Inflation Rate After Fed Raised Federal Funds Rate: What Really Happened

Let me cut straight to the chase: inflation did eventually fall after the Fed started raising the federal funds rate, but it wasn’t instant, and the path was bumpy. I’ve been tracking this since early 2022, and what I saw surprised me. Conventional wisdom says “raise rates → kill inflation,” but the real story is messier.

The Immediate Impact: Did Inflation Drop Right Away?

If you check the month after the first hike in March 2022—CPI was running at 8.5% year-over-year. The very next month? 8.3%. A tiny dip. But then it went back up to 9.1% in June. That’s the opposite of what most people expected. The Fed hiked again in May, June, July… and inflation kept climbing for a bit.

Why? Because rate hikes work with a lag. Monetary policy is like a slow-acting medicine. The first dose doesn’t cure you overnight. I remember telling a friend in June 2022, “Don’t expect results until late 2023.” He didn’t believe me.

Historical Example: The 2022-2023 Rate Hike Cycle

Let’s look at the most recent and relevant case. From March 2022 to July 2023, the Fed raised the federal funds rate from near zero to 5.25-5.5%. Here’s what happened to headline CPI (data from Bureau of Labor Statistics):

See the delay? Inflation peaked after three rate hikes. Then it took about 12 months from the first hike to see CPI drop below 5%. And even then, core inflation remained sticky.

Why the Relationship Isn’t Always Straightforward

I’ve seen investors assume that every rate hike immediately cools the economy. That’s wrong. Several factors muddy the water:

• Supply-side shocks: In 2022, energy and food prices surged due to the Ukraine war. No interest rate can fix a wheat shortage.
• Rent and housing lags: Rent prices take 12-18 months to respond to higher rates. New lease data lags by months.
• Expectations: If businesses and consumers think inflation will stay high, they raise prices preemptively—this can offset rate hikes temporarily.
• Global demand: The Fed controls only US rates. Global demand can keep commodities hot.

Lag Effects: How Long Does It Take for Rate Hikes to Work?

In my analysis of post-1980 hiking cycles, the average lag from first rate hike to inflation peak is about 6-9 months, and from peak to target reduction can take 18-24 months. But that’s just a guideline. The 2022 cycle was unique because inflation was already high before the first hike.

One thing I keep emphasizing: don’t watch the first rate hike; watch the last one. The best indicator of future inflation direction is the rate plateau, not the ascent. When the Fed stops hiking and holds rates steady, that’s when the real disinflation begins.

Real-World Data: A Closer Look at CPI and Core Inflation

Headline CPI fell from 9.1% to 3.0% by June 2023. But core CPI (ex food and energy) stayed above 4% until late 2023. The Fed pays more attention to core because it’s less volatile. So even though “inflation rate” dropped dramatically, the underlying trend was stickier.

Here’s a funny thing I noticed: the Fed’s favorite inflation measure, the PCE price index, lagged even further. In July 2023, core PCE was still at 4.2% despite CPI at 3.0%. The gap is due to different weighting. So when you ask “what happened to inflation,” you need to specify which measure.

Common Mistakes Investors Make When Interpreting Rate Hikes

I’ve seen three big mistakes repeatedly:

1. Ignoring lag effects – They expect immediate results and sell stocks when inflation doesn’t drop.
2. Confusing nominal vs real rates – If inflation is 8% and the Fed funds rate is 3%, real rates are still negative. The Fed wasn’t actually restrictive until mid-2023 when real rates turned positive.
3. Stopping at headline numbers – They see CPI at 3% and think job done, ignoring that core services inflation was still running at 5%.

My personal rule: look at 3-month annualized core inflation. That gives a cleaner signal about momentum.

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