State Income Tax Withholding for Remote Employees: The 2026 Employer Guide

Your company is in California. Your new hire is in North Carolina. Which state’s income tax do you withhold?

The answer is usually simple: withhold where the employee physically works. But “usually” is doing a lot of heavy lifting in that sentence. Reciprocity agreements, convenience of the employer rules, and de minimis thresholds can all change which state gets the money. And several of those rules changed in 2025 and 2026.

This guide covers the withholding determination question: which state gets the tax, and when the answer is not obvious. If you need help with what happens after you know which state to withhold for (registration, SUI, workers’ comp, I-9s), we have two companion guides:

→ State Nexus and Payroll: When Hiring Remote Creates Tax Obligations

→ Your First Out-of-State Hire: A Step-by-Step Checklist

Which state do I withhold income tax for a remote employee?

The general rule: employers must withhold state income tax in the state where the employee physically performs their work. Not where the company is headquartered. Not where the employee was hired. Where they sit and do the job.

For a fully remote employee working from their apartment in Denver, that means Colorado. Even if your office is in New York and the role was posted as a “New York” position. The physical location of work controls the withholding obligation.

Forty-one states plus the District of Columbia levy taxes on wage income. Nine states have no individual income tax on wages:

• Alaska
• Florida
• Nevada
• New Hampshire
• South Dakota
• Tennessee
• Texas
• Washington
• Wyoming

If your remote employee works in one of those nine, there is no state income tax to withhold. You still have other obligations in those states. See our nexus guide for what else gets triggered.

Where it gets complicated is when multiple states have a claim to the same income. Three sets of rules create most of the confusion: reciprocity agreements, convenience of the employer rules, and de minimis thresholds.

How do reciprocity agreements affect withholding?

A reciprocity agreement is a deal between two states that says: we will only tax our own residents. If your employee lives in State A and commutes to (or would otherwise owe tax in) State B, and those two states have a reciprocity agreement, you only withhold for State A.

This matters most for employees who live near state borders or split time between states. It eliminates the need for the employee to file a nonresident return in the work state, and it simplifies your payroll because you only calculate withholding for one state.

There are currently about 30 reciprocal agreements across 15 states plus DC. Here are the key ones:

Note on reverse credit states: You may see Arizona, California, Indiana, Oregon, and Virginia listed as having “reciprocity” in some sources. These states actually use a reverse credit system, where the nonresident state (not the home state) provides the tax credit. The practical difference matters: employees still have to file returns in both states, and they may still owe the higher of the two states’ rates. The Tax Foundation does not classify reverse credit arrangements as true reciprocity agreements.

Important: 25 states with income taxes have zero reciprocity agreements. New York, California, Massachusetts, and Connecticut are all in this group. If your employee lives in New Jersey and works (or is deemed to work) in New York, there is no reciprocity. New York will tax that income, and New Jersey provides a credit for taxes paid to New York to prevent double taxation.

Employer action: When reciprocity applies, the employee must file a state-specific exemption certificate with you. For example, an Ohio resident working in Pennsylvania would submit Pennsylvania’s REV-419 form. Until you have that form on file, you are required to withhold for the work state regardless of reciprocity. Keep these forms in your payroll records.

What is the convenience of the employer rule and which states enforce it?

The convenience of the employer rule flips the default. Under normal rules, you withhold where the employee works. Under this rule, certain states say: if the employee works remotely for their own convenience rather than out of employer necessity, the income is still taxable in the state where the employer’s office is located.

Translation: if your office is in New York and your employee works from home in New Jersey because they prefer it, New York may still claim the right to tax that income. The employee’s physical location does not control. The employer’s location does.

Eight states currently enforce some version of this rule:

New York is the one that creates the most headaches. In May 2025, the Tax Appeals Tribunal upheld the convenience rule in the Zelinsky case, finding that most remote work does not qualify as employer necessity. The tribunal specifically said that hiring someone remotely because that is where the candidate lives is not sufficient. An appellate challenge is expected, so this is still a live issue.

Connecticut’s version only kicks in if the employee’s home state also has a convenience rule. So a Connecticut employer with a remote worker in Ohio would not trigger it, because Ohio does not have its own COE rule. But a Connecticut employer with a remote worker in New York would.

