Your startup’s first out-of-state sale can create a tax obligation nobody on the team is tracking. The state holds the seller liable for tax it should have collected, even years later. That liability accrues silently while founders focus on product and growth.
This guide explains where sales tax obligations come from, what each state actually requires, and how to fix past mistakes before they compound. Early compliance prevents the retroactive liability that surfaces in audits and investor due diligence. The pivotal event is South Dakota v. Wayfair, Inc. (2018), which let states tax remote sellers with no physical presence.
When Do Startups Need to Collect Sales Tax?
A startup must collect sales tax in a state once it establishes nexus there and registers for a permit. Nexus is a physical or economic connection to the state. Today 45 states and the District of Columbia (DC) impose a sales tax, and five states impose none. Registration comes first, because collecting without a permit is illegal in most states.
The five NOMAD states with no statewide sales tax are Alaska, Delaware, Montana, New Hampshire, and Oregon, per the U.S. Government Accountability Office (GAO). Alaska localities can still impose local sales tax. The GAO estimates between 10,000 and 12,000 active U.S. sales tax jurisdictions. Compliance follows four steps: determine nexus, register, collect, then file and remit.
What Is Sales Tax Nexus?
Nexus is the connection between a business and a state that creates a collection obligation. It comes in two forms: physical nexus and economic nexus. Physical nexus comes from a tangible footprint in the state. Economic nexus comes from sales volume alone. A startup can trigger either one without realizing it, and remote-first teams trigger physical nexus most often.
What creates physical nexus?
Physical nexus comes from an office, owned property, inventory in the state (including third-party logistics and Amazon Fulfillment by Amazon warehouses), employees, contractors, dropshipping arrangements, and trade show attendance in some states. Any one of these creates an obligation before you cross any dollar threshold. See the FBA and trade show FAQs below for detail.
Do remote employees create sales tax nexus?
Yes. In most states a single remote employee creates physical nexus, which makes remote-first startups the highest-risk group for unknown exposure. Treatment varies by state and by what the employee does, so verify each state’s rule against its Department of Revenue (DOR) before deciding. One engineer hired in a new state can obligate you to register there.
What is economic nexus?
Economic nexus is a collection obligation created by sales volume alone, with no physical presence. It was established by South Dakota v. Wayfair, Inc., decided 5-4 on June 21, 2018. Before Wayfair, Quill Corp. v. North Dakota (1992) required physical presence before a state could compel collection. Wayfair overruled Quill, and every sales-tax state then adopted economic nexus rules.
What Are the Economic Nexus Thresholds by State in 2026?
Most states use $100,000 in sales, but thresholds are not uniform. California, Texas, and New York use $500,000, and many states have repealed their transaction-count triggers. You cannot assume $100,000 or 200 transactions everywhere. Check each state, because the measurement period and what counts toward the threshold also vary.
| State | Sales threshold | Transaction count | Notable point | Source |
|---|---|---|---|---|
| Wayfair model (most states) | $100,000 | 200 (many repealed) | Standard adopted after 2018 | SCOTUS Wayfair opinion |
| South Dakota | $100,000 | None | 200-transaction prong dropped July 1, 2023 | South Dakota DOR |
| Alaska (local only) | $100,000 | None | 200-transaction prong repealed Jan. 1, 2025 | Alaska Remote Seller Commission |
| California | $500,000 | None | Higher-threshold state | Commenda US Nexus Guide |
| Texas | $500,000 | None | Higher-threshold state | Commenda US Nexus Guide |
| New York | $500,000 | 100 (AND, not OR) | Both tests must be met | Commenda US Nexus Guide |
The trend since 2023 is away from transaction counts, because a count unfairly caught small-dollar, high-volume sellers. As of June 2021, all 45 states with a sales tax plus DC had economic nexus rules, per the GAO. For a startup expanding past its home state, see sales tax compliance for multi-state businesses.
Is SaaS Taxable in Your State?
Roughly 20 or more states tax Software as a Service (SaaS) in some form, and classification varies. States treat it as tangible property, a taxable service, or an exempt sale, which makes product taxability the hardest problem for software startups. The same product can be taxable in one state and exempt in the next, so verify each state and expect rules to change.
| State | SaaS taxable? | Digital downloads taxable? | Key note | Source |
|---|---|---|---|---|
| Texas | Yes (80% of charge) | Yes | Taxed as a data processing service | Texas Tax Code §151.351 |
| Florida | No | No | Favorable to digital sellers | Florida DOR |
| California | No | No | Taxes tangible property only | CDTFA Publication 109 |
| New York | Yes | Yes | Prewritten software is taxable | NY DOR software bulletin |
| Washington | Yes | Yes | Broad taxation of digital products | Washington DOR |
Chicago is the local-level surprise. Its Personal Property Lease Transaction Tax hits SaaS at the city level even though Illinois does not broadly tax SaaS statewide. This is why nexus and taxability must be checked at the local level too.
Is SaaS taxable in Texas?
