Origin-based vs. destination-based sales tax comes down to one question: whose local rate applies. Under destination-based sourcing, you charge the rate at the buyer’s location. Under origin-based sourcing, you charge the rate at your business location. Most states use destination rules; about a dozen use origin rules, but only for sales that begin and end inside the state. The moment a sale crosses a state line, origin states switch to destination rules too, which means almost every seller with any interstate activity ends up applying destination sourcing at least part of the time.
Getting the rate wrong is your problem, not the customer’s. If you charged 6% and the correct rate was 8.5%, the 2.5% comes out of your pocket. You cannot go back and bill the customer after the fact.
How Destination-Based Sourcing Works
Under destination-based sourcing, the tax rate at the buyer’s location controls the transaction. Ship a product, and the state and local rates at the delivery address apply. For an in-person sale, the rate at the store where the customer picks up the item governs. The revenue flows to the community where the goods are consumed, which is why most states and the District of Columbia have adopted this approach.
The hard part is address-level precision. A single metropolitan area can contain dozens of overlapping jurisdictions: the state rate, a county rate, a city rate, and sometimes additional levies from special-purpose districts that fund transit, stadiums, or other local projects.1Federal Highway Administration. Sales Tax Districts Two customers five miles apart may owe different amounts on the same purchase. You need the customer’s full street address, not just a state or ZIP code, to identify the correct combined rate.
For any meaningful volume, this means automated tax calculation software that maps addresses to jurisdictions in real time. Tracking thousands of local rates by hand leads to undercollection, and the business absorbs the shortfall.
How Origin-Based Sourcing Works
About a dozen states take the opposite approach for sales that start and end within their borders. Under origin-based rules, the tax rate at your business location applies — your store, office, or warehouse — no matter where in the state the customer lives. A single-location seller charges one consistent local rate on every intrastate sale, which simplifies compliance considerably.
The tradeoff is competitive unevenness. Two businesses in different parts of the same state may charge different total rates on identical products, so a seller in a low-tax jurisdiction has a small built-in pricing advantage over a competitor across the county line.
Multiple locations inside an origin state complicate things. The rate at the location that fulfills or processes the order typically controls, but states differ on what “fulfills” means. Some look to where the order is accepted; others look to where the goods ship from. If your headquarters takes the order and a warehouse in a different county ships it, you need to know which location your state treats as the point of origin. This is one of the most common sourcing errors in multi-location businesses, and it usually only surfaces during an audit.
Why Origin States Still Apply Destination Rules to Out-of-State Sales
Origin-based sourcing only applies to intrastate sales. Once a sale crosses state lines, even origin states require you to collect at the destination rate. If you sell nationally from an origin state, you operate under both systems at once: origin rules for local customers, destination rules for everyone else.
The same logic runs the other way. Inside a destination state, a package sent from one county to another uses the rate at the delivery address, and every local jurisdiction the delivery address falls inside adds its own layer. Special-purpose districts are increasingly common and can add fractional percentages that change block by block in dense urban areas.
Very few businesses can ignore destination sourcing entirely. The only sellers truly on a single-rate system are those who sell exclusively to customers in their own origin-based state.
When Out-of-State Sales Require You to Collect: Economic Nexus
Until 2018, a state could only require you to collect its sales tax if your business had a physical presence there — a store, warehouse, or employee. The Supreme Court’s decision in South Dakota v. Wayfair, Inc. ended that rule, holding that states can require collection based on economic activity alone.2Supreme Court of the United States. South Dakota v. Wayfair, Inc., 585 U.S. 2018 Every state with a sales tax has since enacted an economic nexus law.
The threshold in the original case was $100,000 in annual sales or 200 separate transactions delivered into the state.2Supreme Court of the United States. South Dakota v. Wayfair, Inc., 585 U.S. 2018 Most states adopted similar numbers, though a handful set higher dollar thresholds. Since 2018, a growing number of states have dropped the transaction-count test; as of early 2026, at least 16 states have eliminated the 200-transaction prong and rely solely on the dollar threshold.
