Savers holding cash in traditional bank accounts are losing hundreds of dollars a year in potential interest while money-market funds pay roughly 400 times more on the same balances. The SEC’s latest asset-weighted seven-day gross yield data shows money-market funds delivering returns near 4 percent, depending on fund category. The FDIC’s national rate for savings deposits, last updated in a snapshot dated May 18, 2026, sits at a fraction of a percent. That gap has real consequences for anyone parking emergency funds or short-term savings at a major bank.
A 4 percent yield gap and what it means for bank depositors
The spread between money-market fund yields and bank savings rates has widened into one of the starkest mismatches in recent memory. Short-term Treasury rates tracked in the Federal Reserve series remain elevated, and money-market funds, which invest heavily in government securities and short-term commercial paper, pass those rates through to shareholders almost immediately. Big banks, by contrast, have kept their posted savings rates near zero, relying on customer inertia rather than competitive pricing.
The practical math is straightforward. A household with $25,000 in a traditional savings account earning the FDIC national average would collect a negligible return over a full year. The same amount placed in a money-market fund yielding near 4 percent would generate close to $1,000 in annual interest. That difference compounds quickly for families trying to build a financial cushion or save for a down payment.
The stage-1 hypothesis that retail deposit balances at the largest U.S. banks will decline by at least 8 percent quarter-over-quarter if this spread persists through the next two FOMC meetings is plausible in direction but difficult to confirm at that exact threshold. The FDIC’s Summary of Deposits report does not publish the underlying bank-level observations used to calculate the national savings rate, and no publicly available survey data tracks household switching behavior in real time. Deposit outflows have historically accelerated when yield gaps widen, but the precise pace depends on consumer awareness, brokerage account access, and whether banks respond with promotional rate offers.
SEC filings and FDIC snapshots confirm the numbers
The yield figures rest on mandatory regulatory filings, not marketing materials. Every money-market fund registered with the SEC must file Form N-MFP monthly, reporting portfolio holdings, asset values, and the seven-day gross yield defined under Rule 30b1-7. The SEC aggregates these filings into money-fund yield statistics that present asset-weighted averages by category, including government, prime, and tax-exempt funds. Researchers and investors can also download the raw Form N‑MFP files as monthly data sets extracted from EDGAR, allowing independent verification of the yield calculations.
On the deposit side, the FDIC publishes a regularly updated set of national rate tables that reflect average interest paid on savings, money-market deposit accounts, and certificates of deposit across insured institutions. These figures are based on data that banks report to regulators and are used to establish rate caps for institutions that are less than well capitalized. While the FDIC tables do not disclose individual bank offerings, they provide a consistent benchmark showing that the typical savings account rate remains far below what money-market funds currently pay.
Because both sets of figures come from regulatory filings, they offer a clearer picture than promotional advertisements or anecdotal reports. The SEC data reveal how quickly fund yields adjust as short-term market rates move, while the FDIC averages highlight how slowly many banks raise rates on legacy deposits. Together, they document a structural gap between what cash can earn in capital markets and what it typically earns when left in a standard savings account.
Why the gap persists-and what savers can do
Several factors help explain why such a wide spread can persist. Many households still view their primary bank as the default home for cash, even when interest rates are low. Opening a brokerage account or learning how to move funds into a money-market product can feel intimidating, and banks benefit from that friction. In addition, large institutions fund significant portions of their balance sheets with “core” deposits that are relatively insensitive to rate changes, giving them little incentive to compete aggressively on yields for existing customers.
Regulation also plays a role. Bank deposits carry explicit FDIC insurance up to statutory limits, offering a government guarantee that most money-market funds do not. That protection, combined with immediate access to cash via checking and debit cards, leads many savers to accept lower returns as the price of perceived safety and convenience. Money-market funds, while tightly regulated and generally conservative, are still investment products that can in rare cases experience losses or liquidity constraints.
For households, the trade-off is increasingly tangible. Keeping a modest emergency fund in an insured savings account may still make sense for quick access and peace of mind. Beyond that, however, the foregone interest on larger balances can erode purchasing power over time. Savers who are comfortable with brokerage platforms and understand the mechanics of money-market funds may decide that shifting a portion of their idle cash is worth the additional complexity.
The current environment underscores a broader lesson: cash is not a single, uniform asset. Where it is held-and under what terms-can dramatically change the return it earns. As long as short-term market rates remain elevated and banks are slow to pass those rates through, the pressure on depositors to reconsider their options is likely to grow.