New Jersey’s rule, enacted in July 2023, works similarly. It only applies to residents of states with their own convenience rules (currently New York, Delaware, and Nebraska). New Jersey also created an interesting incentive: if an employee successfully challenges New York’s convenience rule and receives a refund, New Jersey gives them a 50% credit on what they would then owe NJ.

What this means for you:

• If your company has any office, registered address, or operational presence in a COE state, you may owe withholding to that state for employees who never set foot there.
• Two states may both claim taxing rights on the same income. Most states resolve this through credit mechanisms so the employee does not pay double, but it creates real administrative complexity on the payroll side.
• If you are in this situation, talk to a tax advisor about your specific setup. COE rules interact with reciprocity agreements and credits in ways that vary by state pair.

→ See how Warp handles compliance for you

When does withholding kick in? De minimis thresholds by state

If your employees travel between states (even occasionally), the question becomes: how many days can someone work in a state before you owe withholding there? The answer depends entirely on the state.

Twenty-one states plus DC have no de minimis threshold. California, Massachusetts, Pennsylvania, Kentucky, and others technically require withholding from day one. One day at a client site, one day working from a hotel during a layover, one day at a conference. This is rarely enforced for single-day visits, but the legal obligation exists.

Other states offer safe harbors:

Some thresholds come with a mutuality requirement, meaning they only apply if the employee’s home state offers a reciprocal threshold. Alabama’s new 30-day safe harbor (October 2025) has this requirement. Louisiana’s upgraded threshold (January 2026) does not, which is why it jumped from 28th to 12th on the NTUF’s ROAM Index.

Practical advice: For fully remote employees who stay put, de minimis thresholds are less relevant. The bigger risk is employees who travel. If your sales team visits clients across state lines, or if employees attend multi-day conferences in other states, you should track working days by location. The simplest approach: ask employees to log their work location when it differs from their home state, and review quarterly.

What changed in 2025 and 2026? New laws employers should know

Several states made significant changes to remote worker withholding rules over the past year. If you set up your multi-state payroll before 2025, some of your assumptions may be outdated.

Alabama HB 379 (effective October 1, 2025)

Created a 30-day safe harbor for nonresident employees. If a remote worker spends fewer than 30 days in Alabama, no withholding is required. The catch: it includes a mutuality requirement, meaning the employee’s home state must offer a similar threshold. Alabama also continues to enforce its convenience of the employer rule, so remote workers for Alabama-based companies may still owe Alabama tax regardless of where they sit.

Louisiana HB 567 (effective January 1, 2026)

Increased the safe harbor from 25 to 30 days and, crucially, removed the mutuality requirement. This means Louisiana’s threshold applies to all nonresident workers regardless of their home state’s rules. This is one of the most employer-friendly changes in recent years.

Nebraska LB1023 (effective January 1, 2025)

Created a 7-day and $5,000 income threshold where previously there was no threshold at all. Modest relief, but an improvement over day-one withholding.

New York: Zelinsky ruling (May 2025)

The Tax Appeals Tribunal upheld the convenience of the employer rule, ruling that most remote work does not meet the employer necessity standard. The tribunal found that hiring remotely because that is where the candidate lives is not a qualifying business necessity. An earlier case (Myers, early 2025) reached the same conclusion for pandemic-era remote work. An appellate challenge to Zelinsky is expected, making this a live issue to track.

Kentucky HB 1 and Indiana rate reductions (2026)

Kentucky dropped its income tax rate to 3.5%. Indiana lowered its flat rate to 2.95% (heading to 2.9% in 2027). Both affect the withholding calculation for employees in those states.

Federal Mobile Workforce Act, S.1443 (reintroduced April 2025)

This bill would create a uniform 30-day threshold across all states, which would dramatically simplify multi-state withholding. It has been reintroduced in every Congress since 2011 and has never passed. Do not plan around it. But it is worth watching: if it ever passes, it would eliminate the patchwork of state thresholds overnight.

What about employees who split time between states?

If an employee works three days a week from your New York office and two days from home in Connecticut, you typically need to allocate their wages between both states based on the ratio of days worked in each. New York gets 60%, Connecticut gets 40%.

In practice this gets messy. New York’s convenience rule may source all five days to New York unless the remote days qualify as employer necessity. Connecticut’s reciprocal convenience rule may also apply. The employee ends up filing returns in both states and claiming credits.

