Bank Deposit Beta Squeeze
The Formal Definition
The structural net interest margin compression experienced by commercial banks and retail broker-dealers when clients rapidly reallocate cash from low-yielding checking and sweep accounts (deposit beta < 0.20) into high-yielding Treasury bills and money market funds (deposit beta ≈ 1.00), forcing banks to fund deposit outflows with expensive wholesale credit.
Deposit Beta = Δ Credited Customer Deposit Interest Rate / Δ Central Bank Policy Benchmark Rate
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Deposit beta is the measure of how much of a rate hike your bank passes on to you. When the Fed raises rates by 5%, high-yield money funds pass on 100% of the increase (beta = 1.0). Retail banks pass on 0.2% (beta = 0.04). When depositors wake up and move hundreds of billions from checking accounts to Treasury bills, the bank faces a 'deposit beta squeeze,' forcing them to borrow at emergency rates to survive the cash drain."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: An investor holding $250,000 in uninvested cash during a central bank rate hiking cycle from 0.25% to 5.25% (+500 bps move)
| Execution Metric | High-Beta Cash Allocator | Low-Beta Bank Sweep Depositor |
|---|---|---|
| Fee / Rate | $0 account fees | $0 advertised fees |
| Spread / Buffer | Moved uninvested cash from a checking account into a sovereign Treasury bill ETF (deposit beta = 0.98) | Left cash sitting in a traditional retail bank sweep account (deposit beta = 0.05) |
| Execution / Status | Cash yield adjusted from 0.25% up to 5.15% across the hiking cycle | Bank raised credited interest from 0.01% to just 0.25% across the entire 500-basis-point cycle |
| Total Cost / Result | Monetized central bank rate hikes through high-beta cash allocation | Suffered severe purchasing power loss due to low deposit beta |
How Brokers Weaponize This Term
Calculate your broker's personal 'Deposit Beta': divide your credited cash sweep rate by the current Fed Funds rate. If your broker's deposit beta is below 0.60, move your idle cash into an ultrashort Treasury ETF (like SGOV or BIL) to reclaim your missing interest yield.
Broker Evaluation Matrix
Cole Approves
Interactive Brokers: Maintains an institutional deposit beta near 0.90, passing through central bank benchmark interest directly on eligible cash balances.
Read Audit →Cole Flags / Avoids
Traditional Banking Conglomerates: Operates with deposit betas below 0.10, capturing multi-billion-dollar net interest margins off uninvested customer sweep balances.
View Trap Details →Frequently Asked Questions
What is a 'deposit beta' in banking?
Deposit beta is the percentage of changes in the central bank policy rate that a bank passes through to its customer deposit accounts.
Why do banks resist raising deposit rates?
Because paying higher deposit rates directly compresses the bank's Net Interest Margin (NIM), reducing corporate profits.