A founder I worked with in Singapore ran payroll for three US-based remote employees through her Pte Ltd’s US subsidiary. All three worked from home offices in different states. The subsidiary had been withholding state income tax for Delaware, where the parent company’s attorney had incorporated the entity. None of the three employees lived or worked in Delaware. Remote work state taxes, it turned out, had been accruing to the wrong states since the employees’ first day. By the time the error surfaced, eighteen months of payroll had been processed incorrectly. The fix: amended filings, interest charges, and two months of the finance team’s time.
Remote work state taxes are not a new concept, but the scale of the problem has grown with distributed hiring. The IRS confirmed in 2026 guidance that employers must withhold state income tax based on where employees physically perform their work, not where the company is headquartered. For employers managing remote teams across state lines, each new work location is a separate compliance obligation: its own registration, withholding, unemployment insurance rate, and audit exposure. The calculation is per-employee, not per-company.
Understanding remote work state taxes and employer nexus
The rule for state withholding is simple to state and surprisingly easy to violate: withhold in the state where the work happens.
An employee in Colorado working remotely for a company headquartered in Florida creates Colorado income tax withholding obligations for the employer, even if that employer has no office, assets, or other employees in Colorado. The state where the work is physically performed is the taxing state, not the state of incorporation, the state on the employment contract header, or the state where the company’s bank account sits.
Physical presence of an employee performing substantive work in a state creates nexus for payroll tax purposes. Nexus triggers registration with that state’s revenue department, withholding and remittance obligations, unemployment insurance contributions under that state’s rates, and in some cities (New York City being the prominent example) local-level payroll taxes on top. These requirements take effect from the employee’s first day of work, not from the day the employer eventually registers.
Misclassifying remote employees as independent contractors does not eliminate the withholding obligation. It defers discovery.
A state revenue department can assess back-withholding, interest, and penalties against the employer once employment status is established, dating from the commencement of work. The classification decision between contractor and employee is one that should be made before the hire, not revised after an audit notice arrives.
One doctrine that catches employers particularly off guard is the “convenience of the employer” rule. New York, Pennsylvania, Arkansas, Nebraska, Connecticut, and Delaware maintain versions of this rule, which treats income earned while working remotely as subject to withholding by the original employer-location state if the remote arrangement was made for the employee’s personal convenience rather than a business necessity. A New York-based employer whose employee moves to Vermont but remains in the same role continues to owe New York withholding on that employee’s income under this doctrine.
OECD 50% threshold & permanent establishment risk
The domestic US state tax question and the international Permanent Establishment (PE) question are distinct but structurally related: both turn on where the employee’s work physically occurs.
The Organisation for Economic Co-operation and Development (OECD) published its 2025 update to the Model Tax Convention in November 2025, introducing a specific framework for home-office PE risk in cross-border remote work. The update provides the first internationally recognized temporal benchmark for when a home office in another country does, and does not, constitute a fixed place of business for treaty purposes.
The OECD 50% threshold: an indicative benchmark
Under the 2025 update, an employee’s home office or other remote location does not create a fixed-place-of-business PE for the employer if the employee works from that location for less than 50% of total working time over any rolling 12-month period. This 50% figure is an indicative benchmark, not a formal safe harbor: employers whose cross-border remote workers stay below it have a defensible position that no PE has been created, though the outcome still depends on the overall facts and circumstances.
The rolling 12-month calculation matters more than it looks. The threshold is not measured across a calendar year or a fiscal year; it is assessed across any 12-month window beginning or ending within the relevant period. An employee who falls below 50% on a January-to-December basis may exceed it on a July-to-June measure. A static annual check is not sufficient.
Commercial reason test: when remote work exceeds 50%
Exceeding the 50% threshold does not automatically create a PE. The OECD framework requires a second, qualitative analysis: the commercial reason test. The employee’s presence in the remote country must serve a genuine commercial purpose for the employer’s business. Regular customer interactions, supplier engagement, and market-facing activity satisfy the test. Personal lifestyle preferences, talent retention, and employer cost savings do not.
An engineer who works from Lisbon for eight months because of quality-of-life preferences, with no Portuguese customers or suppliers involved, does not create a PE for a Singapore or Hong Kong employer, even though the 50% threshold is exceeded. The same engineer spending those eight months building a Portuguese client base and signing local contracts presents a different analysis entirely.
A PE finding has concrete consequences: corporate income tax in the host country attaches to profits attributable to the PE’s activities. Employers registered in Singapore, Hong Kong, and the UAE with employees working remotely abroad face this exposure symmetrically. The OECD framework applies to any employer in a treaty jurisdiction, and the PE exposure from remote hiring scales with both the seniority of the employee and the commercial nature of their local activities.
