When stock markets swing wildly and savings accounts pay almost nothing, many investors look for a middle ground: investments that protect capital without taking equity risk. US government debt securities, specifically I-bonds and Treasury bills, offer that safety with government backing and no market volatility.

What You Will Learn

This guide walks you through buying I-bonds and Treasury bills directly from the US Treasury. You will learn what each product does, how to open a TreasuryDirect account, how to purchase both securities, and how to decide which fits your savings timeline and inflation protection needs.

Understanding I-Bonds

Series I Savings Bonds (I-bonds) are inflation-protected savings bonds issued by the US Treasury. The interest rate has two components: a fixed rate set at purchase (which never changes for that bond) and an inflation rate that adjusts every six months based on the Consumer Price Index.

I-bonds earn interest for 30 years. You must hold them for at least 12 months. If you cash them before five years, you forfeit the last three months of interest. There is no penalty after five years.

Purchase limits apply: you can buy up to $10,000 in electronic I-bonds per calendar year through TreasuryDirect, plus up to $5,000 in paper I-bonds using your federal tax refund. Interest is exempt from state and local taxes, and federal tax can be deferred until you cash the bond or it matures at 30 years (US Department of the Treasury, 2026).

I-bonds make sense for medium-term savings (one to ten years) when you want inflation protection and do not need immediate liquidity.

Understanding Treasury Bills

Treasury bills (T-bills) are short-term government securities with maturities of 4, 8, 13, 26, or 52 weeks. They are sold at a discount to face value. The difference between what you pay and the $100 or $1,000 face value you receive at maturity is your interest.

For example, if a 26-week T-bill is auctioned at $98.50 for a $100 face value, you earn $1.50 when it matures, which translates to an annualized yield. T-bills are extremely liquid: you can sell them before maturity on the secondary market, though the price will fluctuate with interest rates tracked by the Federal Reserve (Board of Governors of the Federal Reserve System, 2026).

There is no purchase limit on T-bills. You can buy as little as $100 or as much as $10 million in a single auction. Interest is exempt from state and local taxes but subject to federal income tax in the year the bill matures.

T-bills work well for short-term cash you need within a year, emergency fund parking, or as a higher-yield alternative to a savings account when rates are attractive.

How to Buy Through TreasuryDirect

Both I-bonds and T-bills are purchased through TreasuryDirect.gov, the Treasury’s online platform. Here is the process:

Step 1: Go to TreasuryDirect.gov and click “Open an Account.” You will need your Social Security number, a US address, a bank account for linking, and an email address.

Step 2: Complete identity verification. The system asks personal questions based on your credit history to confirm your identity.

Step 3: Once your account is approved (usually within minutes), log in and navigate to “BuyDirect.”

Step 4: For I-bonds, select “Series I,” enter the amount (minimum $25, maximum $10,000 per year), and confirm. The bonds are purchased immediately at the current rate.

Step 5: For T-bills, select “Bills” and choose the maturity (4, 8, 13, 26, or 52 weeks). Enter the purchase amount in $100 increments. You can place a non-competitive bid (you accept whatever rate the auction sets) or a competitive bid (you specify a yield, and your order fills only if the auction rate is at or below your bid). Most individual investors use non-competitive bids.

Step 6: The Treasury debits your linked bank account on the issue date. For T-bills, you pay the discounted price, and the full face value is deposited back to your account at maturity. For I-bonds, you pay the face value upfront.

All holdings appear in your TreasuryDirect account. Interest accrues automatically, and you can redeem I-bonds or let T-bills mature without further action (US Securities and Exchange Commission, 2026).

Read also: I-Bond Rate Update: Whether to Buy or Redeem After the May Announcement

How to Decide Between I-Bonds and T-Bills

Your timeline and goal determine the better choice:

Choose I-bonds if: You are saving for a goal one to ten years away, want automatic inflation protection, can lock up the money for at least 12 months, and value tax deferral. I-bonds work well for college savings (with education tax exclusions), medium-term emergency funds, or parking money you do not need immediately.

Choose T-bills if: You need liquidity within a year, want a predictable yield you can calculate upfront, or are building a bond ladder with staggered maturities. T-bills suit short-term cash reserves, quarterly tax payment funds, or a safe place to park proceeds while you decide on the next investment.

You can use both: keep six to 12 months of expenses in a high-yield savings account or short-term T-bills for liquidity, then layer I-bonds for longer-term reserves. As covered in Principles of Finance (OpenStax, Rice University, 2022), diversifying maturity dates reduces reinvestment risk and maintains access to cash at regular intervals.

Practical Tips

Ladder your T-bills. Instead of buying one 52-week bill, split the amount into four 13-week bills with staggered purchase dates. Every quarter a bill matures, giving you regular liquidity and opportunities to reinvest at current rates.

Reinvest I-bond interest. Since interest compounds semiannually inside the bond, you do not receive cash until you redeem. This forced reinvestment can grow savings faster than manually reinvesting interest from other securities.

Use tax refunds for extra I-bonds. The $5,000 paper I-bond limit via tax refund (Form 8888) is separate from the $10,000 electronic limit, giving you $15,000 total annual capacity if you have a large refund.

Verify current rates before buying. I-bond rates reset every May and November. T-bill auction rates change weekly. Check TreasuryDirect.gov for the latest rates so you know what you are locking in.

Common Mistakes to Avoid

Buying I-bonds for short-term needs. The 12-month lockup and three-month interest penalty before five years make I-bonds a poor choice if you might need the money soon. Keep true emergency funds in a savings account or short T-bills instead.

Ignoring opportunity cost. If inflation is low and T-bill yields are high, T-bills may outperform I-bonds over a one-to-three-year period. Compare the I-bond composite rate to equivalent-maturity T-bill yields before deciding.

Forgetting about estate planning. TreasuryDirect allows beneficiaries, but you must designate them in your account settings. Without a beneficiary, securities pass through probate.

Frequently Asked Questions

Are I-bonds and T-bills FDIC insured?
No. They are backed by the full faith and credit of the US government, which is considered safer than FDIC insurance (the government itself issues both). FDIC insurance covers bank deposits, not Treasury securities.

Can I lose money on I-bonds or T-bills?
I-bonds cannot lose nominal value; the worst case is zero real return if deflation offsets the fixed rate. T-bills held to maturity return full face value. If you sell a T-bill before maturity, the secondary market price fluctuates with interest rates, and you could receive less than you paid, though losses are typically small given the short duration.

What happens to I-bonds after 30 years?
They stop earning interest and should be redeemed. The Treasury does not automatically cash them out; you must log in to TreasuryDirect and redeem them manually.

Conclusion

I-bonds and Treasury bills give you direct access to government-backed, low-risk investments that fit different timelines and goals. I-bonds protect against inflation and suit medium-term savings, while T-bills offer liquidity and predictable short-term yields. Opening a TreasuryDirect account takes minutes, and both securities require no fees or broker commissions. Review your cash needs, compare current rates, and use these tools to anchor the safe portion of your portfolio.

Disclaimer: This article provides educational information and does not constitute personalized investment advice. Treasury security rates and rules are current as of July 2026; verify terms at TreasuryDirect.gov before purchasing. Consult a financial advisor for guidance tailored to your situation.