Managing cross-border workers in the U.S. requires understanding two distinct legal areas: work authorization and tax compliance. Mixing these up can lead to fines, penalties, or worse. Here’s what you need to know:
- Work Authorization: Ensures individuals are legally allowed to work in the U.S. Employers must complete Form I-9 for every hire, verifying identity and work eligibility. This process is overseen by DHS and involves specific document requirements.
- Tax Compliance: Focuses on proper wage reporting, tax withholding, and filing forms like W-2, W-4, or 1042-S. The IRS manages this area, with rules differing for resident and nonresident aliens.
Key Differences:
- Work authorization confirms legal work status; tax compliance ensures accurate tax reporting.
- Agencies involved: DHS (work authorization) vs. IRS (tax compliance).
- Errors in either can result in fines, audits, or legal action.
Employers must handle both processes independently but in coordination, especially for industries like construction or energy, where mobile and cross-border workers are common. Tools that integrate compliance tracking can help avoid costly mistakes.
Work Authorization Requirements for Cross-Border Workers
Legal Basis and Employer Duties
In the U.S., work authorization rules are based on Section 274A of the Immigration and Nationality Act (INA). Employers are required to confirm a new hire’s identity and work eligibility by completing Form I-9 within three business days of the hire date. These records must be kept for either three years from the hire date or one year after the employee leaves, whichever comes later. For employers using electronic I-9 systems, the updated form version (expiring 05/31/2027) must be adopted by July 31, 2026.
Accepted Documents and Common Visa Types
Employers also need to navigate the documentation process and visa requirements. Form I-9 categorizes acceptable documents into three lists:
- List A: Covers both identity and work authorization (e.g., U.S. passport or Permanent Resident Card).
- Lists B and C: Require a combination of documents, such as a driver’s license (List B) and an unrestricted Social Security card (List C).
However, a Social Security card marked "VALID FOR WORK ONLY WITH DHS AUTHORIZATION" is not sufficient unless accompanied by a valid Employment Authorization Document (EAD).
For industries like construction and energy, specific visa categories often apply, with most requiring employer-specific authorization. Here’s a quick look at the most common types:
| Visa Category | Typical Use in Construction/Energy | Authorization Type |
|---|---|---|
| H-1B | Engineers, technical specialists | Specific employer only |
| TN (USMCA) | Canadian/Mexican professionals | Specific employer only |
| L-1 | Intracompany transferees | Specific employer only |
| H-2B | Temporary non-agricultural workers | Specific employer only |
| L-2S / E-1S / E-2S | Spouses of L-1 or E nonimmigrants | Any employer, incident to status |
For employer-specific visas, a foreign passport paired with a Form I-94 Arrival-Departure Record is the primary proof of work authorization. Since most I-94 records are now automated at entry points like airports, workers may need to retrieve a printable copy from the CBP website for verification purposes.
Challenges in Multi-Site and Cross-Border Operations
Managing work authorization across multiple sites can be tricky, especially for workers on H-1B, TN, or L-1 visas. These visas typically tie workers to a specific employer and role. Even a temporary relocation or role change can breach visa conditions, requiring new filings.
In cases where an extension is filed on time, nonimmigrant workers may continue working for the same employer for up to 240 days beyond their current authorized stay. Staying on top of these deadlines is essential to avoid lapses in compliance.
Remote verification adds another layer of complexity for employers with dispersed job sites. Companies enrolled in E-Verify can use a DHS-approved method to verify I-9 documents remotely, which is particularly helpful for industries like energy or construction that operate across remote or multi-state locations. Tools like ABLEMKR help streamline this process by integrating compliance tracking into workforce management, offering real-time updates on worker authorization. This ensures compliance stays intact even as job sites and roles shift, highlighting the close link between work authorization and tax compliance.
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Tax Compliance Obligations for Employers and Workers
Tax Residency and Employer Withholding Duties
Before starting any tax withholding, it’s crucial to determine how a worker is classified for tax purposes. The IRS differentiates between Resident Aliens (RAs) and Nonresident Aliens (NRAs), and the rules for these groups vary significantly.
