Stock Throughput Claims in India: Marine Cargo Plus Storage, Concurrent Causation, and Sum Insured Mechanics

Stock throughput (STP) insurance is a combined cargo and storage product designed to cover goods as they move through supply chains without requiring separate marine cargo and warehouse fire policies. An STP policy provides a single, integrated coverage that automatically follows goods from the moment they leave the supplier's location, through transit, into port storage facilities, through customs clearance, into warehouse or factory storage, and finally to the buyer's location. The fundamental value of STP insurance is that it eliminates coverage gaps that exist when companies rely on separate cargo and storage policies.

In India, traditional supply chain insurance relies on an open cover marine cargo policy (which covers transit from supplier to port and from port to buyer's location) combined with a separate Standard Fire and Special Perils (SFSP) policy for the warehouse storage at the buyer's facility. The coverage gap emerges at Indian ports and inland waterway terminals, where goods spend days or weeks in storage before customs clearance, subsequent loading onto trucks for inland transit, or transfer to cold storage or bonded warehouses. If goods are damaged while in port storage (by rain infiltration, theft, or rough handling during loading), the gap between where the marine cargo policy ends and the warehouse fire policy begins creates ambiguity over which insurer is responsible for the loss.

STP policies resolve this gap by extending coverage across the entire logistics chain. The policy defines coverage as 'in transit and in storage' with no distinction between these phases. This unified approach aligns with the physical reality of supply chain operations in India, where the distinction between 'in transit' and 'in storage' is often artificial, particularly at congested port facilities and container freight stations.

An STP policy combines standard marine cargo perils with standard fire and special perils coverage. Marine cargo perils include loss or damage caused by sinking of the vessel, collision, grounding, jettison, fire, explosion, piracy, sea water ingress, and damage during loading or unloading at ports. Storage perils include fire (including smoke damage), explosion, lightning, impact (collision with vehicles), burglary and theft, riots and civil commotion, malicious damage, and in some STP wordings, transit damage on roads and railways (if the goods are being moved by land rather than sea).

The policy is written on an 'all-in' basis, meaning the insurer is liable for loss or damage caused by any of the covered perils, regardless of whether the goods are classified as being in transit or in storage at the moment of loss. The insured does not need to notify the insurer each time goods move from one location to another; the coverage automatically extends as long as the goods remain within the geographical scope of the policy (typically India including ports, warehouses, factories, and retail locations, plus nominated transit corridors outside India).

STP policies often include covers for breakage of glass, crockery, and ceramics (which would be excluded under a standard fire policy but relevant for food and beverage goods), wastage and seepage (relevant for liquids), and mechanical or electrical breakdown (relevant for temperature-sensitive goods in cold storage). The perils excluded from STP policies typically include inherent vice (natural deterioration of goods), war, strikes and political unrest (unless specifically endorsed), and delay in delivery (insurable under contingency insurance, not cargo insurance).

Concurrent causation arises in STP claims when multiple causes contribute simultaneously to a loss, and some causes are covered while others are excluded. A common example in Indian STP claims is a warehouse fire caused by an electrical short circuit during a power outage that occurred because the backup generator failed. The underlying cause (electrical fault) is covered; the intermediate cause (power outage and backup failure) is a maintenance issue; and the proximate cause (fire) is covered. Whether the claim is paid depends on whether the policy applies the 'but-for' rule (but-for the power outage, the fire would not have occurred) or the 'proximate cause' rule (the immediate, active cause of the loss is the electrical fault, which triggered the fire).

Indian commercial policies and STP policies typically apply the proximate cause doctrine: the loss is indemnified if the proximate cause is a covered peril. Under this approach, the electrical short circuit fire claim would be covered even though maintenance failure contributed to the loss. However, disputes arise when the proximate cause is ambiguous. A classic STP scenario is a theft from a warehouse where the thief gained entry through a broken lock and damaged goods in the process. If the warehouse owner failed to repair the lock (a maintenance failure), is the loss caused by the insured's negligence or by the covered peril of theft and burglary? Indian courts have held that negligence of the insured does not defeat coverage under the proximate cause rule unless the policy explicitly states that the insured must use due care to prevent loss.

