What Are Tariffs? How They Affect Stocks and the Economy

A tariff is a tax imposed by a government on goods imported from other countries. We track how tariff exposure affects quality scores across our stock universe. When the US places a 25% tariff on imported steel, every ton of foreign steel entering the country costs 25% more than it otherwise would. Tariffs are among the oldest tools of economic policy — and they've returned to the center of global markets as trade tensions between major economies escalate.

How Tariffs Work

The importing company pays the tariff to customs when the goods enter the country. Despite political rhetoric about "making other countries pay," the direct cost of tariffs is borne by the domestic importer — a US company importing goods from China pays the US tariff, not the Chinese exporter.

Importers then face a choice: absorb the tariff cost (reducing their profit margins), pass it on to customers (raising retail prices), or source from a different, non-tariffed country (disrupting supply chains). In practice, the cost is usually shared — companies absorb some, customers absorb some, and supply chains gradually adjust.

Why Governments Impose Tariffs

The primary justifications are protecting domestic industries from foreign competition (keeping domestic factories open and workers employed), generating government revenue (tariffs produce tax income), retaliating against trading partners' policies (tit-for-tat trade disputes), and national security (ensuring domestic production of critical goods). The economic debate over whether tariffs achieve these goals without excessive collateral damage has raged for centuries.

How Tariffs Affect Stocks

Companies That Import

Retailers, manufacturers, and technology companies that rely on imported components or finished goods face higher input costs. A consumer electronics company importing devices from Asia sees its cost of goods rise by the tariff percentage. If it can't pass the full cost to customers (because competitors source domestically or from non-tariffed countries), margins compress and earnings decline.

Companies That Compete with Imports

Domestic companies that compete with the tariffed imports benefit — the tariff makes foreign competitors more expensive, allowing domestic producers to raise prices or gain market share. A US steel producer benefits from tariffs on imported steel because customers shift toward domestically produced steel to avoid the tariff.

Companies That Export

Tariffs often trigger retaliation. If the US imposes tariffs on Chinese goods, China may retaliate with tariffs on US agricultural exports, manufactured goods, or services. US companies that export heavily to the tariffed country face reduced demand and lower revenue. Trade wars create a web of retaliatory tariffs that can harm exporters across multiple industries.

Broad Market Impact

Major tariff announcements move the entire market because they create economic uncertainty. Businesses delay investment decisions when they can't predict future trade costs. Supply chain disruptions reduce efficiency. Consumer prices rise, potentially slowing spending. These aggregate effects reduce economic growth expectations, which pulls stock valuations lower.

Tariffs and Quality Investing

Wide-moat businesses are better positioned to navigate tariff disruptions than no-moat competitors. Companies with pricing power can pass tariff costs to customers without losing market share. Companies with diversified global supply chains can shift sourcing to avoid tariffs. Companies with strong domestic market positions may benefit as imported competition becomes more expensive.

The quality investor's approach to tariffs: don't try to predict trade policy (it's politically driven and unpredictable), but ensure your portfolio contains businesses with the pricing power, supply chain flexibility, and balance sheet strength to absorb tariff impacts without permanent damage to their competitive positions. Be cautious about assuming any company is fully tariff-proof. Even businesses with domestic supply chains face indirect effects when tariffs slow GDP growth or disrupt customer industries.