Where Cash Earns the Most: A Clear Breakdown

Your Cash Is Working Against You If It Sits in the Wrong Place

Most people treat cash as an afterthought. It collects in a checking account, a sweep account, or a savings account that hasn't been reviewed in years. Meanwhile, the gap between the best and worst cash options on the market today can cost you hundreds — sometimes thousands — of dollars per year in foregone interest.

Right now, the range runs from a genuinely embarrassing 0.01% APY at some major brokerage sweep accounts all the way to 4.35% at top-tier savings accounts and CDs — and that's before factoring in tax advantages that can push the effective yield even higher for investors in upper income brackets.

This isn't about timing the market. It's about knowing where to park cash for your emergency fund, short-term savings, or uninvested brokerage money — and making sure every dollar is earning what it should. Here's what the landscape looks like, and how to think through it systematically.

The Three Filters Every Cash Decision Needs

Before comparing specific products, apply the same three-part framework to every option:

1. Yield — The headline number. What's the actual annual percentage yield (APY) or interest rate?

2. Tax treatment — Federal and state taxes can materially change your effective return. A 3.22% municipal money market yield can outperform a 3.78% Treasury yield for someone in the top federal bracket, once you account for what the IRS takes.

3. Liquidity — Can you access the money quickly and without penalty? A high yield that locks your cash away for six months may not suit an emergency fund, even if the rate looks attractive.

Run every option through these three filters before deciding. The product with the highest headline rate isn't always the smartest choice.

Savings Accounts and CDs: The Banking Layer

High-yield savings accounts remain a straightforward starting point. The top-yielding options — aggregated on comparison sites like DepositAccounts.com — are currently offering around 4.34% APY, and balances are FDIC-insured up to $250,000 per depositor per institution.

The key advantage is liquidity: there are no lock-up periods, and you can move money out freely. The key risk is rate variability. The bank can adjust its rate at any time, and savings account rates tend to track the federal funds rate — meaning if the Federal Reserve cuts rates, yields will follow.

Certificates of deposit (CDs) trade some of that flexibility for a fixed rate. Three-month CDs are currently yielding around 4.35%, competitive with savings accounts but with a defined term. Early withdrawal typically triggers a penalty calculated on the term length.

For investors who hold a brokerage account, brokered CDs offer a structural difference: instead of selling back to the bank, you sell to other investors on the secondary market. This means no explicit early-withdrawal penalty — but if interest rates have risen since you bought the CD, you'll sell at a discount. For short-term CDs of three months or less, that interest rate risk is minimal and manageable.

One critical point that applies to all bank-based products: all interest earned is fully taxable at both the federal and state level (where applicable). That changes the real-world comparison significantly.

Sweep Accounts: The Hidden Cost of Convenience

If you hold a brokerage account, you almost certainly have a sweep account — the default home for uninvested cash. This is where dividends land between investments, where proceeds from a sale sit while you decide what to do next.

The variance in sweep account yields is staggering. Schwab's default sweep account currently pays 0.01% APY. That is not a typo. On $50,000, that's $5 per year. This is a significant revenue source for the brokerage — your idle cash generates returns that flow to them, not to you.

By contrast, Fidelity's standard sweep — the SPAXX money market fund — currently yields around 3.47%. On the same $50,000, that's $1,735 per year. The difference is real money.

Vanguard's Cash Plus account yields approximately 3.35%, also well ahead of Schwab's default.

If you use Schwab, the answer isn't necessarily to move your brokerage — it's to actively move uninvested cash out of the default sweep and into a higher-yielding alternative. Schwab offers Treasury and money market fund options that pay meaningfully more. The default account is only the problem if you leave money there without reviewing it.

Money Market Funds and T-Bill ETFs: Where to Invest Cash for Beginners and Experienced Investors Alike

For investors wondering how to invest money for beginners — or even seasoned investors who want a low-risk parking spot — money market funds and short-duration Treasury ETFs represent a flexible middle ground between savings accounts and traditional investments.

Standard Money Market Funds

Vanguard's Federal Money Market Fund (VMRXX) currently yields approximately 3.79%. Its Treasury Money Market Fund runs at around 3.78%. Because Treasury money market funds hold U.S. government securities, the interest generated is exempt from state income tax — a meaningful advantage in high-tax states like California, New York, New Jersey, or Oregon.

Municipal Money Market Funds

This is where the analysis gets more interesting — and where most investors leave money on the table.

Vanguard offers municipal money market funds that pay interest exempt from federal income tax. The flagship fund, VMSXX, currently yields around 3.22%. That sounds lower than the Treasury fund's 3.78% — until you do the tax math.

Using Fidelity's tax-equivalent yield calculator, a 3.22% federal-tax-exempt yield becomes equivalent to a 4.82% Treasury yield or a 5.37% CD yield for an investor in the top marginal federal tax bracket. For high earners, the municipal money market fund isn't just competitive — it's the clear winner.

