US Sales Tax Made Simple for Ecommerce Businesses

Get support filing American sales tax and knowing whether you’ve crossed sales tax nexus
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The United States of America
Currency United States Dollar (USD, $)
Largest Marketplace (by page visits) Amazon.com
Most Popular Product Category Fashion
Tax Authority Internal Revenue Service (IRS)

Make it Simpler to Sell to the US

US Sales Tax is one of the most complicated tax systems that an ecommerce brand will have to engage with. Each of the fifty states (and Washington D.C) decides:
  • What their sales tax rates are
  • At which point you need to register (sales tax nexus)
  • Which products are taxable (and at which rate)
  • How often you have to file a sales tax return
Some states don’t even have a state-wide sales tax, but individual districts within those states do.
AVASK US are here to make it simpler. Talk to them about your business - what you sell, which channels you use. They’ll let you know what you need to do and help you do it.

Sales Tax Nexus

You’ll need to register for US sales tax when you’ve reached sales tax nexus.
There are two kinds: Physical nexus and Economic nexus.
Physical nexus
Generally speaking, you reach physical nexus when you have a tangible presence in the state. That could be owning a distribution centre or having employees there. The most common reason ecommerce sellers reach physical nexus is holding stock in a state.
Economic nexus
Economic nexus is a threshold in either revenue or transaction volume that each state sets. Typically, you’ll need to register one you hit either $100,000 in sales or 200 transactions in a single calendar year.
Every state is different and reaching sales tax nexus isn’t the only reason you might need to register. We’re here to make it simpler to know if you’ve reached nexus or are about to. The team of Certified Public Accountants (CPAs) at AVASK US will keep an eye on your sales data to make sure you don’t trigger the need to register for US sales tax without knowing it.

Do UK Sellers Pay US Sales Tax?

Are you based in the UK and looking to sell to customers in the USA? Find out more about how US sales tax works for UK businesses in our blog: Do UK Sellers Pay US Sales Tax?
Headshot of Jovell Bailey, Head of US Operations at AVASK US
"The U.S. market presents a significant opportunity for international sellers, but navigating sales tax can often seem complex. Our goal is to simplify that process entirely! From registration through ongoing compliances so our clients can focus on growing their business with confidence.”
Jovell Bailey, Head of US Operations at AVASK US

Get an EIN Number

You’ll need an Employer Identification (EIN) number to get registered for US sales tax. If you’re thinking of selling your product in the United States, AVASK US will help you apply to the IRS for an EIN number, as part of getting you set up for Sales Tax.
Start Selling in the USA

Sell in the United States on Amazon

The United States is Amazon’s home and its biggest market. Amazon saw roughly $440 billion in sales in 2025, accounting for 35.7% of all ecommerce in the United States.

In most US states, Amazon is recognised as a Marketplace Facilitator. That means they’re responsible for handling the sales tax for you. However, some still require you to register, even if Amazon is your only sales channel.

Don’t let sales tax complications stop you from taking advantage of the world’s largest digital marketplace. AVASK US can make it simple.

Tell us about your business

US Sales Tax for Shopify Sellers

Selling on a channel you own means you can avoid the fees charged by marketplaces like Amazon or Walmart. The flipside is that you’re responsible for managing the sales tax on sales to customers in the United States.

If you’re selling on Shopify to the United States, you’ll need to register for Sales Tax in two instances:

• When you store goods in a US state (physical nexus)
• When you reach economic nexus in a state

AVASK US can help you get registered and monitor your US sales, so you don’t trigger additional registrations without knowing it.
Get in touch

Get Started with US Sales Tax

Fill out the form below and you’ll hear back from AVASK US

Sales Tax FAQs

How do I get an EORI number?

We can get you an EORI number and help you decide which country you should register in. We’ll need some details about your business, so book a call and we’ll get things started.

How do I get an EORI number
What’s the cost of an EORI number?
EORI number processing time:

We can get you an EORI number and help you decide which country you should register in. We’ll need some details about your business, so book a call and we’ll get things started.

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Absolutely! You can always deregister from any state once you stop selling. In fact, it's a requirement.
The processing time for a sales tax application varies by state. If there aren't any delays, it usually takes approximately 4-6 weeks.
In most cases, you don’t need a US entity to register for sales tax. However, you’ll definitely need an Employer Identification Number (EIN), which AVASK US can assist with.
No, you don’t need to register until you’ve hit nexus, which varies by state. This also varies based on the platform that you sell on, for example, Amazon and other Marketplace Facilitator doesn’t require sellers to be registered in every state.
If you cross an economic nexus threshold in the middle of the year, you’ll need to register for sales tax in that state. Once you’re registered, you’ll need to start charging and remitting sales tax in that state.
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