South Korea's Yellow Envelope Act: What the New Employer Definition Means for Companies Using EOR

South Korea has long maintained a rigorous labor framework, and Korean courts had, in some indirect-employment contexts, considered whether a principal exercised sufficient control over workers. The September 2025 amendments to the Trade Union and Labor Relations Adjustment Act (TULRAA), widely known as the Yellow Envelope Act, took that developing case law and expressly broadened the statutory employer definition. When the law came into force on March 10, 2026, any entity that exercises substantial and specific control over workers' conditions became potentially subject to collective bargaining obligations, even without a direct employment relationship.

For companies relying on outsourcing arrangements, staffing agencies, or Employer of Record providers to operate in Korea, the implications are significant and deserve careful assessment. This article explains what changed, who is affected, and how the structure of your Korean workforce arrangements determines whether the expanded definition applies to you.

What the Yellow Envelope Act actually changed

The Yellow Envelope Act amends Articles 2 and 3 of the TULRAA. Korea's National Assembly passed the legislation on August 24, 2025, with 183 votes in favor, and the law took effect on March 10, 2026. In December 2025, Korea's Ministry of Employment and Labor (MOEL) released draft Interpretive Guidelines to clarify how the key provisions apply in practice. The discussion below reflects those draft guidelines as available at the time of publication. Readers should verify whether final guidance has since been issued and check for updates directly with MOEL or qualified Korean counsel.

The Act makes three substantive changes:

• Expanded employer definition: The category of entities with collective bargaining obligations now includes those that substantially and specifically control working conditions, even without a direct employment contract. For convenience, this article refers to such entities as "non-contracting employers," subject to the terminology used in final MOEL guidance.

• Expanded scope of labor disputes: Certain management decisions that affect employment status or working conditions may now support a labor dispute or bargaining demand where previously they had been treated as management prerogative outside bargaining scope.

• Revised damage claim rules: The amendments restrict and individualize damage claims arising from industrial action and address liability connected to action taken in response to an employer's unlawful conduct. Korean counsel should be consulted for the precise thresholds.

The Act's name traces to a 2014 incident when supporters of laid-off workers who faced ruinous corporate damage claims for participating in an unauthorized strike donated money in yellow envelopes. The legislation addresses that disproportion directly.

The new employer definition: who qualifies as a non-contracting employer

The MOEL draft Interpretive Guidelines lay out the criteria for determining whether a company that did not sign the employment contract can nonetheless be treated as an "employer" for collective bargaining purposes. The assessment is fact-specific and focuses on whether the entity exercises "structural control" over working conditions.

MOEL identifies several control indicators:

• Structural control: Implementing contractual terms, detailed work manuals, or automated systems that systematically shape how work is performed across the entire contractor workforce

• Workforce management: Specifying headcount, qualifications, or skill requirements for particular processes or roles

• Working time: Setting production schedules or shift systems that dictate the subcontractor's rosters and overtime patterns

• Work methods: Mandating detailed standard operating procedures or centralized management systems that determine task sequences, allocation, and methods

• Wages: Controlling pay criteria through wage tables, allowance structures, or labor cost approval authority that limits the contracting employer's discretion

MOEL also considers whether the subcontractor is organizationally integrated into the principal's business and economically dependent on it. These factors can indicate substantial control beyond any single criterion, and no one factor is determinative on its own.

On the lower-risk end: where a client company specifies only deadlines, quantity, or quality of deliverables while leaving the operation and methods to the contractor's discretion, as in volume-based outsourcing, the likelihood of being found a non-contracting employer is considerably lower. Because companies fall along a spectrum, MOEL focuses primarily on their day-to-day operational involvement with subcontracted workers.

Which industries face the most exposure

The Yellow Envelope Act affects all sectors where principal companies rely on subcontracted or outsourced labor, but the risk is concentrated in industries where operational integration between client and contractor is deepest.

The Act also amended provisions related to union membership, allowing certain unions to include members outside the traditional employee definition. For companies operating in platform-dependent or gig-intensive business models in Korea, this broadens the population with the right to organize and bargain. The precise scope of these changes should be confirmed against the amended statutory text and current MOEL guidance.

What the expanded labor dispute scope means for operational decisions

Before March 10, 2026, legitimate labor disputes in Korea were confined to matters concerning the determination of working conditions, including pay, hours, and similar terms. The Yellow Envelope Act changes this materially.

Under the amended TULRAA, certain management decisions may fall within the amended dispute definition when they affect employment status or working conditions. Subject to case-specific analysis under the statute and applicable guidance, these can include:

• Layoffs: Workforce reductions may now support a labor dispute or bargaining demand when they materially affect employment status or working conditions.

• Workforce transfers: Job transfers that significantly change an employee's working conditions can trigger bargaining considerations under the amended framework.

• Restructuring and business closure: A decision to close or sell part of a business does not automatically become a bargainable subject, but if that closure leads to layoffs or workforce adjustments, those measures may fall within scope.

• M&A transactions: Employment measures associated with an M&A transaction may fall within the amended dispute definition when they affect employment status or working conditions. The transaction itself is not automatically a bargainable subject.

The implication for companies planning organizational changes in Korea is that decisions previously made unilaterally, such as announcing a restructuring, relocating a facility, or transferring staff, may now generate bargaining demands and, where all statutory requirements for protected industrial action are met, potential industrial action. Engaging labor counsel at the planning stage, before decisions are communicated, is now a standard precaution rather than an optional one.

