# How Tariffs Affect the Stock Market, Sector by Sector

Source: https://cluenex.com/learn/markets/tariffs-stock-market-sectors/
Publisher: Cluenex (https://cluenex.com)
Updated: 2026-10-15

## Short answer

Tariffs are taxes on imports. They hurt stocks mainly by raising costs for companies that import parts or goods, and by inviting retaliation against exporters. Hardware, retail, autos and low-margin importers are most exposed; domestic services and utilities least. Protected domestic producers can gain.

## Key takeaways

- A tariff hits a company's profit by: tariff rate x share of costs that are imported and tariffed. A 25% tariff on parts that are 30% of costs adds about 7.5% to total costs.
- Exposure differs by sector: importers and manufacturers with Asian supply chains are most exposed, domestic service businesses and regulated utilities least, and protected domestic producers may benefit.
- Retaliation matters as much as import costs: exporters such as farmers and aircraft makers can lose sales abroad.
- Gross margin trends in quarterly reports show whether a company is absorbing tariff costs or passing them to customers.
- Markets price the odds of tariff changes, so stock moves often come before the tariff takes effect and can reverse on a deal.

## What is a tariff and how does it reach a stock price?

A tariff is a tax a government charges on imported goods, usually paid by the importing company when the goods cross the border. That company then either absorbs the cost, which lowers profit, or raises prices, which can lower sales.

The key question for any stock is simple: how much of this company's costs or revenue crosses a border? A business that sources and sells inside the US is barely touched. A company that assembles products abroad and sells them here pays directly. An exporter can be hit when other countries respond with their own tariffs.

In the US, the importer of record pays the tariff at the border, not the foreign seller. Research on the 2018 and 2019 tariffs by Amiti, Redding and Weinstein at the New York Fed found that the cost was passed almost completely through to US buyers, not absorbed by foreign exporters. That is why US importers and their customers feel it.

## What are the four ways tariffs hit companies?

Tariffs reach profits through four channels: higher input costs, retaliation, currency moves and the cost of rebuilding supply chains.

**1. Input costs.** A company pays more for tariffed parts or goods right away, although inventory bought earlier can delay the effect by a quarter or two.

**2. Retaliation.** Trading partners answer with tariffs on US exports. In 2018 China targeted US soybeans, and the US government paid farmers support money to offset the losses.

**3. Currency.** An exporting country's currency may weaken, which partly offsets the tariff for its sellers. This is slow and unreliable, so it is not a safe cushion.

**4. Supply chain changes.** Moving production to another country costs money and takes years. Apple has publicly said it is shifting some assembly to India and Vietnam; the transition has costs even if the end result is safer.

## How do you calculate the damage to a company's margins?

Multiply the tariff rate by the share of costs that is tariffed. The result is the rise in total cost if nothing else changes.

Example with made-up numbers: a company sells a gadget for $100 and its total cost is $90, so profit is $10. Parts from a tariffed country cost $40, and a 25% tariff applies. The extra cost is $40 x 0.25 = $10. Profit falls from $10 to $0 unless the company raises the price or finds cheaper parts.

That is why a headline tariff rate alone says little. A thin-margin retailer can be wiped out by a tariff that a high-margin software-heavy company would barely notice.

## Which sectors are most and least exposed?

Exposure depends on imports, margins and pricing power, not on the sector label alone. This table is a rough guide, not a forecast.

| Sector | Typical exposure | Why |
|---|---|---|
| Technology hardware | High | Parts and assembly often cross Asian borders |
| Retail and apparel | High | Much of the inventory is imported, margins are thin |
| Autos and parts | High | Parts cross US, Mexico and Canada borders several times |
| Industrials that use steel or aluminum | Medium to high | Metal tariffs raise input costs |
| Agriculture and aerospace exporters | Medium | Retaliation can cut foreign sales |
| Domestic metal producers | Possible benefit | Less import competition |
| Healthcare | Low to medium | Some imported ingredients, mostly domestic services |
| Utilities and domestic services | Low | Little cross-border trade |
| Software | Low direct | Few physical goods, though customers' budgets can shrink |

A useful check is gross margin, the share of sales left after the direct cost of making the product. Higher margins give more room to absorb a cost shock. Current sector medians from Cluenex Data: 40.6% (Cluenex data, https://cluenex.com/learn/data/sector-benchmarks/), 33.8% (Cluenex data, https://cluenex.com/learn/data/sector-benchmarks/) and 61.5% (Cluenex data, https://cluenex.com/learn/data/sector-benchmarks/). A sector median hides wide gaps between companies, so compare a firm with its own industry.

## What happened to stocks in the 2018 to 2019 US-China trade war?

Stocks fell and rose in swings tied to tariff news, and the effect was uneven across sectors. The S&P 500 fell sharply in the fourth quarter of 2018, ending the year down about 6.2% on a price basis, but tariffs were only one cause alongside Federal Reserve rate increases and slowing growth.

