Ecommerce Sales Tax: The Complete 2026 Guide (Nexus, State Rules, Filing and Automation)

You made your first online sale. Congratulations. Now comes the part nobody warns you about. Forty-five states levy a state level sales tax and 38 of them also allow local sales taxes, which is how one country ends up with over 12,000 taxing jurisdictions watching your revenue. Cross a threshold you were not tracking and you owe back tax, interest, and penalties on every sale since the day you crossed it. The rules changed in 2018, and physical borders stopped protecting remote sellers. This guide covers nexus, state thresholds, registration deadlines, filing steps, audits, and what sales tax compliance software actually costs in 2026.

What Is Ecommerce Sales Tax and How Does It Work?

Ecommerce sales tax is the standard state sales tax applied to an online purchase, collected by the seller at checkout and remitted to the state. Ecommerce sales tax is not a separate category of tax with its own rate book. You act as a temporary custodian of money that belongs to the state from the moment your customer pays it.

Forty-five states and Washington D.C. impose sales tax on online sales. Five states impose none: New Hampshire, Oregon, Montana, Alaska, and Delaware. Sellers call those the NOMAD states. Alaska is the exception inside the exception, because Alaska has no statewide sales tax but does allow its localities to levy one.

Scale is what breaks manual compliance. The population weighted average combined rate across the country is 7.53 percent, and the spread runs from Louisiana at 10.13 percent down to zero, with California holding the highest state level rate at 7.25 percent. Each of those 12,000 jurisdictions can set its own rate, its own rules, and its own product exemptions.

Sales Tax vs Use Tax: What Is the Difference?

Use tax is the buyer side companion to sales tax, owed by the purchaser when a seller does not collect sales tax on a taxable out of state purchase. Businesses also owe use tax on taxable equipment and supplies bought without tax applied. States created use tax to stop out of state sellers from undercutting local retailers by simply not charging tax.

How the Wayfair Ruling Created Economic Nexus for Remote Sellers

South Dakota v. Wayfair is the 2018 Supreme Court decision that let states tax remote sellers based on sales volume instead of physical presence. Before it, a state could only require collection from sellers with a store, a warehouse, or staff inside its borders. Online sellers with none of those often collected nothing anywhere.

The decision created what the industry now calls economic nexus. Every obligation in this guide traces back to it, which is why the threshold tables below matter more than your business address does.

Sales Tax Nexus Explained: Physical, Economic, and Click Through

Nexus is the connection between your business and a state that creates a duty to register, collect, and file there. Four different connections can trigger it, and they stack rather than replace each other. You can have nexus in a state on two grounds at once and still only register once.

Each type below is triggered by something different, so check all of them against your own operation.

Physical Nexus From Inventory, Staff, or Offices

Physical nexus exists when you keep a store, warehouse, office, employee, or inventory inside a state. Storing products in a fulfillment center creates it even when you have never visited the state. Sellers using third party fulfillment routinely discover physical nexus in four or five states during an audit rather than before one.

Economic Nexus From Sales Volume Alone

Economic nexus is triggered by your revenue into a state, with no physical footprint required. Most states set the bar at $100,000 in sales, and a shrinking minority still add a 200 transaction alternative. Once you cross the line you must register in that state before you collect, and multi state exposure is what turns a simple return into a set of state corporate tax filings that all have to agree with each other.

Click Through and Affiliate Nexus From Referral Deals

Click through nexus is created by paying an in state partner a commission for referred sales. Some states treat a blogger or influencer who sends you revenue as your presence in that state, with thresholds as low as $10,000 in referred sales per year. Review every affiliate and influencer agreement you have, because these thresholds are far lower than the economic ones and almost nobody tracks them.

Economic Nexus Thresholds by State for 2026

The most common economic nexus threshold in 2026 is $100,000 in sales into a single state, measured across the current or previous year. The 200 transaction alternative is disappearing fast, which matters most to low price high volume sellers who used to trip the count long before the dollar figure. Sixteen states had dropped a transaction count test by April 2026, and Kentucky became the seventeenth on August 1.

Three high volume states set a much higher bar than the rest, so read the table below before assuming you owe anywhere.

Ecommerce Sales Tax by State: Key Reference Table for 2026

Two points the table cannot hold. New York is the outlier that catches sellers out, because New York requires you to exceed both $500,000 and 100 sales, so crossing one alone does not create nexus. California is the other, because California counts the combined sales of the retailer and all related persons, which means two brands under common ownership are measured as one.

