Inflation-Proof Your Portfolio: TIPS & I Bonds

This guide shows you how to shield your investment portfolio from inflation using two government-backed securities: Treasury Inflation-Protected Securities (TIPS) and Series I Savings Bonds (I Bonds). You’ll learn what each is, how to buy them, how much to allocate, and how to avoid common pitfalls. By the end, you’ll have a clear action plan to preserve your purchasing power.

What You’ll Need

• A brokerage account (for TIPS) or a TreasuryDirect account (for I Bonds)
• Your Social Security number and bank details for verification
• Funds you won’t need for at least 1 year (I Bonds) or until maturity (TIPS)
• Basic understanding of bond terms: face value, coupon rate, yield, and maturity

Step-by-Step

1. Assess your inflation exposure. Calculate what portion of your portfolio is in cash or fixed-income assets that don’t adjust for inflation (like traditional bonds or CDs). If you have more than 20–30% in such assets, you’re vulnerable. Also consider your time horizon: if you need the money within 5 years, inflation protection is more urgent.
2. Understand TIPS. TIPS are U.S. Treasury bonds whose principal adjusts with the Consumer Price Index (CPI). When inflation rises, the principal increases; when deflation occurs, it decreases. At maturity, you get the adjusted principal or the original, whichever is higher. The interest rate (coupon) is fixed, but the actual interest payments vary because they’re based on the adjusted principal.
3. Understand I Bonds. I Bonds are savings bonds that earn a composite rate: a fixed rate (set at purchase, stays for the bond’s life) plus an inflation rate (adjusted every May and November based on CPI). The combined rate changes every six months. I Bonds are sold at face value (e.g., you pay $50 for a $50 bond) and accrue interest for 30 years. They can be cashed after 1 year, but if you redeem before 5 years, you lose the last 3 months of interest.
4. Choose your purchase method. For TIPS, you can buy new issues at auction through TreasuryDirect or buy existing TIPS on the secondary market through any brokerage. For I Bonds, you must buy them directly from TreasuryDirect (electronic) or with your tax refund (paper). Note: I Bonds have an annual purchase limit of $10,000 per person per calendar year (electronic) plus up to $5,000 with a tax refund.
5. Decide on allocation. A common rule of thumb is to dedicate 5–10% of your fixed-income allocation to inflation-protected securities. For example, if you have $100,000 in bonds, $5,000–$10,000 could go to TIPS or I Bonds. If you’re retired or near retirement, consider a higher percentage (up to 20%) because you have less time to recover from inflation. Younger investors might use a lower percentage and focus on growth assets.
6. Buy TIPS at auction (if new). TreasuryDirect announces auction dates (typically January, April, July, and October for 5-year and 10-year notes). Set a reminder, log in, and place a non-competitive bid. You’ll receive the yield determined at auction. You can buy in increments of $100 (minimum $100).
7. Buy TIPS on secondary market (if existing). In your brokerage account, search for TIPS by CUSIP (e.g., 9128283M6). Check the yield to maturity, which may be negative if inflation expectations are high. Buy at least one bond ($1,000 face value) or more. Keep in mind that the price you pay may be above or below par, affecting your effective yield.
8. Buy I Bonds. Go to TreasuryDirect.gov, create an account (or log in), and navigate to “Buy Direct Securities.” Choose Series I Savings Bonds, enter the amount (up to $10,000), and fund via bank account. You’ll receive the current composite rate (e.g., 4.28% as of May 2024). The bond is issued on the first of the month after purchase.
9. Set up a ladder (optional). To manage interest rate risk, consider buying TIPS with staggered maturities (e.g., 5, 10, 30 years). For I Bonds, you can buy annually to build a ladder of bonds with different fixed rates.
10. Monitor and rebalance. Review your portfolio annually. If inflation spikes, your TIPS and I Bonds will increase in value or interest, so you may need to sell some to rebalance back to your target allocation. Conversely, if inflation falls, your allocation may shrink—decide if you want to top up.

