The Netchex Definitive Guide to Multi-State Payroll Taxation (2026)

When an employee lives in one state but works in another, both states may have tax authority over the employee’s income. The general rule is that the work state (where services are performed) has the first right to tax wages, and the residence state may also tax the employee’s income because the employee lives there. To prevent double taxation, most states allow a tax credit for taxes paid to another state.

For example, an employee who lives in New Jersey but works in New York will typically have New York nonresident tax withheld, and wages reported to New York. When the employee files their New Jersey resident tax return, they usually receive a credit for the tax already paid to New York. This prevents employees from being taxed twice on the same income. However, if the states payhave a reciprocal agreement, payroll may only withhold tax for the employee’s home state.

References 

Source: IRS State Income Tax Issues for Employers 

Source: PayrollOrg Multi-State Taxation Overview 

A reciprocal tax agreement allows employees who work across state lines to pay income tax only in their state of residence rather than in both the work state and home state. These agreements simplify payroll administration considerably.

Without reciprocity, the employer withholds tax in the work state and the employee claims a credit in their residence state. With reciprocity, the employer withholds tax only in the employee’s home state. For example, an employee who lives in Pennsylvania but works in New Jersey would not have New Jersey tax withheld because these states have a reciprocal agreement; instead, only Pennsylvania tax is withheld.

Employees must usually submit a reciprocity exemption form to the employer to stop withholding in the work state. States with reciprocal agreements include Illinois, Indiana, Kentucky, Maryland, Michigan, Pennsylvania, Wisconsin, and Virginia. Failure to apply reciprocity correctly can result in incorrect withholding and employee tax refunds or liabilities.

References 

Source: PayrollOrg Reciprocity Map 

Source: Tax Foundation State Reciprocity Agreements 

Tax residency determines which state considers the employee a resident taxpayer. Most states use one or more of the following factors: domicile (the employee’s permanent home or where they intend to return), physical presence (many states consider someone a resident if they spend more than 183 days in the state during the year), and intent (as evidenced by driver’s license, voter registration, property ownership, or where family resides).

Payroll departments typically rely on the employee’s primary home address, but tax residency is ultimately determined by state law and the employee’s tax filing. Employees may also be classified as full-year residents, part-year residents, or nonresidents, and these classifications affect how their wages are taxed.

References 

Source: IRS Residency and State Taxation 

Source: Tax Foundation State Residency Rules 

When an employee relocates during the year, wages must be allocated between states based on when the work occurred. Payroll should update the employee’s work location and address, stop withholding in the previous state, begin withholding in the new state, and track wages earned in each location.

For example, if an employee moves from Texas to California on July 1, payroll records January through June wages to Texas and July through December wages to California. The employee will typically file part-year resident returns in both states. On the employee’s W-2, wages must be reported separately for each state.

References 

Source: Experian Employer Services Multi-State Payroll Tax Compliance 

Remote work is one of the biggest drivers of multi-state payroll complexity. The primary rule is that payroll taxes are generally based on where the employee physically performs work. If an employee works remotely from another state, the employer may need to register for payroll taxes in that state, withhold state income tax, pay state unemployment tax, and follow labor laws for that state.

For example, a company headquartered in Florida that hires a remote worker in Colorado must typically register for Colorado payroll taxes, withhold Colorado income tax, and pay Colorado unemployment tax. Even one remote employee can create tax nexus, meaning the company now has tax obligations in that state.

References 

Source: Remote.com Multi-State Payroll Compliance 

When employees work in multiple states within a pay period, wages must be allocated between those states based on where work occurred. Common allocation methods include days worked, hours worked, and work location tracking. For example, if an employee works three days in Illinois and two days in Indiana, payroll may allocate 60 percent of wages to Illinois and 40 percent to Indiana, then withhold taxes accordingly. Some states have minimum workday thresholds before withholding is required.

References 

Source: PayrollOrg Multi-State Payroll Withholding 

In most cases, yes. Employers must register for payroll tax accounts in any state where employees perform work or the company has tax nexus. Typical registrations include a state income tax withholding account and a state unemployment insurance account. Even a single employee working remotely in a state may require registration.

References 

Source: IRS Employer State Tax Responsibilities 

Payroll administrators should follow a structured setup process. First, confirm the employee’s work location and residence state. Second, check whether the states have a reciprocal tax agreement. Third, register the employer with the state tax department and unemployment insurance agency. Fourth, collect employee tax forms including state withholding forms and reciprocity exemption forms where applicable. Fifth, configure payroll software with the correct state tax code, local tax codes, and wage allocation rules. 

Employees who temporarily work in another state can still create tax obligations. Some states require withholding after a certain number of days worked there. This applies to roles like construction workers, consultants, and traveling sales staff. Employers should track employee travel days and the location where work was performed. Failure to track this information may result in under-withholding. 

Payroll systems must allocate wages based on where work was performed. Common methods include tracking days worked per state, hours worked per state, and work location data. Once wages are allocated, payroll applies the appropriate state tax rates and withholding tables for each jurisdiction.

References 

Source: PayrollOrg Multi-State Payroll Compliance 

When employees work in multiple states, the W-2 must report state wages and tax amounts separately. Boxes 15 through 17 of the W-2 include the state name, state wages, and state income tax withheld. For example, if an employee earned $40,000 in New York and $20,000 in New Jersey, each state must appear as a separate entry on the W-2.

References 

Source: IRS W-2 Instructions 

Yes. Most states require employers to register and file payroll taxes if they have even one employee working in the state. This includes both withholding tax filings and unemployment tax filings. 

Nexus refers to the connection that triggers tax obligations in a state. Employees working in a state can create nexus because they perform services, generate income for the company, and represent the business there. Once nexus exists, employers must comply with that state’s payroll tax rules.

References 

Source: Tax Foundation Business Nexus Rules 

Incorrect withholding can lead to tax penalties, interest charges, employer liability for unpaid tax, and the need to file amended W-2s. Employees may also face tax issues if withholding is applied to the wrong state.

References 

Source: IRS Employer Penalties Guide 

Some cities and counties impose local payroll taxes in addition to state taxes. Examples include Ohio municipal income taxes, Pennsylvania local earned income tax, and the New York City resident tax. Payroll must track both the employee’s work city and residence city to calculate these correctly.

References 

Source: Tax Foundation Local Income Taxes 

Traveling employees may owe tax in any state where they perform work. Employers must track the location of work and the number of days worked in each state. Certain states have day thresholds before withholding applies, so tracking is essential to determine when an obligation is triggered. 

Employers should allocate wages based on where work was performed each day. Payroll systems should track employee location through time tracking systems, expense reports, and project assignments in order to make accurate daily allocations. 

Yes. Many states apply special withholding rules for supplemental wages including bonuses, commissions, and severance pay. Some states use flat withholding rates for supplemental wages. California, for example, uses specific supplemental wage withholding rules that differ from the standard withholding method. 

Employers should maintain documentation including state withholding forms, reciprocity exemption forms, employee address records, travel records, time tracking data, and tax registrations. These documents help support payroll compliance during audits and substantiate wage allocations across states.

References 

Source: IRS Employer Tax Guide Publication 15 

The most common compliance risks include failing to register in new states, applying incorrect withholding, missing local tax requirements, and not tracking employee work locations. Organizations frequently underestimate the complexity of multi-state payroll when hiring remote employees, which can result in penalties, interest, and amended filings across multiple jurisdictions.