High-Yield Savings vs Money Market Funds: Which for Your Cash?
Both are reasonable. The difference shows up in the tail risk and in your state tax return.
At a glance
Figures checked 1 Sep 2026
Typical APY
Broadly similar; money market funds reprice faster
Access to cash
Savings: 1–2 days. Fund: usually next business day
Protection
Savings: FDIC to $250,000. Fund: SIPC covers broker failure only
Tax treatment
Treasury-heavy funds may be partly exempt from state tax
What to take away
- Bank deposits carry federal insurance; money market funds do not.
- Fund yields follow Fed moves almost immediately; bank rates lag in both directions.
- In a high-tax state a Treasury money market fund can win after tax.
| High-yield savings | Money market fund | |
|---|---|---|
| Protection | FDIC / NCUA to $250,000 | SIPC covers broker failure, not losses |
| Yield response | Bank decides, often with a lag | Tracks short rates immediately |
| State tax | Fully taxable | Treasury portion often exempt |
| Access | 1–2 business days | Usually next business day |
| Best for | Emergency fund | Cash already held at a broker |
A practical split: emergency fund in an insured savings account, and cash waiting to be invested in a government money market fund at your broker. Each sits where its particular advantage applies.
Common questions
It has happened in rare, severe market stress. Government and Treasury funds carry less credit risk than prime funds, which is why they are the usual default.