Paid for a mould in China? CBSA may count it as an 'assist' and add it to your dutiable customs value. Here's what that means for your duty bill and how to declare it correctly.
Here's a scenario that catches a lot of Canadian importers off guard. You're sourcing a custom product from China. The factory needs a specific mould to make it — a mould that doesn't exist yet. Your supplier quotes you $8,000 for the tooling cost, you pay it directly, and then separate from that, you pay the per-unit cost for the actual goods. You figure the mould payment is just a setup cost — a one-time fee that's done and dusted before the goods are even made.
What many Canadian importers don't realize is that the Canada Border Services Agency (CBSA) may treat that mould payment as part of the dutiable customs value of your goods. In other words, you may have just increased the duties you owe on every unit in that shipment — without declaring it, and without knowing it. This is what CBSA calls an "assist."
This guide explains what assists are, how they affect your customs value in Canada, which costs qualify as assists, how to declare them correctly, and what happens if you don't.
Under Canadian customs law — specifically under the Customs Act and the Valuation for Duty Regulations — an assist is anything of value that you (the buyer) supply, directly or indirectly, to a foreign manufacturer, free of charge or at a reduced cost, for use in the production or sale of the goods you're importing.
The key concept is this: CBSA wants the customs value to reflect the full economic value of what you're importing. If part of the cost of producing your goods was borne by you — not the supplier — that cost needs to be captured in the customs value and, therefore, in the duty calculation.
This is not a new rule or an obscure technicality. It's built into the World Trade Organization's Customs Valuation Agreement, which Canada adopted through domestic legislation. CBSA auditors specifically look for assists during post-entry verifications, particularly for importers buying custom or private label products.
Canadian law identifies four main categories of assists:
If you supply raw materials, components, or parts to your manufacturer — free of charge or below market price — the value of those materials is an assist. For example, if you send your Chinese supplier fabric from a Canadian supplier to incorporate into a finished garment, the value of that fabric is an assist that needs to be added to the customs value of the finished garments.
This is the most common type of assist in the context of Canadian importers buying from Chinese factories. If you pay for tooling, moulds, dies, jigs, or fixtures that your supplier uses to manufacture your goods, those costs are assists. The value of the assist is added to the price of the goods for customs valuation purposes.
This applies even when the tooling stays at the factory (which it usually does), even when you paid for it as a separate invoice, and even when the tooling is used to produce goods across multiple shipments.
If the tooling costs $8,000 and will be used to produce 4,000 units across two shipments of 2,000 each, you would typically allocate $4,000 of assist value to each shipment. The allocation method should be documented and defensible.
If you pay a designer or engineer to create artwork, technical drawings, product designs, or development specifications that are then provided to your manufacturer — and that work is undertaken outside of Canada — the value of that work may be an assist. Note that if the engineering or design work is carried out in Canada, it is generally exempt from the assists rule.
Certain types of commissions paid to intermediaries in connection with the purchase of goods can affect customs valuation, though the rules here are more nuanced and depend on whether the commission is a buying commission (exempt from duty) or a selling commission (included in value).
Canada uses the transaction value method as the primary basis for customs duty calculation. The transaction value is the price you actually paid for the goods — but it must be adjusted to include assists, plus any royalties and licence fees, plus any proceeds of resale that accrue to the seller, minus certain allowable deductions.
In practice, this means the customs value of your imported goods equals:
Transaction value + assists + applicable royalties and other additions
The duty you pay is then calculated as a percentage of that adjusted customs value. Depending on your product's HS tariff classification and origin, duty rates typically range from 0% (for products from CPTPP or CUSMA countries) to 18% or more (for some Chinese-origin goods). A significant assist amount can meaningfully increase your duty bill — especially across a large order.
Let's illustrate. Suppose you're importing 2,000 units of a custom product from China at $25 per unit (total invoice value: $50,000). The duty rate is 12%. You also paid $8,000 for the mould, which CBSA would treat as an assist allocated to this shipment.
| Item | Value |
|---|---|
| Invoice value (goods) | $50,000 |
| Assist (mould) | $8,000 |
| Customs value | $58,000 |
| Duty at 12% | $6,960 |
| Duty without assist declaration | $6,000 |
| Underpayment | $960 |
That's nearly $1,000 in undeclared duty on one shipment. If this pattern continues across multiple shipments over several years, a CBSA audit could result in a reassessment for the entire period — plus interest that accrues daily. The financial exposure becomes significant quickly.
Assists are easy to miss because the payment flows don't look like import transactions. You paid for tooling on a separate invoice. It was a setup cost. It felt like a business expense, not a customs issue. Your supplier didn't mention it. Your freight forwarder processed the shipment as usual. Your customs broker declared the value based on the commercial invoice — which only showed the per-unit cost, not the mould.
