If you have ever watched the Federal Reserve raise rates and then waited months for your bank to pass any of it along, only to see your APY drop within days of the first cut, you have run into deposit beta. It has an unhelpful name and a very simple meaning, and once you understand it, a lot of otherwise confusing bank behavior stops being confusing.
Deposit beta measures how much of a change in the Fed’s benchmark rate a bank actually passes through to the people holding its deposits.
The arithmetic
Say the Fed raises its target rate by 0.50 percent. Your bank responds by lifting your savings APY from 3.00 percent to 3.30 percent, a move of 0.30 percent. Divide what you got by what the Fed did and you get 60 percent. That is a deposit beta of 60. The other 40 percent of the increase, the 0.20 percent your bank kept, widens the gap between what the bank earns on its assets and what it pays you.
A competitor that lifts its rate by 0.40 percent on the same 0.50 percent move has a beta of 80. It is handing more of the increase to depositors and keeping less.
The same math runs in reverse when the Fed cuts, and this is where savers get frustrated. Betas on the way down are usually higher than betas on the way up. Banks are quick to pass along cuts and slow to pass along increases, because in both cases they are doing the same thing: protecting the spread.
Why the spread is the whole story
A bank’s core business is borrowing at one rate and lending at a higher one. Your deposits are the borrowing side. Mortgages, auto loans, credit card balances, and Treasury holdings are the lending side. The difference is net interest margin, and it is the main thing bank executives get asked about on earnings calls.
Every basis point a bank does not pay you goes straight to that margin. So the incentive is obvious and completely rational from the bank’s side. Pay depositors as little as competitive pressure allows.
The phrase doing the work there is competitive pressure. That is the only reason deposit betas are ever high at all, and it is the reason your rate depends far more on which bank you chose than on what the Fed did last month.
The gap between banks is bigger than the gap between Fed decisions
Here is what the current numbers look like. The Fed’s target range sits at 3.50 to 3.75 percent, and the effective federal funds rate was 3.63 percent as of July 1, 2026. Meanwhile the FDIC’s national average rate for savings accounts is 0.38 percent.
Read those two numbers next to each other for a second. The Fed is at 3.63 percent. The typical American savings account pays 0.38 percent. That is a deposit beta close to zero across the deposits sitting at large branch based banks, and it has stayed close to zero through an entire rate cycle.
Now compare that to the competitive end of the market, where top high yield savings accounts are paying in the neighborhood of 4 percent. Same country, same Fed, same week. The difference is roughly 3.6 percentage points, which on a $20,000 balance is about $720 a year.
No Fed decision in living memory has moved a saver’s income by that much. The choice of institution did.
Why online banks behave differently
Online banks tend to run much higher deposit betas, and it is not because they are generous. It is because they have no branches, no tellers, and no reason for you to stay other than the number on the screen.
A traditional bank has switching friction working in its favor. Your direct deposit is set up, your bills are on autopay, you know where the branch is, your kid’s account is linked to yours. Moving is a chore, and banks price accordingly. An online bank has none of that stickiness, so it has to compete on rate, and it passes through more of every increase to keep the balances it has. The difference in how quickly online and traditional banks track the Fed shows up clearly in published APY histories.
That also explains why online rates move down quickly. A bank competing purely on rate watches its rivals constantly. When one trims, the others follow within weeks, because there is no reason to be the highest payer by a wide margin when a modest lead does the same job.
What this means for how you hold cash
Two things follow from all of this, and neither one is complicated.
The first is that chasing the Fed is the wrong frame. Reading rate decision coverage and trying to time a savings account is effort spent on the smaller variable. Picking a bank that has demonstrated a high beta over several years is the bigger one, and it is a decision you make once.
The second is that a high yield savings account is not a fixed rate product. It floats, by design, and the disclosures say so. If your plan depends on a specific yield surviving the next 18 months, a savings account is the wrong instrument for that portion of your money. Certificates of deposit and Treasury bills lock a rate for a defined term and are the tools built for that job. They also lock up access, which is why emergency money generally belongs in the savings account regardless of what the rate does.
There is a middle path some savers use. Keep the emergency fund liquid and accept the floating rate, then put money with a known future date, a tax bill, a down payment, a tuition payment, into a CD or T-bill maturing around when you need it. You give up flexibility you were not going to use anyway.
A reasonable habit
Check your savings APY twice a year. Not weekly, because the noise will drive you crazy and the differences between a 4.10 and a 4.05 are not worth a Saturday.
What you are watching for is drift. If your bank was competitive two years ago and now sits a full percentage point below the top of the market, that is not a rate cycle, that is your bank deciding you are not going anywhere. Betas tell you what a bank thinks of your inertia. The response is to prove it wrong once, then go back to ignoring the whole thing.