US Dollar Fundamentals (USD)
US dollar fundamentals rest on two roles: the dollar is a yield play when the Federal Reserve is tight, and in many panics it has been the asset everyone runs to. Reading the dollar means knowing which role is in charge, and remembering that the second is not guaranteed.
Why the dollar is different
The dollar sits on one side of most currency trades. It is the largest reserve currency by far: 56.7 percent of global foreign exchange reserves in the second quarter of 2026 (IMF COFER). For much of the market, a chart of a major pair is a view for or against the dollar.
A common rule of thumb is the dollar smile. The dollar tends to strengthen when the US outperforms and when the world panics, and to soften when growth is healthy and broad, and money rotates into higher-yielding currencies elsewhere.
The Federal Reserve sets the pace
The Federal Reserve aims for inflation of 2 percent over the longer run, measured by the PCE price index (Fed FAQ). The FOMC holds eight regularly scheduled meetings a year (FOMC calendar); each decision is on Fed Interest Rate Decision (FOMC).
The market trades the expected path, not today’s rate. The dollar can rally on a meeting where rates do not change, because the projections or the press conference move the expected path. The gap against each currency is on Interest rate differential by currency pair, after inflation on Real interest rates by currency, and the most traded pair on EUR/USD fundamentals.
The data that matters
- US Non-Farm Payrolls (NFP): the most watched US release; a strong labour market gives the Fed room to stay tight.
- US Inflation Rate (CPI): the first read each month on whether policy needs to stay restrictive.
- US PCE Price Index: the measure the Fed’s goal is defined on.
- US GDP Growth Rate (Third Estimate): whether the US is outgrowing its peers.
In each case the result against the forecast moves the dollar, not the number alone.
When the safe haven did not hold: April 2025
On 2 April 2025 the US announced a tariff on imports from all countries (White House fact sheet). Instead of rallying, the dollar fell: the ECB’s reference rate for EUR/USD rose from 1.0803 on 2 April to 1.1476 on 22 April (ECB).
When stress starts outside the US, the scramble for dollars has usually lifted the currency. When it starts in US policy and hits US assets directly, that support can fail.
Positioning
So much of the market trades through the dollar that its positioning can get crowded. The US dollar (Dollar Index) COT report tracks leveraged funds in the ICE US Dollar Index future. When most of the market is on one side, the trade can snap back as the crowd unwinds.
How to put it together
- Where is the Fed’s expected path heading?
- Which side of the smile are we on?
- What is the rate gap against the currency on the other side of the pair?
- Where is the stress coming from: abroad, or US policy?
The other side of the dollar’s most rate-sensitive pair is in Japanese Yen Fundamentals (JPY).