured and whether exempt and wholesale sales count toward the threshold all differ by state, and several states have changed their rules since first adopting them. For a distributor this matters in two ways:

- Wholesale sales can count. In some states, sales for resale count toward the threshold even though no tax is due on them. You can have to register and file returns showing mostly exempt sales.
- Once you register, certificates matter in more states. Every state you register in is a state where each exempt customer needs a certificate on file.

Review sales by destination state at least yearly against each state's current threshold. The month-end step in [Month-end close for distributors](/erp-projects/month-end-close-for-distributors/) is a good place to do it.

## Streamlined Sales Tax

The Streamlined Sales and Use Tax Agreement (SSUTA) is a multistate effort to make sales tax rules and administration more uniform. Per the Streamlined Sales Tax Governing Board's FAQ (retrieved 2026-09-28), 23 states are full members and Tennessee is an associate member. The Board's other pages refer to the 24 Streamlined member states.

What it offers a distributor:

- One registration system for any or all member states
- Uniform definitions and published taxability matrices, so you can see how each member state treats a product category
- The Streamlined exemption certificate, accepted across the member states, with state-specific rules on which exemptions each allows

The large states outside the agreement, such as California, Texas, Florida, New York and Illinois, each keep their own rules and forms.

## Sourcing: which rate applies

Most states source a sale of shipped goods to the **destination**, meaning the ship-to address. The rate is the combined state and local rate at that address, which can differ between two addresses in the same ZIP code. A few states source some in-state sales to the seller's location instead. The practical consequences:

- Tax is calculated on the ship-to rather than the bill-to. A customer with a head office in one state and branches in five has five tax situations.
- Will-call orders are sourced to your counter in most states, because the customer takes possession there.
- Ship-to addresses need to be clean. A wrong ZIP code or a missing jurisdiction code is a wrong rate.

## Drop ships and third-party exemptions

A drop ship has three parties: your customer (the retailer or reseller), your supplier who ships the goods and the end buyer who receives them. The tax question is who is selling to whom, in which state and who holds a valid certificate.

| Role | Question to answer |
|---|---|
| You buy from a supplier who ships to your customer's customer | Does your supplier need your resale certificate for the delivery state, and will that state accept a certificate from a seller not registered there? |
| You sell to a reseller, and ship directly to the reseller's customer | Is the reseller registered in the delivery state? If not, some states expect you to collect tax from the reseller on the sale |
| You ship to an end user on a customer's instruction | The end user's exemption, if any, is the one that matters for that sale |

The Streamlined Board's own guidance tells drop shippers to check with each state, because treatment varies. Drop ships are among the most common audit findings for distributors, so settle the rule per state with your tax adviser and set it in the system.

## Use tax on your own purchases

Distributors owe use tax more often than they expect:

- Supplies and equipment bought from out-of-state sellers that did not charge tax.
- Inventory taken for your own use, such as stock used for shop supplies, samples or a repair. You bought it tax-free for resale, so pulling it for internal use makes it taxable.
- Purchases where the supplier did not charge tax in error.

The usual control is a use tax accrual in accounts payable. You flag untaxed invoices for taxable items, accrue the tax and report it on the state return. Inventory issued to internal accounts needs the same treatment.

## Tax engines versus in-ERP tax tables

| Approach | How rates and rules are kept | Fits when | Watch for |
|---|---|---|---|
| ERP tax tables | You maintain jurisdictions, rates and taxability codes | Sales in one or two states, mostly exempt customers, few rate changes | Rates and rules change often; every update is your job and easy to miss |
| Tax engine (external service) | The provider maintains rates, jurisdictions, product taxability and often certificate storage; the ERP calls it at order and invoice | Registered in many states, mixed taxable and exempt sales, many ship-tos | Per-transaction or subscription cost; the ERP integration must send the right ship-to, item tax code and exemption on every call |
| Certified Service Provider (CSP) | A provider certified under the Streamlined program calculates, files and remits for member states | Remote sales into Streamlined states | Covers member states only |

Whichever you use, the ERP still owns the inputs: clean ship-to addresses, an item tax code on every item and the exemption status per customer and state.

## Audit readiness

A sales tax audit usually samples invoices and asks you to support every exempt sale and every rate. Keep these ready:

- [ ] **Every exempt customer has a certificate per state**, findable in minutes, with dates.
- [ ] **Invoices show tax by jurisdiction**, and tax collected ties to the returns filed.
- [ ] **Credit memos reverse tax correctly** and are reported in the right period.
- [ ] **Use tax accruals are documented** for untaxed purchases and internal use of inventory.
- [ ] **A nexus review is dated and saved**, showing sales by state against each threshold.
- [ ] **Drop-ship and will-call rules are written down** per state, with the adviser's input.

## Closing your exposure

1. Pull exempt sales for the last 12 months by customer and ship-to state, and match each to a certificate on file. The gaps are your largest exposure.
2. Run sales by destination state against current economic nexus thresholds.
3. Tie exempt status to certificate records in the ERP or tax engine, with expiry dates.
4. Set up a use tax accrual for untaxed purchases and inventory issued for internal use.
5. Take the results to a tax professional before you register in new states or change sourcing or drop-ship rules.

## Sources

- [South Dakota v. Wayfair, Inc., No. 17-494 (2018) (Supreme Court of the United States)](https://www.supremecourt.gov/opinions/17pdf/17-494_j4el.pdf)
- [FAQs, Information About Streamlined (Streamlined Sales Tax Governing Board)](https://www.streamlinedsalestax.org/Shared-Pages/faqs/faqs---about-streamlined)
- [Exemptions (Streamlined Sales Tax Governing Board)](https://www.streamlinedsalestax.org/Shared-Pages/exemptions-)
- [Registration FAQ (Streamlined Sales Tax Governing Board)](https://www.streamlinedsalestax.org/for-businesses/sales-tax-registration-sstrs/registration-faq)
- [Uniform Sales & Use Tax Resale Certificate (Multistate Tax Commission)](https://www.mtc.gov/resources/uniform-sales-use-tax-exemption-certificate/)

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