This is the gap: your commercial invoice does not automatically include assists. If you're buying custom or semi-custom products and paying for tooling or development costs, those costs will not appear on the per-unit invoice unless you specifically structure it that way. It's your responsibility as the importer of record to identify and declare assists — CBSA will not prompt you.
Declaring an assist is done through your customs entry. You include the assist value in your customs valuation and adjust the declared value accordingly. Your customs broker can help you structure this correctly.
Here's what you need to document:
The total cost of the assist: The amount you paid (or agreed to pay) for the tooling, materials, or other qualifying cost.
The allocation methodology: If the tooling will be used across multiple shipments, you need a documented method for allocating the cost. The most common approach is to allocate based on the total planned production run. If you expect the mould to produce 10,000 units over five shipments, you allocate one-fifth of the mould cost to each shipment. If actual production differs from the plan, you may need to adjust.
Supporting invoices: Keep the invoice for the tooling or other assist payment. CBSA may ask for this during a verification.
A memo to your customs broker: Inform your broker of the assist and the allocation before they file the entry. Don't assume they know — they can only work with the information you give them.
Failure to declare an assist is an undervaluation error under the Customs Act. Depending on whether CBSA views it as an innocent mistake or a misrepresentation, consequences can include:
A re-determination of customs value: CBSA can issue a formal re-determination and demand payment of the shortfall, plus interest (currently calculated at the Canada Revenue Agency prescribed rate).
Administrative monetary penalties (AMPs): Undervaluation carries AMP exposure. First-time violations for lower amounts may be relatively minor, but repeat violations or large amounts can attract significant penalties.
Audit triggers: If CBSA identifies an assist issue through verification, they will typically audit the full importation history with that supplier — not just the shipment in question. This expands the exposure retroactively.
Under CBSA's CARM system, importers now have greater visibility into their duty accounts and reassessment notices. That also means CBSA has better tools to identify patterns and flag accounts for review.
Injection moulds for plastic products: Very common. You pay for the mould upfront. The mould stays at the factory. Subsequent orders use the same mould. Each shipment carries a share of the mould cost as an assist.
Die casting tools for metal components: Same structure as injection moulds. The dies are expensive and the assist value can be substantial.
Packaging artwork and printing plates: If you commission artwork from a designer outside Canada and provide it to your supplier, the design cost may be an assist.
Embroidery patches or labels supplied to garment factories: If you purchase labels or patches from a third party and send them to your garment manufacturer, the cost is an assist.
Sample and prototype development: Paid development work done by your supplier as part of the initial product design (where you pay separately for development) may qualify as an assist if it relates to the production tooling or process.
If you're buying from a related party — a supplier in which you have an ownership stake, or a company controlled by the same parent — CBSA applies additional scrutiny to the transaction value. Related-party pricing is more likely to be reviewed for accuracy, and assists in that context can become part of a broader valuation dispute. If this applies to your situation, get professional advice before your first import.
No. The mould doesn't need to change location. The assist is defined by the economic contribution — you paid for something that enabled the production of your goods. It doesn't matter that the asset stays at the factory.
Not for customs valuation purposes. CBSA looks at the economic substance of the transaction. A separately invoiced tooling payment that relates to the production of goods you're importing is still an assist — the invoicing structure doesn't change the legal classification.
If you import the mould itself into Canada as a physical good, that's a separate importation and you'd pay duty on the mould. The assist question relates to goods produced using the mould while it's abroad.
Your broker can only declare what you tell them. If you've been paying for tooling without disclosing it to your broker, there may be unreported assists in your importation history. It's worth reviewing past transactions and, if necessary, making a voluntary disclosure to CBSA. Voluntary disclosure before an audit generally results in more favourable treatment than being caught during a review.
Use your best estimate of total production volume at the time of the first shipment. Document that estimate and the methodology. If actual production deviates significantly from the estimate, adjust the allocation going forward. Keep a record of your calculations — CBSA will want to see that you applied a reasonable and consistent method.
Assists are exactly the kind of issue that falls between the cracks when you're managing sourcing on your own. Your factory doesn't tell you. Your forwarder doesn't know. Your broker doesn't ask. And you end up with a compliance gap that could surface years later during an audit.
At Epic Sourcing Canada, we help Canadian importers build sourcing programs that are commercially sound and compliance-ready from day one. That includes understanding which costs qualify as assists, how to structure your purchasing to make accurate declarations straightforward, and how to work with your customs broker to file entries that will hold up to scrutiny.
If you're buying custom products from China and you've been paying for tooling or development costs without considering the assist implications, now is a good time to review your exposure. Get in touch with the Epic Sourcing Canada team — we're happy to talk through your situation and help you import with confidence.
