US State Sales Tax Guide: Nexus, Rates and Compliance

State sales tax is one of the most important—and confusing—taxes US businesses must deal with, because each state (and many cities/counties) sets its own rates, rules, and filing requirements.

Once you understand the basics of how state sales tax works, what triggers collection obligations, and where to find reliable state‑by‑state information, staying compliant becomes much more manageable.

1. What state sales tax is (and isn’t)

There is no federal sales tax in the United States; instead, sales tax is imposed at the state and local level. State sales tax is generally a consumption tax charged on the sale of tangible goods and some services, and it’s usually collected by the seller at the point of sale and remitted to state and local tax authorities.

Key points:

• State legislatures decide what’s taxable, what’s exempt, and the state base rate.
• Cities, counties, and special districts can often add their own local rates on top of the state rate.
• Some states (for example, Delaware, Montana, New Hampshire, and Oregon) have no statewide sales tax, while others like Tennessee and Louisiana have some of the highest combined state and local rates (around 9.5%).​

For a beginner‑friendly overview, see What is sales tax? A complete guide by TaxJar and Finally’s Sales Tax Basics: A Comprehensive Guide for Businesses, both of which explain how state and local sales tax systems work in simple terms.

If you want a more technical reference, the Wikipedia article Sales taxes in the United States provides historical context, rate structures, and a comparison to other types of consumption taxes.​

2. How state sales tax rates work

Every state that imposes sales tax sets a base rate, and many allow local governments to levy additional taxes. The total rate a customer pays is the sum of state and applicable local rates at the location where the sale is sourced.

Patriot Software’s Sales Tax Laws by State guide provides a handy table of 2023 state sales tax rates, typical local rate ranges, and whether each state uses an origin‑based or destination‑based sales tax method. For example:​

• California’s state rate is 7.25%, with local rates up to 3.25%, and uses a hybrid origin/destination system.
• Texas has a 6.25% state rate, with local rates up to 2%, and is generally origin‑based.
• Many states (e.g., New York, Florida, Washington) use destination‑based sourcing.

Patriot’s table also includes Alaska, Delaware, Montana, New Hampshire, and Oregon as states without a statewide sales tax (though Alaska allows some local sales taxes). The guide also notes that both rates and laws change frequently and advises checking state websites or updated tables each year.

For an example of how specific states handle sales tax in practice, Pipedrive’s US Sales Tax Guide by State: PA, NJ, NYS, CO & TN Explained walks through how five major states set rates, exemptions, filing deadlines, and nexus rules.​

3. What’s taxable: goods, services, and exemptions

Unlike VAT systems, US state sales taxes often apply only to certain categories of goods and services, and the rules vary widely by state.

General patterns:

• Tangible personal property (physical goods like furniture, electronics, clothing) is usually taxable unless specifically exempt.
• Groceries and prescription drugs may be fully exempt, taxed at a reduced rate, or taxed at the standard rate depending on the state.
• Services are often exempt by default in many states, but some tax specific services (telecom, digital goods, SaaS, professional services, installation, repair, etc.).

Avalara’s State‑by‑state guide to charging sales tax on services explains which service categories are taxable in each state and notes that “every state taxes services in its own way,” making local research critical.​

TaxJar’s What is sales tax? guide also outlines common exemptions, such as sales for resale (with a resale certificate), non‑profit exemptions, and exemptions for manufacturing equipment or agricultural products in some states.​

4. Sales tax nexus: when you must collect in a state

You only have to collect and remit sales tax in a state where you have nexus—a sufficient connection to that state under its laws.

Nexus triggers can include:

• Physical presence – an office, store, warehouse, inventory, or employees in the state.
• Economic nexus – exceeding a certain threshold of sales or transactions into the state (for example, 100,000 dollars in sales or 200 transactions in a year, though thresholds vary by state).
• Affiliate or click‑through nexus – relationships with in‑state affiliates or referral partners.
• Marketplace nexus – rules that shift collection responsibilities to marketplaces like Amazon or require marketplace sellers to comply in specific ways.

Stripe’s Introduction to US sales tax and economic nexus offers a clear overview of how economic nexus works post‑Wayfair and includes examples of common thresholds and compliance steps. The US Chamber of Commerce’s article Sales Tax Nexus Explained: Do You Need to Collect and Remit? defines sales tax nexus as the presence that creates an obligation to collect and remit, and emphasises that once you cross a state’s threshold you must register, collect, and remit taxes.

For a more detailed, small‑business‑friendly discussion, Xero’s Sales Tax Nexus Rules: Multi‑State Compliance Guide spells out physical vs economic nexus, marketplace nexus, and compliance implications when you sell into multiple states. Stripe also offers a technical overview in A guide to nexus and sales tax nexus, which details how physical, economic, affiliate, and click‑through factors create obligations.

5. Registration, collection, and filing

Once you have nexus in a state, you typically must:

1. Register for a sales tax permit with that state’s department of revenue before collecting tax.
2. Collect sales tax from customers on taxable sales at the correct state + local rate.
3. File periodic returns (monthly, quarterly, or annually) and remit the collected tax.

TaxJar’s sales tax guide outlines the general process for registration, collection, reporting, and remittance, including how to determine filing frequency based on state notices. Finally’s Sales Tax Basics similarly emphasises that collection without registration can be illegal, and that you must track each state’s deadlines to avoid penalties.