What Changed in Ecommerce Sales Tax for 2026

The defining 2026 change is the collapse of the transaction count threshold, which removes the trap that used to catch small basket sellers first. A store averaging $30 orders hit 200 transactions at roughly $6,000 of revenue in a state, triggering registration at a revenue level no owner would think to check. In the seventeen states that now test revenue only, that same store has no obligation until it reaches $100,000.

Four dated changes affect your 2026 filings.

• Illinois removed its 200 transaction threshold on January 1, 2026.
• Kentucky removed its 200 transaction threshold on August 1, 2026 under House Bill 757.
• Utah removed its 200 transaction threshold on July 1, 2025.
• Alaska removed its 200 transaction threshold on January 1, 2025, leaving $100,000 in gross sales as the only local registration trigger.

One warning no threshold chart will give you. State guidance pages lag their own statutes, sometimes by months. In August 2026, the published Illinois and Kentucky sales tax pages both still described the old dual threshold, weeks after the repeals took effect. Work from the statute and its effective date rather than the summary page, and keep a dated copy of whatever you relied on.

How Long Do You Have to Register After Crossing a Nexus Threshold?

Registration deadlines are set state by state, and several of the largest states do not require you to register immediately. The common advice that you must register before your next taxable sale is wrong in Texas and misleading in New York, and following it wastes weeks of scramble. The three states below run three different clocks, which is why one company wide policy does not work.

Check the specific rule for every state you cross, because the gap between them is measured in months.

Texas Gives You Until the First Day of the Fourth Month

Texas sets a safe harbor at $500,000 of Texas revenue measured over the preceding twelve calendar months. Once you exceed it, Texas requires a permit and collection beginning no later than the first day of the fourth month after the month you crossed. Cross in July and your obligation starts on October 1, which is a real grace period rather than a same day trigger. Sellers below the safe harbor still have to keep records of all Texas sales.

New York Requires Twenty Days of Advance Notice

New York measures $500,000 of gross receipts and more than 100 sales across the immediately preceding four sales tax quarters, and both tests have to be met. The state directs sellers to apply for a certificate of authority at least 20 days before they begin operating in the state. Because the lookback is a rolling four quarters rather than a calendar year, your New York status can change in a quarter when your sales actually fell.

Illinois Reviews Your Nexus Every Quarter

Illinois requires remote retailers to determine nexus quarterly instead of annually. Illinois sets the review dates as the last day of March, June, September, and December, each looking back twelve months. A seasonal store can therefore acquire Illinois nexus in January and drop below it by December, and both events need a filing decision rather than silence.

How to Register, Collect, Report, and File Ecommerce Sales Tax

Registration comes before collection in every state, and collecting tax without a permit is its own violation. The workflow below is the same in all 45 taxing states, and only the deadlines and forms change. Getting the sequence right is what keeps a routine obligation from becoming a penalty.

Work through the four steps in order for each state where you have nexus.

Step 1: Register for a Sales Tax Permit

A sales tax permit is the state issued authorisation that lets you legally collect tax from buyers in that state. Apply through the state revenue department using your Employer Identification Number, and expect a small registration fee or none at all depending on the state. Keep the permit number, the effective date, and the assigned filing frequency in one place, because you will need all three every time you file. Sellers running several entities should confirm which entity holds nexus first, since a multi entity ecommerce structure changes which company registers where.

Step 2: Set Up Tax Collection at Checkout

Destination based sourcing means the rate is set by where the buyer takes possession, and it governs most remote sales. Configure your platform to calculate from the shipping address rather than your own location. Remote sellers almost always collect at the buyer’s rate, and only a small number of origin based states apply the seller’s rate instead. California sits in the middle as a modified origin state, where the state and county portion follow the seller and the district portion follows the buyer.

Step 3: File Returns and Remit on Schedule

Filing frequency is assigned by the state based on your collected volume, not chosen by you. High volume sellers file monthly, mid volume sellers file quarterly, and the smallest file annually. File a return for every assigned period even when you collected nothing, because zero returns are mandatory in most states and a missed zero return draws the same late penalty as a missed payment. About half the states also offer a timely filing discount worth roughly 1 to 2 percent of the tax remitted, which is free money most sellers never claim.

