Move emergency savings from a big-bank account to a HYSA or government money market fund now Government money market funds are often safer, more liquid, and higher-yielding than bank savings In high-tax states, T-bills and Treasury money markets offer a real after-tax edge Don't hold more cash than your tiered plan requires — excess cash drags on long-term wealth Cash optimization is the lowest-effort, highest-certainty improvement most investors can make

High-Yield Savings and Cash Management: Making Idle Money Work

Curated by: Rubric Advisors

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The Cost of Parking Cash at a Big Bank

Big-bank savings accounts typically pay 0.01-0.06% — a tiny fraction of what's available
On $50K, even a 3-4% gap between big-bank and online rates means over $1,500/year in lost earnings
Big banks get away with low rates because most people never bother to switch
Optimizing cash isn't exciting, but it's one of the most certain improvements you can make
The goal: don't leave real money on the table for cash you'll need within 1-2 years

High-Yield Savings Accounts (HYSAs)

Online banks (Ally, Marcus, SoFi) typically offer significantly higher APY than big banks
FDIC-insured up to $250,000 per depositor per bank — same protection as any bank
No fees, no minimums at most providers; transfers to checking take 1-3 business days
Rates float with the Fed — they'll fall when the Fed cuts rates
Ideal for your first 1-2 months of emergency expenses where quick access matters

Money Market Funds: A Step Up

Money market funds are brokerage mutual funds that invest in T-bills, commercial paper, and similar
Government money market funds (SPAXX, VMFXX, SWVXX) hold mostly Treasuries, so interest is state-tax-free
Prime money market funds hold commercial paper — slightly higher yield, not state-tax exempt
Not FDIC-insured but designed to hold a stable $1.00 value — effectively no credit risk
Same-day access at most brokerages makes these a strong parking spot for larger cash balances

Treasury Bills: The State-Tax Advantage

T-bill interest is exempt from state and local taxes — a big boost in high-tax states like CA or NY
In California, the state-tax exemption on T-bills adds roughly 10-13% to their effective yield for top earners
Buy T-bills at TreasuryDirect.gov or through Fidelity, Schwab, or Vanguard at no charge
Treasury money market funds give you the same state-tax perk with same-day liquidity
Best for cash you won't need for 1-12 months where the state-tax savings are meaningful

Building a Cash Management Hierarchy

Checking: 1-2 weeks of expenses for daily spending — keep it minimal
Tier 1: 1-2 months of expenses in a HYSA for immediate emergencies — prioritize access speed
Tier 2: 3-6 months of expenses in a money market fund or T-bills — higher yield, same safety
Near-term cash: money for a down payment or tax bill goes in a T-bill or CD timed to the date
Long-term cash: money you won't need for 1+ years should be invested — inflation erodes it

Key Takeaways

Move emergency savings from a big-bank account to a HYSA or government money market fund now
Government money market funds are often safer, more liquid, and higher-yielding than bank savings
In high-tax states, T-bills and Treasury money markets offer a real after-tax edge
Don't hold more cash than your tiered plan requires — excess cash drags on long-term wealth
Cash optimization is the lowest-effort, highest-certainty improvement most investors can make

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The Cost of Parking Cash at a Big Bank

High-Yield Savings Accounts (HYSAs)

Money Market Funds: A Step Up

Treasury Bills: The State-Tax Advantage

Building a Cash Management Hierarchy

Key Takeaways

Related Topics

Money Market Accounts vs Money Market Funds

Budgeting Methods: How to Find the Right Approach for Your Money

Understanding Banks and Deposits

The Cost of Parking Cash at a Big Bank

High-Yield Savings Accounts (HYSAs)

Money Market Funds: A Step Up

Treasury Bills: The State-Tax Advantage

Building a Cash Management Hierarchy

Key Takeaways

Related Topics

Money Market Accounts vs Money Market Funds

Budgeting Methods: How to Find the Right Approach for Your Money

Understanding Banks and Deposits