US Dollar buying is back in vogue, and capital continues to flow into the greenback – with the US looking somewhat ‘exceptional’ the US Dollar Index (DXY) has broken to year-to-date highs, and EURUSD has fallen to fresh 2026 lows.
The trend is compelling, the fundamentals remain supportive, and insto traders have shown little inclination to fade the move.
Yet with US September CPI released on Wednesday, 14 October, the dollar faces a significant test.
The question for FX traders?
Where is the skew in USD risk? Would an upside inflation surprise trigger a more aggressive USD rally than the sell-off we'd see from a downside miss?
My bias is that the risks favour further USD strength, although increasingly stretched positioning makes this far from a one-way trade.
US CPI: Is the risk skewed towards a stronger dollar?
Consensus expects September core CPI to rise 0.2% month-on-month, with annual inflation ticking up to 2.5% from 2.4%.
The Federal Reserve remains highly sensitive to inflation pressures and aggregate demand. That suggests an upside surprise could have a greater influence on policy expectations than a modest downside miss.
There are potential upside risks, notably consumer electronics repricing and volatile airfares, although both remain difficult to forecast.
Interest-rate markets currently imply a 18% probability of an October Fed hike, with December tightening fully priced.
More interesting is January 2027, where another hike carries an implied probability of approximately 39%.
A hot core CPI print could see traders increasingly price consecutive hikes in December and January, lifting Treasury yields and providing fresh fuel for USD bulls.
But there's a catch. Speculative dollar positioning is already stretched. While strong trends can sustain crowded positioning, a downside CPI surprise could trigger aggressive unwinding of USD longs.
The fundamental risk may favour dollar strength, but the positioning risk cuts both ways.
EURUSD breaks down as French fiscal risks intensify
EURUSD has been central to the dollar's breakout, trading to a year-to-date low near 1.1149.
But this isn't exclusively a dollar story. French fiscal concerns have pushed France’s 10-year OAT-Bund spread towards 143 basis points, reflecting mounting sovereign and political risk.
Should that spread widen beyond 150 basis points, EURUSD could face another leg lower towards 1.1000.
Elsewhere, NZDUSD is testing year-to-date lows, USDCHF is threatening a move towards 0.8400, and USDJPY is challenging recent highs.
The technical message is clear: dollar strength is broadening, with momentum attracting fresh capital.
Why the dollar rally is about more than the Fed
Several powerful forces are supporting the greenback.
- Relative growth: FX investors want growth - The US economy continues to outperform much of the G10, attracting capital towards higher-growth assets.
- Carry advantage: Long USD positions offer positive interest-rate carry against most G10 currencies, with AUD and NOK notable exceptions.
- Real yields: US 10-year inflation-adjusted Treasury yields have risen approximately 24 basis points over the past month, outperforming many G10 peers and strengthening the dollar's appeal.
- Relative future implied interest rate differentials: Markets are reassessing where US interest rates could peak relative to other central banks, with widening differentials reinforcing USD demand.
- Geopolitics: Elevated oil prices and geopolitical uncertainty provide another layer of support for the dollar.
This combination of growth, income, relative rates and momentum explains why the rally has been so persistent.
Trading US CPI: Momentum versus positioning
For traders, the reaction to CPI matters as much as the number itself.
A hot core inflation reading could extend the DXY breakout, accelerate EURUSD weakness and reinforce expectations for further Fed tightening.
An in-line print may leave the prevailing trend intact, while a meaningful downside surprise could trigger a sharp squeeze against crowded dollar longs.
The bigger question is whether any USD pullback attracts fresh buyers or develops into a genuine trend reversal.
For now, king dollar retains the upper hand. The technicals are strong, relative rates are supportive, and the macro backdrop continues to favour US assets.
But when positioning becomes crowded, even the strongest trends can experience violent corrections.
The trend remains the trader's friend, but Wednesday's CPI will test just how much good news is already in the price.