What the Yellow Envelope Act means for companies using EOR

EOR and service outsourcing allocate responsibilities differently, but regulators will assess the substance of each arrangement. Neither label by itself determines the client's obligations under the amended TULRAA.

In an EOR arrangement, the EOR signs the employment agreement and serves as the worker's contractual employer. The EOR holds employer registrations with the relevant labor and insurance authorities, runs payroll in Korean Won, manages statutory benefits, and administers the employer responsibilities allocated to it under Korean law. The client company directs business outcomes and work assignments, while Deel is the contractual employer, though the client's conduct may still create separate obligations under control-based or other applicable legal tests.

The TULRAA's "substantial control" test looks at working conditions: schedules, rosters, pay criteria, procedural standards. When a client company works with an EOR and limits its role to assigning business tasks and outcomes, without setting working hours, controlling compensation structures, or mandating detailed procedural SOPs for how the EOR's employees perform their work rather than only defining what they deliver, those particular control indicators may be reduced. The arrangement must still be assessed holistically under the statute and applicable MOEL guidance.

Companies using EOR arrangements should review whether their day-to-day interactions with EOR-employed staff cross into the control territory the MOEL Guidelines identify. Relevant questions include:

• Does your company set or approve working hours and shift schedules for EOR-employed workers?

• Do your internal SOPs, quality standards, or automated systems govern how the EOR's employees perform their work, rather than only defining what they deliver?

• Does your company have veto authority over compensation adjustments or allowance changes for those workers?

Consistently limiting control over the relevant working conditions may reduce the likelihood of being treated as a non-contracting employer for those conditions, but it does not guarantee exclusion from the definition. Where the answers edge toward "yes" for any of these questions, the parties should obtain Korean legal advice and align contracts, management practices, and employment responsibilities with applicable law.

What the Yellow Envelope Act means for traditional outsourcing arrangements

Traditional outsourcing arrangements, in which a client company contracts a vendor or staffing agency but retains substantial operational involvement with the vendor's workers, face significantly higher Yellow Envelope Act exposure.

The MOEL Guidelines make clear that the control test focuses on substance over form. A company that dictates the specific working methods, approves the staffing composition, sets the shift calendar, or controls what individual workers are paid through wage tables or allowance criteria can be found to be a non-contracting employer regardless of how the service agreement characterizes the relationship.

Practical steps for companies with existing outsourcing arrangements in Korea:

• Audit all vendor and subcontracting agreements against MOEL's control criteria. In particular, look for provisions that set working hours, staff qualifications, individual-level approval rights, or detailed SOPs for how the vendor's employees must perform their work

• Assess whether the economic and organizational dependence of the vendor on your company meets MOEL's additional integration indicators, keeping in mind that single-client dependency is a relevant supporting factor, not a determinative one by itself

• Identify which arrangements fall on the higher-risk end and model what collective bargaining engagement would look like if a subcontractor union made a direct demand

• Develop a labor relations response protocol that covers the new expanded labor dispute subjects, including restructuring and workforce transfer decisions

• Engage Korean employment counsel before any significant organizational decision that could be characterized as affecting working conditions under the new framework

The ILO's comparative labor standards framework provides useful international context for assessing where Korea's new definition sits relative to other jurisdictions, particularly for global legal teams managing compliance across multiple markets.

Due diligence checklist: assessing your Yellow Envelope Act exposure

For global HR, legal, and procurement leaders reviewing Korean workforce arrangements, the following assessment covers the primary exposure areas:

• Map all Korean workforce arrangements by type: direct employment, EOR, staffing agency, subcontractor, outsourcing vendor

• For each arrangement, assess the degree of operational control: who sets working hours, SOPs, compensation criteria, and headcount requirements

• Review the economic dependency of each vendor or contractor on your company. Consider whether single-client dependence is a relevant supporting factor under current MOEL guidance

• Identify which subcontractors' workforces are unionized or have a history of labor disputes

• Confirm with Korean employment counsel whether any existing arrangements meet MOEL's non-contracting employer criteria

• Update internal protocols for management decisions that now fall within the expanded labor dispute scope (layoffs, restructuring, office closures, M&As)

• Train HR and procurement teams on the new bargaining-demand process, including the role of the Labor Relations Commission and potential consequences of non-engagement. Have Korean counsel verify the exact procedure, decision-maker, appeal path, and applicable sanction

• For IT outsourcing specifically, review managed-service and dedicated-team arrangements where client-side sprint management, productivity monitoring, and SOP mandates are common

How hiring with Deel in South Korea works

For companies seeking to hire in South Korea without a registered local entity, or those evaluating whether direct employment through Deel's EOR solution is an appropriate alternative to an existing outsourcing arrangement, Deel provides EOR services in South Korea through its local employing entity.

Deel manages employment contracts under the Labour Standards Act, handles payroll in Korean Won, registers and remits contributions across South Korea's Four Major Insurances (National Pension, National Health Insurance, Employment Insurance, and Industrial Accident Compensation Insurance), and administers applicable statutory retirement or severance benefits under South Korean law.

The client sets appropriate business objectives and work assignments within the agreed operating model, while Deel administers the contractual employer responsibilities assigned to it. Both parties must follow a clearly defined operating model and comply with obligations applicable to their respective conduct.

For companies already in South Korea through entity-based operations and direct headcount, Deel Payroll helps run payroll for employees of an owned South Korean entity, supporting payroll calculation and administration. For direct labor relations questions and compliance strategy under the Yellow Envelope Act, qualified Korean counsel should be engaged.