Cash feels safe. Over time, excess cash quietly works against you through lower returns, inflation, and taxes.
In Episode 29 of Return on Reason, we dive into how to optimize the return on your cash by exploring how much to hold and where to hold it, so that it works for you, not for your bank or brokerage.
When cash may stop being a reserve and become a drag on wealthWhy it’s easier than ever to earn more on cash and how small changes may improve your after-tax return while helping minimize volatilityWhere cash should live today, from high-yield savings accounts to money market funds to Treasury bills and moreWhy banks and brokerage firms may benefit when you leave your cash idle00:00 One Word That Cost Investors $2B (1-3)
Why cash matters and the Capital One savings account story.
05:36 Why Investors Leave Cash Uninvested (4-5)
Vanguard research on rollover IRAs sitting idle.
07:34 The Three Drags on Cash (6)
Inflation, taxes, and lower expected returns.
14:09 The Cash Yield Ladder
Checking accounts, savings accounts, money markets, CDs, and Treasury bills.
18:40 How Deposit Insurance Works (7-8)
Understanding FDIC limits and bank failure risk.
22:13 Why Banks Love Your Idle Cash (9)
How banks and brokerages profit from idle deposits.
30:09 Taxes and After-Tax Yield
Treasury money markets, municipal funds, and tax equivalent yield.
36:21 When Cash Optimization Matters Most
Why larger balances make small differences meaningful.
40:19 Why People Hold Too Much Cash
Behavioral reasons and income variability.
42:16 The Liquidity Ladder
Daily spending, emergency funds, and goal-based savings.
49:00 Action Steps for Investors
How to evaluate and optimize your cash.
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They Thought Their Money Was in High-Interest Accounts—They Got Paid Peanuts (WSJ, 2024)Capital One Is Sued by Regulator Over the Bank’s Savings Accounts (WSJ, 2025)Capital One to Pay $425 Million in 360 Savings Interest-Rate Settlement (WSJ, 2026)Out of sight, out of market: The IRA cash drag (Vanguard, 2024)The “sticky” IRA cash trap (Vanguard, 2024)Global Investment Returns Yearbook (Dimson, Marsh & Staunton, 2025)Failed Bank List from the Federal Deposit Insurance Corporation (FDIC)Nobel Prize in Economics on the Role of Banks (2022)Schwab Annual Report (Schwab, 2026)References to third-party charts, graphs, and other illustrations are for educational purposes only. These materials are intended to provide general context and should not be relied upon alone in making investment decisions. Any such information has limitations and should be considered together with an investor’s individual financial circumstances and objectives. Information contained herein has been obtained from sources considered reliable, but its accuracy and completeness are not guaranteed. It is not intended as the primary basis for financial planning or investment decisions and should not be construed as advice meeting the particular investment needs of any investor. This material has been prepared for information purposes only and is not a solicitation or an offer to buy any security or instrument or to participate in any trading strategy. Past performance is no guarantee of future results.