GST Reimbursement on Pre-GST Contracts: Employer Liability 2025-26

What Happened?

The Karnataka High Court recently delivered a significant ruling in August 2026 clarifying that incremental GST reimbursement obligations arising from pre-GST works contracts rest solely with the employer, not with the State or tax authorities. This judgment resolves a longstanding ambiguity in how businesses should treat GST liability when contracts signed before GST implementation (i.e., before 1 July 2017) later incur GST obligations due to contract extensions, renewal, or interpretation issues.

The court held that GST compliance timelines and filing deadlines remain binding on all parties, and businesses cannot defer or delay GST payments based on disputes over who bears the financial burden of such reimbursements.

Background & Legal Context

To understand this ruling, we need to examine the legal framework governing GST on works contracts:

What Are Pre-GST Works Contracts?

Pre-GST works contracts are agreements entered into before 1 July 2017 for construction, repairs, maintenance, or similar services. Under the pre-GST regime (Service Tax era), works contracts attracted 4.5% Service Tax with certain exemptions. When GST was rolled out on 1 July 2017, the GST rate on works contracts was set at 5% (for most categories).

What Is Incremental GST Reimbursement?

When a pre-GST works contract is executed or extended post-GST implementation, or when the contract parties later realize GST is applicable (perhaps due to contract amendment or clarification), the difference between the old Service Tax rate and new GST rate is termed 'incremental GST'. For example, if a contract was priced assuming 4.5% Service Tax but now attracts 5% GST, the 0.5% difference plus lost Input Tax Credit (ITC) benefits creates an additional burden.

Relevant Legal Sections

• CGST Act 2017, Section 15: Determines the place of supply for works contracts (generally at the location of work performed).
• CGST Act 2017, Section 13: Defines 'works contract' and its applicability.
• GST Council Notification (now codified in CGST Act 2025 equivalent): Transition provisions for pre-GST contracts were addressed in various council decisions and GST law amendments.
• Income Tax Act 2025, Section 37: Governs deductibility of GST liabilities as business expenses (if the employer bears the burden).
• Income Tax Act 2025, Section 43: Defines the cost of materials and services in calculating business income.

The Dispute: Who Bears the Burden?

Two positions existed before this judgment:

• Employer's position: "We signed a contract pre-GST. GST was not our burden then. The contractor should adjust their rates or the State should reimburse the difference."
• Tax Authority's position: "GST law is clear. Once GST applies, the employer must discharge GST even on old contracts. There is no 'reimbursement' mechanism from the State."

The Karnataka HC decisively ruled in favour of the tax authority's position: the employer's liability for GST on works contracts cannot be avoided or shifted to the State simply because the contract predates GST implementation.

What Does This Mean for You?

For Employers & Principal Contractors

If your business has pre-GST works contracts (signed before 1 July 2017) that are still ongoing or have been extended, the Karnataka HC ruling means:

• You cannot claim reimbursement from the State: There is no government mechanism to refund the incremental GST burden. You must absorb it as a business cost.
• You cannot delay GST payment: GST timelines are non-negotiable. Even if you dispute who should ultimately bear the cost, you must pay GST on due dates as per GST law.
• You can claim ITC (if eligible): If GST is paid on such contracts, you may be eligible to claim Input Tax Credit under CGST Act 2017, Section 16, provided the supplies are used for taxable supplies and proper documentation exists.
• Deductibility under IT Act 2025: The GST paid on incremental reimbursements is a legitimate business expense and deductible under Section 37 of IT Act 2025 (formerly Section 37 of IT Act 1961) in computing taxable income for AY 2026-27 and onwards.

For Contractors & Service Providers

If you are a contractor who signed pre-GST works contracts, this ruling clarifies that:

• The employer is your GST debtor: You can legitimately demand that the employer reimburse or absorb GST on supplies made under such contracts.
• You must charge GST: Once GST is applicable, you are obligated to charge and remit GST, even on old contracts. Failing to do so invites GST violation penalties.
• Negotiate revised terms: If a pre-GST contract did not account for GST, you should formally amend the contract or seek a rate revision to reflect GST liability.

For Assessment Year 2026-27 & Beyond

If you are filing your income tax return for AY 2026-27 (covering FY 2025-26), ensure that:

• All GST liabilities on works contracts (pre-GST or otherwise) are reflected as business expenses.
• ITC claimed matches your GST returns filed under GST law.
• No inconsistency exists between IT Act and GST return filings regarding the same contract.

What Should You Do Now?

Action Items for Employers

1. Audit your contracts: List all works contracts signed before 1 July 2017 that are still active or recently completed. Flag those where GST may have been incorrectly accounted for or omitted.
2. Quantify GST liability: Calculate the incremental GST (difference between Service Tax and GST, plus lost ITC). Determine in which financial years this liability arose.
3. Ensure GST compliance: If GST was not paid in prior years, consider filing amended GST returns (GSTR-1/GSTR-3B) if the time limit permits, or disclose to your GST Compliance Officer to avoid penalties.
4. Amend IT returns if needed: If you claimed deductions without including GST in prior years, review whether amended income tax returns (under IT Act 2025, Section 139) should be filed for affected assessment years.
5. Update contract clauses: For any future contracts or renewals, explicitly include GST clauses to avoid disputes.
6. Seek contractor agreement: For ongoing contracts, formally agree with contractors on how incremental GST will be borne (e.g., contractor absorbs it, or employer pays it separately).

Action Items for Contractors

1. Review payment terms: For pre-GST contracts still active, formally notify the employer (in writing) that GST applies and demand reimbursement or rate revision.
2. File GST returns accurately: Always charge and file GST even on legacy contracts. Non-compliance invites penalties under GST law.
3. Document the reimbursement: Ensure any GST reimbursement from the employer is clearly documented as a separate invoice or supplementary billing to create a proper audit trail.

Key Takeaways

• Employer bears incremental GST risk: Pre-GST contracts do not shield employers from GST liability. Once GST applies, employers must pay GST on works contracts; there is no State reimbursement.
• GST timelines are non-negotiable: Disputes over liability allocation do not excuse late GST filing or payment. Employers must file GST returns and remit tax on schedule.
• ITC is available: GST paid on works contracts may qualify for Input Tax Credit if the contract relates to taxable supplies, providing partial relief to employers.
• IT deductibility applies: Under IT Act 2025 Section 37, GST and incremental costs on works contracts are deductible business expenses, reducing taxable income for AY 2026-27 onwards.
• Immediate action required: Businesses with pre-GST works contracts must audit, quantify liability, amend GST/IT returns if eligible, and update contract clauses to avoid future disputes.

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