One Unit One ID: LIN Mandate for Multiple Factories 2026

Statutory Genesis & Current Legal Posture

The question of whether a company with multiple factory licenses requires separate Labour Identification Numbers (LINs) for each location, or whether a single LIN suffices under the ‘One Unit One ID’ rule, has become a critical compliance issue for India Inc. The answer is nuanced and depends on the legal identity of the establishment in question.

The central government has fully operationalized the Occupational Safety, Health and Working Conditions (OSH) Code, 2020, through the notification of the OSH (Central) Rules, 2026, via Gazette Notification G.S.R. 345(E) on May 8, 2026 . This notification marked the commencement of the final operational framework for the OSH Code and simultaneously triggered mandatory registration for all establishments . The Labour Identification Number now acts as the single thread that integrates EPFO, ESIC, and all other central labour law compliances . The Shram Suvidha Portal has been upgraded to handle the combined requirements of the new Labour Codes and serves as the single point of contact for employers to obtain a LIN and file the Unified Annual Return .

The legal basis of the LIN is rooted in the government’s objective to eliminate multiple employer codes being issued by separate labour enforcement agencies, replacing them with a single unique identifier . This was a central objective of the new Labour Codes, intended to reduce duplication and simplify reporting . The LIN, a 10-digit identification number issued by the Ministry of Labour and Employment, is assigned to each “inspectable unit” under any labour law. The system has been issuing LINs since at least 2016, with the number of issued LINs reaching 18 lakh at that time . The Shram Suvidha Portal provides for “Know Your LIN,” “LIN Verification,” and “Modification” services to manage data associated with the unique identifier .

The key to answering the multi-location question lies in the definition of an “establishment.” The OSH Code, 2020, through its Section 5, mandates the registration of every establishment . The Social Security Code, 2020, through Section 29, ties contribution obligations to this registration . If a company has multiple factories, each with its own distinct factory license, the primary question is whether these are considered separate “establishments” or branches of a single “establishment” under the labour codes.

According to the current understanding, the application process on the Shram Suvidha Portal allows you to indicate if your establishment is “related to another establishment which already has a LIN,” suggesting a capability to link related units . However, the portal also requires the entry of the number of workers, the establishment’s NIC Code, and the selection of applicable acts such as EPF and ESI . If a factory is a distinct legal entity with its own PAN and GSTIN, it is highly likely to be treated as a separate establishment and would require its own LIN. The system was explicitly designed such that “a unit registered with different labour enforcement agencies is identified uniquely and allotted a single unique LIN” .

Crucially, while the “One Unit One ID” rule points toward a single identifier per unit, it does not mean a single LIN for the entire corporate group. The LIN is tied to the physical or legal “unit” that is inspectable. A company with two distinct factories, each with its own license and potentially its own PAN, would be considered two separate units and would require two separate LINs, though they can be linked in the system to reflect the parent-child relationship . The recent OSH Rules mandate that every employee’s appointment letter must contain the employer’s LIN, further underscoring that the LIN is specific to the employing establishment .

Legacy Framework vs. Active/Transition Code Comparison

Parameter	Legacy Framework (Pre-Codes)	New Unified Framework (As per OSH & Social Security Codes)	Practical Operational Impact
Primary Identifier	Multiple codes issued by different agencies: EPFO code, ESIC code, CLRA license number, Factory license number, etc.	Single Labour Identification Number (LIN) for a unit, intended to subsume all other codes	Reduction in administrative burden of managing multiple identifiers; however, the LIN must be secured and verified on priority.
Registration & Licensing	Separate registrations under the Factories Act, Contract Labour Act, EPF, ESIC, and state-specific laws. Multiple renewals of licenses.	A single common registration for central labour laws via the Shram Suvidha Portal. Licenses can be granted for up to 5 years .	Shift from fragmented filings to a centralized digital process. The “PAN-India Single License” under the OSH Code streamlines multi-state contractor compliance .
Jurisdiction & Applicability	Central/State jurisdiction based on the specific Act. For instance, EPFO/ESIC had specific regional offices.	Multi-state establishments (units in more than one State/UT) fall under Central Government rules. Single-state establishments are governed by the relevant State Government’s rules (where notified) .	Multi-state employers are now clearly under the Central Government’s purview for social security registration, with a single authority for compliance . However, for OSH matters, the State Government remains the appropriate authority for factories .
Validity of Licenses	Licenses often required annual renewal and were valid for one year.	Licenses are valid for five years and may be deemed approved if the authority does not respond within the prescribed time (commonly 30 days) .	Reduced frequency of renewals, freeing up compliance resources.
Annual Returns	Separate annual returns to be filed under each Act.	A simplified, self-certified, single online annual return can be filed for all central laws under one LIN .	Significant reduction in the volume and complexity of annual filings, leading to improved compliance rates.

Operational Implementation Framework for HR & Legal Teams

Phase 1: Immediate LIN Identification and Verification

Determine whether each of your factory locations is a distinct legal unit or a branch of a single “establishment.” This is a critical legal determination.
Use the “Know Your LIN” feature on the Shram Suvidha Portal to check if a LIN has already been assigned to each of your units, as many existing units may have been auto-allotted one. Search can be done using PAN, EPFO code, or ESIC code .
For each unit that already has a LIN, verify the information associated with it immediately. Any corrections must be requested for modification through the portal, which will be verified and approved by the Regional Head of the appropriate Labour Enforcement Agency .
Deadline: Existing establishments must update their registration details on the Shram Suvidha Portal within six months of the Central Rules commencement date (May 8, 2026) . This is a mandatory update to link existing EPF/ESI compliances to the LIN.

