US CPI preview: MUFG sees the dollar index at 105 if September inflation runs hot

The dollar index sat near 102.24 on Wednesday morning, and its next move depends on a number that lands at 12:30 GMT: September's US consumer price index. MUFG's Derek Halpenny says an upside surprise could set off another sell-off in bonds and carry the greenback toward 105 — a level that would drag EUR/USD below 1.10.

DXY at 105. EUR/USD under 1.10. From 102.24 and 1.1196 this morning, that is a full repricing — not a nudge.

Consensus expects headline inflation of 3.6% year over year, up from 3.4% in August, with core CPI at 2.5% versus 2.4%. Energy is doing the heavy lifting on the headline; the underlying number is the one that decides what the Fed does next.

Halpenny's case starts with volatility, not prices. G10 currency swings have started to settle after a spike that tracked the jump in government bond yields, but MUFG thinks the risks still lean toward another round of turbulence. The reason is geopolitics. Escalating military conflict between the US and Iran sent Brent crude up more than 14% through September, above $100 a barrel for the first time since July, and US gasoline prices rose 7.1%, according to the Energy Information Administration. If energy shocks keep feeding into yields, the dollar has a second leg higher in it.

Why it matters

The dollar's CPI trade runs through the 2-year Treasury note, the market's purest read on Fed policy. It yielded 4.782% ahead of the data, down a basis point in Asian trading. A hot core number — say a second straight 0.3% monthly gain — would force traders to reprice the peak rate higher, push the 2-year up, and widen the rate gap between the dollar and everything else. That is the machinery behind MUFG's call: its 105 target comes straight out of its own 2-year yield projections, not a chart pattern.

The context around the Fed makes this CPI doubly loaded. The Fed lifted rates by 25 basis points in September, and the minutes of that meeting, released on October 7, showed most policymakers judging another increase likely before year-end. Money markets give October barely a one-in-five chance but price a December hike at roughly 68-70%.

Here is the asymmetry: a consensus print changes almost nothing. It would take something extreme — a 0.0% monthly core reading — to trigger a real dollar sell-off. A firm print, on the other hand, keeps December live and could even revive October odds. The downside for dollar bulls is narrow; the upside is open. Note the asymmetry MUFG flags: a consensus print changes almost nothing for rate expectations. It would take something extreme — a 0.0% monthly core reading — to trigger a real dollar sell-off. The downside for dollar bulls is narrow; the upside is open.

There is also a genuine upside-risk lobby forming. RSM's chief economist Joe Brusuelas has warned that rising oil prices give the September number "significant upside risk," and Goldman Sachs expects core CPI at 0.24% month over month — above the 0.2% consensus — for a 2.46% annual rate. If the surprise comes, it comes hot. Traders watching the yen should also note today's USD/JPY setup, since a hot CPI would work through the same rate-differential channel. The broader forex desk is tracking how the Middle East energy shock is repricing every central bank's path.