Highest modeled after-tax income
Money market fundThe money market fund leads by about $35.5 in this entered yield and tax scenario.
SwitchWize decision guide
High-Yield Savings vs. Money Market Fund: Which Is Better for Your Cash?
A money market fund may pay more, but it is an investment—not an FDIC-insured bank account. Compare what you keep after taxes and fees, and how quickly you can reach the money.
What you can expect
- No login required
- No credit pull
- Assumptions shown
- Sources included
Quick answer
Choose high-yield savings for money you may need quickly. Consider a money market fund only when its extra earnings remain meaningful after taxes and fees and the access time works for you.
If high-yield savings
Usually better for emergency money, FDIC insurance, and direct access.
If money market fund
Can fit cash already at a brokerage when it earns meaningfully more after taxes and fees.
If stay put
Can make sense when your current account pays a competitive rate and moving adds little value.
Key number to watch
The HYSA must average about 4.05% APY to match the entered fund yield after modeled fees and taxes.
Test your situation
See your result in dollars
Change any number below to match your situation. No login is required. Saved decisions stay on this device, and signed-in users can revisit them across devices.
$
Cash being compared.
months
Expected time in either option.
%
The annual percentage yield shown by the savings account.
%
A recent annualized yield, not a guaranteed APY.
Your answer so far
The money market fund leads by about $35.5 in this entered yield and tax scenario.
See the full breakdownThe money market fund leads by about $35.5 in this entered yield and tax scenario.
High-yield savings
$1,402
modeled after-tax interest
$1,267 vs. baseline
Money market fund
$1,438
modeled after-tax income
$1,303 vs. baseline
Stay put
$135
modeled after-tax interest
your baseline
Try a scenario
What could change this
The HYSA must average about 4.05% APY to match the entered fund yield after modeled fees and taxes.
How certain: scenario dependent
Check these assumptions
- • A money market mutual fund is an investment and is not FDIC-insured; it can lose value even though such losses have historically been rare.
- • A 7-day yield is an annualized recent-yield measure, not a guaranteed APY. This model holds the entered average yield as a scenario.
- • The entered 1-day settlement period may make fund cash less immediate for emergencies.
What matters most
Deposit insurance
High-yield savingsEligible savings deposits are FDIC-insured within applicable limits; money market mutual funds are not FDIC-insured.
Brokerage cash management
Money market fundA fund can keep cash near investments, but settlement and redemption timing still matter.
Immediate bank access
High-yield savingsSavings access is generally more direct; a fund redemption can require settlement and transfer time.
Side-by-side comparison
Rate measure
These measures are not interchangeable guarantees.
- High-yield savings
- APY
- Money market fund
- 7-day yield
- Stay put
- APY
Protection
- High-yield savings
- Eligible FDIC deposit coverage
- Money market fund
- Not FDIC-insured
- Stay put
- Depends on product and institution
Access
- High-yield savings
- Bank transfer or withdrawal
- Money market fund
- Redemption plus settlement/transfer
- Stay put
- Existing workflow
Primary risk
- High-yield savings
- APY falls
- Money market fund
- Yield/NAV/liquidity risk
- Stay put
- Persistent low yield
What could go wrong
High-yield savings account
- What needs to work
- The APY remains competitive.
- Common problem
- The bank cuts APY.
- What it could cost
- A persistent yield gap.
- How to prepare
- Usually high.
Money market mutual fund
- What needs to work
- The yield advantage survives taxes, fees and access needs.
- Common problem
- Yield falls or cash is not immediately available.
- What it could cost
- A protection or liquidity mismatch.
- How to prepare
- High in normal markets, subject to settlement.
Current bank account
- What needs to work
- The account remains competitive.
- Common problem
- Inertia hides lost income.
- What it could cost
- Compounding opportunity cost.
- How to prepare
- High once noticed.
A simple backup plan
Separate emergency money from brokerage money
Money needed soon and money meant for investing do not need the same account.
- 1Keep immediate obligations in an eligible insured deposit.
- 2Compare the fund only for cash already serving an investment-account purpose.
- 3Recheck yield, tax treatment and access after rate changes.
Educational illustration only. The right amount depends on your needs and timing.
What to do next
Question 1
Is this first-line emergency cash?
Yes: Favor an eligible insured deposit.
No: Compare after-tax yield and settlement.
Question 2
Is the fund advantage material after fees and tax?
Yes: Verify fund type and access mechanics.
No: Favor simplicity.
Question 3
Could the cash be needed before settlement?
Yes: Keep that layer in savings.
No: A fund may fit the brokerage layer.
Plain-text decision tree. Is this first-line emergency cash? If yes, Favor an eligible insured deposit. If no, Compare after-tax yield and settlement. Is the fund advantage material after fees and tax? If yes, Verify fund type and access mechanics. If no, Favor simplicity. Could the cash be needed before settlement? If yes, Keep that layer in savings. If no, A fund may fit the brokerage layer.
When to check again
- Either yield changes 0.50 point.
- The fund changes strategy or fees.
- The cash becomes emergency money.
- Your tax situation changes.
- Balance approaches applicable insurance limits.
Methodology
Savings uses effective APY; the fund uses an entered annualized-yield scenario, reduced by entered fees and taxes.
Savings starts from live SwitchWize data; fund yield and tax-exempt share are user-entered.
- • Fund NAV movement and temporary liquidity tools are not quantified.
- • Tax treatment depends on actual holdings and annual tax reporting.
- • Provider transfer times vary.
Sources and defaults are reviewed quarterly and after material rule changes. Editorial conclusions do not depend on affiliate availability.
Sources
Frequently asked questions
Is a money market fund FDIC-insured?
No. It is a mutual fund, not a bank deposit.
Is a money market account the same thing?
No. A bank money market deposit account can be an eligible insured deposit; a money market mutual fund is an investment.
What is a 7-day yield?
It is an annualized measure based on a recent seven-day period, not a guaranteed future return.
Can a fund lose money?
Yes. Losses have been rare for stable-value funds, but principal is not guaranteed by the FDIC.
Is government-fund income state-tax free?
Not automatically. The exempt share depends on actual holdings and state rules.
Which is better for emergencies?
Direct access and eligible deposit insurance usually make savings the cleaner first-line reserve.