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FY 2025-26 · AY 2026-27
Updated September 2026

Comprehensive Guide to Unique Quantity Code (UQC) under GSTUnderstanding UQC for Accurate GST Compliance

Explore the essential aspects of Unique Quantity Codes (UQC) under the GST system, including their application, declaration requirements, and common taxpayer confusions.

Contents
1

What is UQC?


2

UQC under GST


3

Declaration of UQC


4

Common Confusions


5

List of UQC Codes


6

FAQs on UQC under GST

What is UQC?

  1. Definition and Importance

    Unique Quantity Code (UQC) is a standardized unit of measurement used in the GST system.

    • Ensures uniformity in reporting quantities across invoices.

    • Facilitates accurate tax calculations and compliance.

    • Used in various GST-related documents such as invoices and e-way bills.

  2. Examples of UQC

    Understanding UQC through practical examples.

    • 1 kilogram of rice is represented as 1 KGS.

    • 500 milliliters of oil is denoted as 500 MLT.

    • 10 meters of fabric is written as 10 MTR.

  3. Relevance in GST Compliance

    UQC plays a crucial role in ensuring GST compliance.

    • Mandatory for all GST-registered businesses.

    • Helps in maintaining consistency in tax filings.

    • Prevents errors in quantity reporting during GST returns.

  4. Worked Example

    Illustrating the use of UQC in a GST invoice.

    • A business sells 50 kilograms of wheat.

    • Invoice must state '50 KGS' as the quantity.

    • Ensures clarity and compliance with GST norms.

UQC under GST

  1. Regulatory Framework

    UQC is governed by specific GST rules.

    • As per CGST Rules, UQC must be included in invoices.

    • Applicable to credit and debit notes as well.

    • Ensures standardized reporting across GST filings.

  2. Application in GST Documents

    UQC is required in various GST-related documents.

    • Mandatory in e-invoices and e-way bills.

    • Included in the HSN summary of GSTR-1.

    • Ensures accurate tracking of goods movement.

  3. Impact on Tax Calculations

    UQC affects the accuracy of tax calculations.

    • Ensures correct quantity reporting for tax purposes.

    • Prevents discrepancies in GST returns.

    • Facilitates smooth GST audits and assessments.

  4. Worked Example

    Calculating GST with UQC.

    • A company sells 100 liters of milk.

    • GST rate is 5%, UQC is 100 LTR.

    • Tax payable: 100 LTR x ₹50 x 5% = ₹250.

Declaration of UQC

  1. Where to Declare UQC

    UQC must be declared in specific GST filings.

    • Included in GSTR-1 under the HSN summary.

    • Required in e-invoices for B2B transactions.

    • Mentioned in e-way bills for goods movement.

  2. Steps for Declaration

    How to correctly declare UQC in GST filings.

    • Select the correct UQC from the GST portal dropdown.

    • Ensure consistency with the unit of measurement.

    • Verify UQC before submitting GST returns.

  3. Common Mistakes to Avoid

    Avoid these errors when declaring UQC.

    • Using incorrect or non-standard UQC codes.

    • Mismatching UQC with the actual quantity.

    • Neglecting to update UQC in amended returns.

  4. Worked Example

    Correctly declaring UQC in a GST return.

    • A trader sells 200 bottles of juice.

    • UQC is '200 BTL', declared in GSTR-1.

    • Ensures accurate tax reporting and compliance.

Common Confusions

  1. Variations in UQC Codes

    Understanding common confusions related to UQC.

    • Different representations for the same unit.

    • GST portal accepts only standardized codes.

    • Example: 'MTR' for meters, not 'm' or 'metre'.

  2. Resolving UQC Errors

    Steps to resolve UQC-related errors in GST filings.

    • Verify UQC codes before submission.

    • Use the GST portal's dropdown for selection.

    • Correct errors promptly to avoid penalties.

  3. Impact of Incorrect UQC

    Consequences of using incorrect UQC codes.

    • Leads to GST return rejections.

    • May result in penalties or fines.

    • Affects the accuracy of tax calculations.

  4. Worked Example

    Correcting a UQC error in a GST return.

    • A business mistakenly uses 'm' instead of 'MTR'.

    • GST return is rejected due to incorrect UQC.

    • Corrected to 'MTR' and resubmitted successfully.

List of UQC Codes

  1. Standard UQC Codes

    A list of standardized UQC codes used in GST.

    • BAG - Bags

    • BAL - Bale

    • BDL - Bundles

  2. Volume Measurement Codes

    UQC codes for volume measurements.

    • CBM - Cubic Meter

    • CCM - Cubic Centimeter

    • MLT - Milliliter

  3. Weight Measurement Codes

    UQC codes for weight measurements.

    • KGS - Kilograms

    • GMS - Grams

    • TON - Tonnes

  4. Length Measurement Codes

    UQC codes for length measurements.

    • MTR - Meters

    • CMS - Centimeter

    • YDS - Yards

  5. Miscellaneous Codes

    Other UQC codes used in GST.

    • PCS - Pieces

    • SET - Sets

    • OTH - Others

FAQs on UQC under GST

What is the purpose of UQC in GST?

UQC ensures standardized reporting of quantities in GST filings, facilitating accurate tax calculations and compliance.


Where should UQC be mentioned in GST returns?

UQC must be declared in the HSN summary of GSTR-1, e-invoices, and e-way bills to ensure accurate reporting.


What happens if the wrong UQC is used?

Using incorrect UQC can lead to GST return rejections, penalties, and inaccuracies in tax calculations.


How can I select the correct UQC?

Use the GST portal's dropdown menu to select the correct UQC, ensuring it matches the unit of measurement used.


Are there any penalties for incorrect UQC declaration?

Yes, incorrect UQC declaration can result in penalties, fines, and the need to amend GST returns.


Can UQC codes be customized?

No, UQC codes are standardized and must be used as per GST guidelines to ensure compliance.


Is UQC mandatory for all GST-registered businesses?

Yes, all GST-registered businesses must use UQC for accurate reporting and compliance with GST regulations.


What is the UQC for measuring liquid volumes?

For liquid volumes, common UQC codes include MLT for milliliters and LTR for liters.


How does UQC affect GST audits?

Accurate UQC usage ensures smooth GST audits by providing clear and consistent quantity reporting.


What should I do if my product's UQC is not listed?

If your product's UQC is not listed, use the 'OTH - Others' code and ensure accurate description in your filings.

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