If you sell products or services across state lines, sales tax nexus rules in 2026 affect you more than ever. States have refined their thresholds, updated their measurement rules, and deployed new enforcement tools that make it harder to fly under the radar. Knowing exactly when and where you owe sales tax is one of the most important compliance steps your business can take this year.
The landscape has shifted significantly since the early days of economic nexus. By May 2026, most states will have moved away from transaction-count tests and toward cleaner revenue-only thresholds. That simplifies things for smaller sellers, but adds more pressure on growing businesses watching their gross receipts climb.
At AMZ Accountant, we work with remote sellers and e-commerce businesses navigating multi-state compliance every day. This guide breaks down the 2026 sales tax nexus rules in plain language so you can understand your obligations and spot risks before they become problems.
What Triggers Collection Duties In 2026
Before you can manage your sales tax obligation, you need to know what creates it. Two main triggers exist: economic nexus and physical nexus. Each works differently depending on the state.
Economic Nexus After South Dakota v. Wayfair
The 2018 South Dakota v. Wayfair decision changed everything. Before Wayfair, states could only require you to collect and remit sales tax if you had a physical presence there.
After the decision, states gained the legal authority to impose sales tax obligations on remote sellers based purely on economic activity.
Every state with a sales tax has now adopted some form of economic nexus. The most common trigger is $100,000 in sales in a state within a defined period. If your remote seller’s sales cross that line, you are required to begin collecting tax, register with the state, and file returns.
Physical Nexus Vs Economic Nexus
Physical nexus still exists and can catch you off guard. If you have an office, warehouse, employee, or inventory stored in a state, you have physical nexus there regardless of your sales volume.
This matters if you use fulfillment centers or third-party logistics providers. Physical nexus vs economic nexus comes down to presence versus revenue.
You could have physical nexus in a state where your sales are below the economic nexus threshold, and you would still owe tax. Both types of nexus create a collection duty, and states look for both.
When Sales Tax Obligation Starts
Your sales tax obligation typically begins the first day of the calendar month after you cross a state’s threshold. Some states give you until the first day of the following quarter.
Missing this start date creates back liability that states can assess with interest and penalties. Check each state’s rules individually.
A few states require you to begin collecting tax immediately upon crossing the threshold, with no grace period built in.
How Thresholds Are Measured State By State
The way states measure your nexus threshold varies more than most sellers realize. Revenue definitions, lookback windows, and transaction tests all differ across the country. Knowing the measurement rules matters as much as knowing the dollar amount.
Revenue Threshold And Transaction Count Tests
Most states in 2026 use a pure revenue threshold with no transaction count attached. The dominant benchmark is a $100,000 threshold in gross sales into the state over a specified period.
A smaller group of states still layer on a transaction threshold alongside the revenue test. States like Arkansas, Georgia, Louisiana, Maryland, Michigan, Nebraska, New Jersey, Ohio, and West Virginia still use a combined test: $100,000 in sales or 200 transactions.
Either trigger is enough to create nexus. Connecticut uses an AND model, requiring both $100,000 in sales AND 200 transactions before nexus kicks in.
New York is the strictest dual-requirement state. You must hit both $500,000 in revenue AND 100 separate transactions before you have economic nexus there.
Gross Sales, Gross Receipts, And Taxable Sales
Some states count gross sales (your total revenue including exempt items) toward the nexus threshold. Others count only taxable or retail sales.
Illinois, for example, measures against gross sales, which means your exempt transactions still push you toward the limit.
The difference between gross receipts and taxable sales can be the gap between having nexus and not having it. If a large portion of what you sell is exempt, using gross receipts to measure could create nexus that a taxable-sales measure would not.
Review each state’s specific definition before assuming you are safe.
Calendar Year, Lookback Period, And Measurement Period
Most states use either the current or previous calendar year to measure your threshold. The lookback period is the window the state uses to determine whether you have crossed the line.
Some states use a rolling 12-month measurement period, meaning they review the most recent 12 months continuously rather than resetting at January 1.
This can mean you cross a threshold midyear without realizing it. Set up monthly monitoring of your sales by state to catch this before the state does.
Marketplace And Remote Seller Counting Rules
Marketplace facilitator laws add another layer to nexus analysis, especially if you sell on platforms like Amazon or Etsy alongside your own website. The key question is which sales count toward your threshold and who is responsible for collecting the tax.
