What Founders Need to Know About State Tax Nexus

State tax nexus is the legal threshold that triggers a business's obligation to collect and remit taxes in a given state. For startups, nexus can be created by having employees working remotely in a state, earning revenue from customers there, or maintaining physical property or offices. Since the Supreme Court's 2018 South Dakota v. Wayfair decision eliminated the physical presence requirement for sales tax, even lean startups with distributed teams can find themselves with filing obligations in dozens of states.

---

What Creates Nexus

Nexus isn't a single concept—it varies by tax type. A company might have income tax nexus in a state without having sales tax nexus, or vice versa. Understanding the different triggers is essential.

Physical Presence Nexus

The traditional nexus standard: if you have a physical presence in a state, you have nexus there. Physical presence includes:

• Employees. A single employee working from home in a state generally creates nexus for income tax, franchise tax, and potentially sales tax purposes. This is the biggest trap for startups with remote teams.
• Office space. Leased or owned office space, co-working memberships, or even temporary project space can establish nexus.
• Property. Inventory, equipment, servers, or other tangible personal property located in a state creates nexus. Cloud servers don't typically create nexus (they're located in the cloud provider's facilities), but on-premises equipment at a customer site might.
• Independent contractors. In some states, independent contractors performing services on your behalf can create nexus—particularly for sales tax if they're soliciting sales.

Economic Nexus (Post-Wayfair)

The 2018 South Dakota v. Wayfair decision fundamentally changed the nexus landscape. The Supreme Court held that states can require businesses to collect sales tax even without a physical presence, based solely on economic activity in the state.

Most states have adopted economic nexus thresholds, typically modeled on South Dakota's standard:

• $100,000 in sales into the state, or
• 200 transactions with customers in the state

in the current or previous calendar year. Some states use only a dollar threshold; others use both. A few set higher thresholds (e.g., California's $500,000). These thresholds apply to gross revenue, not net—returns and refunds may or may not count depending on the state.

Critical distinction: Economic nexus under Wayfair applies specifically to sales and use tax. It does not directly create income tax nexus—though many states have separately expanded their income tax nexus standards through factor-presence tests (discussed below).

Factor Presence Nexus (Income Tax)

For state income tax purposes, many states have adopted factor-presence nexus standards that go beyond traditional physical presence. The Multistate Tax Commission (MTC) model provides that a business has income tax nexus if it has:

• $50,000+ in property in the state,
• $50,000+ in payroll in the state,
• $500,000+ in sales into the state, or
• 25% or more of total property, payroll, or sales in the state.

States that have adopted some version of factor presence include California, Colorado, Connecticut, Michigan, New York, Ohio, and Washington, among others. The specific thresholds vary by state.

This means a startup with no employees or property in a state but significant revenue from customers there may still owe state income tax—a concept that surprises many founders.

Income Tax vs. Sales Tax Nexus

These are separate obligations that operate under different rules:

State Income Tax

Once you have income tax nexus in a state, you must file a state income tax return and pay tax on income apportioned to that state. Apportionment formulas vary but generally consider:

• Sales factor. Revenue sourced to the state (most states now use a single-sales-factor formula, weighting revenue most heavily).
• Payroll factor. Compensation paid in the state.
• Property factor. Assets located in the state.

For a Delaware C corporation, being incorporated in Delaware doesn't insulate you from income tax in states where you have nexus. Delaware is your state of incorporation—you still owe income tax to states where you do business. (You'll also owe Delaware franchise tax, which is a separate obligation based on incorporation, not nexus.)

Pass-through entities: If your startup is structured as an LLC or S corporation, state income tax nexus can create filing obligations for individual owners in states where the entity has nexus—even if the owners don't live there. This is called "composite" or "withholding" obligations and varies significantly by state.

State Sales Tax

Sales tax nexus requires you to collect and remit sales tax on taxable transactions in the state. Key considerations for startups:

• SaaS taxability. Whether software-as-a-service is subject to sales tax varies enormously by state. Some states (e.g., Texas, New York, Pennsylvania) tax SaaS; others (e.g., California, for now) generally don't. This is the single most important question for most tech startups.
• Marketplace facilitator laws. If you sell through platforms like Amazon, Shopify, or app stores, the marketplace may be responsible for collecting and remitting sales tax on your behalf—but not always, and not in every state.
• Exemptions. Many B2B SaaS transactions may qualify for resale or other exemptions, but you need proper exemption certificates on file.
• Tax on services. Most states don't tax services broadly, but some (e.g., Hawaii, New Mexico, South Dakota, West Virginia) tax nearly all services. Know where your revenue comes from and whether it's taxable.

The Remote Employee Nexus Trap

This is the nexus issue that catches the most startups off guard. When you hire a remote employee in a new state, you potentially trigger:

1. Income tax nexus (and a new state income tax return filing obligation)
2. Sales tax nexus (if you weren't already collecting in that state)
3. Payroll tax obligations (withholding, unemployment insurance)
4. State registration requirements (foreign qualification, discussed below)
5. Employment law compliance (wage/hour laws, leave requirements, non-compete enforceability)

A single remote hire can create five new compliance obligations. Multiply that across a distributed team of 15 people in 10 states, and you have a significant compliance burden.

Practical Strategies for Remote Teams

Before hiring in a new state:

1. Assess the tax impact. What are the income tax and sales tax implications? Does the state tax SaaS?
2. Calculate the compliance cost. State registration, tax filings, payroll setup, and ongoing compliance can cost $2,000–$5,000+ per state per year.
3. Weigh the cost against the hire. Sometimes it makes sense to focus hiring in states where you already have nexus.

