What Is a Tariff and How Does It Work?

Tariffs are an important part of international trade, but they can also create uncertainty for businesses buying or selling goods across borders.

A change in tariff policy may increase the cost of a shipment, affect the price a business charges its customers or make one supplier less competitive than another. For companies involved in cross border payments, tariff changes may also influence payment timing, currency requirements and working capital planning.

Understanding what tariffs are and how they are calculated can help businesses estimate their costs more accurately and make better informed decisions about suppliers, markets and pricing.

What is a tariff?

A tariff is a charge imposed by a government on goods entering its customs territory. Tariffs are generally collected by the customs authority of the importing country when the goods arrive at the border.

The World Trade Organization describes tariffs as customs duties applied to merchandise imports. They can give locally produced goods a price advantage over similar imported products while generating revenue for the government.

Although tariffs are often described as taxes on foreign businesses, the importer or importer of record is normally responsible for paying the charge to customs. A customs broker, freight forwarder or carrier may make the payment on the importer’s behalf, depending on the shipping arrangement.

That does not necessarily mean the importer bears the entire economic cost. The importer may:

• Absorb the cost: The business may accept a lower margin rather than raise its prices.
• Raise prices: Some or all of the tariff may be passed on to distributors or customers.
• Renegotiate terms: The importer may ask its supplier to reduce the price or share the additional expense.
• Change suppliers: The business may source the goods from a market with a lower applicable tariff.

Who ultimately carries the cost may therefore depend on contracts, bargaining power, customer demand and the availability of alternative products.

How do tariffs work?

The exact process varies between customs territories, but several factors normally determine whether a tariff applies and how much the importer must pay.

• Classify goods: The product is assigned a tariff classification, usually based on the international Harmonized System.
• Confirm origin: Customs rules determine the country of origin, which may differ from the country where the goods were shipped.
• Determine value: The customs value is established under the rules of the importing market.
• Find the rate: The relevant tariff schedule is checked for the applicable standard, preferential or additional rate.
• Calculate duty: The rate or fixed charge is applied to the customs value, quantity, weight or another defined measure.
• Clear customs: Applicable duties and other charges are normally settled as part of the customs clearance process.

The World Customs Organization explains that imported goods must first be classified under a tariff heading. That classification, together with other factors, helps determine the amount of customs duty payable. The Harmonized System provides a shared international framework, but individual customs authorities may add further digits and local requirements to a product code.

Country of origin can also affect the rate. Goods that meet the requirements of a trade agreement may qualify for a reduced or zero tariff. Goods that do not meet those rules may be charged the standard rate, even when they were shipped from a country covered by the agreement.

A simple tariff calculation

Suppose a business imports goods with a customs value of USD 20,000 and the applicable ad valorem tariff is 8%.

The simplified calculation is:

USD 20,000 × 8% = USD 1,600 tariff

The goods would therefore have a cost of USD 21,600 after the tariff is added, before any other applicable taxes, transport costs, insurance, brokerage charges or handling fees.

This is only a basic illustration. Customs value may include adjustments that differ from the amount shown on the supplier’s invoice. The WTO Customs Valuation Agreement generally uses the transaction value as its starting point, subject to required conditions and adjustments.

What is the purpose of a tariff?

Governments may introduce tariffs for several economic, strategic or political reasons.

• Protect industries: A tariff may make imported goods more expensive relative to similar products made domestically.
• Raise revenue: The government receives income from tariffs collected on eligible imports.
• Respond to practices: Additional tariffs may form part of a response to dumping, subsidies or another disputed trade practice.
• Support sectors: Governments may use tariffs to support industries they consider economically or strategically important.
• Influence imports: A higher rate may discourage imports of a particular product or change where businesses source it.
• Gain leverage: Tariffs may be used during wider trade negotiations or disputes.

Some tariffs are introduced as temporary safeguard measures. Under WTO rules, a member may restrict imports of a product for a limited period when a sharp increase in imports causes, or threatens to cause, serious injury to a domestic industry.

The outcome may not always match the original policy objective. A tariff may support some domestic producers while increasing costs for other local businesses that rely on imported components or materials.

What are the main types of tariffs?

Tariffs can be calculated in several ways.

Type of tariff	How it’s calculated	An example
Ad valorem	A percentage of the customs value	8% of the value of imported furniture
Specific	A fixed amount for each unit, weight or quantity	USD 100 for each tonne imported
Compound	A percentage charge combined with a fixed charge	5% of value plus USD 20 per unit
Tariff rate quota	A lower rate applies within a set limit and a higher rate applies above it	10% for the first 1,000 tonnes and 40% above that amount

Ad valorem tariffs are among the most common. The WTO defines them as tariff rates charged as a percentage of price. A specific tariff is instead charged as a fixed amount per quantity, such as an amount per tonne. Compound tariffs combine both approaches.

Tariff rate quotas are frequently associated with agricultural trade. The WTO explains that imports within the stated quota receive a lower tariff, while imports above the quota face a higher rate.

Tariffs, duties, taxes and quotas: What is the difference?

These terms are related, but they do not always mean exactly the same thing.

	Definition	Relationship to Trade
Tariff	A charge applied to imported goods	Increases the cost of eligible imports
Import duty	A customs charge collected on imported goods	Often used interchangeably with tariff
Tax	A broader compulsory government charge	May apply to income, sales, consumption or imports
Quota	A limit on the quantity or value of imports	Restricts volume rather than adding a percentage charge

“Tariff” and “import duty” are often used interchangeably when discussing charges collected on imported goods. However, “duty” may have a wider meaning in some jurisdictions and can include other customs charges.

