Sales Tax vs VAT: A Plain-English Guide for Online Sellers

The first time you sell to someone in another country, a question appears that most store owners have never had to think about: who collects the tax, and how much? Sales tax and VAT are two different systems, and mixing them up is easy. This guide explains the basic difference in plain English, so you know what to ask and where to look. It is a map, not a tax return. The details depend on your business, and they change.

The one-line difference

Sales tax is added at the very end, when the final customer buys. VAT, short for value-added tax, is collected at every step along the way, but in the end the customer pays it, and businesses mostly just pass it on to the tax authority.

To a shopper, though, the main difference is what they see. In the US, the price on a product page is usually shown without tax and sales tax is added at checkout. In the UK and Europe, shoppers normally expect the price on the page to already include VAT.

How sales tax works in the United States

There is no single national sales tax in the US. It is set by individual states, and often there are extra local taxes on top, so two customers in the same state can pay slightly different amounts. Some states do not have a general sales tax at all.

For an online seller, the big question is where you have to collect it. Businesses often owe sales tax in states where they have a physical presence, such as an office or a warehouse. Many states also expect sellers to collect tax once they pass a certain amount of sales or number of orders there, even without a physical presence. The thresholds and rules differ from state to state, and what is taxable also varies. Clothing, food and digital goods, for example, are treated differently in different places.

The practical result is that a store selling across the US may need to register in several states, collect the right tax at checkout and file returns. Many sellers use tax tools or accountants for exactly this reason.

How VAT works in the UK and Europe

VAT applies in the UK and in European Union countries, but each country sets its own rates, and some products have reduced rates. Businesses register for VAT once their sales pass a certain level, though in some cross-border cases there is no such threshold, and the rules have changed in recent years.

When a VAT-registered business sells to a consumer, it charges VAT on the sale, and the price shown normally includes it. The business then reports what it charged, subtracts the VAT it paid on its own purchases, and pays the difference to the authorities.

If you sell from outside the UK or the EU to customers there, VAT often still applies, and in many cases it needs to be collected at the point of sale instead of being left for the customer to deal with at the border. The EU also has a scheme that lets sellers report VAT for several EU countries in one place, rather than registering in each one. Rules on low-value parcels have also been tightened in both the UK and the EU, so old advice you may read online can be out of date.

And Canada?

Canada adds its own flavour. There is a federal goods and services tax (GST), some provinces use a combined harmonized tax (HST), and others add a provincial sales tax on top. Which one applies depends on where the customer is. If you sell into Canada, check how the rules apply to a business based abroad.

Prices: with tax or without?

This affects how your store looks, and it is worth getting right:

• US shoppers expect to see a price before tax, with tax added in the cart.
• UK and EU shoppers expect the price to include VAT, and they notice when it does not.
• Mixed stores need settings that show the right style for each market. Shopify, for example, has options for tax-inclusive pricing and lets you set different rules for different regions.

Whatever you choose, make it clear. The final price at checkout should not be a nasty surprise.

Duties are a separate thing

Taxes like sales tax and VAT are different from import duties, which are charged by the destination country when goods cross a border. A parcel can attract duties and tax at the same time. Some stores collect these at checkout so the customer pays nothing extra on delivery, others leave the customer to pay when it arrives. If you do the second, say so clearly, because surprise bills are one of the quickest ways to lose a customer.

What a store owner should actually do

You do not need to become a tax expert, but a few steps help a lot:

• List the countries (and US states) you really sell to. Do not guess; check your orders.
• Find out where you may need to register. This is the part where an accountant earns their fee.
• Set up tax collection in your store. Most platforms can calculate and add tax automatically once you give them the right settings.
• Show prices the way each market expects.
• Keep good records. Orders, tax collected, invoices and any registrations.
• Review once or twice a year. Rules change, and so does your business.

Common mistakes

Assuming tax only matters in your home country. Showing UK prices without VAT and then adding it at the end. Ignoring small sales until they add up. Relying on advice that is several years old. And trying to work it all out alone when a short conversation with a professional would save a lot of worry.

Where to get proper answers

For anything specific, speak to a qualified accountant or tax adviser who understands e-commerce and the countries you sell to, and check the official guidance published by each tax authority. Platforms like Shopify also publish help pages on how their tax settings work, which are useful for the practical side.

If you would like help with the store side

We help online brands set up and manage their stores for customers in the US, UK, Canada and Europe, from product pages and pricing display to the day-to-day running of the store. If you would like to talk it through, you are welcome to book a free consultation. This article is general information, not legal, tax or financial advice, and the rules vary by country and change over time.