Trading CPI releases: headline vs core inflation in the US, euro area and UK

A consumer price index (CPI) release tells the market how fast prices rose in the previous month, and currencies react because inflation decides what central banks do with interest rates. In the US the Bureau of Labor Statistics publishes CPI at 08:30 New York time around the middle of the month; in the UK the Office for National Statistics publishes at 07:00 UK time, also mid-month; in the euro area Eurostat publishes a flash estimate of HICP inflation at the end of the month or on the first working days of the next. In each case markets focus on core inflation and on the monthly change, and react to the difference between the actual figure and the consensus forecast.

This guide builds on how economic data moves forex, which covers CPI alongside jobs, growth and survey data, and on inflation and currencies, which explains the economics. Here the focus is the release itself: what is in it, how to read it quickly, and what tends to happen to prices and trading conditions around it.

Why inflation data moves currencies

The main central banks all target inflation, at or around 2%. When inflation runs above target, they tend to keep rates higher for longer or raise them; when it falls back, they have room to cut. Currency markets price those rate paths in advance, so anything that changes the expected path changes the exchange rate. A hotter-than-expected CPI print generally pushes expectations towards higher rates, which tends to support the currency, and a softer print does the reverse, all else being equal. The central banks and interest rates guide explains the transmission in detail.

"All else being equal" carries weight. If high inflation is seen as hurting growth, or if the central bank is seen as behind the curve, the reaction can be muddier. And in currency pairs, the other side matters: a hot US CPI moves EUR/USD because it changes the expected gap between US and euro area rates, which is why the interest rate differential is the more useful lens than the US number alone.

Headline and core

Every CPI release contains several measures. The two that matter most:

• Headline inflation covers the whole basket: food, energy, goods, services, housing costs.
• Core inflation strips out the most volatile components. In the US, core CPI excludes food and energy. In the euro area, the commonly quoted core measure excludes energy, food, alcohol and tobacco. In the UK, core CPI excludes energy, food, alcohol and tobacco as well.

Energy and food prices swing with oil markets, the weather and global events, which central banks cannot do much about with interest rates. Core inflation is a better guide to the underlying trend that policy can affect, so it usually drives the market reaction. If headline inflation surprises lower because petrol prices fell but core comes in above expectations, the core number tends to win.

Services inflation

Within core, services inflation has received particular attention from central banks in recent years, because it is closely tied to wages and tends to be persistent. The Bank of England has repeatedly highlighted UK services CPI in its communications, and the ECB discusses euro area services inflation in its statements. In the US, housing costs (shelter) are the largest single component of core CPI and change slowly, so markets often look at core services excluding shelter as well. You do not need to track every sub-index, but if commentary before the release says "the market is watching services", that is the line to read first.

CPI versus PCE in the US

The Federal Reserve defines its 2% goal using the personal consumption expenditures (PCE) price index, published later in the month by the Bureau of Economic Analysis, not CPI. CPI usually gets the bigger market reaction anyway, because it arrives first, and much of the PCE figure can be estimated from CPI and producer price data once they are out. By the time PCE is published, analysts have often narrowed down what it will show.

Monthly versus annual rates

A CPI release gives both a month-on-month change and a year-on-year change. Headlines quote the annual rate. Markets often care more about the monthly one, because it shows the current pace.

Worked example: why 0.1 matters

Illustrative numbers. Consensus for core CPI is +0.3% month on month. The actual is +0.4%.

• 0.3% a month, compounded over twelve months, is about 3.7% a year.
• 0.4% a month, compounded over twelve months, is about 4.9% a year.

A miss that looks tiny on the screen implies a pace of inflation more than a full percentage point faster if it were sustained. One month is not a trend, and markets know that, but that is why a 0.1 point surprise in the monthly core number can be a big market event.

Rounding

Figures are published rounded to one decimal place. An unrounded monthly rise of 0.34% shows as 0.3%; one of 0.35% shows as 0.4%. Before major releases, analysts sometimes publish their unrounded estimates, and after the release the unrounded number can be calculated from the index levels. A "0.3% in line with expectations" can in fact be a high 0.3% that the market treats as a mild upside surprise. This is one reason the reaction does not always match the rounded headline.