Taxes are broader. An imported product may face a tariff and a consumption tax, such as value added tax or sales tax, depending on the destination market.

A quota works differently because it limits how much of a product can enter a market. A tariff does not normally impose a direct quantity limit, although a sufficiently high tariff may reduce demand for the imported product.

A tariff rate quota combines elements of both. A defined quantity may enter at a lower rate, while goods imported above that limit face a higher tariff.

What are the advantages and disadvantages of tariffs?

The effects of a tariff depend on the product, rate, duration and wider economic environment. Here are the potential pros and cons to tariffs: 

Potential Advantages	Potential Disadvantages
May offer temporary support to domestic producers	May increase costs for importers and customers
Generates revenue for the government	May increase the price of imported materials
May protect strategically important production	Can reduce competitive pressure
Can form part of a response to disputed trade practices	May lead to retaliatory tariffs
May encourage some local investment	Can create uncertainty for supply chains

Tariffs may benefit businesses that compete directly with imported products. However, businesses using imported machinery, components or raw materials may face higher input costs.

The OECD notes that tariffs on intermediate products increase the cost of inputs. Its analysis also indicates that rising trade barriers may increase manufacturing costs and reduce supply chain flexibility.

Tariffs may also prompt another country to impose its own measures in response. This can leave exporters facing higher costs or reduced demand in several markets at once.

What are some real world examples of tariffs?

Tariffs appear in many forms across national customs schedules.

Percentage tariffs on goods

An ad valorem tariff applies a percentage to the customs value. For example, a shipment valued at USD 50,000 with a 10% tariff would generate a tariff charge of USD 5,000, subject to the relevant valuation rules.

This type of tariff changes automatically with the declared customs value. A more expensive shipment normally produces a larger tariff charge.

Fixed tariffs by quantity

A specific tariff may be calculated according to weight, volume or the number of units imported. The WTO gives the general example of a fixed amount such as USD 100 per tonne.

This approach means the charge may remain the same per unit even when the market value of the product changes.

Tariff rate quotas

Agricultural products are a common area for tariff rate quotas. A market may permit a specified quantity to enter at a lower rate, after which a higher tariff applies.

For importers, this can make the timing of a shipment and the remaining quota allocation commercially important.

Trade remedy tariffs

Governments may apply additional duties following investigations into practices such as dumping. The WTO describes anti dumping action as an additional import duty intended to bring a product’s export price closer to its normal value or address injury to the importing country’s industry.

Rates, classifications and trade measures can change. Businesses should confirm current information using the destination market’s official customs database or the WTO’s tariff data resources.

How do tariffs affect global businesses?

Tariffs can affect much more than the amount paid at customs.

• Landed cost: The tariff becomes part of the total cost of bringing goods into a market.
• Profit margin: A business may earn less if it absorbs the charge rather than changing its prices.
• Customer pricing: Passing on the cost may make a product less competitive or reduce demand.
• Cash flow: Importers may need more funds available before customs releases the goods.
• Supplier terms: Businesses may renegotiate prices, delivery terms or responsibility for import charges.
• Inventory plans: Companies may change order sizes or shipment dates when tariff rates are expected to move.
• Market access: Higher tariffs may make it harder to compete in a particular destination.
• Currency needs: Businesses may need to account for both tariff charges and currency movements when estimating costs.

For cross border ecommerce sellers, tariffs may affect the final price of goods sold into another market. Sellers should establish whether they, their marketplace, their logistics provider or the customer is responsible for import charges.

Businesses that pay overseas suppliers should also consider how tariffs interact with purchase prices and payment terms. A supplier invoice may represent only part of the final landed cost.

Payoneer provides international payment services covering more than 190 countries and territories, subject to eligibility, availability and applicable terms.

How can businesses adapt to changing tariffs?

Tariffs cannot always be predicted or avoided, but businesses can take steps to understand their exposure and prepare for possible changes.

• Check classifications: Confirm that each product has the correct tariff code rather than relying solely on a supplier’s description.
• Verify origin: Review where the goods were produced and whether they meet any applicable origin requirements.
• Monitor sources: Follow official customs publications, tariff databases and government announcements in relevant markets.
• Model scenarios: Calculate how several possible tariff rates could affect landed cost, margin and customer pricing.
• Review contracts: Clarify which party is responsible for tariffs, customs declarations and other import expenses.
• Assess suppliers: Compare sourcing options, but include quality, reliability, transport and compliance costs in the decision.
• Plan cash flow: Allow for duties that may need to be paid before the shipment is released.
• Seek advice: Consult a qualified customs broker, trade adviser, legal professional or tax professional when the rules are unclear.

Currency movements may add another variable when suppliers, customs authorities and customers use different currencies. A currency conversion calculator can provide a general estimate when modelling international transaction costs, although the applicable transaction rate may differ.

A multi currency account may also help eligible businesses manage funds used for different international transactions. Currency conversion services should be considered in connection with a specific payment or transaction and remain subject to availability and applicable fees.

Businesses operating across several routes can also review Payoneer’s global payment capabilities when planning how to pay suppliers or other business partners.

Understanding tariffs can support better planning

Tariffs can influence sourcing, pricing, margins, cash flow and demand. The applicable charge often depends on a combination of product classification, customs value, origin and the trade measures in force when the goods enter the destination market.

Businesses should avoid treating an old tariff rate as permanent. Monitoring official information and modelling several cost scenarios can make it easier to respond when policies change.

Tariffs are only one part of international operations. Businesses may also need to manage logistics costs, currency conversion and methods for receiving international business payments. For a broader overview of moving funds between markets, read Payoneer’s guide to global money transfers.