Multi-State Tax Nexus in 2026: Sales Tax, Income Tax, P.L. 86-272, and the Remote-Employee Trap

TLDR

Multi-state nexus is the single most-missed tax issue for growing businesses. Three different nexus regimes apply, each with different triggers: (1) Sales tax — $100K in sales OR 200 transactions in most states (post-Wayfair 2018); register + collect once triggered. (2) Income tax — physical presence still triggers + 15 states now claim economic-nexus jurisdiction over your income with thresholds as low as $100K-$500K in receipts; P.L. 86-272 historically protected tangible-goods sellers from state income tax but the MTC’s 2021 revised statement gutted the protection for any business with a website, cookies, or in-state customer support. (3) Payroll tax — one remote employee in another state triggers payroll-tax registration in that state. The dollar cost when you discover nexus 3 years late: back tax + ~25% penalty + ~8% annual interest, multiplied across every state you triggered. A $200K-revenue SaaS founder with one remote employee in California can owe $40K-$80K in back state tax + penalties before they even know nexus existed.

In this guide, you’ll learn:

Understand the three nexus regimes — sales tax, income tax, payroll tax — and how each has different triggers
See the post-Wayfair $100K/200-transaction sales tax thresholds + the income tax economic nexus map across 15 states
Recognize why the MTC’s 2021 statement effectively killed P.L. 86-272 protection for any internet-active business
Calculate the back-tax / penalty / interest exposure when nexus is discovered 3 years late (worked SaaS example)
Use Voluntary Disclosure Agreements (VDAs) to limit look-back and waive penalties when you self-disclose

#What “nexus” actually means

Nexus is the legal threshold that gives a state the right to tax you. Each state defines its own — there’s no federal nexus standard. The same business can have:

Nexus for sales tax in 12 states
Nexus for income tax in 7 states (different set)
Nexus for payroll tax in 3 states (yet another set)

Most business owners only think about nexus when they get a notice from a state department of revenue. By then it’s been triggering for months or years, and the state’s clock has been running.

#The three types of nexus

The three regimes trigger on different facts, demand different filings, and each carries its own classic trap:

The three nexus regimes at a glance
	Sales tax	Income tax	Payroll tax
Trigger	$100K in sales or 200 transactions	Physical presence + economic nexus (15 states)	One employee working in the state
What you must do	Register, collect, file + remit returns	File a state income/franchise return, apportion income	Register, withhold, pay SUI, file payroll returns
Key gotcha	Wayfair (2018) made economic nexus universal	P.L. 86-272 protection is eroding fast	The remote-move trap — employee relocates, you go non-compliant day one

#1. Sales tax nexus

Triggered by either:

Physical presence — an office, warehouse, employee, inventory, or contracted sales rep in the state
Economic nexus — exceeding sales-volume thresholds set by the state

Post-South Dakota v. Wayfair (2018), every U.S. state that imposes sales tax has economic nexus laws. The bright-line threshold most states use:

$100,000 in gross sales to in-state customers in the prior year, OR
200 separate transactions to in-state customers in the prior year

Once triggered: you must register, collect sales tax, file periodic returns (monthly, quarterly, or annually depending on volume), and remit collected tax to the state.

Important trend: states are increasingly eliminating the 200-transaction threshold and keeping only the dollar threshold (because high-volume low-ticket sellers were getting caught unfairly). California, New York, Illinois, and several others have moved to dollar-only thresholds.

#2. Income tax nexus

Triggered by:

Physical presence — same as sales tax
Doing business — having employees, inventory, or operations in the state
Economic nexus for income tax — 15 states now claim jurisdiction over your income based on revenue thresholds

The major income-tax economic nexus states + their thresholds (current as of 2026):

State	Threshold
California	$735,019 in California sales (annually adjusted)
New York	$1,159,000 in New York receipts
Texas	$500,000 in Texas receipts (franchise tax)
Massachusetts	$500,000 in Massachusetts sales
Connecticut	$500,000 in Connecticut sales
Pennsylvania	$500,000 in Pennsylvania sales
New Jersey	”Operating in New Jersey” + nexus presumption
Tennessee	$500,000 in receipts
Hawaii	$100,000 in sales or 200 transactions
Ohio	$500,000 in gross receipts (CAT tax)
Washington	$100,000 in Washington receipts (B&O tax)

If you exceed the threshold, the state can tax your income proportional to in-state activity using apportionment formulas (sales-only, three-factor, or single-sales-factor depending on the state).

