Withholding in Multiple States: 2026 Business Guide

Withholding in Multiple States: 2026 Business Guide

Withholding in Multiple States: 2026 Business Owner Guide

If your business operates in more than one state, withholding in multiple states is one of your most complex payroll obligations in 2026. Remote work, multi-location businesses, and traveling employees can trigger withholding duties in states you may not have registered in yet. The IRS updated Publication 15 for 2026 to reflect the One Big Beautiful Bill Act (OBBBA), which introduced key changes that affect employer payroll compliance. Understanding these rules now can save your business thousands in penalties. Our team at Uncle Kam for Business Owners helps companies navigate these obligations every day.

Table of Contents

• Key Takeaways
• What Is Multi-State Withholding and Why Does It Matter?
• When Does Withholding in Multiple States Apply to Your Business?
• How Do State Reciprocity Agreements Work?
• How Do You Register for Withholding in a New State?
• What Are the W-2 Reporting Requirements for Multiple States?
• How Does the OBBBA Change Multi-State Withholding in 2026?
• What Are the Most Common Multi-State Withholding Mistakes?
• Uncle Kam in Action: Multi-State Business Owner Saves Big
• Next Steps
• Related Resources
• Frequently Asked Questions

Key Takeaways

• Withholding in multiple states is required when employees work or perform services in states where your business has nexus.
• About 30 states have reciprocity agreements that can simplify withholding for employees who live in one state but work in another.
• The 2026 IRS Publication 15 updated withholding guidance to reflect the One Big Beautiful Bill Act (OBBBA), including new tip and overtime income rules.
• Employers must register for a withholding account in each state before making any payroll payments to employees in that state.
• Missing multi-state withholding obligations can trigger back taxes, interest, and penalties in multiple jurisdictions simultaneously.

What Is Multi-State Withholding and Why Does It Matter?

Withholding in multiple states means your business collects and remits state income taxes in every jurisdiction where your employees perform work. This obligation is separate from federal withholding. It applies regardless of where your company is headquartered. The rules vary significantly from state to state, which makes this one of the trickiest areas of payroll compliance for growing businesses.

For 2026, the stakes are higher than ever. The IRS and state tax authorities are using more automated tools to cross-reference payroll data. In fact, the IRS closed nearly 987,000 cases under its Automated Underreporter Program in fiscal year 2025, resulting in $5.9 billion in additional assessments. States are following similar enforcement approaches. Therefore, errors in multi-state withholding can quickly attract attention from both federal and state auditors.

Why Remote Work Made This More Complex

Remote work has permanently changed multi-state withholding for business owners. Before 2020, most employees worked in a fixed location. Today, many employees work from home states that differ from their employer’s home state. Consequently, business owners now face withholding in multiple states they may have never previously considered. Each time an employee logs in from a new state and performs work there, your withholding obligations may change.

Moreover, some states have enacted specific rules for remote workers. New York, for example, uses a “convenience of the employer” rule. Under this rule, if a remote employee works from home for their own convenience — not because the employer required it — their income may still be taxed in New York. This is one reason why proactive tax strategy is essential before hiring remote employees.

States With No Income Tax

Nine states currently have no state income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. However, New Hampshire taxes interest and dividends, and Washington applies a capital gains excise tax on high earners. Employers with employees in these states still have federal withholding obligations. However, they do not need to register for state income tax withholding in those nine states. This is one of the reasons some business owners choose to hire remote employees located in these states.

When Does Withholding in Multiple States Apply to Your Business?

The key concept in multi-state withholding is nexus. Nexus is the legal connection between your business and a state that creates a tax obligation. For payroll purposes, nexus is usually established when an employee physically performs work in a state. This is different from sales tax nexus, which can arise from economic activity alone.

Common Situations That Trigger Multi-State Withholding

• Remote employees: An employee who lives and works in a different state than your business headquarters.
• Business travelers: Employees who travel to other states for work meetings, sales calls, or project work.
• Multi-location businesses: Retail stores, service companies, or offices in more than one state.
• Construction and project work: Contractors and employees sent to complete jobs in other states.
• Work-from-anywhere policies: Employees who temporarily work from vacation homes or other locations in different states.