Once you cross a state’s threshold, you have to register with that state’s revenue department and start collecting at the destination rate. Registration itself is usually free or nominal. The ongoing burden is tracking rates, filing returns, and remitting across every state where you have nexus. Sellers active in many states can use the Streamlined Sales Tax Registration System to register in participating member states through one portal, and can contract with Certified Service Providers that handle calculation and filing.3Streamlined Sales Tax Governing Board. FAQs – Information About Streamlined
Sourcing Digital Products and Services
Physical goods have a clear ship-to address. Digital products don’t. When a customer downloads software or streams a movie, there’s no shipping label pointing at a tax jurisdiction.
States that tax digital goods overwhelmingly source them to the buyer’s location, following destination logic. The customer’s billing address, IP address, or the address on file with their account determines the rate. Not every state taxes digital goods, and those that do vary in what they include: downloaded music, streaming subscriptions, SaaS platforms, and e-books may each be treated differently.
Taxable services follow one of two sourcing models. The older approach sources services to where the work is performed. The newer model, called market-based sourcing, looks instead at where the customer receives the benefit and now represents the majority approach among states that tax services. For a consulting firm serving clients across the country, the difference is significant: under market-based sourcing, you have to track each client’s location instead of applying rates where your own office sits.
Marketplace Sales and Drop Shipping
Marketplaces Collect on Your Behalf
If you sell through a major platform like Amazon, eBay, or Etsy, the platform handles sales tax collection and remittance on those transactions. Every state with a sales tax now requires marketplace facilitators to collect once they meet the state’s economic nexus threshold. The facilitator determines the destination rate, collects from the buyer, and remits.
That doesn’t always let you off the hook for registration. Some states still require marketplace sellers to register and file returns even when the facilitator collects the tax on platform sales.4Streamlined Sales Tax Governing Board. Marketplace Facilitator And if you also sell through your own website, at trade shows, or through any channel outside the marketplace, those sales are entirely your responsibility to source, collect, and remit.
Drop Shipping Adds a Third Party
Drop shipping brings a wholesaler or manufacturer into the sourcing equation. A customer buys from you; someone else ships directly to the customer. Who owes the tax depends on the state.
In roughly 33 of the 46 jurisdictions that impose a sales tax, the retailer bears the collection responsibility, and the drop shipper avoids liability by accepting a resale certificate from the retailer.5Streamlined Sales Tax Governing Board. Drop Shipments Issue Paper In the remaining 13 states, the drop shipper is treated as the retailer for tax purposes and must collect on the transaction, sometimes at the retail price and sometimes at the wholesale price.
Here’s the trap: none of those 13 states let the drop shipper accept a resale certificate from the retailer unless the retailer is registered in that specific state.5Streamlined Sales Tax Governing Board. Drop Shipments Issue Paper Sellers who assume their resale certificate works everywhere create unexpected tax liabilities for their drop-shipping partners.
What Happens If You Get Sourcing Wrong
Collecting at the wrong rate doesn’t just mean paying the difference. Penalties and interest stack on top. States typically impose a percentage-based penalty on underpaid sales tax, commonly in the range of 5% to 25% of the amount due, with monthly interest that keeps accruing until the balance is paid. Some states also charge minimum penalties on late-filed returns even when no tax is due.
Intent doesn’t matter to the assessment. The business is liable for the undercollected amount regardless of why the error happened. Over years of transactions, small rate errors compound into substantial bills. Audit lookback periods cover three to four years of returns in most states, and some reach four to five.6Multistate Tax Commission. Lookback Period Chart When an auditor finds systematic miscollection, the assessment covers every affected transaction in that window.
Voluntary Disclosure Agreements
If you discover you should have been collecting tax in a state and weren’t, a voluntary disclosure agreement can cut the damage. Most states offer these programs. They typically involve a shortened lookback of three to four years instead of the full statute of limitations.6Multistate Tax Commission. Lookback Period Chart In exchange for registering, filing back returns, and paying the tax and interest, the state waives some or all penalties.
Eligibility hinges on coming forward first. If you’re already under audit or have received any kind of notice, voluntary disclosure is off the table. Many states let you stay anonymous through a representative while negotiating terms, which protects you if the agreement falls through. The Multistate Tax Commission coordinates voluntary disclosure applications across participating states through a single entry point.
One timing mistake will disqualify you: filing returns or making payments before finalizing the agreement. Contact the state’s voluntary disclosure office or the MTC first, then wait for a signed agreement before submitting anything. Acting too quickly out of anxiety is the fastest way to lose the penalty waiver you’d otherwise get.