Worked example: base effects

The annual rate compares this month's index level with the level twelve months earlier. That means it depends on what happened a year ago as well as what is happening now.

Illustrative numbers. Suppose that a year ago there was a one-off monthly jump of 0.8%, perhaps from an energy price spike, and every month since then has risen by 0.2%. Compounded, the twelve months including the 0.8% month give an annual rate of about 3.0%. Next month, the 0.8% month drops out of the twelve-month window and is replaced by another 0.2% month. The annual rate falls to about 2.4%, a drop of about 0.6 points, without anything changing in the current trend.

Economists and calendars flag base effects in advance, so a large fall in annual inflation for this reason is usually expected. The point for a trader is that the annual figure alone can mislead; the monthly figure tells you whether the pace has changed.

The three releases forex traders watch most

United States

• Publisher: the Bureau of Labor Statistics.
• Timing: 08:30 New York time, usually in the second or third week of the month, for the previous month. That is 13:30 London and 14:30 CET for most of the year, an hour earlier for Europeans during the daylight-saving gap weeks.
• Key lines: headline and core, monthly and annual, plus shelter, services and goods components.
• 2027 dates from the BLS schedule: 13 January, 11 February, 10 March, 13 April, 12 May and 10 June for the first half. Our quarterly calendars list later dates and the meetings they precede.
• Disruptions: like the jobs report, CPI is not published during a federal government shutdown. The BLS cancelled the October 2025 CPI release after that autumn's shutdown, publishing what it could with the November data.

Because the dollar sits on one side of most trades, US CPI moves dollar pairs, gold and US index CFDs at the same time.

Euro area

• Publisher: Eurostat, the EU's statistical office, using the Harmonised Index of Consumer Prices (HICP), which is the measure the ECB targets.
• Timing: a flash estimate at 11:00 CET around the last working day of the month or the first working days of the next month, followed by a final figure around the middle of the following month. The final figure rarely differs much from the flash, so the flash is the market event.
• Previews: the big member states publish their own flash figures earlier, often a day or two before or on the same morning: Spain, France, Germany (with figures from several German states ahead of the national number) and Italy. By the time the euro area flash arrives, much of it can be estimated from these, so the euro area release often moves the euro less than the national releases, especially Germany's.
• Key lines: headline, core (excluding energy, food, alcohol and tobacco) and services.

The euro explainer covers why a single central bank for many economies makes euro area inflation data a slightly different animal.

United Kingdom

• Publisher: the Office for National Statistics.
• Timing: 07:00 UK time, often on a Wednesday around the middle of the month, for the previous month. That is before the London open for most participants, so the reaction happens in thinner early-morning liquidity.
• Key lines: CPI headline, core and services. The ONS also publishes CPIH, which includes owner-occupiers' housing costs and is its preferred measure, but the Bank of England's 2% target is defined on CPI, and CPI is what moves sterling.
• Context: if UK CPI is more than one percentage point away from the target, the Governor writes an open letter to the Chancellor explaining why.

The UK release is a notable one for GBP/USD and EUR/GBP, and is covered in the sterling explainer.

Others

Japan's Tokyo CPI, published about three weeks before the national figure, is watched as an early read on Japanese inflation, which has mattered more for the yen since the Bank of Japan began raising rates in 2024. Canada, Australia and New Zealand all publish CPI data that moves their currencies; see our quarterly calendars for the timing rules.

How the reaction tends to unfold

The pattern is similar to other top-tier releases, with a few specifics:

1. Before the release, spreads widen and liquidity thins. Short-dated interest rate futures and two-year government bond yields are where expectations are expressed most directly; currencies follow.
2. In the first seconds, algorithms react to the headline and core monthly numbers. Prices can jump several times the normal one-minute range, and stop orders can fill well beyond their levels. The slippage guide explains why.
3. In the next minutes, the market reads the detail: whether the surprise came from volatile components (airfares, used cars and energy have all played that role in US data) or from broad-based services. A surprise from one volatile item can fade; a broad one tends to stick.
4. Over the following hours and days, the release is absorbed into expectations for the next central bank meeting. A CPI print the week before a decision can move pricing for that meeting meaningfully, which is part of why the FOMC meetings guide and the ECB and BoE meetings guide both mention the data that precedes each decision.

