State Income Tax vs. State Payroll Tax: What Remote Workers Need to Know

Two distinct categories of state tax show up on every American paycheck: state income tax and state payroll tax. They sound similar, they are withheld by the same payroll system, and they both flow to state governments, but they follow completely different multi-state rules and serve different purposes. Confusing them is one of the most common mistakes in multi-state payroll, and the error can be expensive for both employees and employers.

State income tax is an employee-side tax on wages, withheld by the employer and credited against the employee\'s annual state income tax liability. State payroll tax is an employer-side obligation that funds unemployment insurance, disability insurance, and paid family leave programs; some states also collect an employee-share contribution through payroll. The two taxes follow different rules when an employee crosses state lines, and the result is that a remote worker can have income tax withheld in one state while the employer pays payroll tax in another.

This article separates the two categories, explains the multi-state rules that govern each, and walks through the most common state programs. The goal is to give employees the tools to read their paystub correctly and to give employers the framework to know which state registrations they need for each remote employee.

State income tax (employee-side)

State income tax is the largest state-level tax on wages for most workers. Forty-one states plus the District of Columbia levy a broad-based individual income tax, per the Tax Foundation\'s 2025 data. The tax is calculated using either a flat rate applied to all taxable income or a progressive bracket schedule similar to the federal system. The employer withholds the tax from each paycheck based on the state withholding form the employee completes and remits it to the state revenue department on a regular deposit schedule.

At year-end, the employee files a state income tax return that reconciles the total withholding against the actual annual liability. If too much was withheld, the employee receives a refund. If too little was withheld, the employee pays the balance due, possibly with an underpayment penalty under state equivalents of IRC §6654. The withholding mechanism is therefore a pay-as-you-go system designed to prevent large year-end balances.

The state income tax withholding obligation follows the employee: it depends on where the employee lives, where the employee performs work, whether reciprocity agreements exist, and whether the work state enforces the convenience rule. An employer with an employee in another state generally must register to withhold in that state and remit tax based on the state\'s withholding tables, unless a reciprocity agreement or other exception applies.

State payroll taxes (employer-side)

State payroll taxes are a separate category that funds specific benefit programs. The largest is State Unemployment Insurance (SUI), which is required in every state under the Federal Unemployment Tax Act (FUTA) framework. Employers pay SUI on wages up to a state-specific wage base, at a state-specific rate that varies with the employer\'s experience rating. The federal FUTA tax is 0.6% on the first $7,000 of wages after the state credit, per the IRS.

Beyond SUI, several states operate disability insurance and paid family leave programs funded through payroll tax. California\'s State Disability Insurance (SDI) is the best-known, withholding 0.9% of wages from the employee in 2025 per the California Employment Development Department. New Jersey operates both State Disability Insurance (SDI) and Family Leave Insurance (FLI) with combined employee and employer shares. Washington operates the Paid Family & Medical Leave program and the WA Cares long-term care program, both funded by employee premiums.

Some states also impose employer-paid payroll taxes that are not tied to a benefit program. Washington\'s business & occupation (B&O) tax, while technically a gross receipts tax rather than a payroll tax, is calculated on payroll for service businesses and affects the cost of labor in the state. Texas collects a franchise tax that, while not payroll-based, applies to businesses with employees in the state and influences the effective cost of operating there.

Why they follow different multi-state rules

The crucial insight is that state income tax follows the employee while state payroll tax follows the work. State income tax withholding depends on residency, reciprocity, the convenience rule, and other employee-specific facts. SUI depends on a four-factor test that locates the employment relationship in a single state for unemployment tax purposes, regardless of where the employee lives.

The four-factor test, codified in Section 3306(a) of the Federal Unemployment Tax Act and detailed in the American Payroll Association\'s payroll guidance, applies factors in a specific order. First, where is the work localized — that is, where is the work performed, and is it all in one state or substantially in one state? If the work is entirely or predominantly in one state, that state receives the SUI. If work is split across multiple states, you move to the second factor: where is the employee\'s base of operations, the fixed place to which the employee reports and from which assignments are made?

If the base of operations is unclear, the third factor is direction and control: where is the place from which the employee receives instructions and oversight? If that is also unclear, the fourth factor is the employee\'s state of residence. The test produces a single state for SUI purposes, and that state may be different from the state where income tax is withheld. For example, a Texas resident who performs all work in Texas for a California employer has SUI paid to Texas but may have California income tax withheld only if California enforces a convenience rule for the wages, which it does not.

State-by-state examples

California

California operates the most comprehensive state payroll tax system in the country. Employer-side obligations include SUI (ranging from 1.5% to 6.2% on the first $7,000 of wages per employee, per the EDD), the Employment Training Tax (ETT, 0.1% on the first $7,000), and required participation in the EDD\'s new employer reporting system. Employee-side, California withholds SDI at 0.9% of wages in 2025 on the first $153,164 of wages (the SDI wage base, which is separate from the SUI wage base). California Personal Income Tax (PIT) withholding follows the income tax rules and uses Form DE 4 as the state equivalent of the W-4.

