U.S. Sales Tax Guide
Sales tax isn’t exactly what gets ecommerce founders excited, but it's a necessary part of doing business in the U.S.
With the complexity of sales tax in U.S. states, especially for online retailers who sell across the country, staying compliant can feel overwhelming. However, navigating these regulations doesn’t have to be a headache.
This guide will break down U.S. sales tax essentials, why understanding nexus is crucial, and how Swap Commerce can help you manage it all.
What is U.S. Sales Tax?
At its core, U.S. sales tax is a consumption tax applied to the sale of goods and services.
Unlike other consumption tax systems, such as VAT, U.S. sales tax is not listed within the product price and is usually added at the point of sale.
While the federal government doesn’t impose a national sales tax, each of the 50 states has the authority to set its own sales tax rate and collect taxes from businesses operating within their borders.
This means that sales tax in U.S. states isn’t uniform, and each state has different rules, rates, and thresholds that apply to ecommerce businesses.
What is State Sales Tax?
State sales tax is a tax imposed by individual states on goods and services sold within their borders.
Each state sets its own sales tax rate and determines which goods and services are taxable.
Ecommerce businesses must collect state sales tax if they have nexus in the state, whether through physical presence or meeting economic nexus thresholds.
What is Local Sales Tax?
Local sales tax is an additional tax imposed by counties, cities, or districts, on top of the state sales tax.
This tax rate can vary widely by location, meaning the total sales tax a business collects may differ depending on the customer’s address.
Ecommerce businesses must track and apply local sales tax rates to ensure accurate tax collection and remittance.

How Does U.S. Sales Tax Work?
If you’re selling across state lines or internationally, understanding how U.S. states' sales tax operates is critical for compliance and ensuring you’re charging the correct rates.
Depending on the state, sales tax may apply to different types of goods or services, and the tax rate can vary greatly.
As an online retailer, it's essential to track these variations to ensure you're charging the correct sales tax at checkout and remitting it properly to the correct tax authorities.
How U.S. States Set Sales Tax Rates
Every state has its own approach to sales tax rates, with some states applying tax on a wide variety of goods and services and others exempting certain items.
Additionally, local jurisdictions (counties, cities) often add their own taxes, making the sales tax U.S. system even more complicated.
The rates you need to charge are based on where your customer is located, not where your business operates.
On the other hand, Delaware has no sales tax, making it a favorable state for businesses.
The variation between sales tax US states is why tracking and collecting the right sales tax is a complex but necessary process for ecommerce retailers.
Economic Nexus: The Wayfair Case
One of the biggest changes in U.S. ecommerce sales tax occurred in 2018 when the South Dakota v. Wayfair Supreme Court decision shifted the landscape.
Before this case, businesses only needed to collect sales tax in states where they had a physical presence.
But the Wayfair ruling made it clear that economic nexus also applies.
This means that if your sales exceed a certain threshold, typically $100,000 in sales or 200 transactions annually, you’re required to collect and remit sales tax in that state, even if you don’t have a physical location there.
This change in nexus tax laws dramatically increased the number of states where ecommerce businesses need to be sales tax compliant, even if they’re just shipping products across the country.
The economic nexus laws in U.S. states have shifted the responsibility for sales tax collection from just businesses with physical presence to any business with significant sales activity in a state.
Average U.S. Sales Tax and What It Means for Ecommerce
U.S. sales tax rates vary greatly across the country, but generally sit within the 2.9% to 7.25% range at state level.
This means that ecommerce businesses need to stay on top of their sales tax US obligations to ensure they are collecting the right amount.
Additionally, businesses must account for local taxes that might apply in certain cities and counties.
Understanding the average sales tax and how it affects your ecommerce business is critical for pricing, customer satisfaction, and ensuring compliance with sales tax in U.S. states.
With accurate sales tax automation, you can save time and money by ensuring compliance without manually calculating tax for each state.
Which U.S. States Have the Highest Sales Tax?
Several U.S. states have high sales tax rates, which can significantly affect both businesses and consumers.
California has one of the highest sales tax rates in the country, with a base state rate of 7.25%, but local taxes in some cities push the total rate as high as 11.25%.