For multi‑state sellers, Xero’s nexus guide explains that each state’s registration and filing process is separate, but you can use software and automation to manage rates, calculations, and filings.​

6. Streamlined Sales Tax (SST) and simplification efforts

To reduce compliance burdens (especially for remote sellers), a group of states created the Streamlined Sales and Use Tax Agreement (SSUTA) and formed the Streamlined Sales Tax Governing Board.

The Streamlined Sales Tax Governing Board coordinates simplification efforts among its member states, which include uniform definitions of taxable items, centralised registration, and optional certified service providers to handle calculation and filing. The SSUTA aims to:

• Standardise key definitions and sourcing rules.
• Provide a centralized registration system so remote sellers can register in all member states at once (SSTR).
• Offer free or subsidised sales tax calculation and filing tools for qualifying remote sellers.

TaxJar’s article Streamlined Sales Tax (SST): Benefits and potential risks to consider discusses how SST can make compliance easier but also notes potential trade‑offs, such as the need to adhere to SSUTA requirements and the fact that not all states participate.​

The SST site’s about/governing board section explains that member states must comply with the SSUTA to join, and it outlines how the board and its advisory councils (including a Business Advisory Council) develop definitions, rules, and interpretations.

7. Origin vs destination sourcing and remote sales

States generally use either origin‑based or destination‑based sourcing to determine which local rate applies to a sale, and this can drastically affect your compliance approach.

• Origin‑based states (like Texas or Ohio) generally require you to charge tax based on the seller’s location for in‑state sales.​
• Destination‑based states (like New York or Washington) tax based on the customer’s ship‑to or service location.
• Some states (like California) use a hybrid approach, with state and some local taxes origin‑based and certain district taxes destination‑based.​

Patriot Software’s state‑by‑state chart clearly labels each state as origin‑based, destination‑based, or hybrid and provides 2023 rate ranges. Xero’s nexus guide explains that remote sellers typically follow destination‑based rules in states where they have only economic nexus, which requires robust address and rate lookups.

8. Sales tax compliance challenges for growing businesses

For many small and growing businesses, the hardest part of state sales tax is not the rate itself but the complexity and change.

Common challenges:

• Tracking evolving economic nexus thresholds and marketplace rules across dozens of states.
• Knowing which products and services are taxable vs exempt in each state.
• Managing origin vs destination sourcing rules for in‑state and cross‑state sales.
• Keeping up with rate changes at the state, county, city, and special district levels.
• Filing accurate returns on time in multiple states, each with its own portal and format.

Stripe’s Introduction to US sales tax and economic nexus notes that many businesses underestimate how quickly they can cross thresholds when selling online, and emphasises the need for systems that track sales by state and automate tax calculations.​

TaxJar’s sales tax guide and the Sales Tax Basics article from Finally both highlight that manual rate lookups and spreadsheets become risky as your volume and geographic reach increase, recommending sales tax automation tools once you sell into multiple states.

Sales.Tax’s What is Sales Tax? A Complete Guide for Beginners (a third‑party guide) covers essentials like tax rates, nexus rules, and management strategies for growing businesses, making it a good primer if you’re just starting to consider multi‑state sales.​

9. Practical steps to stay compliant

To manage state sales tax effectively, build a repeatable process:

1. Identify where you have nexus
   • Review physical presence (offices, warehouses, employees, inventory).
   • Track sales and transaction counts by state to see where you cross economic nexus thresholds.
   • Use guides like Stripe’s economic nexus overview and Xero’s nexus rules guide to understand each state’s triggers.
2. Register in each nexus state
   • Apply for sales tax permits through each state’s revenue department (many have online portals).
   • Consider using the Streamlined Sales Tax registration system if you sell into SST member states.
3. Configure your tax engine
   • Set up your POS, e‑commerce platform, or accounting software to apply the right state + local rates based on origin/destination rules.
   • Maintain accurate product and service taxability codes using references like Avalara’s state‑by‑state service taxability guide.​
4. File and remit on time
   • Note each state’s filing frequency and deadlines (monthly, quarterly, annually) from its registration notice.
   • Reconcile collected tax with your returns and remit via the state portals or SST systems.
5. Review annually
   • Reassess where you have nexus (new states, new channels, growth).
   • Check for rate changes and law updates, using up‑to‑date 50‑state resources like Patriot’s sales tax laws by state and other state‑by‑state guides.

10. Key external resources you should bookmark

To keep “State Sales Tax Explained” from becoming overwhelming, build a small but powerful resource stack:

• Basics and definitions
  • TaxJar – What is sales tax? A complete guide​
  • Finally – Sales Tax Basics: A Comprehensive Guide for Businesses​
  • Sales.Tax – What is Sales Tax? A Complete Guide for Beginners​
• Nexus and multi‑state compliance
  • Stripe – Introduction to US sales tax and economic nexus and A guide to nexus and sales tax nexus
  • Xero – Sales Tax Nexus Rules: Multi‑State Compliance Guide​
  • U.S. Chamber – Sales Tax Nexus Explained​
• State‑by‑state rules and rates
  • Patriot Software – Sales Tax Laws by State​
  • Avalara – State‑by‑state guide to charging sales tax on services​
  • Pipedrive – US Sales Tax Guide by State: PA, NJ, NYS, CO & TN Explained​
• Simplification and SST
  • Streamlined Sales Tax Governing Board – streamlinedsalestax.org​
  • TaxJar – Streamlined Sales Tax (SST): Benefits and potential risks to consider​

Using these resources alongside your state revenue departments gives you a solid, always‑updated foundation for understanding and managing state sales tax as your business grows across the US.