Understanding Rules of Origin: A Plain-Language Overview

Why rules of origin exist

Free trade agreements reduce or eliminate tariffs on goods traded between signatory countries. But to prevent goods from being routed through a partner country simply to benefit from lower tariffs (trade deflection), FTAs include rules of origin that define when a product genuinely "originates" in a partner country.

Only goods that meet these rules qualify for the preferential tariff rate. Everything else is subject to the standard (MFN) tariff.

Types of origin rules

Most FTAs use one or more of the following criteria to determine origin:

Wholly obtained

The simplest rule: the product must be entirely obtained or produced in the exporting country. This applies mainly to natural products — agricultural goods, minerals, fish caught in territorial waters.

Change in tariff classification (CTC)

The product must undergo sufficient processing in the exporting country such that the finished good is classified under a different HS code heading or subheading than the non-originating materials used to produce it.

For example, if you import raw cotton (HS Chapter 52) and weave it into fabric (also HS Chapter 52 but a different heading), the change in classification may satisfy the CTC rule — depending on the specific agreement.

Value-added (ad valorem)

The product must incorporate a minimum percentage of local value — either as a maximum allowance for non-originating materials or a minimum requirement for local content. This is calculated as a percentage of the ex-works price.

For instance, a rule might state that non-originating materials must not exceed 40% of the ex-works price, meaning at least 60% of the value must be added domestically.

Specific processing

Some product-specific rules require a particular manufacturing or processing operation, regardless of tariff classification changes or value thresholds. For example, a rule might require that certain textiles undergo both weaving and finishing in the exporting country.

Product-specific rules

Most FTAs include an annex listing product-specific rules — a table mapping HS codes to the origin criteria that apply. A single product may have alternative rules (e.g., CTC *or* value-added), and the exporter can choose whichever is met.

Reading these annexes correctly is critical. Misapplying a rule — for example, using the wrong HS code or miscalculating the value threshold — can result in an incorrect origin declaration.

Cumulation

Many FTAs allow cumulation, which means that materials or processing from another partner country can be counted as originating. This is particularly relevant in agreements with multiple parties, such as the EU's PEM convention.

Understanding whether bilateral, diagonal, or full cumulation applies under your specific agreement can significantly affect whether your goods qualify.

Practical implications

For exporters, the key takeaway is that origin is not automatic. Each product must be assessed against the applicable rule for the specific FTA being used. The assessment should be documented, the evidence retained, and the conclusion reviewed when circumstances change — such as a change in suppliers, production process, or input costs.