Step 4: Register Through Streamlined Sales Tax Where It Applies

The Streamlined Sales and Use Tax Agreement is a shared registration and simplification system that 24 states have now adopted. One application through the Streamlined system registers you across every member state that you select, instead of 24 separate applications on 24 different portals. Enrolment also changes what compliance software costs you, because Avalara lists Streamlined participation as one of the factors that moves its own pricing. Handling this alongside your multi state tax filings is what keeps the registrations and the returns in agreement.

Shopify Sales Tax, Amazon, eBay and Marketplace Facilitator Rules

Marketplace facilitator laws moved the duty to collect and remit from the seller to the marketplace for sales made on its platform. Amazon, eBay, Etsy, and Walmart all qualify, so they collect and remit on your behalf and you do not file separately for those transactions in most states. The distinction sellers get wrong is that a marketplace handling the tax does not remove the sale from your nexus maths, which is where clean ecommerce accounting stops a threshold from being crossed unnoticed.

Two rules decide whether an obligation is yours or the platform’s.

Shopify is the exception that costs sellers the most. Shopify acts as a marketplace facilitator only for orders placed through the Shop app, so if you run your own Shopify storefront the collection, filing, and remittance duty stays with you. Shopify Tax will calculate the right rate, but calculating is not filing, and many owners discover the difference only when a state sends a notice.

Marketplace sales still count toward your economic nexus totals in nearly every state. Even where Amazon remits every dollar, those sales push you toward the $100,000 line, so a seller who is 90 percent marketplace and 10 percent direct can owe registration in a state on the strength of revenue they never touched. Track gross revenue by state across every channel, not just the channels you file for.

Amazon FBA Sellers Carry Two Separate Obligations

Amazon FBA creates physical nexus through inventory storage at the same time as Amazon handles the tax on its own marketplace sales. Your FBA units sitting in a fulfillment center in Ohio give you Ohio physical nexus regardless of revenue, which then applies to your direct sales into Ohio even though Amazon remits on the Amazon ones. Sellers who also ship internationally should note that FBA and FBM VAT compliance works on entirely different rules from United States sales tax, so neither system tells you anything about the other.

Best Ecommerce Sales Tax Software and Automation Tools in 2026

Ecommerce sales tax software is a rate calculation and filing system that tracks nexus, applies the correct jurisdiction rate at checkout, and in some cases submits returns for you. Manual calculation stops being viable somewhere around the third or fourth state, because 12,000 jurisdictions do not fit in a spreadsheet that a human maintains. Choosing between the platforms is harder than it should be, because half the market does not publish a price.

Understand what you are actually buying before you compare anything.

Sales Tax Engines and Filing Services Are Two Different Products

A sales tax engine calculates the correct rate in real time at checkout, and a filing service prepares and submits the returns. Buying one does not get you the other, and the most expensive mistake in this category is assuming an engine files. Vendors bundle them differently, so a quote that looks cheap often covers calculation only and leaves you filing 30 returns a quarter by hand. Ask which of the two a price covers before you compare two prices at all. The engine also has to agree with your books, which is the job ecommerce accounting software does on the other side of the sync.

What Ecommerce Sales Tax Software Costs in 2026

Published pricing exists for only a minority of the sales tax software market, and the pricing models are not directly comparable. Three vendors publish enough to plan against, and the rest quote on transaction volume and state count. The table below carries only figures published by the vendors themselves as of August 2026.

Two conclusions follow from that table. A percentage based calculation fee is cheap for a low volume store and expensive for a high volume one, so model your own revenue against both structures before signing. And because most of the market quotes rather than publishes, budget for the sales process itself when you plan a migration.

Where Sales Tax Automation Breaks in Real Stores

Automation fails at the integration seams rather than in the tax calculation itself. The engine is usually correct and the data reaching it is usually wrong, which produces a confidently filed return built on bad inputs. Four failure points account for most of it.

• Product tax codes left at default, so clothing, groceries, supplements, and digital goods get taxed at the general rate in states that exempt or reduce them.
• Marketplace orders imported into the engine alongside direct orders, which double counts tax the marketplace already remitted.
• Refunds and partial refunds that never flow back, leaving you remitting tax on revenue you returned.
• A second sales channel added months later and never connected, so its revenue is invisible to nexus tracking.

Reconcile what the engine reports against what your bank actually received at least once a quarter. A mismatch found in the quarter is a correction, and the same mismatch found in an audit is a penalty.

