Why Mortgage Rates Don't Fall When the Fed Cuts Rates

The Federal Reserve has cut the federal funds rate by 175 basis points since September 2024, bringing it from 5.50% down to a target range of 3.50% to 3.75%. Borrowers with variable-rate products have seen every basis point of relief. But the 30-year fixed mortgage rate has barely budged, sitting at 6.22% compared to roughly 6.35% when the cutting cycle began. The reason is structural: fixed-rate mortgages do not track the fed funds rate. They track the 10-year Treasury yield, which has moved in the opposite direction of the Fed, rising 67 basis points over the same period. Add an elevated mortgage-Treasury spread, and the result is a fixed-rate market that has largely ignored 18 months of monetary easing.

• Fed Funds Rate: Down 175 bps (5.50% to 3.75%) since September 2024
• 30-Year Fixed Mortgage: Down roughly 13 bps (6.35% to 6.22%), barely changed
• 10-Year Treasury: Up 67 bps (3.72% to 4.39%), moving against the Fed
• Prime Rate: Down 175 bps (8.50% to 6.75%), tracking the Fed exactly

Two Benchmarks, Two Directions

The confusion starts with a single assumption: that the Federal Reserve controls mortgage rates. It does not. The Fed sets the federal funds rate, which is the overnight lending rate between banks. Products tied to that rate, or to the Prime Rate (which moves in lockstep with it), respond immediately when the Fed acts. Home equity lines of credit are the clearest example. When the Fed cut 175 basis points, HELOC rates dropped 175 basis points. Adjustable-rate mortgages during their adjustment periods follow the same logic, resetting to a new index value that reflects the lower short-term rate.

Fixed-rate mortgages operate on a completely different mechanism. Lenders price 30-year fixed loans off the yield on 10-year U.S. Treasury notes, not the fed funds rate. The 10-year yield is set by the bond market, not by the Federal Reserve, and it reflects expectations about inflation, economic growth, government borrowing, and the term premium investors demand for holding long-duration debt. The Fed influences these expectations indirectly, but it cannot dictate them.

The result since September 2024 has been a dramatic divergence. The table below shows how variable-rate benchmarks have fallen in step with the Fed, while long-term benchmarks have risen.

Why did the 10-year Treasury rise while the Fed was cutting? Several forces pushed in that direction. Inflation expectations, while moderating from 2022 peaks, remained sticky enough to keep bond investors cautious. Federal government borrowing continued at historically elevated levels, increasing Treasury supply. And the term premium, the extra yield investors demand for holding long-term bonds instead of rolling over short-term ones, increased as uncertainty about the fiscal trajectory grew. The Fed's rate cuts may eventually pull long-term yields lower if the economy slows meaningfully, but that transmission is indirect and slow.

The chart below shows the divergence in real time. The fed funds target rate (upper bound) has stepped down five times since September 2024, while the 10-year Treasury yield has risen, particularly in late 2024 and early 2025.

The key takeaway from this divergence: borrowers with adjustable-rate mortgages during their adjustment periods and those holding HELOCs have received the full benefit of the Fed's easing. Borrowers seeking a new 30-year fixed mortgage have not. Until the 10-year Treasury yield declines, fixed mortgage rates will remain elevated regardless of what the Fed does with short-term rates.

The Spread: Why Mortgages Cost More Than Treasuries

Even if the 10-year Treasury yield were the only factor, mortgage rates would still be higher than Treasury yields. Lenders do not lend at the Treasury rate; they add a spread to compensate for the additional risks of mortgage lending. This mortgage-Treasury spread is the second structural reason why mortgage rates have not followed the Fed downward.

The spread exists because mortgage-backed securities (MBS), the instruments that fund most U.S. home loans, carry risks that Treasury bonds do not. Three risks dominate. First, prepayment risk: when rates fall, borrowers refinance, returning principal to investors earlier than expected and forcing them to reinvest at lower yields. Second, credit risk: while agency MBS carry a government guarantee, the operational costs of defaults, forbearance, and servicing add friction. Third, liquidity risk: Treasuries are the most liquid securities on earth; MBS trade with wider bid-ask spreads and less predictable cash flows.

The historical average spread between the 30-year fixed mortgage rate and the 10-year Treasury yield is approximately 170 basis points. As of March 19, 2026, the spread sits at 183 basis points, roughly 13 basis points above the long-run average. That 13-basis-point premium may sound small, but it translates directly into higher monthly payments for every borrower in the country. If the spread were at its historical average, today's 30-year fixed rate would be approximately 6.09% instead of 6.22%.

The spread widened sharply in 2022 and 2023 as the Fed aggressively raised rates and began reducing its MBS holdings (quantitative tightening). It has narrowed since then but has not returned to the pre-pandemic norm of roughly 160-170 basis points. The table below shows the spread at key moments during the current cycle and the forces influencing it at each stage.

The spread compression from 291 bps at the October 2023 peak to 183 bps today has been the single largest contributor to any mortgage rate relief borrowers have experienced. It accounts for more rate improvement than the Fed's actual rate cuts, which passed through to variable-rate products but not directly to fixed-rate loans. Further spread compression toward the 170-basis-point average would reduce rates by an additional 13 bps even without any change in Treasury yields.