State income tax withholding & remote work compliance
Remote work state taxes create a grid of obligations that most payroll systems are not configured to handle automatically. The employer is responsible for identifying each state where an employee works, registering, and withholding correctly from the first paycheck.
| Employee work location | Withholding obligation | Apportionment method | Audit exposure level |
|---|---|---|---|
| Home state matching employer HQ | Single-state withholding | Full income to one state | Low |
| Different state from employer HQ | Employee’s work state | Full income to work state | Medium (registration gaps) |
| Multiple states (split work schedule) | Each state where work occurs | Days worked or wage allocation per state | High (apportionment errors) |
| International (outside US) | OECD PE and treaty analysis required | Profit attribution to PE if triggered | High (corporate tax exposure) |
Employees who split their working week across multiple states require apportionment. The apportionment method varies by state: some use days worked in the state as a fraction of total workdays, others use a wage-to-total-compensation ratio. For an employee working three days from Texas and two from California each week, both states have a claim on withholding in proportion to their share of working time.
Documentation supports every withholding decision. Time-entry records, work logs, manager attestations, and calendar data are all acceptable. The absence of records is the primary vulnerability in a state audit: a revenue department that cannot determine where an employee worked will estimate, using the most favorable-to-revenue assumption available.
The broader compliance picture for international remote teams also involves equity treatment, social security treaty elections, and benefit portability. Employers building compensation structures for distributed international teams need to address state and treaty-level obligations in the same design pass, because they interact.
Governance & internal controls for remote work tax compliance
Sound governance for remote work state taxes begins before the hire, not after the first paycheck. Three controls form the minimum viable framework.
The first is a pre-approval workflow. Any request to work from a location outside the employee’s contracted jurisdiction, whether a different US state or a different country, requires sign-off from HR, finance, and tax before the arrangement starts. The workflow documents the location, expected work-time allocation, and job function, and flags any arrangement approaching or exceeding the OECD 50% threshold for PE review before approval.
The second is a rolling 12-month location tracker. For US state compliance, the tracker captures days worked in each state per employee and confirms that withholding registrations are active for each state appearing in the data. For international arrangements, it monitors cumulative remote work time in each country against the 50% threshold and triggers a commercial reason analysis before the limit is reached.
The third control is a quarterly audit of all active remote work arrangements that classifies each arrangement as commercial (customer-facing, revenue-material) or auxiliary. The commercial-versus-auxiliary classification is the analytical hinge for PE avoidance above 50%; documented quarterly findings create a defensible record for any future disclosure or inquiry.
Employers using an Employer of Record (EOR) for foreign hires should verify that the EOR’s compliance scope covers PE analysis, not only payroll processing. Most EOR contracts address employment law but are silent on the employing company’s corporate tax PE exposure. The structural choice between an EOR and a local entity determines which party manages that risk and whether PE exposure is actually addressed or merely transferred by contract language.
FAQ
When does a remote employee working from another country create a permanent establishment and corporate tax obligation for the employer under the OECD 2025 framework?
A PE exists under the OECD 2025 framework only if both conditions of the two-part test are met: the employee works from the remote country for 50% or more of total working time over a rolling 12-month period, and the employee’s activities in that country serve a genuine commercial purpose for the employer’s business (regular local customer contact, supplier engagement, or market-facing work). Personal lifestyle preference, talent retention, and cost savings do not satisfy the commercial reason test regardless of how much time the employee spends there. If a PE is found, the employer faces corporate income tax in that country on profits attributable to the PE’s activities. The analysis applies to employers in any treaty jurisdiction, including Singapore, Hong Kong, and the UAE.
How should employers track remote work locations and days worked to comply with the OECD 50% threshold and state withholding requirements?
A rolling 12-month tracker updated monthly is the standard. For US state compliance, track days worked in each state per employee and confirm withholding registrations are active. For international arrangements, track working days in each country and flag any employee approaching the 50% threshold for a commercial reason review before the limit is breached. Supporting documentation should include time entries, manager attestations, and written remote work agreements.
What internal approvals and documentation procedures should companies implement to manage PE risk and state tax exposure from remote work policies?
Require written pre-approval for any remote work arrangement outside the employee’s contracted location, with sign-off from HR, finance, and tax. Document the requested jurisdiction, expected work-time allocation, job function, and whether the role involves local customer contact or revenue-generating activity. Conduct quarterly classification reviews separating commercial from auxiliary activity. Any arrangement at or approaching the OECD 50% threshold should reach tax counsel for review before continuation is authorized.
Sources
- IRS: Employment taxes for businesses
- OECD: Model Tax Convention on Income and on Capital (treaties page)
- TIGTA: Telework decreased after the return to in-person work (2026 report)
- IRS: Topic no. 753, Form W-4 and employer withholding
- OECD: OECD 2025 update to the Model Tax Convention, key highlights (taxnews.ey.com summary via EY Tax Alert)
