Rules Cluster
US Sales Tax Rules
Direct Answer
US sales tax rules explain when tax applies, who must collect it, where the sale is sourced, which rate is used, and whether exemptions change the outcome. These concepts sit behind the calculator and determine whether the calculated rate should be collected.
Instant Calculator
Calculate Sales Tax
Los Angeles, California combined rate
9.5%
Example ZIP-level estimate for Los Angeles, California.
- State tax
- $7.25
- Local tax
- $2.25
- Total tax
- $9.50
- Final amount
- $109.50
Rule Framework
Nexus
Does the seller have enough connection to the state to collect tax?
Taxability
Is the product, service, digital good, or bundle taxable in that state?
Sourcing
Which location decides the state and local rate?
Exemptions
Does the buyer, use case, certificate, or item category change collection?
Concepts Behind The Calculator
A sales tax calculator can multiply an amount by a rate, but rules decide whether that rate should be used. Local jurisdiction rates, destination sourcing, exempt buyers, product categories, tax holidays, and marketplace collection can all change the transaction before the math happens.
Common Exceptions
- Groceries, medicines, clothing, software, and services can receive different treatment by state.
- Resale and exemption certificates can change whether tax is collected from the buyer.
- Tax holidays may temporarily change taxability for specific products or purchase dates.
- Marketplace facilitator laws can shift collection responsibility for marketplace orders.
FAQ
Sales Tax Questions
What are sales tax rules?+
Sales tax rules define taxable products, collection obligations, sourcing method, exemptions, local rates, documentation, and remittance responsibilities.
What is sales tax sourcing?+
Sourcing determines which location controls the tax rate. Depending on the state and transaction, that can be the seller location, buyer destination, or another defined place of sale.
How do exemptions affect sales tax?+
Exemptions can remove or reduce tax for certain products, buyers, uses, or resale transactions, usually with documentation requirements.
What is product taxability?+
Product taxability determines whether a specific item or service is taxable, exempt, reduced-rate, or subject to special rules in a state.
What is an exemption certificate?+
An exemption certificate is documentation a buyer gives a seller to support a tax-exempt purchase, such as resale, nonprofit, or government use.
Are services taxable?+
Services may be taxable, exempt, or partially taxable depending on the state and service category.
What is destination-based sales tax?+
Destination-based sales tax uses the buyer delivery or use location to determine the rate, which is common for shipped orders in many states.
What is origin-based sales tax?+
Origin-based sales tax uses the seller or sale location to determine the rate for certain transactions, depending on the state.
Do tax holidays change sales tax rules?+
Yes. Tax holidays can temporarily exempt specific products, price ranges, or dates, so sellers should treat them as rule exceptions.
Related Tools
Use these pages to verify rate logic, ZIP accuracy, ecommerce obligations, and state-level data before relying on an estimate.