Savings Options: HYSAs, CDs, I-Bonds, T-Bills

Beyond the Emergency Fund: Where to Park Your Savings

Once your emergency fund is established, you likely have additional savings goals: a home down payment, a car replacement fund, a vacation fund, education savings, or simply money you want to keep safe while earning a decent return. The question is where to put this money.

The US offers several safe savings vehicles, each with different characteristics for returns, liquidity, tax treatment, and purchase limits. Understanding these options helps you match each dollar to the right vehicle based on when you will need it.

High-Yield Savings Accounts (HYSAs)

HYSAs are the workhorse of safe savings. They offer the simplest combination of competitive returns, full liquidity, and FDIC insurance.

Current Landscape

As of early 2026, top HYSAs offer approximately 4.0-5.0% APY, depending on the Federal Reserve’s rate environment. These rates fluctuate — when the Fed raises rates, HYSA rates tend to follow up; when the Fed cuts, HYSA rates decline.

Advantages

• Full liquidity. Withdraw anytime with no penalty via ACH transfer (1-2 business days)
• FDIC-insured. Up to $250,000 per depositor per institution
• No minimum balance. Most HYSAs require $0 to open and maintain
• Compounding. Interest compounds daily or monthly, maximizing your return
• Simplicity. No purchase process, no maturity dates, no paperwork

Disadvantages

• Variable rate. Your APY can drop at any time if the Fed lowers rates
• Taxable interest. Interest is taxed as ordinary income (federal and state)
• Inflation risk. If rates drop below inflation, you lose purchasing power

Best Use

Emergency funds, short-term savings goals (less than one year), and money you may need at any time.

Certificates of Deposit (CDs)

CDs lock your money for a set period in exchange for a guaranteed fixed rate. This rate lock is the key advantage — no matter what happens to market rates during the term, your CD continues earning the agreed-upon rate.

How They Compare to HYSAs

When the Fed is cutting rates, CDs can be more attractive than HYSAs because they lock in today’s higher rate. When the Fed is raising rates, HYSAs may be better because they adjust upward while your CD remains stuck at the lower locked-in rate.

CD Strategies for Maximizing Returns

CD ladder. Split your savings across CDs with staggered maturity dates. For $12,000:

Each year, a CD matures. You either use the money or reinvest in a new 4-year CD at current rates. This provides both rate optimization and regular liquidity.

Brokered CDs. Available through brokerage accounts (Fidelity, Schwab, Vanguard), brokered CDs can be sold on the secondary market before maturity. You may lose or gain value depending on rate movements, but you avoid the early withdrawal penalty.

Best Use

Money you will not need for 6-60 months, especially when you want to lock in a guaranteed rate.

I-Bonds (Series I Savings Bonds)

I-Bonds are one of the most powerful savings tools available to US consumers, yet most people have never heard of them. They are inflation-protected government bonds purchased directly from the US Treasury.

How I-Bonds Work

I-Bonds earn a composite rate consisting of two components:

1. Fixed rate — set when you buy the bond, stays the same for the life of the bond
2. Inflation rate — adjusts every six months based on the CPI-U (Consumer Price Index)

The composite rate = fixed rate + (2 x inflation rate) + (fixed rate x inflation rate). In practical terms, your I-Bond return always includes inflation protection plus the fixed rate premium.

Key Rules

• Purchase limit. $10,000 per person per calendar year in electronic I-Bonds (plus up to $5,000 in paper I-Bonds purchased with your tax refund)
• Minimum purchase. $25 electronic (any amount to the penny above $25)
• Lock-up period. Cannot redeem for 12 months after purchase
• Early redemption penalty. If redeemed before 5 years, you forfeit the last 3 months of interest
• Tax advantages. Interest is exempt from state and local income tax. Federal tax can be deferred until redemption (up to 30 years). If used for qualified education expenses, interest may be exempt from federal tax as well.
• Where to buy. TreasuryDirect.gov — the only place to purchase electronic I-Bonds

When I-Bonds Shine

I-Bonds are exceptional when:

• Inflation is high or rising (the inflation component boosts your return)
• You want a guaranteed real return (the fixed rate is your minimum real return)
• You have money you will not need for at least one year (12-month lock-up)
• You want state-tax-free interest income
• You are saving for education expenses (potential full tax exemption)

When I-Bonds Are Less Attractive

• The fixed rate is 0% and inflation is low (your total return is minimal)
• You need the money within 12 months (cannot redeem)
• You want to invest more than $10,000/year (purchase limit)

Treasury Bills (T-Bills)

T-Bills are short-term US government securities with maturities ranging from 4 weeks to 52 weeks. They are backed by the full faith and credit of the US government — arguably the safest investment in the world.

