The three triggers that mean you need to register in a second state

If your company was formed in one state and now has people, property, or customers in another, there's a good chance the second state already expects something from you. Registration in a new state isn't triggered by size or by revenue alone. It's triggered by specific activity, and the activity often starts before anyone thinks to check.

Three triggers account for most second-state registrations: an employee working in the state, a physical presence such as an office, property, or inventory, and sales into the state that cross its economic nexus threshold. Each one creates a different obligation. An employee creates payroll tax registration, a physical presence usually requires foreign qualification and creates income or franchise tax exposure, and crossing a sales threshold creates a sales tax registration requirement. One trigger can lead to more than one obligation.

Registration means more than one thing

"Registering in a state" covers several separate registrations, each with its own agency, form, and ongoing filings. It helps to keep them apart.

Foreign qualification. Registering your entity with the state's secretary of state as a business formed elsewhere but doing business there. A Delaware company qualifying in California, for example, registers as a foreign corporation in California. This usually brings an annual report and a state registered agent.

Payroll tax accounts. Registering with the state's tax and labor agencies to withhold state income tax (where the state has one) and to pay state unemployment insurance.

Sales tax permit. Registering with the state's revenue department to collect and remit sales tax on taxable sales into the state.

Income or franchise tax. Filing a state income or franchise tax return because the company has nexus for corporate tax purposes. This usually follows from the other triggers rather than requiring a separate application.

Trigger one: an employee working in the state

Hiring someone who works from another state is the most common way a company ends up with obligations there. It applies to remote employees, not only to people working out of an office.

When a W-2 employee works in a state, the company generally has to register with that state to withhold state income tax (if the state has one) and to pay state unemployment insurance. Payroll for that employee can't run correctly until the accounts exist, and most payroll providers will ask for the state account numbers before the first paycheck.

In many states, having an employee there also counts as doing business, which means the company should foreign qualify and may owe state income or franchise tax. The rules differ by state, so a remote hire is the point to check all four registrations, not only payroll.

Independent contractors generally don't create payroll registration requirements, because the company isn't withholding for them. Whether a worker is a contractor or an employee depends on the working relationship, not the label, and misclassification is its own risk.

Trigger two: a physical presence in the state

An office, a warehouse, inventory stored in a fulfillment center, property the company owns or leases, or regular in-person operations all establish a physical presence. Physical presence is the oldest form of nexus and still the clearest.

A physical presence almost always means the company is doing business in the state and should foreign qualify. It also creates nexus for state income or franchise tax, and for sales tax if the company makes taxable sales.

Inventory is the version of this trigger most often missed. A company that sells physical products through a third-party fulfillment network can have inventory stored in several states without choosing which ones. Each of those states can treat the stored inventory as physical presence.

Trigger three: sales that cross an economic nexus threshold

Since the Supreme Court's 2018 decision in South Dakota v. Wayfair, a state can require a company to collect sales tax based on sales into the state alone, with no physical presence. This is economic nexus, and every state with a sales tax has adopted it.

Most states set the threshold at $100,000 in sales into the state over the current or previous year. Some set it higher. California and Texas use $500,000, and Alabama and Mississippi use $250,000. New York uses $500,000 combined with a minimum of 100 transactions.

Some states also have a second test of 200 separate transactions, where crossing either the dollar figure or the transaction count creates nexus. That test is being removed state by state. Illinois dropped it on January 1, 2026, and Kentucky dropped it on August 1, 2026, but roughly 15 states and Washington, D.C. still use it. For companies with many low-value sales, the transaction test is often the one crossed first.

Two points matter for service and software companies. First, economic nexus only creates a collection obligation for sales that are taxable in that state, and the taxability of SaaS and digital services varies widely. Second, which sales count toward the threshold (taxable only, or all sales including exempt ones) also varies by state.

Income tax nexus can follow from sales alone

Economic nexus isn't limited to sales tax. Several states also assert corporate income or franchise tax nexus based on sales into the state above a set amount, with no employee or property there.

A federal law, Public Law 86-272, protects companies whose only activity in a state is soliciting orders for tangible goods. It does not cover services, software, or digital products, which is why software and service companies are more exposed to state income tax nexus from sales than product companies are.

The obligations start when the trigger happens

Registration is due when the activity begins or the threshold is crossed, not when the company notices. A company that hires a remote employee in March and registers in October has seven months of unfiled payroll returns. A company that crossed a sales threshold last year and never registered owes the tax it didn't collect, plus penalties and interest, and usually can't recover it from past customers.

Most states offer voluntary disclosure agreements for companies that come forward before the state contacts them. These typically limit how many years back the state will assess and waive some penalties. They're worth knowing about, but they cost more than registering on time.

Inkle tracks these triggers for the US companies we work with, including state registrations, foreign qualifications, and the annual filings that follow from them, so a new hire or a sales milestone in another state doesn't go unnoticed.

The bottom line

Your company's obligations in a second state are set by what it does there, not by where it was formed. An employee, a physical presence, or sales above a state's threshold can each require registration, and each one usually leads to more than one filing. The practical move is to treat every remote hire, new location, inventory placement, and sales milestone as a moment to check the state's rules, because the obligation starts the day the trigger happens.

Frequently asked questions

Do I need to register in a state if I hire one remote employee there?

Generally yes. A W-2 employee working in a state usually requires state payroll registration for income tax withholding (where the state has an income tax) and unemployment insurance. Many states also treat an employee as doing business there, which can require foreign qualification and state income or franchise tax filings.

What is the economic nexus threshold for sales tax?

In most states it is $100,000 in sales into the state over the current or previous year. California and Texas use $500,000, Alabama and Mississippi use $250,000, and New York uses $500,000 plus 100 transactions. About 15 states and Washington, D.C. also apply a 200-transaction test.

Does a Delaware company need to register in the state where it operates?

Usually yes. A company formed in Delaware but operating in another state is typically doing business in that state and must foreign qualify there. Foreign qualification brings its own annual reports and fees, separate from Delaware's.

Do contractors in another state create nexus?

Contractors generally don't create payroll registration requirements, since the company isn't withholding for them. They can still create nexus in some states if they perform core business activities there on the company's behalf, and misclassifying an employee as a contractor creates separate risk.

Is SaaS subject to sales tax in every state?

No. Some states tax SaaS and digital products, some exempt them, and some tax them partially. Economic nexus only requires collection on sales that are taxable in that state, so taxability has to be checked state by state.

What happens if I registered late in a state?

The company can owe back taxes, penalties, and interest for the period it should have been registered. Many states offer voluntary disclosure agreements that limit the lookback period and reduce penalties if the company comes forward before the state contacts it.