Fed Decision Day: Why Tomorrow’s Rate Move Matters Less Than You Think

Tomorrow marks the end of this month’s Fed meeting, and the market is laser-focused on one number. But before you brace for a mortgage rate swing, let’s talk about what’s actually likely to happen and why the Fed’s decision isn’t the lever you think it is.

The Three Options

The Fed has three paths tomorrow: hike, hold, or cut. Prediction markets are heavily favoring a hike right now. But “widely expected” isn’t universally expected, and there’s a real case to be made for a hold too. Here’s the thing most people miss: it may not matter as much as the headlines suggest.

What the Fed Funds Rate Actually Is

A lot of people assume the Fed sets “the” interest rate we all borrow at. It doesn’t. The federal funds rate is a cap on what banks charge each other for overnight loans, right now that range sits at 3.50%–3.75%. If a bank needs cash and its neighbor wants too much for it, it can go to the Fed instead, capped at that top number. That’s it. It’s a plumbing mechanism for the banking system, not a dial connected directly to your mortgage rate.

So Why Do Mortgage Rates Move at All?

Mortgage rates trend with inflation, not with the fed funds rate itself. Here’s the chain: when the Fed raises rates, it becomes more expensive for banks to borrow from each other and from the Fed. That pulls dollars out of circulation, which in theory cools inflation. Investors watch this and adjust their behavior: if they believe the Fed is serious about fighting inflation, they’ll buy up Treasuries and mortgage-backed securities now, while yields are still high, before those yields fall. That buying pressure is what actually moves mortgage rates not the Fed’s announcement itself.

In other words: it’s not the Fed deciding your mortgage rate. It’s traders and investors deciding where to put their money based on what they think the Fed’s move signals about the future.

What the Data Actually Shows

Last week’s inflation numbers give useful context:

• Core CPI (year-over-year, excludes food and energy): 2.4%
• Headline CPI (year-over-year, includes everything): 3.4%
• Core CPI (month-over-month, the number that carries the most weight with investors): 0.3%

That gap between core and headline is the story. Strip out energy and food, and inflation is trending in a good direction. The wider gap is coming from somewhere specific — oil.

The Oil Wrinkle

This is the piece we think gets overlooked. Current oil prices are elevated because of an overseas conflict disrupting supply not because of excess dollars sloshing around the economy the way we saw in 2022–2023 after pandemic-era stimulus. That distinction matters enormously, because the Fed funds rate has zero effect on an oil supply shock. The Fed could hike a full point or cut to zero tomorrow, and neither move touches the actual driver of headline inflation right now. That resolves when the conflict resolves not when the Fed acts.

We’ve Seen This Movie Before

Rewind to September 2024: rates had been falling for months heading into the Fed’s 50-basis-point cut. Conventional wisdom said rates would keep falling. Instead, they immediately spiked afterward. The cut wasn’t the start of a decline, it marked the bottom. Why? Because the market was pricing in continued inflation fighting, and the focus shifted to worrying jobs numbers. It’s a reminder that the market’s reaction to a Fed decision often has more to do with expectations and interpretation than with the decision itself.

Our Take

We think either a hold or a modest hike is fine for mortgage rates in the near term, the disinflationary trend outside of oil is still intact, and either outcome is consistent with that. What would actually rattle the market is a surprise: something outside the expected quarter-point move, like a full 50-basis-point hike. That would signal something has changed and could shock rates in a way a routine move won’t.

The bottom line: don’t watch the Fed decision itself. Watch what investors do with it. That’s where mortgage rates actually get made.