Marketplace Facilitator Laws And Seller Responsibility
Most states have enacted marketplace facilitator laws that require platforms to collect and remit sales tax on behalf of sellers. This shifts the collection duty from you to the marketplace for those transactions.
In most states, marketplace sales that the facilitator has already taxed do not count toward your economic nexus threshold as a seller. Marketplace facilitator rules vary by state.
Some states still require the individual seller to register once they cross the threshold, even if the marketplace handles tax collection. Registration and collection duties are two different things.
Marketplace Sales Included Vs. Excluded
Whether your marketplace sales are included or excluded when measuring your nexus threshold depends on the state. In states where marketplace sales are excluded from your threshold calculation, you could have millions in sales through Amazon and still have no nexus obligation for your own direct sales channel unless those direct sales cross the limit.
In states where marketplace sales are included in your threshold, your Amazon revenue counts against the same $100,000 limit as your website sales. This is a critical distinction for sellers who run both channels.
No Statewide Sales Tax And Alaska Local Rules
Five states have no statewide sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. For most of these states, you have no state-level sales tax obligation.
Alaska is a special case. While Alaska has no statewide sales tax, many of its localities do impose local sales taxes.
The Alaska Remote Seller Sales Tax Commission coordinates collection rules across participating Alaska jurisdictions. If you sell into Alaska and your sales are significant, check whether you have triggered any local nexus obligations through the Commission’s framework.
Notable 2026 State Patterns And Outliers
The 2026 economic nexus landscape is not uniform, and a few patterns stand out clearly when you look across all states. Knowing which category each state falls into helps you prioritize your nexus review.
The Common $100,000 Model
The majority of states with a sales tax follow the $100,000 revenue-only model. States like Arizona, Colorado, Florida, Indiana, Kansas, Kentucky, Massachusetts, Minnesota, Missouri, North Carolina, Pennsylvania, South Dakota, Tennessee, Washington, and Wyoming all use this benchmark with gross receipts as the measure.
Illinois joined this group on January 1, 2026, when it repealed its 200-transaction threshold. For most growing sellers, the $100,000 model is the easiest to monitor because the math is straightforward.
High-Threshold States Like California
California sales tax nexus does not kick in until you hit $500,000 in gross receipts from California buyers. Texas uses the same $500,000 threshold.
These high-threshold states give smaller remote sellers a longer runway before obligations begin. The stakes are much higher once you cross the line, given the size of these markets.
California sales tax rates combined with local rates can push your total liability well past what you expect, so tracking your California revenue carefully is worth the effort.
States Still Using Transaction-Based Tests
Even as the trend moves toward revenue-only thresholds, some states hold onto transaction-based tests. Connecticut remains one of the clearest examples, requiring both $100,000 in sales AND 200 transactions.
New York uses a high-bar AND test requiring $500,000 in revenue and 100 transactions. States like Alabama and Mississippi sit at a $250,000 threshold, a mid-tier outlier relative to the $100,000 majority.
If your sales are growing and approaching the $250,000 range in any state, run a nexus review before you cross the line.
Registration, Monitoring, And Audit Risk
Once you know where you have nexus, the next steps are to register, monitor ongoingly, and protect yourself from audit exposure. Each of these requires consistent attention.
When To Apply For A Sales Tax Permit
You need a sales tax permit before you begin collecting tax in a state. Collecting tax without a permit is itself a violation in many states.
As soon as you determine you have crossed a threshold or have physical nexus somewhere, start the registration process right away. Registration timelines vary.
Some states process applications immediately online. Others take several weeks. Factor in that delay when you are planning your compliance calendar, so you are not collecting tax you cannot remit.
Nexus Monitoring And Ongoing Review
Nexus monitoring is not something you do once and forget. Your sales volume changes, states update their laws, and new physical connections can appear when you least expect them.
A quarterly nexus review is a reasonable minimum for most multi-state sellers. Sales tax compliance software can automate much of this by tracking your revenue by state in real time.
Pair software with a periodic manual nexus study, especially after any significant business change, such as adding a warehouse, hiring a remote employee, or entering a new sales channel.
Sales Tax Audit Exposure And Defense
States are using AI tools to cross-reference marketplace data against tax filings. New York, California, and Michigan have all deployed these systems, making non-filers easier to catch than ever before.