Other states with high sales tax rates include Tennessee, which has a state rate of 7.00%, and Arkansas, where the base rate is 6.50% but local taxes can bring it much higher.
These states, along with others like Louisiana and Alabama, are known for having high sales tax rates, which ecommerce businesses must account for when calculating and remitting tax.
Which U.S. States Have the Lowest Sales Tax?
Some U.S. states have no sales tax at all, making them particularly attractive for ecommerce businesses. States like Delaware, Montana, New Hampshire, and Oregon do not charge state sales tax on purchases.
Other states, like Alaska, have no statewide sales tax, though some local jurisdictions may impose taxes.
These states offer a significant advantage to online retailers, as they are not required to collect sales tax from customers located within these states.
The difference between sales tax US states highlights why tracking nexus and understanding state-specific rules are essential for staying compliant and profitable.
With Swap Commerce’s ecommerce sales tax platform, tracking tax obligations across different states becomes a seamless process, reducing the complexity of managing varying tax rates.
What Should Businesses Do if They Meet the Sales Tax Nexus Threshold?
Once an ecommerce business meets the threshold for economic nexus in a state or jurisdiction, the next step is to register with the state’s tax authority to begin collecting sales tax.
This is a critical step in ensuring compliance with local laws. Businesses must not collect taxes until they have properly registered with the applicable jurisdiction.
Each state has its own registration requirements and deadlines, so it’s essential for businesses to be aware of these differences.
Sales tax rules can also vary based on the type of product being sold. Ecommerce businesses must understand whether their goods or services are taxable, especially when dealing with physical goods, digital products, or Software as a Service (SaaS).
It’s important for businesses to understand these nuances to ensure they’re collecting and remitting sales tax accurately.
States may have specific definitions for what constitutes a taxable product, so being familiar with local rules can help avoid misclassifying taxable items.
How Ecommerce Brands Become Compliant with U.S. Sales Tax
Managing sales tax compliance can be a significant challenge for ecommerce businesses, especially when selling across multiple states.
The complexity of tracking nexus in different states, staying updated on tax rate changes, and ensuring timely filings can become overwhelming.
Without the right tools, you risk undercharging or overcharging customers, both of which can lead to compliance issues and loss of trust.
Plus, failing to file taxes on time can result in penalties and fines. This is where automation comes in, it helps you manage sales tax US obligations with ease.

Best Practices for Managing Sales Tax Across U.S. States
To ensure you’re managing sales tax correctly, follow these best practices:
- Track Nexus in Every State: Stay updated on where you have nexus to ensure you’re collecting and remitting sales tax in the right places.
- Automate Sales Tax Calculation: Use tools that automatically calculate the correct tax rate based on the customer’s location, including any local taxes.
- Stay On-Time with Filings: Automate the filing process to ensure that sales tax returns are submitted on time, avoiding penalties.
- Quantify Tax Exposure: Regularly assess your tax exposure to understand your sales tax liabilities across different states and jurisdictions, helping to avoid unexpected tax burdens.
- Check Jurisdiction: Verify the jurisdiction (state, county, or city) where sales tax applies to ensure that you're applying the right rates, as local taxes can vary greatly.
- Understand Where to Register & Collect Taxes: Ensure that you are properly registered in every state or jurisdiction where you have nexus and are required to collect sales tax. Knowing where you need to register and collect taxes helps streamline your compliance efforts.
Using Swap Commerce’s automated sales tax solutions, ecommerce retailers can easily track nexus, calculate the correct tax, and file returns on time.
Swap’s all-in-one platform simplifies this complex process and keeps your business compliant across U.S. states.
How Swap Commerce Can Help
Tracking sales tax in U.S. states, filing returns, and staying compliant with nexus laws can be a daunting task for ecommerce retailers. That’s where Swap Commerce comes in.
Swap’s automated sales tax solutions help you manage sales tax US states with ease.
From nexus monitoring across all 50 states to one-click tax registration and audit-ready reports, Swap’s platform is designed to simplify your sales tax process, letting you focus on what really matters - growing your business.
Ready to simplify your U.S. sales tax compliance?
Book a demo today and discover how Swap can handle your U.S. ecommerce sales tax needs.
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