Common Mistakes

• Ignoring the annual purchase limit on I Bonds. You can’t buy $50,000 in one year; plan ahead if you want a larger position.
• Buying TIPS without understanding deflation. While TIPS protect against inflation, they can lose principal in deflation (though you get the original at maturity). This is a risk if you sell before maturity.
• Confusing TIPS coupon rate with yield. The coupon is fixed, but the yield to maturity (which includes inflation adjustments) is what matters. A low coupon doesn’t mean low return if inflation is high.
• Redeeming I Bonds before 5 years. You lose 3 months of interest, which can eat into your gains if you redeem early.
• Forgetting about taxes. TIPS interest and inflation adjustments are taxable at the federal level (state and local exempt). I Bonds interest is tax-deferred until redemption, and it’s exempt from state and local taxes. If used for education, it may be federal tax-free under certain income limits.
• Over-allocating to inflation protection. If you put 50% of your portfolio in TIPS, you may miss out on growth. Inflation protection is a hedge, not a growth strategy.

Tips

• Use a TIPS fund for simplicity. If you don’t want to manage individual bonds, consider a low-cost TIPS ETF or mutual fund (e.g., iShares TIP or Schwab US TIPS). This gives diversification and automatic reinvestment.
• Check the real yield. The real yield is the yield after inflation. If it’s negative (like in 2020–2021), you’re guaranteed to lose purchasing power if held to maturity, but you may still beat cash.
• Consider I Bonds for emergency savings. Since they’re liquid after 1 year (with penalty before 5), they can serve as a higher-yield savings account for inflation protection.
• Buy I Bonds at the end of the month. If you buy on the last day of the month, you get interest for the entire month, effectively earning a month’s interest for one day’s investment.
• Hold TIPS in tax-advantaged accounts. The inflation adjustment creates taxable income each year, so holding TIPS in an IRA or 401(k) defers that tax.

Troubleshooting

• Can’t open a TreasuryDirect account? Ensure you’re entering your bank account details correctly. If you get an error, try a different browser or clear cookies. For persistent issues, call the TreasuryDirect help desk.
• I Bonds not showing up after purchase? Bonds are issued on the first of the month following purchase. If you bought in late May, they’ll appear on June 1. Check your “Current Holdings” tab.
• TIPS price seems too high? If the price is above par, that’s because the principal has been adjusted upward due to past inflation. You’re paying for that accrued inflation adjustment.
• Negative yield on TIPS? This is normal when inflation expectations are high. You’ll still receive inflation adjustments, but the real return is negative. Compare to I Bonds, which may offer a better deal.
• Redeeming I Bonds early and losing interest? If you need the money before 5 years, accept the 3-month penalty. To minimize loss, redeem after the 3-month mark from a rate change, so you lose the lowest-interest months.

Frequently Asked Questions

Are TIPS and I Bonds the same?

No. TIPS are marketable securities that trade on the open market; their principal adjusts with inflation. I Bonds are non-marketable savings bonds; they earn a composite rate that changes semiannually. TIPS can be bought and sold anytime, while I Bonds have a 12-month lock-up and a 5-year early redemption penalty.

What is the current I Bond rate?

As of November 2024, the composite rate is 3.11% (fixed rate 1.20% + inflation rate 1.90% annualized). Rates change every May and November. Check TreasuryDirect for the latest.

Can I lose money with TIPS?

If you hold to maturity, you won’t lose principal (you get the original face value or adjusted principal, whichever is higher). However, if you sell before maturity, the market price may be lower than what you paid, especially if real interest rates rise.

How much can I buy in I Bonds per year?

You can buy up to $10,000 in electronic I Bonds per Social Security number per calendar year, plus up to $5,000 in paper I Bonds using your federal tax refund. If you’re married, each spouse can buy their own limit.

Are TIPS taxable?

Yes, TIPS interest and the inflation adjustment to principal are subject to federal income tax in the year they accrue, even though you don’t receive the principal increase until maturity. They are exempt from state and local taxes. Holding them in a tax-deferred account avoids this annual tax.

What’s the best way to buy TIPS?

For simplicity, buy new issues at auction through TreasuryDirect (non-competitive bid) or buy a TIPS ETF. For more control, buy individual TIPS on the secondary market through your brokerage. Compare yields and fees.

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