#3. Payroll tax nexus

Triggered when you have any employee working in the state — even one remote worker who lives there. Requires:

Registering as an employer in that state’s payroll-tax system
Withholding state income tax from the employee’s wages
Paying state unemployment insurance contributions
Filing periodic state payroll returns

The post-COVID trap: an employee who used to live in your home state moves to another state without telling you. You keep paying them the same way. You’re now non-compliant with payroll tax in the new state from day one of their move.

#P.L. 86-272 — the federal income-tax protection that used to matter

Public Law 86-272 (passed in 1959) is a federal statute that prevents states from imposing income tax on sellers of tangible personal property if the only in-state activity is solicitation of orders that are sent outside the state for approval and fulfillment.

This was historically a huge protection for traveling salespeople, mail-order businesses, and remote-sales-only operations.

What still qualifies for P.L. 86-272 protection (the old way):

Sales reps physically traveling through a state taking orders
Mail-order solicitation
Trade-show booth attendance for taking orders

What disqualifies P.L. 86-272 protection:

Selling intangibles (software-as-a-service, licenses, services) — never qualified, P.L. 86-272 is tangible-goods only
Any non-sales activity: installation, repair, technical support, post-sale customer service, training
Having an in-state employee whose work goes beyond solicitation
Holding inventory in-state

#The MTC’s 2021 revised statement — P.L. 86-272 is dying

In August 2021, the Multistate Tax Commission (MTC) revised its statement on P.L. 86-272 and declared that routine digital activities exceed mere solicitation and therefore disqualify a seller from protection:

Having a website that uses cookies to gather customer data
Providing in-state customer service via the website (chat, contact form, etc.)
Offering post-sale electronic communications (emails, push notifications)
Allowing customers to download free apps on devices physically in the state
Inviting in-state customers to create accounts, save preferences, or submit reviews

In practical terms: if you have a website that does anything beyond static product listing + order form, the MTC says P.L. 86-272 doesn’t protect you.

States that have adopted the MTC’s revised statement (in whole or part):

California (the most aggressive — first to adopt)
New York
New Jersey
Illinois
Minnesota
Several others have proposed adoption or are litigating

Litigation status (2026): California’s adoption was challenged in court (American Catalog Mailers Association v. Franchise Tax Board). The case is ongoing but California continues to enforce the position. Most CPAs assume P.L. 86-272 is effectively dead for any business with an internet presence.

#The dollar math — what nexus mistakes cost

To make this concrete: Andrea, a SaaS founder, runs a $1.2M-revenue business in 2026. She lives in Texas. She has:

400 customers in California totaling $280K in revenue
200 customers in New York totaling $190K in revenue
1 remote employee in California
1 contractor (W-9, not employee) in Florida

What nexus has she triggered?

State	Income tax nexus?	Sales tax nexus?	Payroll nexus?
CA	YES ($280K > some thresholds + employee)	NO (SaaS often not taxable in CA)	YES (employee)
NY	YES ($190K — close to threshold, plus MTC erosion of 86-272)	NO (SaaS not taxable)	NO
FL	NO (contractor, not employee)	NO	NO
TX	YES (home state, franchise tax)	NO (under $500K TX-only)	YES

So Andrea owes income tax in CA, NY, and TX — three state returns. Plus payroll registration + ongoing payroll tax compliance in CA + TX. If she misses any one of these:

CA back income tax for 3 years at ~9% effective state rate × her CA-apportioned income = ~$5K-$15K
CA failure-to-file penalty = up to 25%
CA interest = ~5-7% annually compounded
CA payroll registration penalty for unregistered remote employee = up to $500/quarter
NY equivalent — similar magnitude
Total exposure 3 years late: $25K-$75K

The same business properly registered from day one would have owed about $8K-$15K total across all three states. The penalty/interest cost of waiting is massive.

#What triggers nexus most commonly (the avoidable cases)

In our experience working with growing businesses, these are the top 5 surprises:

Hiring a remote employee in a new state. Payroll nexus is instant. The employee triggers it the day they start work.
Crossing the $100K sales threshold in a new state for the first time. Most businesses don’t have a tracker that flags this. They find out via a notice.
Storing inventory at an Amazon FBA warehouse. Amazon ships to dozens of states, holding your inventory in their warehouses, triggering physical-presence nexus everywhere they have a warehouse you’ve used.
Trade-show attendance — even briefly. Some states count this as physical presence.
Hiring contractors in new states who are reclassified as employees by the state’s labor department. The state then comes back for income tax + payroll tax.

#What to do once you’re nexus-positive

Your fix depends on how long you've been triggering

How long have you been nexus-positive in that state?