That is the lesson: it is hard to pin a market move on tariffs alone. Escalations in May 2019 and August 2019 brought sharp drops, and truce headlines brought rebounds. The phase one trade agreement was signed in January 2020.

For a deeper look at how prices react to expected outcomes, see [why markets price probability, not headlines](/learn/markets/markets-price-probability-not-headlines/).

## How fast do tariffs show up in earnings?

Usually within one to three quarters. Inventory bought before the tariff must sell through first, and then higher-cost replacements arrive.

Stock prices often move sooner, when a company cuts its outlook or management warns about costs on an earnings call. Watch gross margin and guidance in the quarterly report. Our guide to [revenue guidance](/learn/fundamental-analysis/revenue-guidance/) explains why those updates move prices so much.

## When does this framework fail?

The framework works as a map of exposure, but it is a poor predictor of timing and size.

- **Policy changes fast.** Rates, exemptions and deals can change within days, so a number that is right today may be wrong next month.
- **Indirect effects are hard to see.** A domestic company can still suffer if its customers or suppliers are exposed.
- **Companies adapt.** Some stockpile ahead of a tariff, reroute shipments or raise prices without losing sales.
- **Other forces dominate.** Interest rates, earnings growth and the economy often matter more than tariffs in a given quarter.
- **Protected producers are not safe bets.** Higher prices from protection can invite more supply or weaker demand.

## What are common mistakes about tariffs and stocks?

**Assuming tariffs hurt every stock.** Domestic producers that compete with imports can gain while their customers pay more.

**Judging by the headline rate.** A 25% tariff on 5% of costs is small; a 10% tariff on 60% of costs is large. Use the formula above.

**Treating a relocation announcement as a fix.** Moving supply chains takes years and costs money first.

**Forgetting retaliation.** Exporters can lose sales even if they import nothing.

## What this means for you

You do not need to predict tariff policy. You need to know how much of your holdings depends on cross-border trade.

1. **List your holdings and read the risk section** of each annual report (see [how to read a 10-K](/learn/fundamental-analysis/10k-filing-explained/)). Companies often state their share of imported goods and sales by country.
2. **Estimate exposure** with the formula: tariff rate x tariffed share of costs, compared with the company's profit margin.
3. **Track gross margin** over several quarters. A steady fall while sales hold up suggests costs are being absorbed.
4. **Check concentration.** If several holdings share one supply chain, such as Asian electronics assembly, tariffs hit them together. See [how to diversify a stock portfolio](/learn/portfolio-management/portfolio-diversification/).
5. **Avoid trading on headlines.** Prices often react before you can, and deals can reverse moves overnight.

On Cluenex, each stock has a free public page at cluenex.com/stocks/ with business quality, the main risk and insider activity, which can help you see how a company's profitability compares with its own industry. Cluenex does not forecast tariff outcomes.

## Questions people ask

### Do tariffs make stock prices go down?

Not always. They tend to hurt companies that import parts or goods or sell abroad, while some domestic producers that compete with imports can benefit. The overall market effect depends on how large and how widespread the tariffs are, and on what else is happening in the economy.

### Who actually pays a tariff?

The importing company pays the tax at the border. Studies of the 2018 and 2019 US tariffs, including New York Fed research, found most of the cost passed through to US buyers rather than foreign exporters.

### Which sectors are least affected by tariffs?

Utilities, domestic service businesses and software usually have the least direct exposure because they import few physical goods. They can still be affected indirectly if tariffs slow the economy or hurt their customers.

### How do tariffs affect inflation?

Tariffs raise prices on affected goods, which can lift measured inflation if they are broad and companies pass the costs on. A one-time price level jump is different from continuing inflation, and the size depends on the tariffs and on how much companies absorb.

### Should I sell stocks when tariffs are announced?

Selling on headlines is risky because tariffs often change, get exempted or are traded away in deals, and prices tend to move before you can act. A better habit is to check each holding's exposure and margin cushion ahead of time.

## Sources

- [The Impact of the 2018 Tariffs on Prices and Welfare (Amiti, Redding, Weinstein)](https://www.newyorkfed.org/research/staff_reports/sr935)
- [Section 301 Investigation: China, Trade Actions](https://ustr.gov/issue-areas/enforcement/section-301-investigations/tariff-actions)
- [Economic and Trade Agreement Between the United States and China (Phase One)](https://ustr.gov/phase-one)
- [Apple Form 10-K (annual report) filings](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000320193&type=10-K)

Cite as: Cluenex. "How Tariffs Affect the Stock Market, Sector by Sector." Cluenex Learn, updated Oct 15, 2026. https://cluenex.com/learn/markets/tariffs-stock-market-sectors/