Raw materials went to the subcontractor, finished goods returned weeks later; meanwhile, inventory appears neither on the shelf nor in production. This gap looks like a "loss" during inventory counts and distorts cost calculations.
In subcontracted manufacturing, even though goods are outside, records must be kept inside; shipment, external inventory, return, and cost are links of the same chain. When a link breaks, the whole chain becomes unreliable.
In this article, we explained the subcontracting workflow, inventory ownership, and cost recording step by step.
Table of Contents
Why is subcontracting tracking critical?
Subcontracting expands capacity, but if record-keeping is weak, both inventory and costs get corrupted together. Goods outside should not appear as "non-existent".
EQLEM is a solution platform that works alongside your existing ERP/system. Subcontracting operation records can be maintained without disrupting the financial document flow.
Untracked subcontracting leaves scrap disputes without evidence. Without evidence, each party defends its own calculations.
The delivery date given to the customer also depends on the subcontractor; invisible work produces false promises. Visibility is the quality of a promise.
Therefore, subcontracting is not a separate "off-the-books channel", but part of the production process. The same discipline and clarity are required.
Shipment record to subcontractor
The dispatch document records which material went to which subcontractor and in what quantity. An exit without a document is a loss during inventory counts.
If there is lot or batch information during shipment, it must be carried over; traceability must not be cut off externally either. A broken lot makes recalls impossible.
The subcontractor card and work order number must be linked to the shipment line. An unlinked shipment is a pile whose destination job is unknown.
The expected return quantity and date must be entered at the time of shipment. If there is no expectation, delays will not be noticed.
For shipment discipline, you can check the shipment preparation article.
External stock visibility
Subcontractor warehouse or "external stock" location drops the material from the shelf while keeping it visible. Material is not lost, it changes location.
Using a separate location for each subcontractor makes debt-credit disputes easier. A single pool erases what is in whose hands.
Verify the external balance with periodic reconciliation; the subcontractor's count must match your record. Deviations must be closed before accumulating.
List jobs that have been outside for a long time; a forgotten shipment is a forgotten cost. Aging work is a risk sign.
We discussed the warehouse model in the warehouse groups article.
Incoming finished goods and returns
Returned finished goods must be taken into stock by linking them to the subcontractor job; an unlinked entry leaves it unclear which shipment it closed. An unclosed shipment means bloated external stock.
Missing or excess incoming quantities must be written to the scrap and difference line. A silent difference poisons the next reconciliation.
If there is a quality rejection, open a return or scrap record; rejected finished goods should not look like "good stock". Quality changes the stock type.
Track partial deliveries with separate lines; closing all at once hides the intermediate status. Partial closing shows real progress.
You can compare the difference with the internal production slip in the production slip article.
Subcontractor cost calculation
Product cost is the sum of the outgoing raw material value and the subcontractor labor fee. Looking only at the subcontractor invoice remains incomplete.
If the scrap allowance is defined in the contract, record the exceeding part separately. Excess scrap is a hidden cost item.
Distribute freight and additional expenses to the job; undistributed expenses inflate product profitability. Real cost requires all items.
The document type in the current ERP/system used by the financial advisor may differ; the operation record must be matched with the financial document. Without matching, a dual reality occurs.
We explained general cost tracking in the production cost article.
Contract and scrap rules
Scrap rate, delivery time, and quality criteria must be in writing; verbal agreements fade in disputes. Written rules set the recording standard.
When unit prices change, the impact on open orders must be clarified. Applying new prices to old jobs ruins profit calculations.
Material ownership and insurance responsibility should also be included in the contract. The risk of goods outside must not be left ambiguous.
Keep performance history on the subcontractor card; delay and scrap averages influence selection. Data beats habit.
We discussed the supplier evaluation approach in the supplier evaluation article.
Inventory ownership model
Raw materials originate with you, move to the subcontractor location, and return as finished goods; the owner of each step must be clear. Ambiguous ownership creates duplicate records.
If the financial stock appears different from the current system, determine direction using operational stock. Two-way chaos is worse than one-way clarity.
If there are consignment or customer-owned materials, use separate cards or locations. Intermixed ownership generates incorrect costs.
If negative external stock occurs, audit the shipment-return chain on the same day. Negatives are alarms for process errors.
We explained movement reading in the stock statement article.
Setup steps
First, open subcontractor cards and subcontractor locations; then define the shipment document type. Transactions cannot be recorded without basic definitions.
In the second step, test a sample job end-to-end and obtain reconciliation. Going live without testing creates a pile of discrepancies.
In the third step, open scrap and cost fields. Discussing costs is premature before inventory settles.
In the fourth step, clarify the existing ERP/system document mapping. Ownership decisions are managerial, not technical.
Transactions in the production module runs alongside stock.
Points to consider
Tracking shipments via WhatsApp kills official records. Messages do not replace documents.
Gathering all subcontractors in a single location makes reconciliation impossible. Separate locations mean separate accounts.
Entering returned finished goods as a "purchase" breaks the chain. The chain must be tied to the shipping operation.
Ignoring scrap inflates both stock and costs simultaneously. Real scrap equals real profit.
Clear out lingering open jobs weekly; aging subcontracting work is forgotten risk.
What changes in practice?
The question "Where is the goods?" is answered on the screen; phone tag ends. Visible stock means visible responsibility.
Scrap disputes become evidence-based, and subcontractor selection relies on data. Performance is discussed instead of habit.
Product cost is read as raw material plus subcontracting fee. Incomplete cost leads to wrong pricing decisions.
Delivery dates are tied to subcontracting progress; surprise delays decrease. The plan covers external work as well.
Read the traceability need along with the article on traceability in assembly production.
Frequently asked questions
Does subcontracted material deduct from our stock?
It drops from the shelf but remains visible in the subcontractor location; the goal is not to lose it, but to know its whereabouts.
Is the existing accounting software not sufficient?
Financial documents often do not carry operational details; a separate operation record is required for the shipment-return chain.
How are partial deliveries tracked?
They are tracked with multiple entry lines tied to the same subcontracting job; it remains open until the job is fully closed.
Is lot information preserved when sending to a subcontractor?
It must be preserved; for details, batch lot tracking see the article.
The power of contract manufacturing turns into the greatest weakness when left unrecorded. Even if the goods are outside, records must be kept inside.
Link shipment, external stock, and return to the same work order. Unlinked movement means unlinked responsibility.
Align scrap and cost rules through contracts; shift debates to data. Written rules produce fair accounting.
Separate subcontractor locations and weekly clear out aging jobs. A forgotten shipment is a forgotten risk.
Clarify document ownership upfront with your current ERP/system; two realities are unsustainable.
By speaking with the EQLEM team, you can clarify your contract manufacturing tracking scope.