Customers supply materials we process. Should their value appear in our inventory and sales?
Customer-Owned Materials in a Manufacturing Business. A specific owner scenario, the facts that change the answer, and the records needed for a tax review.
By AE Tax Advisors Team · Updated October 28, 2026
A customer's materials do not automatically become your inventory or revenue merely because they enter your premises. Establish ownership and the service being sold, then record any materials your business actually purchases separately.
A specific business-owner situation
A fabricator processes metal supplied by its customer and charges a conversion fee. The warehouse count includes the customer's metal, while the bookkeeper proposes assigning it purchase cost. Custody records should distinguish customer property from company-owned inputs.
Illustrative example, not a client result.
What to establish before filing
- Confirm ownership and loss responsibility in the contract.
- Separate processing fees from goods the company sells.
- Maintain customer-property counts outside owned inventory.
Which fact changes the answer?
If the agreement actually transfers materials in payment or as part of an exchange, the analysis changes. Have the advisor review that arrangement rather than assuming every customer delivery remains someone else's property.
A mistake to avoid
Counting customer property as an owned asset can inflate inventory and create unsupported costs.
Records that support the decision
- Manufacturing agreement.
- Customer material receipts.
- Production usage records.
- Company purchase invoices.
The decision to document
Keep a custody reconciliation and document the revenue model. Confirm how scrap, excess materials and damaged customer property are settled before the first year-end count.
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Related questions
- We missed a supplier's minimum purchase commitment. Can we deduct the shortfall fee?
- A customer canceled an order for custom goods. When can we write off the unsellable inventory?
Sources and editorial context
General educational information prepared with AI assistance. No individual professional review is claimed. Apply the relevant tax-year rules to the actual records. Editorial policy · AI disclosure.