Important caveats:

• Vanguard's state-specific municipal funds (California and New York) provide exemption from state income tax as well, but only for residents of those states.
• These funds are only available through Vanguard. Fidelity offers a comparable fund (FTEXX), currently yielding around 2.85% — lower than Vanguard's offering.
• Always verify the percentage of fund holdings that qualify for your specific state's tax exemption, as some blended funds hold a mix of in-state and out-of-state bonds.

T-Bill ETFs

For investors who want Treasury bill exposure without directly purchasing bills, ETFs like VBIL (Vanguard's 0–3 month Treasury Bill ETF) offer a liquid, diversified option with a current yield of approximately 3.66%. A comparable option is SGOV (iShares 0-3 Month Treasury Bond ETF), which has recently run close to or slightly above VBIL on a net-of-fee basis.

Note that the 30-day SEC yield on these ETFs can lag the actual current T-bill yield by several weeks, because it reflects income earned over the trailing 30 days — not today's rate. When rates are rising quickly, as they have been, the ETF's reported yield will appear lower than the current direct T-bill yield. The gap narrows over time as the fund rolls into newer, higher-yielding bills.

For the absolute highest yield on short-term Treasuries, purchasing T-bills directly through TreasuryDirect.gov or through your brokerage eliminates the management fee entirely. Four-week T-bills have recently carried coupon-equivalent yields near 3.97%, with 8-week bills near 4.10%.

How to Choose: A Practical Decision Framework

The right answer depends on your specific situation. Here's how to think through it:

If you're in a low or middle tax bracket:

• High-yield savings account or 3-month CD for maximum yield with FDIC protection
• Vanguard Federal Money Market Fund if you have a Vanguard brokerage account
• T-bill ETF (VBIL or SGOV) if you want flexibility across any brokerage

If you're in a high federal tax bracket (32%+):

• Run the tax-equivalent yield calculation before assuming the higher headline rate wins
• Vanguard VMSXX (municipal money market fund) likely outperforms on an after-tax basis
• If you're in California or New York, the state-specific Vanguard muni fund may outperform everything else on a combined federal + state after-tax basis

If you're at Schwab:

• Move uninvested cash out of the 0.01% default sweep immediately
• Consider Schwab's Treasury money market fund or a T-bill ETF as alternatives

If your timeline is under 3 months:

• Prioritise liquidity — no-penalty savings accounts or money market funds over CDs

If your timeline is 3–12 months:

• CDs, brokered CDs, or T-bills purchased directly may offer the best locked-in rates

The Bottom Line on Cash Yields

The spread between the best and worst cash options available today is wider than most investors realise. In a world where 4%+ yields are available on FDIC-insured savings accounts and tax-advantaged money market funds, leaving cash in a default sweep account paying 0.01% is a costly oversight — not a neutral choice.

The framework is consistent regardless of how much you're investing or which platform you use: evaluate yield, tax treatment, and liquidity in that order, then match the product to your specific tax situation and timeline. Whether you're managing an emergency fund, staging capital for a near-term purchase, or simply holding cash between investments, there's no reason to leave significant yield on the table.

For investors exploring how to invest money for beginners, cash management is often the overlooked first step. Getting this right doesn't require a financial advisor. It requires about 30 minutes of comparison and a willingness to move money to where it's working harder for you.

Frequently Asked Questions

Are high-yield savings accounts safe?

Yes — high-yield savings accounts at FDIC-member banks are insured up to $250,000 per depositor per institution. As long as your balance stays within that limit, your principal is protected regardless of what happens to the bank.

What is a money market fund and how does it differ from a savings account?

A money market fund is a type of mutual fund that invests in short-term, high-quality debt instruments — such as Treasury bills, government agency securities, or short-term municipal bonds. Unlike a savings account, it is not FDIC-insured, though money market funds (especially government and Treasury variants) are considered very low risk. Returns are typically competitive with or better than high-yield savings accounts, and some offer tax advantages that savings accounts do not.

What does tax-equivalent yield mean, and why does it matter?

Tax-equivalent yield is the pre-tax return a taxable investment would need to earn to match the after-tax return of a tax-advantaged investment. For example, a municipal bond fund yielding 3.22% may be equivalent to a 4.82% Treasury yield for an investor in the top federal tax bracket, because the municipal interest isn't subject to federal income tax. Ignoring this calculation can lead investors to choose lower after-tax returns while chasing higher headline rates.

Can I buy Treasury bills directly without a brokerage?

Yes. TreasuryDirect.gov allows U.S. residents to purchase T-bills, Treasury notes, and other government securities directly from the U.S. Department of the Treasury with no intermediary fees. The minimum purchase is $100. This route offers the highest yield on T-bills by eliminating any fund management fee, though it is less liquid than an ETF — you cannot easily sell a T-bill on TreasuryDirect before maturity.

What should beginners know about investing money in short-term instruments?

For anyone learning how to invest for beginners with little money, short-term cash instruments are a practical starting point. They carry very low risk, provide real returns above inflation in the current environment, and build familiarity with concepts like yield, duration, and tax treatment — without the volatility of equities. The key is to avoid the inertia of leaving cash in a low-yield default account and to actively compare options based on your tax situation and how soon you'll need the money.

This article is for informational purposes only and does not constitute financial advice. Always consult a qualified financial professional before making investment decisions.