Taxation
Customs Duties & Tariffs
A tax on goods crossing a border, paid by the importer — historically a simple, easy-to-enforce revenue source, now used more often to shift prices in favor of domestic industry or as a trade and political tool.
Definition
A customs duty (or tariff) is a tax charged on goods as they cross an international border, typically paid by the importerat the point of entry, calculated as a percentage of the good's declared value.
Why this exists
Historically, taxing goods at a border was one of the easiest points for a government to actually collect revenue — a literal chokepoint everything has to physically pass through, simple to inspect and enforce, long before income tax or VAT infrastructure existed. Revenue was the original, primary purpose.
Modern tariffs are more often used for a different reason: deliberately shifting the relative price of imported goods versus domestic ones. Per Supply & Demand, raising a good's price reduces the quantity people buy of it — so a tariff on imported steel makes imported steel more expensive, shifting some buyers toward domestically produced steel instead (the protective effect a government is often deliberately aiming for) and reducing the overall quantity of the imported good purchased.
A common misconception is worth correcting directly here: a tariff is notpaid by the foreign country or exporter. It's paid by the domestic importer bringing the goods across the border. That importer then faces a choice: absorb the added cost itself, accepting a smaller profit margin, or pass some or all of it on to its own customers through a higher price. In practice it's usually a mix of both, split based on how willing buyers are to reduce their purchases in response to a higher price — the same underlying Supply & Demand logic that governs any price change.
Worked example
A company imports $10,000 worth of goods, facing a 15% tariff and a flat $50 customs handling fee.
Duty owed: $10,000 × 15% = $1,500 Total landed cost: $10,000 + $1,500 + $50 = $11,550
If the importer passes the full tariff through, prices to its own customers rise by roughly 15%. If those customers are price-sensitive and would buy substantially less at a higher price, the importer might instead absorb part of the $1,500 itself — accepting a smaller margin rather than losing sales to substitutes — rather than passing all of it through.
Try it yourself
Total landed cost
$11,550.00
Duty owed
$1,500.00
Declared value
$10,000.00
How the math works
Duty owed: $10,000.00 × 15% = $1,500.00. Total landed cost adds the declared value, the duty, and the flat handling fee: $10,000.00 + $1,500.00 + $50.00 = $11,550.00. Whether this cost gets passed on to customers or absorbed by the importer depends on how price-sensitive demand for the good is.
Common misconceptions
“Tariffs are paid by the foreign country or the exporting company.”
Tariffs are paid by the domestic importer bringing goods across the border, not by the foreign government or exporter. This is one of the most common misunderstandings about how tariffs actually work.
“The full cost of a tariff always gets passed on to consumers in higher prices.”
It's typically split between the importer (absorbing some of the cost through reduced margins) and the consumer (paying some of it through higher prices), depending on how sensitive demand for the good is to price changes.
“Tariffs exist only to raise government revenue, like most other taxes.”
Historically revenue was the primary purpose, but modern tariffs are more often used to protect domestic industries from foreign competition or as leverage in trade negotiations and political disputes, with revenue as a secondary effect.
Also in the Glossary: Customs Duty & Tariff