Day Thresholds and De Minimis Rules

Several states offer relief for occasional travelers. Some states have a de minimis rule: if an employee works in a state for fewer than a set number of days — often 10, 14, or 30 days — the employer does not need to withhold state income tax. However, these thresholds vary widely. Furthermore, not all states offer this relief at all. Illinois, for example, requires withholding on every dollar earned in the state from day one, with no threshold exemption. Business owners must therefore check each state’s specific rules.

The following table provides a general overview of how day thresholds work across select states. Always verify current thresholds with each state’s department of revenue, as rules can change. For the 2026 tax year, some states updated their thresholds as part of broader tax reform efforts.

State	De Minimis Day Threshold	Notes
California	No threshold (all days)	Withhold from first day worked in state
New York	No threshold (all days)	“Convenience of employer” rule applies
Illinois	No threshold (all days)	Withhold from first day of work in state
Oregon	Approximately 30 days	Verify current threshold with Oregon DOR
Arizona	60+ days (general)	Verify exact threshold with Arizona DOR

This information is current as of 6/9/2026. Tax laws change frequently. Verify updates with state revenue departments and IRS.gov if reading this later.

How Do State Reciprocity Agreements Work?

State reciprocity agreements are formal contracts between neighboring states. They are designed to reduce the tax burden on employees who commute across state lines. Under a reciprocity agreement, an employee who lives in State A but works in State B only owes income tax to State A. The employer only withholds for the employee’s home state. This dramatically simplifies withholding in multiple states when the agreement applies.

Which States Have Reciprocity Agreements?

Approximately 30 states participate in reciprocity agreements with at least one neighboring state. Some of the most commonly used agreements include those between:

• Virginia, Maryland, Washington D.C., West Virginia, and Pennsylvania
• Indiana, Kentucky, Michigan, Ohio, and Wisconsin
• Illinois and Iowa, Kentucky, Michigan, and Wisconsin
• New Jersey and Pennsylvania
• Minnesota and North Dakota

However, not every state pair has a reciprocity agreement. Notably, California has no reciprocity agreements with any other state. New York also has no agreements. Therefore, if your employee lives in New Jersey and works in New York, both states may require withholding unless the employee files an exemption certificate in the work state. You can review current reciprocity agreements through each state’s department of revenue. The U.S. Department of Labor also provides general guidance on interstate employment issues.

How to Apply a Reciprocity Agreement in Payroll

To use a reciprocity agreement, the employee must first file an exemption certificate with the employer. This form — which varies by state — tells the employer to withhold only for the employee’s home state. Common examples include Form IT-4NR (Ohio), Form WH-47 (Indiana), and Form MW-507 (Maryland). The employer keeps this form on file and adjusts withholding accordingly. Without this form, the employer must withhold for the work state, even if a reciprocity agreement exists. Therefore, collecting and storing these forms is a critical payroll compliance step.

How Do You Register for Withholding in a New State?

Registering for multi-state withholding is not optional. Most states require employers to register before they issue the first paycheck to any employee working in that state. The registration process involves applying for an Employer Identification Number (EIN) in that state, separate from your federal EIN. Most states allow online registration through their department of revenue or taxation websites. The timeline to receive a state withholding account number can range from a few days to several weeks, depending on the state.

Step-by-Step Registration Process

1. Determine nexus: Confirm that your employee’s activities actually create a withholding obligation in the state.
2. Gather required information: You will need your federal EIN, business legal name, business address, and projected payroll amounts.
3. Visit the state revenue department website: Most states have an online business registration portal.
4. Complete the employer registration application: This typically takes 15-30 minutes online.
5. Receive your state withholding account number: Save this number for all future filings and deposits.
6. Set up payroll system for state withholding: Update your payroll software to withhold and deposit the correct state taxes on time.
7. Track deposit due dates: States vary on deposit frequency — monthly, semi-weekly, or quarterly.

Some states also require you to register for unemployment insurance (SUI) separately. Additionally, states like California have a separate Employment Development Department (EDD) for payroll-related registrations. Therefore, the registration process can involve multiple agencies within one state. Working with a professional who specializes in business payroll solutions can streamline this process significantly.