Recommended Less than 90 days
Register now + start filing

Penalty + interest are mild this early. Some states waive prior-period liability if you register voluntarily inside a registration window.
3 months to 3 years
Voluntary Disclosure Agreement

A VDA limits look-back to 3-4 years, waives some or all penalties, and charges back tax + reduced interest. Submit through a representative, often anonymously.
3+ years
Amnesty or VDA with representation

Exposure is large enough that professional representation is essentially mandatory. Use state amnesty if offered, otherwise a carefully-disclosed VDA.

Never approach a state directly before a VDA is filed — they look up your taxpayer ID before you sign anything.

Different strategies based on how much time has passed:

#If you’ve been nexus-positive < 90 days

Register now and start filing. Most states’ penalty + interest structures are mild if you self-disclose early. Some states have a “registration window” where they waive prior-period liability if you register voluntarily.

#If you’ve been nexus-positive 3 months to 3 years

Voluntary Disclosure Agreement (VDA) — most states have a formal VDA program that:

Limits look-back to 3-4 years (rather than the state’s full statute of limitations, which can be 6+ years for unfiled returns)
Waives some or all penalties
Charges back tax + reduced interest

VDAs require a written submission, often anonymously through a representative. Don’t approach the state directly — they will look up your taxpayer ID before you ever sign anything.

#If you’ve been nexus-positive 3+ years

Tax amnesty if the state offers one (CA periodically does), or VDA with careful disclosure. At this point, professional representation is essentially mandatory — the dollar exposure is large enough that mistakes get expensive.

#How to actually track nexus going forward

A real nexus-monitoring practice:

Quarterly nexus review. Pull state-by-state revenue. Compare against each state’s threshold. Flag any state you’re within 80% of the threshold for proactive monitoring.
Employee/contractor state-of-residence audit. Every quarter, confirm where each employee/contractor physically works. Anyone who’s moved triggers a registration cascade.
Sales-tax automation tools — Avalara, TaxJar, or similar — handle the tracking + filing once you’re registered. Worth the $50-300/mo subscription cost for any business with revenue >$300K.
Annual nexus study — at minimum, a 30-min internal review per year with someone who knows multi-state. We run these as part of advisory engagements for any ETS client with operations in 2+ states.

#Common questions

Does P.L. 86-272 still apply to my business? For tangible-goods sellers who sell exclusively via traveling reps with no internet presence and no in-state non-sales activity: yes, still applies. For everyone else (any internet-active business): assume it doesn’t, especially in CA/NY/NJ.

I have customers in 30 states. Do I have nexus in all 30? Probably not. Most states require both (a) economic threshold met AND (b) some other connection (employee, inventory, etc.) for income tax. For sales tax, the $100K/$200-transaction thresholds DO trigger nexus regardless of presence — that’s the post-Wayfair rule.

What if my products aren’t subject to sales tax in a particular state? You still have nexus if you exceed the threshold — you just don’t have to collect/remit sales tax on the exempt products. You may still have INCOME tax nexus separately. Each state defines what’s taxable differently.

I’m a SaaS company. Do I have sales tax nexus? Depends on the state. As of 2026, ~20 states tax SaaS as a “taxable digital product” (NY, MA, OH, etc.); ~30 don’t. The taxability question is separate from the nexus question.

My contractor is a 1099 — does that trigger nexus? Generally no for income/payroll tax purposes (since they’re not an employee). BUT if the state later reclassifies them as an employee, it does. Higher-risk states for misclassification: CA, NY, MA, NJ. If you have a long-term 1099 working 30+ hours/week, that’s a reclassification risk.

What about inventory in an Amazon FBA warehouse? This is THE classic nexus trap. Amazon FBA places your inventory in warehouses across multiple states. Each state where Amazon stores YOUR inventory is a state where you have physical-presence nexus for both income and sales tax. Most FBA sellers have nexus in 20+ states without knowing.

Can I dissolve nexus by stopping activity in a state? Yes, but the state’s clock keeps running for the remaining statute of limitations (typically 3-4 years from the last activity year). You’re still on the hook for back tax even after you “leave.”

What does a nexus study cost? For an ETS-style boutique advisory engagement, a nexus study is typically included as part of the Tax Analysis when complexity warrants it. As a stand-alone deliverable, expect $1,500-$5,000 depending on the number of states and the complexity of the analysis.

If you’re running a business with revenue >$300K across multiple states, OR you have any remote employees, OR you’ve crossed $100K of sales in any state outside your home state, you should run a nexus study before the next state notice arrives. The Discovery call is the right first step — we map your current footprint, identify states where you’re already nexus-positive, and lay out a registration or voluntary-disclosure path before back taxes + penalties + interest compound any further.

Sources verified via Numeral economic-nexus state guide, Cherry Bekaert P.L. 86-272 analysis, and the MTC’s revised statement on P.L. 86-272.