What it is

Sourcing is the rule that decides which jurisdiction’s sales tax rate applies to a given sale. There are two main flavors. Origin-based sourcing sources the sale to the seller’s location — the warehouse, store, or address the package ships from — so you charge the rate at your own location. Destination-based sourcing sources the sale to the buyer’s location, so you charge the rate where the customer receives the item. <!– src: https://www.taxjar.com/sales-tax/origin-based-and-destination-based-sales-tax –>

Most U.S. states, plus Washington, D.C., are destination-based. A smaller group applies origin-based rules — but, importantly, only for intrastate sales, meaning sales where the item ships from and is delivered to an address in the same state. <!– src: https://www.taxjar.com/sales-tax/origin-based-and-destination-based-sales-tax –>

The critical catch for multi-state sellers: when the sale crosses state lines and you’re a remote seller in the destination state, that state almost always wants you to charge the buyer’s destination rate — even if your home state is origin-based. In TaxJar’s words, “if you are considered a ‘remote seller’ in a state, that state wants you to charge the sales tax rate at your buyer’s destination.” <!– src: https://www.taxjar.com/sales-tax/origin-based-and-destination-based-sales-tax –>

Why it matters to a multi-state seller

Sourcing determines the exact rate you collect, and getting it wrong is a quiet, recurring error. Under-collect and you owe the difference out of your own pocket at audit; over-collect and you’ve overcharged customers and created a refund liability. Because U.S. rates combine state, county, city, and special-district taxes, two addresses a few miles apart can carry different totals.

For interstate e-commerce the practical rule is simpler than it sounds: once you have economic nexus in a state and register there as a remote seller, you generally collect at the destination (your customer’s address) rate. Origin sourcing mostly affects sellers with a physical location making sales within their own state — a Texas store shipping to a Texas customer charges based on its Texas origin location, but shipping to an Oklahoma customer it charges Oklahoma’s destination rate. That’s why most sales-tax automation defaults to destination rate lookups: across the bulk of interstate orders, the buyer’s location controls.

Worked example

Say your business operates a warehouse in Dallas, Texas.

• Texas customer (intrastate): Texas is origin-based for intrastate sales, so you charge the rate at your Dallas ship-from location — regardless of where in Texas the buyer is. <!– src: https://www.taxjar.com/sales-tax/origin-based-and-destination-based-sales-tax –>
• Colorado customer (interstate): Colorado is destination-based and you’re a remote seller there, so you charge the rate at the buyer’s Colorado address — state plus their county, city, and special districts. <!– src: https://www.taxjar.com/sales-tax/origin-based-and-destination-based-sales-tax –>

Two customers, two sourcing outcomes — driven entirely by where each one is and whether the sale stayed in-state.

State-level nuance

A handful of states use origin-based sourcing for intrastate sales. The list below reflects the states most commonly identified as origin-based; California is treated specially because it mixes both approaches.

Two cautions. First, this list applies to intrastate sales only — for interstate/remote sales, even these states generally expect destination-based collection. Second, sourcing rules can shift and some states have nuances like flat use-tax options for remote sellers. Always confirm against the specific state’s Department of Revenue.

How this connects to staying compliant

Sourcing is the bridge between having nexus and charging the right amount. The workflow: (1) determine where you have economic nexus and register, (2) apply each state’s sourcing rule — destination for nearly all interstate sales, origin for certain intrastate sales — and (3) collect that combined rate and report it on your return. Many states require collections broken out by jurisdiction, so accurate sourcing is also what makes filing possible.

Sources: TaxJar — Origin-based and destination-based sales tax rates (state list, interstate rule, California hybrid): https://www.taxjar.com/sales-tax/origin-based-and-destination-based-sales-tax Avalara — Origin sales tax vs. destination sales tax: https://www.avalara.com/us/en/learn/whitepapers/origin-vs-destination-sales-tax.html Avalara — U.S. states with origin sourcing or special sourcing rules: https://knowledge.avalara.com/bundle/dqa1657870670369_dqa1657870670369/page/U.S._states_with_origin_sourcing_or_special_sourcing_rules.html