How to Monitor Economic Nexus Thresholds Across Every State

Nexus monitoring is the ongoing measurement of your revenue and transaction counts against 45 separate thresholds, and it is the control that prevents the expensive version of this problem. Sellers rarely fail because they refused to register. They fail because they crossed a line in a state they were not watching and only learned about it 18 months later, by which point back tax, interest, and penalties have all compounded. Fast geographic growth makes this worse, because the states you cross next are the ones you have never modelled.

Build the monitoring around four habits rather than an annual review.

• Track gross revenue and order count by state monthly, including every marketplace channel, since marketplace sales count toward thresholds even when the platform remits.
• Set an internal alert at 75 percent of each state’s threshold, which leaves time to register before the obligation starts rather than after.
• Record which measurement period each state uses, because a rolling twelve month test and a calendar year test produce different answers from identical sales.
• Re check quarterly rather than annually, since Illinois requires it and the rolling states effectively do too.

Sellers running several storefronts need one revenue view across all of them before any of this works, which is what multi channel ecommerce accounting is built to produce.

Bookkeeping for Collected Sales Tax

Collected sales tax is a liability on your balance sheet, not revenue on your income statement. The distinction is the most misunderstood rule in ecommerce accounting and it causes real financial damage, because a business that treats collected tax as income spends money it has to hand over later. When you collect $500 in tax, that $500 belongs to the state from the moment it arrives.

Four practices keep the liability accurate and the cash available.

• Hold collected sales tax in a separate bank account so it is never part of your working capital.
• Record every collection to a sales tax payable account rather than to sales income.
• Reconcile collected against remitted every filing period, by state, not in total.
• Never spend collected tax before remittance, including to cover a short month.

Getting the liability side right is ordinary bookkeeping services work, and it is far cheaper than reconstructing three years of it later.

A Worked Example: Reconciling Collected Tax to a Filed Return

Reconciliation compares what your engine says you collected against what your bank actually received and what your books recorded. A Shopify and Stripe apparel store collects across six states in the first quarter, and the numbers below show every step of the check.

The engine reports $8,463 for the same quarter, which is $63 more than the books. The gap traces to two refunded orders where the tax went back to the customer but the original sale still sat in the engine’s totals. The correct liability is $8,400, so that is what gets filed and remitted, and the $63 is removed from the engine’s report rather than added to the return.

One detail this example protects. Payment processing fees never reduce the tax you owe. On a single $100 order in an 8 percent state you charge $108, Stripe takes $3.43, and $104.57 lands in your account. You still remit the full $8.00 to the state, your revenue is $100, and the $3.43 is a processing expense. Netting the fee against the sale would understate revenue and leave the tax liability wrong in the same entry.

How Ecommerce Sales Tax Applies to Different Seller Types

Sales tax exposure depends on how you sell, not just on how much you sell. Two businesses with identical revenue can have completely different obligations based on channel mix, product type, and how fast they entered new states. The three profiles below cover most of the sellers who get this wrong.

Find the profile closest to yours before you pick a tool or a filing calendar.

Multi Channel Sellers Running Shopify and Amazon Together

Multi channel sellers carry a split obligation, because the marketplace remits for its own sales while the seller remits for the direct storefront. A store doing 70 percent of revenue on Amazon and 30 percent on its own Shopify site files only for the Shopify portion, yet measures nexus on the full 100 percent. Amazon inventory adds physical nexus on top of that, in every state holding stock. The practical requirement is one revenue report by state across all channels, and a separate filing report for the direct channel only.

Direct to Consumer Brands Scaling Into New States

Direct to consumer brands hit thresholds faster than their finance function grows, because a single successful campaign can push a brand past $100,000 in three or four states in one quarter. A beauty or supplement brand faces a second problem on top of the speed, since product taxability varies by state for supplements, cosmetics, and anything positioned as a health product. No, a direct to consumer brand does not collect in every state, only in the states where it has crossed a threshold or holds inventory. Set the 75 percent alerts before the campaign, not after.

Clinics and Practices Selling Products Alongside Services

Clinics face a mixed profile, because professional services are generally outside the sales tax base while the physical goods they sell often are not. A practice selling supplements, skincare, or retail devices alongside its consultations may hold a collection duty on the product revenue and none at all on the service revenue, which means one entity running two different tax treatments through one till. For a practice, the larger tax lever usually sits on the income side rather than the sales side, which is why tax deductions for doctors tend to move the number more than sales tax ever will.

What Happens If You Get Audited for Ecommerce Sales Tax?

