Cash, Money Market, or HYSA — Match the Vehicle to the Job
High-yield savings, money market funds, and everyday cash compared on liquidity, yield, and protection, so you can match the vehicle to the job. Includes a free cash-growth calculator. No login. Educational only, not financial advice.
The three homes for short-term cash
Short-term cash has three common homes: a high-yield savings account, a money market fund, and the plain checking or brokerage cash you spend from. All are liquid and low-risk relative to investing, but they differ in how fast you can reach the money, what protection sits behind it, and how much it earns while it waits.
Protection is the real difference
A high-yield savings account is a bank deposit with FDIC insurance within limits. A money market fund is an investment product at a brokerage — not a bank deposit and not FDIC insured — though the brokerage account has SIPC protection. Both track short-term rates, so their yields tend to move together and the gap is usually small.
Match cash to when you need it
The money you spend this month belongs somewhere immediate, even if it earns little. Buffer and sinking-fund money can sit in a HYSA or money market where it earns more while staying reachable. Sort real quoted rates by after-tax value on the best savings rates page and the after-tax yield calculator.
Related reading
Continue with best savings rates, after-tax yield calculator, emergency fund calculator, and the redundancy-first money framework.
Frequently asked
What is the difference between a high-yield savings account and a money market fund?
A high-yield savings account is a bank deposit account covered by FDIC insurance within limits. A money market fund is an investment fund at a brokerage that is not a bank deposit and is not FDIC insured, though the brokerage account has SIPC protection for the account itself. Both are liquid and track short-term rates; the main differences are the protection behind them and where they sit. This is educational only and not financial advice.
Is a money market fund the same as a money market account?
No. A money market account is a bank deposit account, similar to savings, and is FDIC insured within limits. A money market fund is an investment fund at a brokerage and is not a bank deposit or FDIC insured. They often pay comparable yields and are both liquid, but the protection and the provider differ.
Which pays more, a HYSA or a money market fund?
Neither reliably pays more; both track short-term interest rates, so their yields move together and the gap is usually small and changes over time. The more useful comparison is what you keep after tax, since interest is generally taxable. Most of the benefit comes from not leaving cash in a near-zero checking account. Verify any rate on the provider official site.
Does Obsidian Metrics recommend a specific account?
No. This is a free educational comparison of account types in general terms. It explains how a high-yield savings account, a money market fund, and everyday cash differ on liquidity, yield, and protection. It does not recommend any specific bank, fund, or product, and the yields shown are illustrative rather than quotes. We are not financial advisors.