What Happens If You Don’t Register?

Failure to register for multi-state withholding can result in severe consequences. States can assess back taxes for all unwithheld amounts, plus interest and penalties. In some cases, penalties include both a failure-to-withhold penalty and a failure-to-deposit penalty. For a business with employees in five or six states, unregistered obligations can accumulate into six-figure liabilities quickly. Furthermore, employees may owe back taxes and penalties in their work state if you failed to withhold correctly. This damages employee relationships and exposes your business to legal risk.

What Are the W-2 Reporting Requirements for Multiple States?

The IRS finalized the 2026 general instructions for Forms W-2 and W-3 on January 30, 2026. These forms are the primary reporting mechanism for wages and tax withholding. When an employee works in multiple states, their W-2 must reflect wages and withholding for each state separately. Box 15 (State), Box 16 (State wages), and Box 17 (State income tax) must be completed for each state where wages were earned.

How to Allocate Wages Across Multiple States

Wage allocation is the process of dividing an employee’s total wages among the states where they worked. There are two common methods:

• Days method: Allocate wages based on the proportion of days worked in each state. If an employee worked 200 days total and 50 days in State B, then 25% of wages are allocated to State B.
• Hours method: Similar to the days method but uses hours worked in each state instead of days. This is more precise for employees with irregular schedules.

Maintaining accurate records of where each employee works each day is therefore essential. Many payroll systems now have built-in features to track employee work locations. However, manual tracking is still common in smaller businesses. Consider using a simple spreadsheet or time-tracking tool to record employee location data throughout the year. This makes W-2 preparation at year-end much simpler.

Filing W-2s With Multiple States

Most states participate in the Social Security Administration’s W-2 reporting system or require direct filing with the state. Some states require employers to file W-2s directly with the state revenue department in addition to the federal filing. Others accept the federal W-2 data through combined filing programs. Check each state’s specific requirements, as non-compliance with state W-2 filing rules can result in penalties separate from the federal penalties.

How Does the OBBBA Change Multi-State Withholding in 2026?

The One Big Beautiful Bill Act (OBBBA) is the most significant tax legislation in several years. It took effect for the 2026 filing season, and the IRS updated its 2026 Publication 15 to reflect several new provisions. During the 2026 filing season, approximately 45% of all individual returns claimed at least one of the new Working Families Tax Cut deductions, including breaks on tips, overtime, and car loan interest. These changes affect payroll withholding calculations directly.

Tips and Overtime Exclusions Under OBBBA

The OBBBA created federal exclusions for certain tip income and overtime pay. This means some amounts that were previously fully taxable at the federal level are now excluded from federal income. However, not all states have automatically adopted these exclusions. Therefore, for multi-state employers, the withholding calculation may now differ between federal and state levels. For instance, you may need to withhold zero federal income tax on qualifying tip income but still withhold the full state income tax on that same amount.

This creates a new layer of complexity in withholding in multiple states for 2026. Employers with tipped employees — such as restaurants, hospitality companies, and service businesses — must carefully track which states conform to the OBBBA tip exclusion. States that do not conform require full state income tax withholding on tip income even though federal withholding may be reduced or eliminated.

SALT Deduction Changes and Their Employee Impact

The OBBBA also raised the State and Local Tax (SALT) deduction cap to $40,000 for 2026, up from $10,000 in 2025 ($20,000 if married filing separately, subject to income-based limits). This change is significant for employees who itemize deductions and pay taxes in high-tax states. Employees in states like California, New York, and Illinois now have more room to deduct state income taxes on their federal returns. However, this does not change the employer’s withholding obligation. Employers still must withhold based on each state’s current tax rates and rules.

OBBBA Provision	Federal Impact for 2026	Multi-State Withholding Consideration
Tip income exclusion	Qualifying tips may be excluded from federal income tax	State conformity varies; check each work state
Overtime pay exclusion	Qualifying overtime may be excluded from federal income tax	States may not conform; state withholding may remain unchanged
SALT deduction cap raised to $40,000	More state taxes deductible on federal return	Does not change employer withholding obligations
Expanded HSA eligibility	More employees can contribute to HSAs via payroll	Pre-tax HSA deductions reduce taxable wages in all states
Car loan interest deduction	Employees can deduct vehicle loan interest	No direct impact on withholding; affects year-end filing

For 2026 compliance, business owners should consult the updated IRS Publication 15 and verify state conformity with OBBBA provisions before adjusting payroll systems. Our team offers comprehensive tax advisory services to help multi-state employers navigate these 2026 changes efficiently.