Another concurrent causation scenario common in STP claims involves goods damaged in transit by monsoon rains leaking into a container, compounded by the container being stacked incorrectly at the port. The loss is caused proximately by rain (a covered peril under 'weather' in some STP wordings) and contributory by incorrect stacking (an avoidable exposure). The insurer may argue that the loss was avoidable and the insured's failure to ensure correct stacking is a breach of the warranty of due care. Indian case law has been mixed on this; some courts hold that the insured's failure to implement best practices (proper stacking) is relevant only if the policy contains a warranty of due care, while others treat it as evidence of breach of the duty of utmost good faith.

STP policies are typically written on a floating sum insured basis, meaning the sum insured is not fixed at any particular location or for any particular shipment. Instead, the policyholder declares the maximum value of stock in transit and storage at any point in time, and the sum insured floats to cover declared goods up to that limit. A manufacturer importing raw materials with a declared peak working capital of INR 2 crore might have only INR 50 lakh in stock on any given day, but the floating sum insured of INR 2 crore ensures coverage for peak seasonal demand or for bulk shipments.

The declaration process requires policyholders to report the total value of goods in transit and storage at periodic intervals (usually monthly or quarterly). If the reported stock value exceeds the floating sum insured, the insured is underinsured and the average clause applies: the claim is proportionally reduced. If the reported stock value is consistently below the floating sum insured, the insured is over-insured and paying unnecessarily high premiums. Policyholders should conduct an annual analysis of peak working capital requirements and adjust the floating sum insured accordingly.

The mechanics of the floating sum insured differ from a standard fixed sum insured in claims settlement. If a single loss event (such as a warehouse fire) destroys INR 1.5 crore worth of goods and the floating sum insured is INR 2 crore, the claim is paid in full (subject to deductible and any exclusions). However, if the loss is INR 2.5 crore and the sum insured is INR 2 crore, the average clause applies and the claim is paid at 2/2.5 = 80% of the actual loss. The key is that the floating sum insured operates on a per-loss basis, not on an annual aggregate basis. Each claim is assessed independently against the declared sum insured at the time of loss.

Port theft is a frequent STP claim scenario in India. Goods are unloaded at a container freight station at the port of Mundra or Jawaharlal Nehru Port (JNPT), Mumbai, and while awaiting customs clearance (a process that can take five to ten days), the container is breached and goods are stolen. The loss is clearly within the scope of an STP policy because the goods are in storage (albeit temporary storage) at a facility within the policy territory. The claim is typically covered under the 'theft and burglary' peril, subject to the insured proving that the theft occurred and that the loss was not due to the insured's failure to secure the container. Port authorities maintain CCTV footage and container seals; the surveyor will review these to assess whether the theft was foreseeable and avoidable. If the container seal was intact and the theft occurred through a concealed breach, the claim is usually paid in full. If the seal was tampered with and the insured did not report the breach in a timely manner, the insurer may argue contributory negligence.

Warehouse fire is another common scenario. A manufacturing plant in Pune has an STP policy covering raw materials and finished goods in storage. A fire breaks out in the warehouse (cause later determined to be spontaneous combustion of stored materials) and destroys INR 3 crore worth of inventory. The claim is straightforward: the loss is caused by fire, a covered peril, and the surveyor quantifies the loss by examining the debris, cross-referencing inventory records, and assessing the extent of destruction. The challenge in warehouse fire claims arises when the warehouse is not maintained to fire safety standards: if fire exits are blocked, sprinkler systems are non-functional, or fire suppression equipment is absent, the insurer may argue that the loss was avoidable and the insured breached a duty of care. However, such arguments are complex; the insurer must prove that the specific maintenance failure directly contributed to the loss (for example, a functional sprinkler system would have prevented the fire) rather than merely increasing the risk.

Transit damage during road or rail transport is another common claim. Goods are damaged during transport from a factory to a port or from a port to a customer's location. A truck carrying ceramic tiles overturns on a highway and 40% of the goods are destroyed. The loss is caused by impact (the vehicle overturn), a covered peril. The claim is usually paid in full, subject to the insured proving the value of the goods at the time of loss (through invoices, packing lists, and bills of lading) and the extent of damage (through the surveyor's examination or salvage records). Complex transit claims arise when the loss is attributed partly to impact and partly to the condition of the goods (for example, goods were already deteriorating before the loss and the impact merely exposed the preexisting deterioration). The surveyor must separate the pre-loss condition from the loss caused by the insured peril.

Many Indian companies continue to rely on the combination of an open cover marine cargo policy and a separate SFSP warehouse policy rather than adopting an integrated STP policy. The choice depends on the company's supply chain structure, claim frequency, and negotiating power with insurers.