Resident aliens, similar to U.S. citizens, are taxed on their worldwide income. On the other hand, nonresident aliens are taxed only on U.S.-source income and face additional documentation requirements. For instance, an NRA cannot claim "exempt" status on Form W-4. Instead, they must write "Nonresident Alien" or "NRA" below Step 4(c), as specified in IRS Notice 1392. Misclassifying a worker can result in costly withholding errors.
| Requirement | Resident Alien | Nonresident Alien |
|---|---|---|
| Taxable Income | Worldwide | U.S.-source only |
| Withholding Basis | Same as U.S. citizens | Based on NRA-specific rules in Notice 1392 |
| Primary Reporting Form | Form W-2 | Form 1042-S and/or W-2 |
| FICA Taxes | Generally applies | Applies unless exempt by visa or treaty |
When it comes to FICA taxes (Social Security and Medicare), the rules are based on where the work is performed. For 2026, both employers and employees contribute 6.2% for Social Security (up to a wage base of $184,500) and 1.45% for Medicare, which has no wage cap. These taxes apply to anyone providing services within the U.S., regardless of their citizenship or the employer’s location.
These distinctions are just the beginning of navigating the complexities of cross-border tax compliance.
Cross-Border Tax Challenges
Tax treaties and exemptions add another layer of complexity to cross-border compliance, especially for nonresident aliens.
Tax treaties can reduce or eliminate federal income tax withholding for eligible NRAs, but it’s not automatic. Workers must submit Form 8233 to their employer, who has five days to review, sign, and send it to the IRS. Many employers fail to follow this process correctly. Even when a treaty reduces federal income tax withholding, FICA obligations typically remain unless a Totalization Agreement applies.
"In most situations, wages exempt under an income tax treaty remain subject to the FICA rules." – Jeffrey N. Bilsky, CPA, Managing Principal, BDO USA
A Totalization Agreement is a separate arrangement between countries that can override FICA requirements, covering Social Security (OASDI) and Medicare (HI), but not Federal Unemployment Tax (FUTA).
Recent changes in treaty agreements also complicate compliance. The U.S. has terminated or suspended treaties with several countries. Hungary’s treaty ended on January 1, 2024, while partial suspensions took effect for Russia (August 16, 2024) and Belarus (December 17, 2024). For workers from these countries, employers must now apply the statutory 30% withholding rate on U.S.-source income.
Additionally, there’s a de minimis exception under IRC 861(a)(3). This rule exempts NRAs from federal income tax if they are in the U.S. for fewer than 90 days, earn less than $3,000 from a foreign employer, and meet specific criteria. However, FICA taxes may still apply.
Aligning Payroll and Location Data
Where a worker performs their job directly affects tax obligations. This is especially important in industries with mobile workforces. Integrating timekeeping, geo-location, and payroll systems in real-time helps prevent misclassification and reporting errors.
The Substantial Presence Test highlights the need for precise tracking. A foreign worker becomes a U.S. tax resident if they are in the U.S. for at least 31 days in the current year and 183 days over a weighted three-year period. Crossing this threshold unexpectedly can shift an employer’s withholding responsibilities entirely.
"Errors in residency determinations can lead to US taxation, penalties, or extensive reporting obligations." – Heather Fincher, JD, LLM (Tax), Associate, Kostelanetz LLP
Accurate day tracking and payroll alignment are essential for compliance. Even when federal exemptions apply, state and local tax reporting requirements remain in place. Tools like ABLEMKR’s platform integrate compliance tracking with real-time location data, ensuring that payroll and tax reporting stay accurate as workers move across jurisdictions.
Train the Trainer: Immigration Compliance for Businesses and Employers
Work Authorization vs. Tax Compliance: Key Differences
Work Authorization vs. Tax Compliance: Key Differences for Cross-Border Employers
Comparison Table
Work authorization and tax compliance operate under entirely different frameworks, each with its own purpose, governing bodies, and consequences.
| Feature | Work Authorization | Tax Compliance |
|---|---|---|
| Primary Objective | Confirm the legal right to live and work in the U.S. | Ensure proper tax withholding and payment |
| Legal Basis | Immigration and Nationality Act (Title 8) | Internal Revenue Code (Title 26) |
| Primary Regulators | DHS, USCIS, ICE | IRS, SSA, State Tax Authorities |
| Key Documents | Form I-9, EAD, Visa, I-94 | Form W-4, SSN, Form 941, W-2 |
| Responsible Party | Employer (to verify) and Employee (to provide) | Employer (to withhold/remit) and Employee (to report) |
| Enforcement Action | Fines, worksite raids, deportation | Audits, back taxes, criminal fraud charges |
This table highlights the distinct nature of these obligations, setting the stage for a deeper dive into the risks they pose in real-world situations.
Key Risks in Cross-Border Scenarios
The biggest challenge arises when these two systems fail to align, especially during changes in an employee’s immigration status. Tax obligations can shift immediately, but payroll systems often lag, creating compliance gaps.