A sales tax audit is a state review of whether you collected the right amount, on the right transactions, and remitted it on time. States have grown more aggressive on remote sellers since 2018 because the revenue is significant and the compliance rate is poor, and multi state ecommerce businesses are now a standing priority rather than an occasional target. An audit typically opens with a records request covering three to four prior years.

Know what the state will actually ask for.

• Gross sales by state for every period under review, reconciled to your bank deposits.
• Exemption certificates for every sale you treated as exempt, which is the single most common failure point.
• Proof of the product tax codes you applied, especially for exempt or reduced rate categories.
• Filed returns and remittance evidence, including zero returns for periods with no activity.

The audits that go badly are the ones where the seller cannot produce documentation, not the ones where the seller made a calculation error. An error with records behind it becomes an adjustment. A missing certificate becomes tax assessed on the full sale, with interest, and the burden of proof sits with you.

Common Ecommerce Sales Tax Mistakes and How to Avoid Penalties

Most ecommerce sales tax penalties come from six repeatable mistakes rather than from complex judgement calls. Each one is cheap to prevent and expensive to discover late. Read the list against your own setup rather than in the abstract.

• Assuming no nexus because you work from home and hold no physical store.
• Collecting tax in a state before the permit is issued, which is its own violation.
• Skipping zero returns in periods where you collected nothing.
• Leaving product tax codes at default so exempt categories get taxed at the general rate.
• Accepting a wholesale or nonprofit order without capturing the exemption certificate.
• Spending collected tax before the remittance date.

What Happens If You Do Not Collect Ecommerce Sales Tax?

A state that finds uncollected tax will assess the tax itself against you, plus interest and penalties, for every period you were required to collect. The seller becomes liable for tax that should have been charged to customers who are long gone, which is why the exposure grows faster than the revenue did. States can also revoke a business license for repeated violations, and the assessment reaches back to the date nexus began rather than the date you were caught.

Using a Voluntary Disclosure Agreement to Fix Past Non Compliance

A Voluntary Disclosure Agreement is a formal arrangement where a seller approaches a state before the state approaches them, in exchange for reduced or waived penalties and a limited lookback period. Most states cap the lookback at three or four years instead of running to the first day of nexus, which is often the difference between a manageable settlement and an unpayable one. The one condition that matters is timing, because the option usually disappears the moment the state opens contact with you. Sellers who need this done across several states at once usually need a multi channel bookkeeping cleanup first, since a disclosure is only as good as the numbers inside it.

Exemption Certificates You Have to Collect and Keep

An exemption certificate is the buyer supplied document that justifies not charging tax on an otherwise taxable sale. Wholesale buyers, resellers, nonprofits, and some government purchasers all require one, and the certificate is what converts an untaxed sale from a liability into a defensible position. Collect it at the point of sale rather than at audit, check that it is complete and signed, and store it against the transaction. Certificates also expire in some states, so a valid certificate from 2022 may not cover a 2026 sale from the same customer.

Your Ecommerce Sales Tax Compliance Checklist

The checklist below is the working version of everything above, ordered the way a compliant seller actually runs it. Work down it once to establish your position, then repeat the monthly and quarterly items on schedule.

• List every state where you hold inventory, staff, or an office, and register in each one regardless of revenue.
• Pull gross revenue and order count by state for the trailing twelve months across every channel.
• Compare each state total against its own threshold and its own measurement period.
• Register in each state where you have crossed, and confirm that state’s deadline before assuming it is immediate.
• Configure destination based rates and set correct product tax codes for every category you sell.
• Record all collected tax to a sales tax payable account and hold the cash separately.
• File every assigned return on schedule, including zero returns, and claim the timely filing discount where offered.
• Reconcile engine totals to bank deposits and to filed returns each quarter, by state.
• Capture and file an exemption certificate for every untaxed sale as it happens.
• Re check all thresholds quarterly and set alerts at 75 percent of each one.

Our Compliance and On Time Delivery Guarantees

Multi state sales tax is exactly the kind of obligation where a single missed deadline costs more than a year of doing it properly. Two guarantees cover that risk.

Regulatory Compliance Assurance. We ensure all tax filings, payroll, and financial reports meet compliance standards. If an error on our part results in a financial penalty, we will cover the cost.

On Time Delivery Guarantee. Monthly, quarterly, and annual reports are delivered without delays. If we miss a compliance deadline due to our fault, we pay a 50 percent fee refund.