For most startups with fully remote employees, this is less common. But if you have a hybrid setup, or employees who travel to your office periodically, you need a system for tracking work-location days. Many payroll platforms can allocate wages automatically if you feed them the data. The hard part is getting the data in the first place.

What are the most common withholding determination mistakes?

Withholding for the company’s state instead of the employee’s.

This is the single most common error. A company headquartered in New York hires a remote employee in North Carolina and withholds New York tax instead of North Carolina tax. The employee ends up with the wrong state on their W-2, a mess to sort out at tax time, and the company owes penalties to North Carolina.

Missing a relocation.

Remote employees move. If someone relocates from Colorado to Oregon and does not tell payroll, you could be withholding for the wrong state for months. Build a process that requires employees to notify you before changing their work state. Confirm addresses at least quarterly.

Ignoring local income taxes.

Ten states have local income taxes (AL, IN, IA, KY, MD, MI, MO, NY, OH, PA), and cities like New York City, Philadelphia, Detroit, and many Ohio municipalities impose their own wage taxes. These are easy to miss. If your employee is in a city or county with a local tax, you may need a separate local withholding account.

Not collecting exemption certificates for reciprocity.

Reciprocity only applies if the employee files the right form. Without it, you are legally required to withhold for the work state even if a reciprocity agreement exists. Make collecting these forms part of your onboarding process for any employee in a reciprocity-eligible state pair.

If you have been withholding incorrectly: do not ignore it. Most states have voluntary disclosure agreements (VDAs) that let employers come into compliance with reduced penalties. The longer you wait, the more interest and penalties accrue. Reach out to the state tax authority or have your payroll provider handle it. Our nexus guide covers remediation steps in more detail.

How Warp handles multi-state withholding automatically

Keeping track of which state gets the tax, whether reciprocity applies, whether a convenience rule changes the answer, and whether this year’s rules differ from last year’s is exactly the kind of complexity that should not live on a spreadsheet.

Warp is the only AI-native HR & Payroll platform built for ambitious companies. Instead of clicking through clunky dashboards or .gov websites for taxes, Warp’s AI agents open every state tax account, file every payroll form, and resolve every tax notice automatically.

Every company gets a dedicated Account Manager and Benefits Advisor included to guide them through payroll setup, multi-state expansion, and benefits selection. You do not have to spend hours on hold with tax agencies or worry about compliance mistakes.

With Warp, you will never visit a government website, negotiate with tax agencies, or pay accountants $150 per filing. Just focus on building your business while Warp handles payroll, compliance, and benefits for your team across any state or country.

Thousands of fast-growing startups trust Warp to stay compliant while they scale.

→ See how Warp works

FAQ: State income tax withholding for remote employees

Do remote employees pay taxes where they live or where the company is?

Where they live, in most cases. The physical location where the employee performs work drives withholding. If your employee lives and works in Colorado and your office is in California, you withhold Colorado tax. The main exception is the convenience of the employer rule in eight states, which can source income back to the employer’s state.

How do I avoid double taxation when my employee and company are in different states?

In most situations, the employee’s resident state provides a credit for taxes paid to the work state, preventing double taxation. Reciprocity agreements eliminate the issue entirely by only taxing in one state. The employer’s role is to withhold in the correct state and let the credit mechanism work at the employee level. If a convenience-of-the-employer state is involved, both states may require withholding, but credits should offset the overlap.

What happens if I withhold for the wrong state?

The correct state can assess the employer for the tax that should have been withheld, plus penalties and interest. Penalties commonly range from 5% to 25% of the unpaid amount, depending on the state. You will also need to correct the employee’s W-2, which may require filing amended returns in both the incorrect and correct states. It is much easier to get this right from the start.

Does hiring a 1099 contractor create the same withholding obligations as a W-2 employee?

No. Independent contractors handle their own tax payments, so you do not withhold state income tax for them. However, some states require backup withholding for contractors who do not provide a valid TIN, and having a contractor in a state may still create corporate tax nexus. The withholding rules in this guide apply specifically to W-2 employees.

Is there a federal law that simplifies multi-state withholding?

Not yet. The Mobile Workforce State Income Tax Simplification Act (S.1443) would create a uniform 30-day threshold across all states, but it has been reintroduced in every Congress since 2011 without passing. For now, employers must navigate each state’s individual rules. The best current protection is to track employee work locations carefully and use payroll software that handles multi-state calculations automatically.