Take, for example, an employee transitioning from F-1 to H-1B status. This change ends the FICA exemption instantly, but if payroll systems don’t adjust, the employer could face hefty penalties. In one case, a misstep like this resulted in over $150,000 in additional taxes.
"The moment an employee’s status changes to H-1B, they are no longer exempt [from FICA], irrespective of their U.S. tenure." – AccuPay Systems
Industries like construction and energy are particularly vulnerable. Workers frequently cross state lines, and payroll systems struggle to keep up. In April 2025, three Florida construction company owners admitted guilt in a scheme involving unauthorized workers and payroll tax fraud. The fallout? A $37 million payroll tax loss and $13 million in insurance losses. This case highlights how immigration and tax violations are increasingly prosecuted together.
Adding to the complexity, agencies are stepping up collaboration. A new Memorandum of Understanding (MOU) signed in April 2025 allows the IRS to share ITIN data with ICE for immigration enforcement.
"The MOU represents a major shift from decades-long IRS practice and norms, which historically have emphasized taxpayer confidentiality and privacy." – Crowell & Moring LLP
These developments emphasize the importance of having systems in place to manage compliance seamlessly.
How Integrated Tools Help
Combining work authorization and tax compliance processes into a unified workflow can help prevent costly errors.
ABLEMKR’s platform is designed specifically for industries like construction, energy, and extractives. By integrating worker certifications, visa details, geo-location data, and payroll information, it can proactively flag potential issues – such as an expiring EAD or a visa status change – before they lead to tax withholding problems. Real-time location tracking also ensures that state and local tax obligations match where the work is actually performed.
"Worker misclassification commonly costs businesses between $15,000 and $100,000 in IRS back taxes, DOL fines, state penalties, and legal fees, and one finding often triggers audits across multiple agencies." – Austin Heaton, Rise
For businesses with high turnover and operations across multiple sites, automated tools offer a critical layer of financial protection.
Conclusion: Connecting Work Authorization and Tax Compliance
Work authorization and tax compliance may seem like separate responsibilities, but they are closely tied together. If changes in visa status aren’t updated in payroll systems quickly, it can lead to noncompliance and attract regulatory scrutiny.
Today, compliance management has evolved beyond manual methods like spreadsheets and checklists. Continuous, system-driven monitoring has become the norm, especially in industries where even small errors can result in significant financial or legal repercussions.
This is particularly true for sectors like construction, oil & gas, and utilities, where mobile workforces and frequent job site changes are common. In such environments, even a small misclassification can lead to audits and hefty penalties.
To address these challenges, employers need a unified solution. Integrated platforms can centralize compliance tracking and send proactive alerts about potential risks to work authorization and tax withholding. ABLEMKR provides exactly this kind of solution – offering real-time risk alerts that adapt to dynamic work conditions by combining verified worker credentials, geo-location data, and payroll workflows into one streamlined system.
FAQs
Can a worker be tax-compliant but not authorized to work in the U.S.?
Yes, a worker can fulfill their tax obligations even without being authorized to work in the U.S. Federal tax laws separate an individual’s tax responsibilities from their immigration status. For tax purposes, individuals are classified as either resident aliens or nonresident aliens, based on specific criteria.
Unauthorized workers who meet the substantial presence test are treated as resident aliens for tax purposes. These individuals are required to file taxes, often using an Individual Taxpayer Identification Number (ITIN). It’s important to note that an ITIN is solely for tax reporting and does not provide work authorization or affect immigration status.
What events should trigger an immediate payroll update for a visa holder?
Payroll updates need to happen right away if a visa holder’s work authorization or tax residency status changes. This helps prevent compliance problems. Some key events that require immediate action include:
- Starting work in the U.S., which means they need to be added to U.S. payroll.
- Meeting the IRS Substantial Presence Test, which affects how taxes are withheld.
- Submitting tax treaty forms, such as Form 8233, which can change tax obligations.
- A change in visa status that impacts their eligibility for FICA exemptions.
If these updates are delayed, it could result in penalties or incorrect tax withholding, creating unnecessary complications.
How can I track my days in the U.S. to avoid surprises with the Substantial Presence Test?
To steer clear of unexpected outcomes with the Substantial Presence Test, make sure to keep a thorough record of every day you spend in the U.S., including partial days and travel dates. Hold onto important documents like passport stamps, airline itineraries, and your I-94 travel history. If you’re eligible for certain exclusions – such as exempt status or time spent in the U.S. due to medical conditions – don’t forget to file IRS Form 8843 to ensure those days are properly excluded.