Nothing in this sequence tells you the direction in advance, and positioning matters: if the market expected an upside surprise and was already long the currency, an in-line number can produce a fall.

Worked example: a conflicting report

Illustrative only. Consensus for US CPI: headline +0.2% month on month, core +0.3%. Actual: headline +0.1%, core +0.4%.

• The headline looks soft, and the first algorithmic reaction might sell the dollar.
• Core is a 0.1 point upside surprise, and if the detail shows it came from services rather than a one-off item, the market may conclude that the underlying pace has picked up.
• Within minutes, the dollar could reverse higher as rate expectations rise.

A trader who placed a stop order to catch the first move may be filled near the low, with slippage, and then stopped out on the reversal. This is the most common way CPI hurts retail traders: not being wrong about inflation, but paying the widest spreads of the day on both sides of a whipsaw.

Managing risk on CPI days

• Know the time. Check it in your own time zone, especially for the UK release at 07:00 UK time and in daylight-saving gap weeks. The market hours tool helps.
• Check for clusters. In 2027, for example, US CPI on 10 June comes 15 minutes after the ECB decision. Two high-impact events close together can compound spread widening.
• Resize, do not just widen. If you hold a position through the release, a wider stop needs a smaller position to keep the money at risk constant. The position size calculator does the arithmetic.
• Allow for slippage. Assume a stop can fill worse than its level during the release and size so that would still be acceptable.
• Consider waiting. Trading after the first reaction, once spreads have normalised, gives up the initial move for normal costs and more information.

CFDs on currency pairs are leveraged products and most retail accounts lose money; leverage magnifies losses in exactly these fast markets. See the risk warning and the news trading risks guide.

Common mistakes

• Reading only the headline. Core, services and the monthly rate usually matter more.
• Ignoring base effects. A falling annual rate can coexist with a fast monthly pace.
• Treating 0.1 as noise. In monthly core inflation, 0.1 points is a meaningful surprise.
• Forgetting the national euro area releases. By the time Eurostat publishes, Spanish, French, German and Italian figures have already moved expectations.
• Getting the UK time wrong. 07:00 UK time is early; a European trader who assumes a midday release can be caught out.
• Expecting the same reaction every time. What the market focuses on, and how it is positioned, changes over time.
• Holding normal size through the release. Spreads and slippage around CPI are not normal conditions.

Frequently asked questions

What time is US CPI released?

At 08:30 New York time, usually in the second or third week of the month, by the Bureau of Labor Statistics. That is 13:30 London and 14:30 Central European Time for most of the year, an hour earlier for Europeans during the weeks in spring and autumn when US and European clocks are out of step.

What is the difference between headline and core CPI?

Headline CPI includes everything in the basket. Core CPI removes the most volatile components, food and energy in the US definition and energy, food, alcohol and tobacco in the common euro area and UK measures, to show the underlying trend. Central banks and markets generally focus on core.

Does higher inflation make a currency stronger or weaker?

In the short run, a higher-than-expected print often supports a currency, because it raises the chance of higher interest rates. Over longer periods, persistently high inflation erodes a currency's purchasing power. The short-run reaction also depends on whether the market thinks the central bank will respond, and on what was already priced.

Why does the euro sometimes barely move on euro area CPI?

Because the big member states publish their own flash figures first, so much of the euro area number can be estimated before Eurostat releases it. The German figures in particular often move the euro more than the euro area release itself.

What is a base effect?

The annual inflation rate compares prices with twelve months earlier, so an unusual price jump or fall a year ago affects today's annual figure. When a big month from a year ago drops out of the comparison, the annual rate can fall sharply even if prices are still rising at the same pace.

Is it worth trading CPI releases?

That is a personal decision. What is generally true is that spreads widen, slippage is more likely and price can whip both ways in the first minutes, which works against slower retail participants. Many traders avoid opening positions just before the release and wait for conditions to normalise.