E-way bill validity calculation for over dimensional cargo under Rule 138

A heavy hydraulic trailer carrying a 45-tonne indivisible industrial boiler leaves an engineering works in Hazira, Gujarat, bound for a refinery in Barmer, Rajasthan. The trailer travels on multiple axles at an average speed of barely fifteen kilometres per hour. It navigates bypass roads, overhead high-tension power cables, and railway level crossings under police escort. If dispatch logs this shipment as standard cargo, the portal grants five days of validity for a 900 km route, and the document expires while the vehicle is halfway across Gujarat.

Moving special cargo on highway corridors demands exact adherence to statutory transport rules. Highway patrol squads inspect heavy machinery carriers routinely at state border checkposts. Selecting the wrong vehicle category or miscalculating the expiry date exposes the consignment to immediate physical detention and hefty financial penalties under GST law.

Statutory baseline: normal cargo versus over dimensional cargo

The statutory validity schedule in Rule 138(10) of the CGST Rules establishes two distinct benchmarks based on total transit distance within India:

While standard road transport operates under a 200 km daily run rate, Parliament and the GST Council recognized that super-heavy, indivisible consignments cannot maintain ordinary highway cruising speeds. As prescribed under Notification No. 12/2018-Central Tax, ODC consignments receive one full day for every 20 km or fraction of 20 km.

Legal definition of Over Dimensional Cargo under Rule 138(10)

Taxpayers cannot designate any consignment as ODC merely because the package is heavy or cumbersome. Explanation 2 to Rule 138(10) lays down two mandatory statutory conditions that must both exist simultaneously:

“For the purposes of this rule, the expression ‘Over Dimensional Cargo’ shall mean a cargo carried as a single indivisible unit and which exceeds the dimensional limits prescribed in rule 93 of the Central Motor Vehicle Rules, 1989, made under the Motor Vehicles Act, 1988 (59 of 1988).” Explanation 2 to Rule 138(10), CGST Rules

To qualify as legal ODC, the movement must satisfy two distinct criteria:

• Single indivisible unit: The cargo must be a single entity that cannot be dismantled into smaller components without risk of damage or destruction, such as a factory autoclave, wind turbine blade, power transformer, or reactor vessel. Loading multiple separate steel coils or palletised goods on an open flatbed trailer does not constitute an indivisible unit. Splitting divisible goods across trips is legally required rather than claiming ODC status.
• Exceeding Rule 93 dimensions: The consignment must exceed the permissible overall width, length, or height prescribed for commercial motor vehicles in Rule 93 of the Central Motor Vehicles Rules, 1989. Under Rule 93, the maximum permissible overall width for standard goods transport commercial vehicles is 2.60 metres. The maximum permissible length is 12.00 metres for rigid two-axle or multi-axle trucks, 18.75 metres for articulated tractor-trailer combinations, and 25.25 metres for road trains. The standard maximum height is 4.00 metres (or 4.75 metres for specialized construction equipment vehicles and ISO container hauliers). Consignments exceeding these boundaries qualify as ODC.

How the portal counts days under Explanation 1

A common operational mistake in logistics departments is assuming that each validity day runs for an exact 24-hour block from the generation timestamp. Explanation 1 to Rule 138(10) establishes a specific formula for calculating the expiry date:

“the ‘relevant date’ shall mean the date on which the e-way bill has been generated and the period of validity shall be counted from the time at which the e-way bill has been generated and each day shall be counted as the period expiring at midnight of the day immediately following the date of generation of e-way bill.” Explanation 1 to Rule 138(10), CGST Rules

Under this statutory mechanism, the day on which the document is generated does not expire at the close of that calendar day. Instead, the first day expires at 11:59 PM (midnight) of the calendar day immediately following the generation date. Every subsequent day granted by the distance calculation adds another 24 hours expiring at midnight.

Worked calculations: ODC validity across transit distances

Let us review how the statutory formula applies to three realistic industrial shipments moving across varying distances in India.

Mathematical breakdown of the examples

Here is how the dates are derived under the rules:

• Consignment A (150 km): Dividing 150 km by 20 km yields 7.5. Under Rule 138(10), any fraction or part thereof grants one additional day. This yields 7 plus 1, equaling 8 days. Generated on 19 October 2026 at 10:30 AM, Day 1 ends at midnight of 20 October. Adding 7 more days sets the expiry at midnight (11:59 PM) of 27 October 2026. For regular cargo, 150 km gives only 1 day, expiring on 20 October at midnight.
• Consignment B (450 km): Dividing 450 km by 20 km yields 22.5. Rounding up the fractional 10 km yields 23 days. Generated on 19 October 2026 at 04:15 PM, Day 1 expires on 20 October at midnight. Adding 22 subsequent days sets the expiry at 11:59 PM on 11 November 2026.
• Consignment C (1,200 km): Dividing 1,200 km by 20 km yields exactly 60 days with zero remaining balance. Generated on 19 October 2026 at 09:00 AM, Day 1 expires on 20 October at midnight. Adding 59 subsequent days sets the portal expiry at 11:59 PM on 18 December 2026.