Phase 2: New LIN Registration for Unassigned Units

For any unit that does not have a LIN, a new application must be submitted on the portal in Form-I within 60 days of being established.
Gather all required documents: PAN of the establishment/proprietor, establishment registration certificate (Factories Act or Shops & Establishments Act), address proof, details of employees, and existing registration numbers under various labour laws .
While filling the application, if your establishment is related to another establishment that already has a LIN, you can enter that LIN to establish a relationship in the system. This is how you would indicate your parent-child unit structure .
Note: The OTP verification process during registration is critical. Keep the registered mobile and email of the authorized signatory ready.

Phase 3: Integration and Ongoing Compliance

Once the LIN is secured for each unit, it becomes the master key for all other labour law compliances on the Shram Suvidha Portal .
The single online annual return can be filed for each LIN, but you must ensure that the returns are linked to the correct unit’s LIN. If you have multiple LINs, you will be filing separate returns, but through a single interface .
For the Pan-India Single License under the OSH Code, note that the license is for a contractor operating in more than one state and employing 50 or more workers . This license is tied to a single LIN, which acts as the core identifier for that contractor entity . This does not automatically exempt you from obtaining separate factory licenses for each location, as factory licensing remains a state subject.
Wage Ceilings: Remember the wage ceilings (EPF ₹15,000 threshold, ESI ₹21,000 threshold) are still applicable per employee per establishment. These thresholds are not linked to the LIN itself but are operational parameters that must be applied on a unit-by-unit basis.

Penal Consequences, Inspection Triggers, and Corporate Liability

Failure to obtain a LIN is not merely a procedural lapse; it is a foundational compliance failure that can derail your entire statutory framework. The ability to file returns, register for EPF and ESIC, and legally operate is dependent on having a valid LIN.

Statutory Penalties: The OSH Code has rationalized penalties, with minor offences being compoundable and serious safety breaches attracting severe penalties including imprisonment . Contravention leading to death of a worker can attract imprisonment of up to two years or a fine of at least ₹5 lakhs . Directors, occupiers, and managers of the company can be held directly liable under Chapter XIII of the OSH Code, especially if they are found to have connived in or were negligent about the non-compliance.
Inspection Triggers: The Shram Suvidha Portal has a computerized, risk-based inspection system. The portal provides for transparent inspections where reports must be uploaded online within a fixed timeframe. Having a dormant or incorrect LIN status on the portal can be an immediate red flag and trigger an inspection.
Corporate Liability: The Principal Employer’s liability is significantly increased under the new regime. From Day 1, if a contractor lacks a valid license (which is tied to a LIN), the Principal Employer is liable for wages and social security contributions. This creates a potent corporate liability, mandating rigorous due diligence on all contractors, including verifying their LINs.

Strategic Advisory & Edge Cases

Multi-Locational Compliance Friction: The fundamental friction point for multi-location companies is the divergence between central law and state law. While the Social Security Code centralises authority for multi-state establishments, for OSH matters, the State Government remains the appropriate Government for factories . Companies with operations in states like Gujarat, Karnataka, Maharashtra, and Tamil Nadu must monitor state-specific notifications. As of July 2026, Gujarat has notified final rules under all four Codes, while Maharashtra has only published draft rules . Your Gujarat branch must follow Gujarat state rules, while your Maharashtra branches operate under the substantive provisions of the Codes pending state rules . This creates a compliance nightmare for multi-state employers.

Contractor Workforce Intersection: For contractors, the Pan-India Single License under the OSH Code is a significant development. However, the threshold for this license is 50 or more workers, raised from the earlier 20. A contractor with less than 50 workers in a multi-state operation would not be eligible for this single license and would still need to navigate state-level licensing, while still requiring a LIN.

Linking Legacy Registrations: The process of “linking” your existing EPFO and ESIC codes to the LIN is a step where many companies face portal glitches, such as data mismatch or a “dormant status” on the portal. Proactive verification and reconciliation of data with the respective agencies before the linking process can mitigate these issues. The “LIN Verification” service on the portal is designed to address this, but timely action is the key to success .

In summary, each licensed factory or establishment must obtain and maintain its own Labour Identification Number. Corporate consolidation or a parent-child relationship in the system does not exempt an entity from its own unit-level registration obligations under the OSH Code, 2020.

Disclaimer: This blog constitutes statutory commentary and operational analysis based on notifications, rules, and judicial precedents published up to the current date in 2026. The information provided is for general informational purposes only and does not constitute formal legal advice or create a lawyer-client relationship. Labour laws are subject to frequent amendments and differing interpretations across various High Courts and States. You are strongly advised to consult a qualified legal professional to obtain advice specific to your company’s factual circumstances and jurisdictional requirements before implementing any of the compliance strategies discussed herein. The authors and publishers assume no liability for any actions taken or not taken based on the contents of this publication.