What Are the Most Common Multi-State Withholding Mistakes?

Even experienced business owners make costly errors with multi-state payroll. These mistakes are easy to make because the rules are complex and each state operates differently. Understanding the most common pitfalls helps you avoid them in 2026.

Mistake 1: Ignoring Remote Worker Location Changes

Many business owners set up payroll for a remote employee’s original home state and never revisit it. However, employees move. When an employee relocates to a new state, your withholding obligations change immediately. Always have a written policy requiring employees to notify HR when they change their home state or plan to work from a new state for an extended period. This is one area where proactive tax planning makes a big difference.

Mistake 2: Assuming Reciprocity Always Applies

Reciprocity agreements are not universal. Some employers assume that if two neighboring states exist, a reciprocity agreement must cover their employees. This is not the case. Moreover, reciprocity agreements can be terminated. Pennsylvania and New Jersey, for example, have had ongoing discussions about their agreement over the years. Always verify that a reciprocity agreement is currently active and applies to the specific states involved. Check with the state’s department of revenue directly rather than relying on outdated sources.

Mistake 3: Not Tracking Business Travel Days

When employees travel to other states for business, those travel days can create withholding obligations. Many small businesses do not track these days at all. However, states actively audit business travelers, especially high-income employees such as executives, salespeople, and consultants who travel frequently. Implement a travel log system that records the state visited, the purpose of travel, and the number of days spent. This documentation protects your business during an audit. Our team at Uncle Kam Tax Prep helps business owners build these systems proactively.

Mistake 4: Missing State Deposit Deadlines

Each state sets its own deposit schedule for withheld taxes. Some states require monthly deposits, others require semi-weekly deposits for larger payrolls, and some allow quarterly deposits for small employers. Missing a deposit deadline triggers immediate penalties and interest in most states. These penalties add up fast, especially if you have multiple states. Create a compliance calendar at the start of each year listing every state deposit deadline alongside your federal deposit obligations.

 

 

Uncle Kam in Action: Multi-State Business Owner Saves Big

Client Snapshot: Marcus owns a mid-size IT services company headquartered in Illinois. His business employs 28 people, including 14 remote workers spread across six states — Illinois, Wisconsin, Indiana, Ohio, Georgia, and Colorado.

Financial Profile: Annual payroll of approximately $2.1 million. Gross business revenue of $4.8 million for the 2026 tax year.

The Challenge: Marcus came to Uncle Kam after receiving notices from three states — Indiana, Ohio, and Georgia — demanding back withholding taxes, penalties, and interest. He had registered for payroll in Illinois and Wisconsin but had never registered in the other states where his remote workers were located. He also had two traveling sales managers who spent significant time in Colorado and Georgia throughout the year, which added to his unregistered exposure. His total estimated liability before consulting Uncle Kam was over $87,000 in back taxes and penalties across three states.

The Uncle Kam Solution: Uncle Kam conducted a full multi-state payroll nexus review. We identified all states where employees were working and created a registration and compliance plan. We used Illinois’ reciprocity agreements with Indiana, Wisconsin, Ohio, and Michigan to simplify withholding for employees covered by those agreements. We then registered Marcus’s business in Georgia and Colorado, set up proper payroll withholding, and negotiated penalty abatement with Indiana and Ohio, citing first-time abatement provisions and reasonable cause. Furthermore, we implemented a travel tracking system for the sales managers going forward.

The Results:

• Back tax liability reduced: From $87,000 to $41,000 through penalty abatement and proper documentation
• Ongoing annual savings: $14,000 per year through proper reciprocity agreement utilization
• Investment in Uncle Kam: $8,500 for full review, registration, abatement negotiations, and system setup
• First-Year ROI: Over 5x return on investment, saving more than $46,000 in year one

Marcus now has full multi-state payroll compliance and peace of mind. His team uses Uncle Kam’s systems to track employee locations automatically. See more stories like Marcus’s on our client results page.