Yes. Texas classifies SaaS as a data processing service, and Texas Tax Code §151.351 exempts 20% of the charge, so 80% is taxable. Texas is known for aggressive audit enforcement. The Texas Comptroller also applies a 5% de minimis carve-out for bundled service contracts.
Does Florida tax SaaS?
No. Florida does not tax pure SaaS and generally does not tax electronically delivered digital goods, per Florida DOR guidance. This makes Florida favorable for digital sellers. Tangible goods are taxable at the 6% state rate plus discretionary county surtaxes. Software becomes taxable only when sold with tangible personal property.
Does California tax digital goods and SaaS?
Generally no. California taxes tangible personal property, and CDTFA Publication 109 confirms electronically delivered software and digital goods with no physical medium are generally exempt. Providing a physical backup copy can make the whole sale taxable. California remains complex on rate sourcing for tangible goods, with more than 1,000 district rates.
New York taxes SaaS as prewritten software, including remotely accessed software, per the NY DOR. Washington taxes SaaS and digital products broadly.
What Is Use Tax and Why Does It Matter for Startups?
Use tax is the buyer-side complement to sales tax. When a seller does not charge tax on a taxable purchase, the buyer owes use tax directly to the state at the same rate. Startups owe use tax as buyers on untaxed equipment and software bought from out-of-state vendors. Auditors routinely check for unpaid use tax first.
Do Marketplace Facilitator Laws Cover Your Sales?
If you sell through Amazon, Etsy, eBay, or Walmart Marketplace, the platform collects and remits tax on those marketplace sales in nearly every state. That coverage does not extend to direct sales through your own website. The trap: marketplace sales can still count toward economic nexus thresholds in some states even when the facilitator remits the tax.
So a seller who assumes the platform handles everything can still owe registration and filing on direct-channel sales. Separate your marketplace and direct transactions before you file, so you neither double-remit nor miss a return.
How Do Startups Register and File Sales Tax?
Register for a permit in each nexus state before you collect, because collecting without a permit is illegal in most states. Then file on each state’s assigned frequency, monthly, quarterly, or annually, including zero returns for periods with no sales. Registering late is a top startup mistake, since it exposes you to back tax, penalties, and interest.
Some states require registration within a set window of crossing a threshold. Filing frequency depends on volume, and each state sets its own due dates. Once you are in three or more states, a compliance calendar tracks every deadline and renewal so nothing lapses.
How Do You Fix Past Sales Tax Non-Compliance?
Start with a nexus study to quantify exposure by state, then use a Voluntary Disclosure Agreement (VDA) to come forward, limit the lookback period, and usually get penalties waived. Penalty abatement handles smaller or one-off misses for reasonable cause. Do not simply register first, because registering before a VDA can forfeit VDA eligibility in many states.
A VDA is a formal agreement where a business discloses past-due tax proactively, often anonymously through a representative. It typically caps the lookback at three to four years instead of the unlimited lookback a state can pursue after it contacts you. Unremediated tax liability compounds with interest, and it is a common price-reducer in fundraising and M&A due diligence. Address it early, while a VDA is still available.
How Big Is Sales Tax Audit Risk for Startups?
Audit risk is real and grows with your multi-state footprint. The main triggers are missing exemption certificates on business-to-business sales, product misclassification, and unregistered nexus with large historical gaps. The real cost is rarely the single audit. It is the accumulated, unremediated liability the audit uncovers across years, plus compounding interest.
Why do exemption certificates matter in an audit?
In an audit, uncertified exempt sales become taxable to the seller. When you sell tax-free to a reseller, nonprofit, or manufacturer, you must collect and retain a valid exemption certificate to justify not charging tax. Missing or invalid certificates are one of the most common audit assessments, so exemption certificate management is core audit defense.
Should Startups Automate or Outsource Sales Tax Compliance?
Calculation tools handle rates at checkout but leave registration, filing, remittance, notices, and audits to you. A tool like Stripe Tax applies the correct rate and can flag thresholds, yet the compliance responsibility stays on your team. Managed compliance covers the full lifecycle instead. A US-only seller with a single sales channel may be adequately served by a point solution.
Once you sell across several states and channels, the operational load outgrows a calculator. Commenda supports 100 or more ERP, API, and custom integrations, including QuickBooks, Xero, NetSuite, Stripe, and Shopify, listed on Commenda’s integrations page. See sales tax compliance outsourcing for how a managed service divides the work.
How Commenda Handles Sales Tax Compliance for Startups
Commenda’s global indirect tax software gives you certainty that your sales tax is handled. It tracks your physical and economic nexus across every state, then handles registration, filing, remittance, and exemption certificate management from one platform. Former state auditors on the team represent you directly in active audits.
Use the evergreen US nexus exposure guide to check thresholds, and the sales tax calculator to look up rates at any address. For the broader picture, sales tax compliance basics and Form 1120 filing show where sales tax sits alongside your other obligations.
Book a demo to get a free nexus exposure assessment and find out exactly which states you owe tax in before an auditor does.
