Why Credit Card Rates React to the Fed Faster Than Mortgages Do

The Federal Reserve's benchmark rate has held at 3.50 to 3.75 percent through its last several meetings. Yet the average credit card carrying a balance charges more than 21 percent, the average new 30-year mortgage runs near 6.7 percent, and the best nationally advertised savings account pays around 4.15 percent. One policy rate, four very different numbers. The gap is not a pricing error. It is the transmission mechanism working the way central banks say it works, just at different speeds for different products.

A Single Overnight Rate Radiates Outward Through the Financial System

Central banks do not set the rate on your mortgage or your savings account directly. They set a target for the rate banks charge each other on overnight loans, the federal funds rate in the United States, the cash rate in Australia, the deposit facility rate in the euro area. The Reserve Bank of Australia describes this as a two-stage process in its public transmission explainer: policy settings first move interest rates across the economy, and those interest rates then move spending, saving, and prices. The European Central Bank's own explainer of the mechanism adds that the process also works through expectations, because a central bank credible enough to anchor expectations of price stability changes how households and firms plan even before any single rate resets.

The diagram below traces that path, from the policy decision through the four channels the RBA names in its explainer: saving and investment, cash flow, asset prices and wealth, and the exchange rate.

Credit Cards and Adjustable Loans Reprice Almost Immediately

The Wall Street Journal's prime rate, the benchmark most banks use to price variable-rate credit cards and home equity lines, sits at 6.75 percent, a spread of about three percentage points above the federal funds target that has held by banking convention for decades. When the Fed moves, prime typically moves within a day or two, and card issuers reprice within a billing cycle or two after that. That is why the average annual percentage rate on credit card accounts that carry a balance, 21.52 percent according to the Federal Reserve's own G.19 statistical release, tracks Fed policy closely even while sitting nearly 18 percentage points above it. Home equity loans move on a similar clock; the national average fixed rate on one recently stood at 7.35 percent.

This is the RBA's cash-flow channel in practice. A rate cut lowers monthly payments for anyone with variable-rate debt, freeing up cash to spend. It cuts the other way for savers: lower deposit rates reduce the return on cash sitting in the bank, which is part of why the same policy stance that eases a credit card bill also trims what a savings account pays. Nationally advertised savings yields near 4.15 percent and CD yields near 4.2 percent today reflect where the current, comparatively elevated policy rate sits in that same channel, not a separate decision made independently of it.

Fixed Mortgages Answer to the Bond Market More Than the Announcement Itself

Most U.S. mortgages are 30-year fixed loans, and their rate is set primarily by yields on long-term mortgage-backed bonds, which move on inflation expectations and investor demand over a much longer horizon than an overnight lending rate. That is why the 30-year average, near 6.69 percent according to Freddie Mac's published survey, does not move in lockstep with the federal funds rate and can drift higher even while the Fed holds steady, if long-term yields move for reasons of their own. It is also why a Fed cut does nothing at all for the roughly nine in ten U.S. mortgage holders locked into a fixed rate already; the mechanism only reaches them when they sell, refinance, or take out a new loan.

The chart below lines up four of these figures side by side, not because one source reported them together, but because arranging them shows how far apart they sit even though each answers, on its own timeline, to the same policy decision.

Where the One-To-Two-Year Lag Leaves Room for the Cycle to Reverse

After holding its policy rate near zero through the pandemic, the Fed raised it repeatedly, reaching 5.25 to 5.50 percent by late summer of that tightening cycle, the highest level since early 2001, in response to the fastest inflation in four decades. It began cutting the following year and again the year after that, arriving at the current 3.50 to 3.75 percent range and holding there for five consecutive meetings by its most recent decision, a 9 to 3 vote.

The RBA's own explainer is candid about what that timeline means for interpreting today's data: some estimates put the lag between a policy change and its maximum effect on the real economy at one to two years, and the size of that effect is genuinely uncertain because the structure of the economy shifts and the spread between the policy rate and other market rates widens or narrows with financial conditions that have nothing to do with the central bank. That means the inflation and employment readings coming in now largely reflect decisions made a year or more ago, not the setting in place today, and any read on where borrowing costs go next inherits that same uncertainty.