Contractor vs. employee considerations: Using contractors instead of employees in certain states can reduce nexus exposure—but only if the classification is legitimate. Misclassifying employees as contractors to avoid state tax obligations is a compliance risk, not a strategy. See our guide on employee vs. contractor classification.

State Registration Requirements

When a company has nexus in a state, it typically must "foreign qualify"—register with the state as a foreign entity authorized to do business there. This is separate from (but related to) tax registration.

Foreign Qualification

A Delaware C corporation operating in California needs to register with the California Secretary of State as a foreign corporation. This involves:

• Filing an application for foreign qualification
• Appointing a registered agent in the state
• Paying filing fees (varies by state, typically $100–$800)
• Filing annual reports and paying associated fees
• Becoming subject to the state's franchise tax or minimum tax

Many states require foreign qualification whenever a company is "doing business" in the state—which typically includes having employees or an office there. The consequences of failing to qualify range from penalties and back taxes to losing the ability to enforce contracts in that state's courts.

Sales Tax Registration

Separately from foreign qualification, a company with sales tax nexus must register for a sales tax permit in each applicable state. This is a distinct registration from the business entity registration and is filed with the state's department of revenue (or equivalent).

Some states participate in the Streamlined Sales Tax (SST) program, which allows businesses to register for sales tax in multiple SST member states through a single application. This doesn't simplify compliance, but it simplifies registration.

Franchise Tax Obligations Beyond Delaware

Most founders are aware of Delaware's franchise tax, but many states impose their own franchise taxes, gross receipts taxes, or minimum taxes that apply to foreign-qualified entities:

• California: $800 minimum franchise tax for any entity doing business in or registered in the state (temporarily waived for the first year for new entities in some years).
• Texas: Franchise (margin) tax based on revenue, with a $2.47 million no-tax-due threshold.
• Illinois: Annual report fee plus franchise tax based on paid-in capital (being phased out).
• New York: Fixed dollar minimum tax based on New York receipts, plus potential metropolitan transportation business tax surcharge.
• Ohio: Commercial Activity Tax (CAT) based on gross receipts, applicable to businesses with $150,000+ in Ohio taxable gross receipts.

These obligations exist independent of profitability. A pre-revenue startup registered in California still owes the $800 minimum franchise tax. Budget for these costs when planning your multi-state footprint.

Building a Practical Compliance Framework

For a multi-state startup, tax compliance requires a systematic approach. Here's a framework:

Step 1: Map Your Nexus Footprint

Create a state-by-state matrix documenting:

• Where you have employees (including remote workers)
• Where you have physical property or office space
• Where you have significant customer revenue
• Which states you've foreign-qualified in
• Which states you're registered for sales tax in

Update this matrix quarterly or whenever you hire in a new state.

Step 2: Prioritize by Risk

Not all nexus exposures are equal. Focus first on:

1. States where you have employees (highest risk, clearest nexus)
2. States where you have significant revenue and the state taxes your product/service
3. States with aggressive enforcement (California, New York, Texas)

Step 3: Engage Specialists

Multi-state tax compliance is not a DIY project. Engage:

• A state and local tax (SALT) advisor who understands startup economics
• A payroll provider (Gusto, Rippling, Deel) that handles multi-state withholding
• Sales tax automation software (Avalara, TaxJar, Anrok) if you have sales tax obligations

The cost of professional compliance is a fraction of the cost of back taxes, penalties, and interest from getting it wrong.

Step 4: Establish Processes

• New hire checklist: Before hiring in any new state, run through a nexus assessment.
• Revenue monitoring: Track revenue by state to identify when you cross economic nexus thresholds.
• Annual review: Revisit your nexus matrix annually, accounting for law changes, new hires, and revenue shifts.
• Voluntary Disclosure Agreements (VDAs): If you discover past-due obligations, many states offer VDA programs that waive or reduce penalties in exchange for voluntary registration and back-filing. These are almost always better than waiting to be discovered.

Step 5: Budget for Compliance

A realistic budget for multi-state tax compliance at a seed-stage startup with employees in 5–10 states:

• State registrations and annual reports: $3,000–$8,000/year
• Franchise/minimum taxes: $2,000–$10,000/year
• Income tax preparation (per state): $500–$1,500/state/year
• Sales tax automation: $2,000–$10,000/year
• SALT advisory: $5,000–$15,000/year for periodic review

Total: roughly $15,000–$50,000 annually. This isn't trivial for a seed-stage company, but it's a manageable cost of doing business—and far less than the exposure from noncompliance.

Key Takeaways

State tax nexus is an area where startups frequently accumulate technical debt—ignoring obligations that compound over time. The earlier you establish a compliance framework, the less painful it is to maintain. Key principles:

1. Every remote hire is a nexus event. Assess the implications before extending the offer.
2. Sales tax and income tax are separate analyses. Having nexus for one doesn't automatically mean you have nexus for both—but it often does.
3. Economic nexus is real. Post-Wayfair, revenue alone can trigger sales tax obligations even without employees or property.
4. Compliance costs are a cost of doing business. Budget for them alongside rent, payroll, and software subscriptions.
5. VDAs are your friend. If you're behind, voluntary disclosure is almost always the best path forward.

For a broader view of how compliance fits into your startup's legal operations, integrate state tax nexus monitoring into your regular legal and financial review cadence.