Do I Need to Collect Sales Tax? A Guide for Online Sellers (2026)

E-commerce sales tax collection guide for online sellers

TL;DR: Most online sellers need to collect sales tax if they exceed their state's economic nexus threshold—typically $100,000 in annual sales. However, rules vary significantly by state. Some states have no sales tax (NOMAD states), while others use lower thresholds. Marketplace facilitators like Amazon and eBay often collect sales tax on your behalf. You likely need to register immediately if you have a physical presence in a state or if you're close to the threshold. Use a free nexus calculator to determine your exact obligations, and consult with a tax professional for compliance.

The Simple Answer: It Depends (But Probably Yes)

The answer to "do I need to collect sales tax?" isn't one-size-fits-all. Your obligation depends on several factors: where you're selling, how much you're selling, where your customers are located, and the structure of your business. While this might sound complicated, understanding a few key principles will give you clarity.

The short version: If you're selling more than $100,000 worth of goods annually to customers in most U.S. states, you almost certainly need to collect and remit sales tax. But there are important exceptions, thresholds, and nuances that can affect your specific situation.

Understanding Economic Nexus: The Modern Sales Tax Rule

Economic nexus is the foundation of modern sales tax requirements for online sellers. This concept means you have a "connection" to a state based on your sales activity there, not just whether you have a physical office or warehouse.

Before 2018, the Supreme Court ruled that states could only require sales tax collection from sellers with physical presence—a store, warehouse, or employee in that state. The South Dakota v. Wayfair decision changed everything. Now, states can require tax collection based solely on sales volume, even if you have no physical presence there.

This was transformative for state tax revenue and fundamentally changed how online sellers operate. What makes it tricky is that each state set its own threshold and rules, creating a patchwork of requirements.

Key Term	Definition
Economic Nexus	Sales tax obligation based on exceeding a state's sales threshold, regardless of physical presence
Physical Nexus	Sales tax obligation based on having a location, employees, or assets in a state
Marketplace Facilitator	Third-party platform (Amazon, eBay, Shopify) that collects sales tax on behalf of sellers
NOMAD States	States with no sales tax (Nevada, Oregon, Montana, Alaska, Delaware)
Threshold	The sales amount you must exceed to trigger sales tax registration requirements

The $100,000 Threshold: The Most Common Rule

Most U.S. states use a $100,000 annual sales threshold as their economic nexus trigger. This means once your sales to customers in that state exceed $100,000 in a calendar year, you must register and collect sales tax in that state.

Here's how it works in practice: Let's say you're an online clothing retailer selling through your own website. If your annual sales to Texas customers total $125,000, you've exceeded Texas's threshold and must collect tax on those sales. You'd typically register immediately and begin collecting on future sales, sometimes going back to the date you exceeded the threshold.

The $100,000 threshold applies in over 30 states. However, some states are stricter. A handful require registration at $50,000 or less. Others still use transaction thresholds—for example, 200 transactions in a year—in addition to or instead of sales volume.

The key insight: Tracking your sales by state is essential. You need to know exactly when you'll hit these thresholds, not just your total sales overall.

The Other Thresholds: Know Your State-by-State Rules

While $100,000 is common, important variations exist:

Lower Thresholds:

Some states use $50,000 thresholds
A few states have thresholds as low as $30,000
Illinois notably uses $100,000 but also has a 200-transaction threshold

Transaction Thresholds: Many states pair their sales threshold with a transaction requirement. For example, you might need to register if you exceed $100,000 or 200 transactions—whichever comes first. This protects states from sellers who make one or two very large sales and then disappear.

Marketplace Facilitator Thresholds: When selling through Amazon or other marketplaces, different rules may apply. Many states exempt you from collection obligations if the marketplace collects for you (which they usually do).

The complexity here is real, but it's manageable. Most e-commerce platforms now include sales tax tools and dashboards that track your nexus obligations. Additionally, our free nexus calculator can help you determine which states require registration based on your sales data.

NOMAD States: No Sales Tax Required

Five U.S. states have no sales tax: Nevada, Oregon, Montana, Alaska, and Delaware. Sellers based in these states or selling to residents of these states have one major advantage—they don't need to collect state sales tax.

