What is Tariff?
A tariff is a tax imposed by a government on imported goods, raising the cost to domestic importers. Tariffs are used to protect domestic industries from foreign competition, raise government revenue, or as a geopolitical tool. Trump-era US tariffs (2018-2020, 2025+) have been a major source of global currency volatility.
Definition
Tariffs come in several forms: (1) ad valorem tariffs — percentage of import value (e.g., 25% on Chinese steel); (2) specific tariffs — fixed amount per unit (e.g., $0.15 per pound of cheese); (3) compound tariffs — combine both. Tariffs are typically administered by customs agencies (US Customs and Border Protection, UK HM Revenue & Customs). Major trade agreements (USMCA, EU-Mercosur, RCEP, CPTPP) typically reduce or eliminate tariffs between participating countries — "Most Favored Nation" status grants countries baseline non-discriminatory tariff treatment under WTO rules. Tariffs typically have currency effects: importing-country currency tends to strengthen (less import demand reduces FX outflow); exporting-country currency tends to weaken (export demand declines). The 2018-2020 Trump-China tariffs accelerated CNY weakening from 6.27 to 7.05+.
Worked example
In April 2025, the Trump administration imposed 25% tariffs on Mexican imports as a negotiating tactic on border policy. Within days of the announcement: USD/MXN rose from 20.3 to 21.5 (MXN weakness on expected reduced US-Mexico trade flow); the S&P 500 fell 2.1% on tariff-uncertainty risk-off; Mexican equity index fell 3.5%; companies with high US-Mexico supply-chain exposure (auto manufacturers, agricultural producers) saw stock declines. The tariffs were partially rescinded after Mexico made border commitments — illustrating how tariffs serve as negotiating leverage as much as economic policy. USMCA originally eliminated most US-Mexico tariffs in 2020, so the 2025 reimposition was unusual.
Why it matters
Tariff cycles drive currency moves across affected pairs. For travelers and businesses, tariff announcements signal: short-term currency volatility in affected pairs, potential price increases on tariff-affected imports (electronics, autos, food), and broader risk-off sentiment that strengthens safe-haven currencies (USD, JPY, CHF) at the expense of commodity and EM currencies. The Trump-era tariff cycles (2018-2020 and 2025+) have produced sustained MXN, CAD, CNY, and EUR weakness during periods of active tariff threats and partial recoveries when threats are withdrawn.
Frequently asked questions
Who pays tariffs — exporters or importers?
Importers pay tariffs to the customs authority of the importing country. So when US imposes 25% tariff on Chinese steel, the US importer (Ford, Caterpillar, US Steel Service Centers) pays the tariff to US Customs. The economic burden is then distributed: importers may absorb the cost (reducing profit margins), pass it to consumers (higher prices), source from non-tariffed countries (supply-chain shift), or pressure exporters to lower prices (rare). Trump's frequent claim that "China is paying the tariffs" is technically incorrect — US importers and ultimately US consumers bear most of the cost.
Why do tariffs strengthen importing-country currencies?
Reduced import volume means less foreign-currency demand. If US tariffs reduce US-China trade by $100B annually, that's $100B less in CNY demand from US importers. Mathematically, this should support USD/CNY (USD strength). The empirical evidence is mixed — 2018-2019 USD did strengthen against CNY during tariff escalation, but other factors (Fed tightening, China property stress) also contributed. The currency effect is typically modest and short-term unless tariffs are very large or sustained.
What's the relationship between tariffs and inflation?
Tariffs typically increase domestic prices on affected goods, contributing to inflation. The 2018-2019 Trump-China tariffs added 0.3-0.5% to US CPI according to Fed studies. Large tariff increases (10%+ across broad categories) can add 1-2% to inflation in subsequent quarters. The 2025 tariff cycle has been an ongoing inflation risk factor — Fed officials have cited tariff-uncertainty as complicating the inflation-targeting outlook. Importers passing tariff costs to consumers is the primary inflation channel.
Related terms
Trade Deficit
A trade deficit occurs when a country imports more goods and services than it exports. The US has run persistent trade deficits since 1976 — typically $700 billion to $1 trillion annually. Trade deficits typically pressure currencies downward over time but can be sustained indefinitely for reserve-currency countries.
Reserve Currency
A reserve currency is held in significant quantities by central banks and other major financial institutions as part of their foreign-exchange reserves. The US Dollar is the dominant global reserve currency, accounting for approximately 58% of allocated reserves; the Euro is second at ~20%.
Currency Peg
A currency peg is a policy where a country fixes its exchange rate to another currency (or basket of currencies) and uses central-bank intervention to maintain that rate. The Hong Kong Dollar is pegged to USD at 7.75–7.85; the UAE Dirham at 3.6725.