New Jersey

New Jersey operates SUI (employer-side, 0.4% to 5.4% on the first $42,300 of wages), Disability Insurance (employee-side, 0.23% on the first $156,800), Family Leave Insurance (employee-side, 0.06% on the same wage base), and the workforce development program. New Jersey\'s combined employer and employee payroll tax burden is among the highest in the country, and the state enforces a version of the convenience rule for non-resident remote workers. New Jersey also has reciprocity only with Pennsylvania, which means cross-border commuters from New York face the full multi-state withholding picture.

Washington

Washington has no state income tax but operates three significant payroll tax programs. Workers\' Compensation (administered through the Department of Labor & Industries, or L&I) is funded by employer and employee contributions based on industry risk classification. Paid Family & Medical Leave is funded by employee premiums of 0.74% of wages (with a small employer share for employers with 50 or more employees) on wages up to the Social Security wage base. WA Cares, the long-term care program, is funded by a 0.58% employee premium on all wages, with exemptions available for certain workers.

New York

New York operates SUI (employer-side, ranging from 2.1% to 9.9% on the first $12,500 of wages per employee, per the New York Department of Labor) and a separate Paid Family Leave program funded by a 0.388% employee contribution on wages up to the annual Social Security wage base. New York State income tax withholding follows the convenience rule aggressively, which means an out-of-state remote worker for a New York employer may have New York income tax withheld while the SUI is paid to the worker\'s home state under the four-factor test.

How remote work changes the picture

Remote work creates the most interesting payroll tax scenarios because the income tax and payroll tax obligations can diverge. Consider a worker who lives in Pennsylvania, works entirely from home in Pennsylvania, but is employed by a New Jersey company. Under the Pennsylvania-New Jersey reciprocity agreement, the worker files Form NJ-165 to claim exemption from New Jersey income tax withholding, and the employer withholds only Pennsylvania income tax. However, the employer must still register for New Jersey SUI because the localization test arguably places the work in Pennsylvania but the base of operations and direction and control may still be in New Jersey.

The opposite divergence happens when an employee moves but the employer is slow to update registrations. A worker who moves from California to Texas mid-year may stop having California income tax withheld (because they are no longer a California resident and no longer performing work in California), but the employer may continue paying California SUI on the worker\'s wages if the four-factor test still points to California for the remainder of the year. The worker\'s paystub will show no California state income tax line, but the employer is still incurring California SUI cost.

The reverse situation is also common. A remote worker hired by a Texas employer to work from California creates immediate California nexus. The employer must register for California SUI, California PIT withholding, and the EDD\'s new hire reporting system, even though the employer has no California office. Failing to register on time triggers California penalties that can run into the thousands of dollars per employee per quarter.

What employees should check on their paystub

Every paystub contains a set of line items that, taken together, tell you which state programs apply to you. The first is federal income tax withholding, which is straightforward. The second is the state income tax withholding line, which should specify the state code (e.g., CA, NY, TX). For remote workers, the state code on this line is the single most important fact on the paystub — it tells you which state is currently receiving tax on your wages.

The third line to check is Social Security and Medicare, which are federal and do not vary by state. The fourth is any state disability or paid family leave line, which only appears if you work in a state that operates such a program (CA, NJ, NY, RI, WA, and others). The fifth is any local tax line, which applies in cities like New York City, Yonkers, Philadelphia, and a handful of others. The absence of an expected line or the presence of an unexpected one is a signal to ask HR.

If you work remotely, ask HR which state SUI account is on file for you. This is not visible on your paystub but is recorded in the employer\'s payroll system and on your W-2 in Box 14 (sometimes labeled UI). Mismatched SUI state and income tax state is common in remote-work situations and is usually not a problem, but it can become one if either state audits the employer. Confirming the setup is a five-minute conversation that can prevent multi-year cleanup.

What employers must register for in each state

Employers hiring their first employee in a new state face a registration checklist that varies by state but generally includes four items. First, register for state income tax withholding with the state revenue department. Second, register for SUI with the state workforce agency (in California this is the EDD; in New York it is the Department of Labor; in Texas it is the Texas Workforce Commission). Third, register for any state disability or paid family leave programs if applicable. Fourth, register for the state new-hire reporting program, which is required under federal law.

Some states add additional requirements. California requires registration with the EDD for employer payroll tax account purposes, which covers SUI, PIT withholding, ETT, and SDI in a single account. Washington requires registration with the Department of Revenue for B&O tax, with L&I for workers\' compensation, and with the Employment Security Department for Paid Family & Medical Leave. New Jersey requires registration with the Department of Labor for SUI and with the Division of Taxation for income tax withholding.

The registration timeline matters. Most states require registration before the first payroll that includes an employee in the state. Late registration triggers penalties that compound with each late quarter. The safest practice is to register as soon as the offer is accepted, not when the employee starts. For a deeper walkthrough, see our registration playbook and our state-by-state registration reference.

What to do next

For employees, the next step is to pull your most recent paystub and audit the state lines using the framework above. If anything looks off, schedule a brief call with your payroll contact. For employers, the next step is to inventory every state where you have employees and confirm that you hold the correct registrations in each. Our employer compliance checklist walks through this audit step by step.

For a deeper look at how the income tax side works in multi-state situations, including reciprocity and the convenience rule, see our multi-state withholding guide. And to model the actual dollar impact of different scenarios, run your numbers through our multi-state withholding calculator, which handles both income tax and SUI side-by-side.