How T-Bills Work

T-Bills are sold at a discount to their face value. You pay less than $100 per bill and receive exactly $100 at maturity. The difference is your return. For example, you might pay $96.50 for a 52-week T-Bill and receive $100 at maturity — a return of approximately 3.6%.

How to Buy T-Bills

TreasuryDirect.gov. Buy directly from the government with no fees. Minimum purchase is $100. You can set up automatic reinvestment so that when one T-Bill matures, the proceeds automatically purchase a new one.

Brokerage accounts. Fidelity, Schwab, Vanguard, and other brokers let you buy T-Bills on the secondary market or at Treasury auctions. This is more convenient if you already have a brokerage account and want to manage everything in one place.

T-Bill ETFs. Funds like SHV (iShares Short Treasury Bond ETF) or BIL (SPDR Bloomberg 1-3 Month T-Bill ETF) hold portfolios of T-Bills and trade like stocks. These offer instant liquidity but charge a small expense ratio.

Tax Advantages

T-Bill interest is exempt from state and local income tax — the same as I-Bonds. For residents of high-tax states like California (13.3% top rate) or New York (10.9% top rate), this tax exemption significantly boosts the after-tax return compared to HYSAs or CDs.

Example: A T-Bill yielding 5.0% with a combined 30% federal + 10% state tax rate has a net after-tax return of 3.5% from a HYSA but 3.5% + state tax savings from a T-Bill. The T-Bill’s state-tax-free treatment provides an effective yield boost.

Best Use

Short-term savings (1-12 months) for people in high-tax states, or as a cash management tool within a brokerage account. For those interested in broader investing strategies, T-Bills can serve as the “safe” portion of a diversified portfolio.

Series EE Bonds

Series EE Bonds are a unique government savings product with one remarkable feature: they are guaranteed to double in value if held for 20 years, regardless of the stated interest rate. This means your effective minimum return is approximately 3.5% per year if held to the 20-year mark.

Key Rules

• Purchase limit: $10,000 per person per year (electronic)
• Fixed interest rate set at purchase (currently modest)
• Guaranteed to be worth double the purchase price at 20 years
• State and local tax exempt
• Can be tax-free if used for qualified education expenses
• Cannot redeem for 12 months; forfeit 3 months of interest if redeemed before 5 years

Best Use

Long-term education savings (20+ years away) or as a guaranteed-return component of a very conservative long-term strategy. The 20-year doubling guarantee makes EE Bonds most attractive when market interest rates are low, as the guaranteed 3.5% annualized return may exceed market rates.

Comparison Table

Building Your Savings Strategy

Here is how to combine these vehicles based on your needs:

Emergency fund (3-6 months): High-yield savings account. Liquidity is paramount.

Short-term goals (1-3 years): Mix of HYSA and CD ladder. Lock in rates when favorable.

Medium-term goals (3-7 years): I-Bonds (up to $10,000/year) plus CD ladder. The inflation protection of I-Bonds is valuable over longer periods.

Education savings (10-20+ years): Series EE Bonds (guaranteed doubling at 20 years) and I-Bonds (potential tax exemption for education). Consider 529 plans as well, which are covered in the investment options lesson.

Cash allocation in investment portfolio: T-Bills or T-Bill ETFs within your brokerage account, capturing state tax advantages.

Key Takeaways

• High-yield savings accounts are the best home for your emergency fund — liquid, safe, and earning 40-500x more than traditional banks.
• CDs lock in guaranteed rates, making them valuable when you expect rates to fall.
• I-Bonds provide inflation protection with state-tax-exempt interest and a $10,000/year purchase limit.
• Treasury bills offer state-tax-exempt short-term returns, especially valuable in high-tax states.
• Series EE Bonds guarantee doubling at 20 years, making them unique for long-term conservative savings.
• Match each savings vehicle to your time horizon: HYSAs for now, CDs for months, I-Bonds for years, EE Bonds for decades.

This lesson completes Module 3: Saving and Emergency Funds. You now understand the habit of saving, how to build an emergency fund, and where to keep your savings. In the next lesson, you will begin Module 4 by learning how credit scores work — the key that unlocks (or locks) your access to borrowing at favorable rates.