However, don't celebrate too early. Just because you're in a NOMAD state doesn't mean you're completely tax-exempt. Some local jurisdictions within these states may still have tax obligations, and you may still owe income tax to the state you operate from.

Additionally, selling to residents of NOMAD states doesn't mean you don't owe tax to other states. A seller in Nevada still must collect sales tax from customers in California, Texas, and any other state where they exceed the nexus threshold.

Marketplace Facilitators: Who Collects the Tax?

When you sell through marketplace facilitators like Amazon, eBay, Shopify, or Etsy, the tax collection situation is usually simplified—but with important caveats.

In most states, when you sell through these platforms, the marketplace is responsible for collecting and remitting sales tax. This is fantastic because it reduces your burden. You don't need to calculate tax rates, file returns, or send money to a dozen different states.

However, there's a critical catch: This only applies to the platform's direct sales. If you're using Shopify or WordPress to build your own store and handle payment processing yourself, you remain responsible for all sales tax compliance. Marketplace facilitator protection typically doesn't extend to sellers using their platform as a back-end tool but collecting payment independently.

Additionally, some states have special rules. A few require you to register and file returns even though the marketplace is collecting, though you're typically relieved of the collection obligation. You need to verify the rules in each state where you operate.

Pro tip: Check your marketplace seller center for a "tax compliance" or "tax settings" section. Most platforms detail their specific obligations by state and year.

When You Definitely Need to Register Immediately

Certain situations create immediate sales tax obligations, regardless of sales volume:

Physical Presence: If you have a warehouse, office, employee, or any physical location in a state, you must register for sales tax in that state. This has always been true and remains the most ironclad nexus trigger.

Inventory Stored in a State: If you use a fulfillment center or warehouse in any state, you have economic nexus there. This applies even if you only use the facility temporarily or seasonally.

Business License: Operating a business presence in a state (even if just maintaining business licenses) may trigger nexus.

Affiliate Relationships: Some states hold you responsible for sales made through affiliated referral partners in that state. If you have marketing affiliates in a state, check that state's affiliate nexus rules.

Drop Shipping: While drop shipping itself doesn't inherently trigger physical nexus, you still must track sales volume. If you exceed the threshold through drop shipping, you must register.

Practical Steps: How to Get Started with Compliance

Step 1: Calculate Your Sales by State

Begin tracking which states your customers are located in. Most e-commerce platforms provide analytics showing customer location by state or shipping address. Calculate your annual sales total for each state. This is your ground zero.

Step 2: Determine Your Specific Thresholds

Use our free nexus calculator or research the specific threshold in each state where you have sales. Make note of which states' thresholds you've exceeded.

Step 3: Assess Physical Presence

Do you have any physical presence in any state—even if minimal? This includes warehouse space, office, employees, inventory, or business registrations. Any physical presence = immediate nexus in that state.

Step 4: Research Marketplace Rules

If you sell through marketplaces, confirm whether they're collecting tax on your behalf. Review their tax compliance documentation. If they are, you may have reduced obligations (but still verify by state).

Step 5: Register in Required States

Once you've identified which states require registration, register with each state's sales tax authority. Most states offer online registration. Filing deadlines vary—some states require registration immediately, while others give you a grace period.

Step 6: Set Up Collection Systems

Configure your e-commerce platform to calculate and collect the correct sales tax rate for each jurisdiction. Tax rate tables are complex (some areas have local taxes stacked on state taxes), but good tax software handles this automatically.

Step 7: File Returns on Schedule

Once registered, you must file sales tax returns on your state's schedule—typically monthly, quarterly, or annually depending on your sales volume. Mark these deadlines in your calendar.

Common Scenarios: Real-World Examples

Scenario 1: $85,000 Annual Sales

You're a Texas-based seller with $85,000 in annual sales, spread across six states. Since you're below most states' $100,000 threshold, you likely don't have economic nexus obligations. However, verify by state—some use $50,000 thresholds. Since you're close to the $100,000 mark, you should monitor this closely and be prepared to register within months.

Scenario 2: $150,000 Sales to California, $30,000 to Other States

You've exceeded California's threshold ($100,000), so you must register and collect in California. You haven't exceeded thresholds in other states individually, so you're only collecting in California for now. This is a real situation many sellers face: they exceed the threshold in one large state but not others.