Next Steps

If your business has employees in multiple states — or is planning to add remote workers — take these actions now for 2026 compliance. Our tax strategy team can guide you through every step.

1. Audit your current payroll setup to identify all states where employees are working.
2. Check for reciprocity agreements between each employee’s home state and work state.
3. Register for state withholding accounts in any unregistered states immediately.
4. Update your W-2 process to reflect multi-state wages and withholding accurately.
5. Review how the OBBBA tip and overtime exclusions affect your state withholding calculations in 2026.

Related Resources

• Tax Preparation and Filing Services for Business Owners
• Business Payroll and Bookkeeping Solutions
• Uncle Kam Tax Strategy Blog
• Tax Calculators for Business Owners
• General Tax FAQs

Frequently Asked Questions

Does withholding in multiple states mean my employees pay double taxes?

No. Most states provide a tax credit for taxes paid to other states, which prevents true double taxation. However, employers must still withhold correctly for each state where work is performed. The employee later claims a credit on their home state return for taxes paid to the work state. Without proper withholding, employees end up owing large balances at tax time, which creates significant frustration and damages your employer relationship. Therefore, getting multi-state withholding right protects both your business and your employees.

What form does an employee complete for a reciprocity agreement?

Each state that is part of a reciprocity agreement has its own exemption certificate form. For example, Virginia uses Form VA-4, Maryland uses Form MW-507, and Indiana uses Form WH-47. The employee files this form with their employer, not with the state. The employer keeps it on file and uses it to justify withholding only for the employee’s home state. Employees must file a new form if they move or if their residency situation changes. Employers should review these forms annually during open enrollment or at the start of each tax year.

How does withholding in multiple states affect my quarterly estimated tax payments?

Quarterly estimated tax payments are primarily an individual taxpayer obligation, not an employer withholding issue. However, if you are a business owner who also draws income from the business — such as an S Corp distribution or pass-through income — you may owe estimated taxes to multiple states based on where your business earns income. For 2026, the estimated tax payment due dates are April 15, June 15, September 15, and January 15, 2027. The June 15, 2026 payment date has already passed. Your next estimated payment is due September 15, 2026. Consult our tax advisory team to calculate your multi-state estimated obligations accurately.

Can my business owe state income tax withholding even if I have no physical office in a state?

Yes. The withholding obligation is primarily triggered by where your employees physically perform work — not where your office is located. If a remote employee works from their home in Texas, you likely have no withholding obligation in Texas because Texas has no state income tax. However, if an employee works from California, you must withhold California state income tax regardless of where your office is. Additionally, some states have rules that extend withholding obligations based on where services benefit the employer, even without a physical office presence. Check the specific nexus rules for each state where your employees work.

What is the best way to track multi-state withholding for a small business?

The best approach for small businesses is to use payroll software that supports multi-state withholding. Platforms like Gusto, ADP, and Paychex have built-in multi-state compliance features. However, even with software, you must feed the system accurate data about where each employee works each pay period. Additionally, implement a policy requiring employees to report location changes and travel to other states lasting more than a few days. Keep copies of all state registration certificates, exemption forms from reciprocity agreements, and employee location records in your payroll files. These records are critical during an audit. Working with an experienced business tax advisor ensures your payroll system is set up correctly from the start.

How does the OBBBA affect my multi-state withholding calculations for 2026?

The One Big Beautiful Bill Act introduced federal exclusions for qualifying tip income and overtime pay in 2026. These exclusions reduce the federal taxable wages for affected employees. However, many states have not conformed to these exclusions. As a result, you may need to calculate separate federal and state taxable wages for the same employee in the same pay period. For example, an employee who earns $500 in qualifying tips may have zero federal income tax withheld on those tips, but you still must withhold state income tax in states that have not adopted the OBBBA tip exclusion. The IRS 2026 Publication 15 provides detailed guidance. Always verify state-specific conformity rules with each state’s department of revenue before implementing payroll changes.

Last updated: June, 2026