Conclusion

Ecommerce sales tax rewards a system and punishes improvisation. The Wayfair decision handed every state the power to tax your online sales, and the thresholds, deadlines, measurement periods, and platform rules all move independently of each other. A seller who tracks revenue by state monthly and registers on the state’s own clock will never face the version of this problem that involves back tax.

The sequence does not change whether you sell on Shopify, Amazon, or your own platform. Know where you have nexus. Register before you collect, on that state’s deadline. Collect at the destination rate with correct product codes. File everything on schedule, including the zero returns. Reconcile quarterly and keep the certificates. If you would rather hand the whole calendar to someone else, GATP Solutions runs it as a monthly service.

Ready to Stop Guessing on Ecommerce Sales Tax?

We will pull your revenue by state across every channel, show you which thresholds you have already crossed, which registrations are missing, and what your real exposure looks like if a state opened an audit tomorrow. Then we will tell you what can be automated and what genuinely needs a person. Thirty days, one clear answer, no obligation.

Book a free consultation and take control of your ecommerce sales tax compliance today.

Frequently Asked Questions About Ecommerce Sales Tax

How does sales tax work for ecommerce?

Online sellers collect sales tax in every state where they have nexus, then remit it to that state on an assigned schedule. Nexus comes from physical presence, such as inventory or staff, or from crossing a state’s economic threshold, which is most commonly $100,000 in sales. Once you have nexus you register, collect at the buyer’s rate, and file returns for every period.

Do I need to collect sales tax for selling online?

Yes, in any state where you hold inventory or have crossed that state’s economic nexus threshold. Most states set the threshold at $100,000 in annual sales into the state, while California, Texas, and New York set it at $500,000. The five NOMAD states of New Hampshire, Oregon, Montana, Alaska, and Delaware impose no state sales tax, though Alaska localities do.

When do I need to start collecting sales tax?

Collection starts on the date the state specifies after you cross its threshold, and that date is not always immediate. Texas gives you until the first day of the fourth month after the month you crossed. New York asks you to register at least 20 days before you begin operating there. Check the individual state rule, because registering before your permit is issued and collecting without one are both violations.

How much does ecommerce sales tax software cost per return?

Only a minority of vendors publish per return pricing, so the honest answer is that most of the market quotes rather than lists. Avalara publishes a calculation and returns package starting at $699 and registration at $403 per location. Shopify Tax charges a 0.35 percent calculation fee after your first $100,000 of annual global sales, capped at $0.99 per order, and prices filing as an unpublished flat fee per return.

Which sales tax software is best for multi channel sellers?

Multi channel sellers need a platform that separates marketplace sales from direct sales while still counting both toward nexus. The requirement is a single revenue view across every channel for threshold tracking, paired with filing that covers only the channels where you carry the obligation. Confirm whether a quoted price includes filing or calculation alone, because bundling differs by vendor and that one question changes the total more than the headline rate does.

Does Shopify collect and remit sales tax for me?

No, not for your own Shopify storefront. Shopify acts as a marketplace facilitator only for orders placed through the Shop app, so sales through your own store leave the collection, filing, and remittance duty with you. Shopify Tax calculates the correct rate, but calculating a rate is not filing a return.

How do I monitor economic nexus across all states?

Track gross revenue and order count by state every month across all channels, and compare each total against that state’s own threshold and measurement period. Set an internal alert at 75 percent of each threshold so registration happens before the obligation starts. Re check quarterly rather than annually, because Illinois requires a quarterly determination and the rolling twelve month states change more often than a calendar year review would catch.

Do direct to consumer brands need to collect sales tax in every state?

No, only in states where the brand holds inventory or has crossed the economic nexus threshold. A brand selling nationally from one warehouse may owe in five states and nothing in the other forty. Fast growing brands should watch the thresholds monthly, because a single campaign can cross several at once, and supplements and cosmetics carry product taxability differences on top of that.

What happens if I do not collect sales tax?

The state assesses the uncollected tax against you personally as the seller, plus interest and penalties, back to the date your nexus began. States can also revoke a business license for repeated violations. Past non compliance can usually be settled through a Voluntary Disclosure Agreement with reduced penalties and a shorter lookback, but only if you approach the state before it approaches you.

How do I pay sales tax for my ecommerce business?

Register for a permit with each state’s revenue department, then file and remit on the frequency that state assigns you. Filing frequency is set by your collected volume, so high volume sellers file monthly and smaller sellers file quarterly or annually. File a return for every assigned period even when you collected nothing, because most states require zero returns and penalise a missing one.