How Do Tariffs Affect the Dollar? Theory vs What Actually Happens

Macro Guide, 2026

By Ken Chigbo, Founder, KenMacro, UK macro desk.

Find Ken on X @realkenchigbo · YouTube @Realkenchigbo · MACRO MASTERY Discord

Updated 2026-06-08

The textbook case for a stronger dollar

Start with the clean theory, because it still drives a lot of first-reaction trading. A tariff raises the price of imported goods, so Americans buy fewer of them. Buying fewer foreign goods means less dollar selling to fund those purchases, and that lift in relative demand should support the currency. There is a second leg too. Tariffs feed straight into import prices, so they are inflationary at the margin, and higher inflation can mean higher-for-longer policy rates. A firmer rate path tends to pull capital toward dollar assets. Classic trade models add a tidy twist: a tariff can be partly offset by the currency appreciating, which leaves the trade balance roughly where it started. On paper, then, tariffs read as dollar-supportive through both the trade channel and the rates channel.

Why the dollar often falls instead

Reality has been messier, and the desk has watched it diverge from the textbook more than once. Large tariff announcements have at times landed alongside dollar weakness rather than strength. The reasons are not exotic. Tariffs tax the domestic economy too, denting US growth and confidence and putting the soft landing at risk. They invite retaliation, which threatens exporters and clouds the outlook. They can chip away at trust in US assets and the dollar’s reserve role, producing a ‘sell America’ reflex where Treasuries, equities and the currency wobble together. And if traders conclude the Fed will cut to cushion a growth shock, the rate advantage that was meant to support the dollar shrinks. During the 2025 escalations, several of these channels fired at once and the dollar softened on the headlines, the opposite of the simple model.

Inflation channel versus growth channel

The cleanest way to read tariff days is to ask which story the market is buying. When attention sits on the inflation and rates channel, tariffs look dollar-positive: higher import prices, stickier inflation, a Fed kept on hold or pushed to stay restrictive, and yields that defend the currency. When attention shifts to the growth and confidence channel, the same headline reads dollar-negative: weaker activity, retaliation risk, a Fed expected to ease, and capital that questions whether US assets deserve their premium. These two readings can flip within a single session as fresh details land. The desk does not assume tariffs are mechanically bullish for the dollar. We watch front-end rates, equity risk appetite and the tone around retaliation to judge which channel is in control before committing to a direction.

Reserve status and the confidence premium

There is a slower-moving force underneath the day-to-day moves, and it matters for anyone holding dollar views across weeks rather than hours. The dollar carries a confidence premium tied to the trust foreign investors place in US institutions, US assets and the rule of law that underpins them. Aggressive, unpredictable trade policy can nick that premium. If overseas holders begin to diversify reserves or hedge their dollar exposure more heavily, the currency can grind softer even when growth and rate differentials look supportive on paper. This is the channel that turns a trade story into a capital-flows story. It rarely shows up in one print, but it can cap dollar rallies and deepen selloffs. The desk treats any sustained questioning of reserve status as a structurally bearish overlay on the dollar.

The verdict: direction is not fixed

Pull the threads together and the honest answer is that tariffs have no automatic effect on the dollar. The textbook says up; the tape often says down. Which wins depends on whether markets are pricing the inflation and rates channel or the growth, confidence and retaliation channel, and crucially on the Fed’s reaction function. Relative growth between the US and its trading partners matters, safe-haven flows matter, and the credibility of US policy matters. Anyone trading the dollar around tariff news with a fixed bias is fighting half the evidence. The skill is reading the regime in real time. Some weeks the dollar is the haven; other weeks it is the asset being sold. The desk sizes positions for that uncertainty rather than pretending the answer is settled.

The desk’s checklist

1. Identify the dominant channel. Before reacting to a tariff headline, decide whether the market is pricing inflation and rates (dollar-supportive) or growth, confidence and retaliation (dollar-negative). The same news flips direction depending on which story leads that day.
2. Read front-end rates first. Watch 2-year yields and Fed-cut pricing. If the market leans toward cuts to cushion growth, the dollar’s rate support fades. If it prices higher-for-longer on inflation, that defends the dollar.
3. Check the risk backdrop. Look at equities and credit alongside DXY. A ‘sell America’ day where stocks, Treasuries and the dollar fall together is a different trade from a clean risk-off bid into the dollar as a haven.
4. Track retaliation and scope. Gauge how broad the tariffs are and whether trading partners are answering back. Wider scope and credible retaliation tilt the balance toward the growth-damage reading and a softer dollar.
5. Map the cross, not just DXY. Decide which currency sits on the other side. A tariff aimed at one bloc can move EUR or CNH more than the broad index, so the cleanest expression may not be DXY itself.
6. Size for two-way risk. Because direction is regime-dependent, keep position sizing modest into the headline and add only once the channel that is leading becomes clear from rates and risk appetite. Avoid a fixed dollar bias.

Frequently asked

Do tariffs make the dollar go up or down?

Either is possible. The textbook says up, because fewer imports mean less dollar selling and tariff-driven inflation can keep rates high. In practice the dollar has often fallen after big tariff rounds, as markets price weaker US growth, retaliation, eroding confidence in US assets and a Fed expected to cut. The net direction depends on which channel leads.

Why would tariffs ever weaken the dollar if they reduce imports?

Because tariffs also tax the domestic economy. They slow US growth, invite retaliation against exporters, and can dent trust in US assets and the dollar’s reserve role. If traders expect the Fed to cut to offset the growth hit, the rate support behind the dollar shrinks, and the currency can soften despite the import effect.

Aren’t tariffs inflationary, and isn’t that dollar-positive?

Tariffs do lift import prices, which is inflationary at the margin and can support the dollar through higher-for-longer rates. But that only helps if the market believes the Fed will hold or tighten. If the growth shock is seen as larger than the inflation bump, the market may price cuts instead, and the inflation channel loses out to the growth channel.

What is the ‘sell America’ reaction?

It is a session where US Treasuries, equities and the dollar all weaken together as foreign investors question the safety and premium of US assets. It runs opposite to the usual haven reflex, where stress sends money into the dollar. Aggressive, unpredictable trade policy is one trigger for it, and it can cap dollar rallies.

Does tariff policy threaten the dollar’s reserve status?

One round of tariffs will not unseat the dollar. The risk is slower: sustained, unpredictable policy can erode the confidence premium that overseas holders place in US assets. If reserve managers diversify or hedge dollar exposure more heavily over time, that can weigh on the currency and cap rallies even when rate differentials look supportive.

How does the desk trade the dollar around tariff news?

We do not assume tariffs are automatically dollar-bullish. We read whether the market is pricing the inflation and rates channel or the growth and confidence channel that day, watch front-end yields and risk appetite to judge which is in control, then size for two-way risk rather than committing to a fixed direction before the regime is clear.

Educational analysis only, not financial advice. KenMacro has commercial partnerships with some firms referenced and may earn a commission if you open an account, at no cost to you. Manage risk against your own circumstances.