Sales Tax for Beginners: What You Need to Know

Sales tax isn’t the most exciting part of running a business—but ignoring it can lead to stress, penalties, or even legal trouble.

If you’re just starting out, especially selling products online, it’s easy to assume sales tax doesn’t apply to you.
But it probably does—and the rules can be confusing if you’re not prepared.

Here’s a simple breakdown of what you need to know about sales tax (without getting lost in technicalities).

1. What is sales tax, really?

Sales tax is a state-imposed tax on the sale of certain goods and services.
When someone buys a taxable product, you (the seller) collect the tax on the state’s behalf—then send it to the government.

It’s not part of your income. You’re just holding it temporarily.

2. Do all businesses have to collect sales tax?

Not always. It depends on:

• What you sell
• Where your customers live
• Where your business is based
• Where you have “nexus” (we’ll explain that next)

Generally:

• Physical products? Almost always taxable.
• Digital products? Varies by state.
• Services? Often tax-free, but not always.

Check your state’s rules—or use a tool like TaxJar or Avalara to simplify the process.

3. What is “nexus”?

Nexus means a connection between your business and a state.
If you have nexus in a state, you may need to collect sales tax from buyers in that state.

You can have nexus if you:

• Have a physical presence (office, warehouse, employee)
• Sell above a certain threshold (often $100K in sales or 200+ transactions per year)
• Store inventory (even with third-party fulfillment like Amazon)

This is why even online sellers need to pay attention—especially if you sell nationwide.

4. How do you start collecting sales tax?

If you have nexus in a state:

1. Register for a sales tax permit with that state’s revenue department
2. Add sales tax collection to your checkout process (most e-commerce platforms have built-in tools)
3. Track what you collect—you’ll need to report it regularly (monthly, quarterly, or yearly)

Don’t start collecting tax until you’re registered. In most states, that’s illegal.

5. What if you sell digital products?

This gets tricky. Some states tax digital goods (like eBooks or courses), and some don’t.

A few examples:

• Taxable: New York, Pennsylvania, Washington
• Not taxable: California, Texas (in most cases)

You’ll need to check the rules where your customers live—not just your own state.

If in doubt, consult a CPA or use automated software to keep you compliant.

6. Keep it simple with software

Manually tracking all this is a headache. Luckily, tools like:

• TaxJar
• Quaderno
• Avalara
• Shopify Tax (built-in for store owners)

…can help you:

• Auto-calculate tax at checkout
• File returns
• Track where you owe and when

These tools aren’t free—but they’re worth the peace of mind.

Action Step
Make a list of the states where you sell the most. Then check if you have sales tax nexus in any of them. If yes, register for a sales tax permit, and set up your platform to collect tax at checkout. Start simple—but stay compliant.