Open cover plus SFSP is preferred when the company has a large, stable, and well-documented warehouse facility with fixed characteristics. In this scenario, the warehouse fire policy can be tailored to the specific building (sprinkler systems, fire rating, security measures), and the premium can be negotiated based on the warehouse's loss history. Also, the company can work with separate policies from different insurers, allowing it to negotiate discounts and coverage enhancements for each policy independently. Open cover plus SFSP is also easier to manage administratively because the boundaries between marine and fire coverage are clear: goods in transit are covered by the cargo policy, goods in the warehouse are covered by the SFSP.

STP policies are preferred when the company has multiple storage locations (ports, bonded warehouses, contract warehouses, cold storage facilities), unpredictable transit routes, or frequent changes in supply chain partners. In this scenario, the administrative burden of tracking which goods are covered by which policy becomes high, and the risk of coverage gaps increases. An STP policy simplifies administration and ensures seamless coverage as goods move across locations.

From a cost perspective, STP policies are often more expensive than open cover plus SFSP because they assume higher risk exposure (goods are in storage across multiple uncontrolled locations) and the insurer must price for the unknown characteristics of those locations. However, STP policies can offer better value for high-volume, high-velocity supply chains where the cost of claims disputes and coverage gaps (in terms of uninsured losses and administrative delays) exceeds the premium difference.

The floating sum insured in an STP policy must be aligned with the peak value of goods in transit and storage at any given time. A common underinsurance error occurs when the policyholder declares a sum insured based on the average monthly working capital rather than the peak working capital. For example, a company with average stock value of INR 1 crore but peak seasonal stock value of INR 2 crore might declare a sum insured of INR 1.2 crore. If a loss occurs during peak season and destroys INR 2 crore worth of goods, the average clause applies and the claim is paid at only 1.2/2 = 60% of the loss. This is a financially significant error that can be avoided through proper planning at policy inception.

Another underinsurance scenario arises when the policyholder underestimates the replacement cost of goods. If goods are declared at cost price but their replacement value (including import duties, freight, and insurance costs) is higher, the sum insured may be insufficient. This distinction is particularly relevant for imported goods where the final replacement cost includes customs duty. A manufacturer importing machinery with a declared value of INR 1 crore (CIF cost) may face a replacement cost of INR 1.5 crore when including import duties and terminal charges at Indian ports. The STP policy sum insured should reflect the final replacement cost, not just the purchase price.

An additional complexity arises with stock in transit on consignment basis. If a company holds goods on consignment from the manufacturer, the company may have liability for the goods but not clear title or ownership. The STP policy's definition of 'insurable interest' becomes critical: the company must prove it has a legitimate insurable interest in the goods (typically through a consignment agreement that makes it liable for loss) to recover under the policy. Insurers often require sight of consignment agreements before settling claims involving goods the insured does not own.

STP claim settlement follows the standard marine and property insurance settlement process in India. The policyholder files a claim with the insurer, specifying the date, location, nature, and cause of the loss, along with supporting documents (invoices, packing lists, bills of lading, customs clearance papers, photographs, and the surveyor's initial damage assessment). The insurer appoints a licensed surveyor and loss adjuster to investigate the loss, verify the goods' value, quantify the damage, and opine on causation.

The surveyor's report is central to STP claim settlement and will examine several elements. First, the surveyor verifies that the goods were within the geographical scope of the policy at the time of loss (for example, was the container at a covered port, or had it been diverted to an uncovered location?). Second, the surveyor confirms that the cause of loss (fire, theft, impact) is a covered peril under the policy. Third, the surveyor determines the value of goods lost using the invoices and packing lists provided by the insured, and adjusts for any salvage value (the resale value of damaged goods). Fourth, for floating policies, the surveyor confirms that the declared sum insured at the time of loss was adequate and applies the average clause if underinsurance is evident.

After the surveyor's report, the insurer may settle the claim by paying the loss amount to the policyholder minus any deductible and minus any amounts recovered from subrogation. Subrogation in STP claims means the insurer may pursue third-party liability (for example, if a third-party trucking company's negligent driving caused loss of goods, the insurer may sue the trucking company for recovery). In port theft claims, subrogation typically yields no recovery because the thief is not identified; however, in transit accident claims, subrogation may recover a portion of the loss from the transporter's insurer or directly from the transporter if they were negligent. The policyholder generally has no right to refuse subrogation; the insurer pursues it as a matter of course, though the policyholder can request that the insurer include the policyholder in the subrogation settlement to recover its own deductible or uninsured losses.