If you are behind on registration or filings, your audit risk is real and growing. A sales tax audit can result in assessments that include back taxes, interest, and penalties reaching up to 40% of the tax due.
Engaging a sales tax audit defense specialist before or during an audit is the most effective way to limit your exposure and challenge inflated assessments.
Fixing Past Exposure Before States Contact You
If you have been selling into states without collecting tax and you have crossed their thresholds, you have historical exposure. The good news is that you have options to resolve it proactively, often at a much lower cost than waiting for a notice.
Voluntary Disclosure Agreements And VDA Basics
A voluntary disclosure agreement, or VDA, is a formal arrangement between you and a state tax authority where you come forward voluntarily to report and pay back taxes. In exchange, the state typically limits how far back it will assess you and may reduce or eliminate penalties.
Most states offer VDA programs. The process involves submitting an application, calculating your back liability, and negotiating the terms.
Many VDAs are handled anonymously through a representative at first, which protects your identity during the negotiation phase.
Penalty Waivers And Limited Lookback Relief
One of the biggest benefits of a voluntary disclosure agreement is the availability of penalty waivers. Instead of facing interest and penalties that can add up to 40% or more of the tax owed, a VDA often reduces that to the base tax plus a limited interest charge.
Some states cap the lookback period at three or four years, even if your exposure goes further back. Illinois is currently offering a Remote Retailer Amnesty Program running from August 1 to October 31, 2026.
This program allows sellers to settle liabilities from 2021 through 2026 at reduced rates, without interest, making it one of the strongest relief opportunities available right now.
Affiliate Nexus, Click-Through Nexus, And Notice And Reporting
Some states also use affiliate nexus and click-through nexus rules to bring more sellers into their tax base. Affiliate nexus applies when a business in one state promotes your products in exchange for a commission.
Click-through nexus applies when referral agreements with in-state residents drive sales to your site. Notice and reporting requirements are a separate obligation that some states impose. If you sell into a state but do not collect sales tax, some states require you to send buyers an annual notice of their use tax obligation and report those sales to the state. Ignoring these rules creates its own set of penalties.
A few states also levy a gross receipts tax instead of a traditional sales tax, most notably New Mexico, which uses a 4.875% gross receipts tax rate in 2026.
Get Your Sales Tax Nexus Right in 2026
Sales tax nexus rules are only getting more complex, and states are getting better at finding sellers who aren’t compliant.
Whether you’re approaching a threshold for the first time, selling across multiple channels, or carrying historical exposure you haven’t addressed yet, the cost of waiting is almost always higher than the cost of acting now.
At AMZ Accountant, we help remote sellers and e-commerce businesses get compliant, stay compliant, and resolve past liabilities before states come knocking. If you’re not sure where you stand, contact us today for a nexus review, and let’s make sure your business is protected.
Frequently Asked Questions
What creates sales tax nexus for an online business selling across state lines?
Sales tax nexus is created by a physical presence in a state or by exceeding a state’s economic nexus threshold through sales volume. Marketplace facilitator activity, affiliate relationships, and remote employees can also create nexus.
How do economic nexus thresholds (sales or transaction counts) differ by state in 2026?
Most states use a $100,000 revenue-only threshold. Some states combine a revenue test with a transaction count.
Connecticut requires both $100,000 in sales AND 200 transactions. New York requires $500,000 AND 100 transactions.
California and Texas have a $500,000 revenue-only threshold. Alabama and Mississippi use $250,000.
What is the economic nexus threshold in California for 2026?
California’s economic nexus threshold in 2026 is $500,000 in gross receipts from sales into the state within the calendar year. This is a revenue-only test with no transaction count.
How can I check my sales tax nexus status using a by-state threshold chart or calculator?
Pull your sales data by state for the past 12 months and compare it to each state’s threshold. Many compliance platforms offer nexus calculators that automate this process.
If I exceed a state’s threshold mid-year, when do I need to start collecting sales tax?
In most states, you must start collecting sales tax on the first day of the month after crossing the threshold. Some states require immediate collection or allow more time, so check each state’s rules.
Do marketplace facilitator rules change whether I still need to register for sales tax in a state?
Marketplace facilitators usually collect tax for you, but you may still need to register if your total in-state sales cross the nexus threshold. Check each state’s requirements, as rules vary.