Step-by-step portal procedure for generating an ODC e-way bill

To ensure that the common portal applies the 20 km calculation rather than the 200 km rate, dispatchers must record the vehicle configuration correctly in Part B:

1. Sign in to common portal: Log in to the official system at ewaybillgst.gov.in with your registered login credentials.
2. Initiate new entry: On the left menu dashboard, navigate to e-Waybill and select Generate New.
3. Complete transaction details: Select the outward supply type, document type (Tax Invoice or Delivery Challan), document number, and date. Enter the consignor and consignee GSTIN details.
4. Enter item and distance details: Enter the HSN code, product description, taxable value, and applicable tax rates. In the transport details section, enter the PIN-to-PIN transit distance.
5. Select ODC vehicle type: In the Part B conveyance section, select Road as the mode. In the Vehicle Type dropdown list, select Over Dimensional Cargo (ODC) instead of Regular.
6. Enter vehicle registration: Provide the mechanical puller or hydraulic multi-axle trailer registration number without special characters, select the transporter document date, and click Submit.

For official instructional diagrams and field validation guides on Part B updates, consult the official GSTN procedural documentation on tutorial.gst.gov.in.

Managing transshipment and mechanical breakdowns in Part B

ODC movements frequently face roadside breakdowns, hydraulic fluid leaks, flat tyres across multi-axle lines, or tractor puller failure. In other cases, cargo must undergo transshipment to a trailer with a different axle configuration to meet state highway bridge safety norms.

Under Rule 138(5) of the CGST Rules, whenever goods are transferred from one conveyance to another, the transporter or person who furnished Part A must update the new vehicle details in Part B before initiating further movement. The portal records the change, maintains the audit history, and preserves the original e-way bill number.

For detailed rules on handling logistics hubs and multi-hop transport legs, consult our dedicated guide on e-way bill multi-hop transshipment hub rules. If a sudden equipment failure strands your vehicle past midnight, read our practical playbook on handling e-way bills expired during transit breakdown.

Statutory extension window under Rule 138(10) second and third provisos

Where exceptional circumstances prevent the carrier from completing the journey before the expiry timestamp, the transporter possesses legal authority to extend the validity period. The second proviso to Rule 138(10) permits extension after updating the details in Part B of Form GST EWB-01.

The time boundary for applying on the portal is strictly defined in the third proviso to Rule 138(10):

When extending validity, the transporter must perform the following actions on ewaybillgst.gov.in:

1. Navigate to e-Waybill → Extend Validity.
2. Enter the 12-digit e-way bill number and click Go.
3. Select whether the cargo is In Movement or In Transit (stranded at roadside, weighbridge, or workshop).
4. Select the reason for extension: Breakdown, Transshipment, Traffic Congestion, Route Diversion, or Other.
5. Enter the current location name and the current pin code where the vehicle is physically stationed.
6. Enter the remaining distance in kilometres to the destination pin code. The portal will automatically calculate and append additional validity days using the 20 km per day rule.

To master the detailed procedural nuances of time calculations, read our guide on e-way bill expiry extension under Rule 138(10).

Penalties under Section 129 for transit with expired e-way bills

Allowing an ODC consignment to crawl on the highway after the e-way bill has expired without submitting an extension exposes the cargo to immediate detention under Section 129 of the CGST Act.

Section 129(1)(a) provides that where any person transports goods in contravention of the provisions of the Act or rules, the goods and conveyance are liable to detention or seizure and shall be released only on payment of a penalty equal to 200% of the tax payable on such goods. On high-value capital equipment worth ₹1,15,00,000 subject to 18% GST (tax of ₹20,70,000), the mandatory penalty is ₹41,40,000 in direct cash payout.

For detailed steps on handling detention orders and securing bank guarantee releases under Form GST MOV-08, review our statutory guide on e-way bill detention under Section 129 and penalty payment.

Related guides

• E-way bill for equipment and machinery moving for site work
• E-way bill detention under Section 129: bank guarantee and Form GST MOV-08
• E-way bill for goods sent for job work and Form GST ITC-04 reconciliation
• E-way bill blocking for non-filing under Rule 138E
• E-way bill multi-vehicle movement update guide

Frequently asked questions

Last checked: 19 October 2026. Sources: CBIC CGST Rule 138, CBIC Notification No. 12/2018-Central Tax, CBIC CGST Act Section 129, E-Way Bill System Portal, GSTN Returns Portal Tutorials.