Scenario 3: Selling Through Amazon

You're a third-party seller on Amazon with $200,000 in annual sales. Amazon collects sales tax on your behalf in most states. You likely don't need to register independently in most states. However, verify Amazon's specific rules for any states where they don't collect, and check if your state requires filing even though Amazon collects.

Scenario 4: Fulfillment Center in New Jersey

You're based in New York but use a fulfillment center in New Jersey. You have immediate nexus in New Jersey regardless of your sales volume. You must register in New Jersey and collect sales tax. You'd also have nexus in New York if you have physical presence there.

How NexusMonitor Can Help You Stay Compliant

Staying on top of sales tax requirements is genuinely challenging without proper tools. NexusMonitor helps by:

Automatically tracking your sales by state and comparing against each state's threshold
Alerting you when you're approaching a nexus threshold so you can register proactively
Providing state-specific guidance on registration deadlines and forms
Helping you understand whether marketplace facilitator protections apply in your situation
Organizing your compliance calendar so you don't miss filing deadlines

The platform is designed for exactly the scenario you're likely facing: growing sales across multiple states and wondering whether you've crossed into compliance territory.

Important Caveats and Special Situations

Use Tax: Some states impose "use tax" on customers who purchase from out-of-state sellers. While you may not be required to collect this tax, your customers theoretically owe it. This is largely unenforced for B2C sales but worth understanding.

Exempt Sales: Some types of sales are tax-exempt (medical equipment, agricultural supplies, food, etc.). These exemptions vary dramatically by state. You might be collecting sales tax on items that shouldn't be taxed in a particular state.

Interstate Commerce Complications: If you're selling services or digital products, different rules may apply. Remote services and software as a service (SaaS) have their own nexus and taxation rules that differ from physical goods.

Professional Advice: While this guide covers the basics, once you approach nexus thresholds, consulting with a sales tax accountant or tax professional is highly recommended. The cost of professional guidance is typically far less than the cost of mistakes.

Frequently Asked Questions

Q: I'm just starting out and have minimal sales. Do I need to register for sales tax now?

A: No, you don't need to register unless you have physical presence in a state or have exceeded that state's economic nexus threshold. However, you should start tracking your sales by state immediately. Set up a reminder to check your numbers quarterly so you know when you're approaching thresholds.

Q: Does selling through Amazon mean I never have to worry about sales tax?

A: In most cases, Amazon collects and remits sales tax for you in most states, which simplifies things significantly. However, this isn't universal across all states and may have changed since 2026. Check Amazon Seller Central for current tax information, and verify whether you have any separate filing obligations in your specific states.

Q: What if I exceed the threshold in the middle of the year? Do I owe tax retroactively?

A: This varies by state, but many states require you to start collecting from the date you exceeded the threshold, and some expect you to calculate what you should have collected retroactively and remit it. Register immediately once you exceed the threshold, and consult your state's sales tax authority about retroactive liability.

Q: I'm in Nevada (no sales tax). Do I ever need to collect sales tax?

A: You don't owe Nevada state sales tax, but you almost certainly owe sales tax to other states where your customers are located. Being in a NOMAD state doesn't exempt you from collecting tax on sales to customers in states with sales tax.

Q: Is there a way to know exactly when I'll hit the sales tax threshold?

A: Use our free nexus calculator to input your current sales by state. This will show you exactly which states you've already exceeded the threshold in, and which states you're approaching. If you're within 20% of a threshold, start planning your registration.

Q: What happens if I don't register and collect when I should?

A: States can assess penalties for non-compliance, including back taxes owed plus interest and additional penalties. They may also restrict your business license renewal or pursue collection actions. The best approach is proactive compliance rather than reactive scrambling.

Key Takeaways

Economic nexus has replaced physical presence as the primary trigger for sales tax obligations in most cases
Track your sales by state constantly—this is the single most important action you can take
The $100,000 threshold is standard but not universal; verify each state's specific rules
Marketplace facilitators simplify collection but only if they're actively collecting for you
Register immediately if you have physical presence in any state, regardless of sales volume
Use tools and professional help as you grow; the compliance burden becomes more complex at scale

Related Resources

Learn more about sales tax compliance for online sellers:

This article is for informational purposes only and does not constitute tax advice. Consult with a qualified tax professional regarding your specific sales tax obligations.