Subcontracting in Manufacturing: Process, Benefits, Risks, and Control

Subcontracting can help a manufacturer grow faster, handle specialization, and manage capacity pressure. But if it is not controlled properly, it can also create material loss, delivery delays, quality issues, unclear costing, and poor visibility.

Many SMEs send material to outside vendors for processes like machining, heat treatment, plating, powder coating, fabrication, printing, packing, or assembly. The work may be necessary because the process is specialized, capacity is limited, or the outside vendor is more cost-effective.

The challenge is control. Once material leaves the factory, the business must still know what was sent, to whom, for what process, in what quantity, by when it should return, what came back, what was rejected, and what cost was incurred.

This guide explains subcontracting in manufacturing, process steps, benefits, risks, and how AICAN Optiwise helps SMEs improve subcontracting visibility.

Note: This article is for general operational understanding only. Tax, GST, contract, compliance, labour, and legal treatment of subcontracting may vary by arrangement and jurisdiction. Please consult qualified professionals for specific advice.

What Is Subcontracting?

Subcontracting is the practice of assigning a part of production or service work to an outside vendor.

In manufacturing, it often means sending material or semi-finished goods to a vendor for a specific process and receiving the processed material back.

Examples include:

• heat treatment
• anodizing
• electroplating
• powder coating
• CNC machining
• laser cutting
• printing
• assembly
• packaging
• testing

Why Manufacturers Use Subcontracting

Manufacturers use subcontracting to:

• access specialized capability
• reduce capital investment
• handle peak demand
• improve flexibility
• reduce internal bottlenecks
• meet urgent deadlines
• outsource non-core processes
• improve cost efficiency where suitable

Subcontracting can be strategic when controlled well.

Subcontracting Process

1. Identify Outside Process

Define which operation will be done by the subcontractor.

2. Select Vendor

Choose based on quality, capability, lead time, cost, compliance, and reliability.

3. Issue Material

Record what material or semi-finished goods are sent.

4. Track Vendor Job

Monitor expected return date, pending quantity, and process status.

5. Receive Processed Material

Record actual receipt quantity.

6. Inspect Quality

Check whether the processed material meets specification.

7. Record Rejection or Shortage

Capture loss, rejection, rework, or shortage.

8. Book Cost

Record subcontracting charges and related cost.

Example in Manufacturing

A fabrication unit sends 500 welded frames for powder coating. The vendor returns 490 accepted pieces, 5 pieces with coating defects, and 5 pieces delayed.

If the business tracks only the vendor invoice, it misses operational details. It should know material sent, received, rejected, pending, and cost per job.

Risks in Subcontracting

Material Loss

Material may be misplaced, damaged, or not returned fully.

Quality Problems

Outside processes may fail specification.

Delivery Delay

Vendor delays can affect customer commitments.

Cost Leakage

Charges may not be linked to job or product costing.

Poor Traceability

The business may not know which batch went to which vendor.

Dependency

Overdependence on one vendor creates risk.

How to Control Subcontracting

Use subcontracting challans or issue documents.

Track vendor-wise pending material.

Record expected return dates.

Inspect received material.

Capture rejection and shortage.

Link subcontract cost to job or product.

Review vendor performance.

Use alternate vendors for critical processes where possible.

How ERP Helps

ERP helps track subcontracting from material issue to return.

A connected ERP can:

• record material sent to subcontractor
• track vendor-wise pending quantity
• link subcontracting with work orders
• record receipt after process
• capture rejection and shortage
• track subcontracting charges
• show pending vendor material reports
• improve costing visibility
• support dispatch planning

Optiwise by AICAN helps SMEs connect subcontracting with inventory, production, quality, and reporting so outside processes remain visible.

Founder’s Note

At AICAN, we believe subcontracting should expand capability, not reduce control. The moment material leaves the factory, visibility becomes even more important.

AICAN Optiwise helps manufacturers track outsourced process movement so subcontracting supports growth without creating blind spots.

FAQs

What is subcontracting in manufacturing?

Subcontracting is assigning part of production or processing work to an outside vendor.

Why do SMEs use subcontracting?

They use it for specialized processes, capacity support, cost flexibility, and faster execution.

What are subcontracting risks?

Risks include material loss, quality issues, delivery delay, poor costing, and weak traceability.

How should subcontracting be tracked?

Track material issued, vendor, process, expected return, received quantity, rejection, shortage, and cost.

How does Optiwise help subcontracting?

Optiwise by AICAN connects subcontracting with inventory, production, quality, cost, and vendor reports.