Putting the Two Forces Together

The mortgage rate a borrower pays is the sum of two components: the 10-year Treasury yield plus the mortgage-Treasury spread. Both must decline for fixed rates to fall meaningfully. Since September 2024, these components have moved in offsetting directions. The spread has compressed (positive for borrowers), but the 10-year yield has risen (negative for borrowers). The net effect is a 30-year fixed rate that has barely changed despite 175 basis points of Fed cuts.

This framework explains why media headlines about Fed rate cuts often mislead borrowers. A 25-basis-point Fed cut does not translate into a 25-basis-point mortgage rate decline. It may translate into zero change, or even an increase, if Treasury yields rise on the same day due to a hawkish FOMC statement or unexpected inflation data. The March 18-19, 2026 FOMC meeting demonstrated this precisely: the Fed held rates steady, but the updated dot plot signaled fewer future cuts, pushing Treasury yields up 14 basis points and the 30-year fixed rate up 11 basis points in a single week.

For rates to reach the 5.7% to 5.8% range that Fannie Mae projects for late 2026, both components need to cooperate. The 10-year Treasury yield would need to fall from 4.39% to roughly 4.00%, and the spread would need to compress from 183 bps to the historical average of 170 bps. Neither is guaranteed. Treasury yields depend on inflation trajectory, fiscal policy, and global demand for U.S. debt. The spread depends on MBS market conditions, Fed balance sheet policy, and bank demand for mortgage bonds.

What This Means for Borrowers

HELOC holders and ARM borrowers during adjustment periods received every basis point of the Fed's 175-basis-point easing cycle. A HELOC that was priced at Prime plus 1% dropped from 9.50% to 7.75% since September 2024. That is real, immediate savings. Borrowers considering whether to draw on a HELOC versus taking a cash-out refinance should weigh the variable-rate advantage carefully, understanding that it persists only as long as the Fed maintains its lower rate posture.

For borrowers seeking a new 30-year fixed mortgage, the analysis is different. Waiting for Fed cuts to lower your fixed rate is not a reliable strategy. The path to lower fixed rates runs through Treasury yields and spread compression, not through the fed funds rate. Borrowers focused on rate locks should watch the 10-year Treasury yield and the mortgage-Treasury spread as leading indicators, not FOMC announcements.

Refinance candidates holding rates at 7% or above still have meaningful savings available at 6.22%. But the common hope that "the Fed will cut and I will refinance at 5%" overstates what Fed policy alone can deliver. Borrowers evaluating a rate buydown or waiting strategy should understand that fixed rates move on their own timeline, driven by forces the Fed influences indirectly rather than controls directly.

What Actually Moves Mortgage Rates

If the fed funds rate does not drive fixed mortgage rates, what does? Four factors determine where the 30-year fixed rate lands on any given week:

• 10-Year Treasury yield. The primary benchmark. When bond investors demand higher yields (due to inflation fears, fiscal concerns, or risk appetite shifts), mortgage rates rise. When yields fall, mortgage rates follow.
• Mortgage-Treasury spread. The premium above Treasuries that MBS investors require. Currently 183 basis points versus a 170-basis-point historical average. If the spread normalized today, the 30-year rate would drop from 6.22% to approximately 6.09% with no change in Treasury yields.
• Inflation expectations. Bond investors price future inflation into yields. Sticky inflation keeps yields elevated even when the Fed is cutting. The Fed influences expectations but cannot dictate them.
• MBS demand. Bank appetite for mortgage bonds, the Fed's balance sheet runoff (quantitative tightening), and foreign investor demand all affect how much spread investors require. When the Fed was buying MBS aggressively in 2020-2021, spreads compressed to historic lows. The reversal has kept spreads elevated.

Borrowers watching for rate direction should track the 10-year Treasury yield and the mortgage-Treasury spread as leading indicators. FOMC announcements matter for sentiment and for variable-rate products, but they do not directly set fixed mortgage rates.

Key Takeaways

• Fixed-rate mortgages track the 10-year Treasury yield, not the fed funds rate. Variable-rate products (HELOCs, ARMs during adjustment) track the Prime Rate, which moves in lockstep with the Fed. This structural difference is the primary reason Fed cuts have not lowered fixed mortgage rates.
• The Fed has cut 175 bps since September 2024. The Prime Rate fell 175 bps. The 10-year Treasury rose 67 bps. The 30-year fixed mortgage rate fell only about 13 bps.
• The mortgage-Treasury spread adds a layer of cost beyond what Treasury yields dictate. At 183 bps versus a 170-bps historical average, the elevated spread adds roughly 13 bps to mortgage rates.
• Spread compression from the October 2023 peak of 291 bps to today's 183 bps has delivered more rate relief than the Fed's actual rate cuts, which passed through to variable products but not to fixed-rate loans.
• For fixed rates to reach the 5.7%-5.8% range that forecasters project for late 2026, both the 10-year yield and the spread must decline. Neither is guaranteed, and both depend on forces the Fed influences indirectly.
• HELOC and ARM borrowers got the full benefit. Fixed-rate borrowers did not. Waiting for Fed cuts alone is not a reliable rate strategy.
• Watch the 10-year Treasury yield and the mortgage-Treasury spread as leading indicators. FOMC announcements matter for variable rates and for market sentiment, but they do not directly set fixed mortgage rates.