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Guide

I Bonds vs. TIPS: Which Inflation-Protected Investment Is Right for You?

By TheFinanceBase Team 11 min read

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Neither I Bonds nor TIPS is universally better. I Bonds are non-marketable savings bonds designed for money you can leave untouched for at least a year. They accrue interest, generally defer federal income tax until redemption, and have a $10,000 annual purchase limit per Social Security number. TIPS are marketable Treasury securities that pay interest every six months, accommodate much larger purchases and can be sold before maturity, but their market prices fluctuate and their inflation adjustments are federally taxable as they occur.

For bonds issued from May 1 through October 31, 2026, the I Bond composite rate is 4.26%, including a 0.90% fixed rate. That rate is date-specific; the composite rate and inflation component reset every six months.

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What separates I Bonds from TIPS?

Both securities are issued by the U.S. Treasury and are intended to protect purchasing power from inflation. They do it through different mechanisms, however, so the practical choice depends on when you need the money, how much you want to invest, whether you need periodic income and how you want taxes reported.

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Decision axis I Bonds TIPS
Marketability Not traded in a secondary market; redeemed under savings-bond rules Purchased at auction or through banks, brokers and dealers; can be sold in the secondary market
Inflation adjustment Inflation is incorporated into a composite interest rate; interest accrues and is paid when the bond is redeemed Principal is adjusted with the Consumer Price Index (CPI); coupon payments are based on the adjusted principal
Minimum purchase $25 $100
Purchase capacity $10,000 per Social Security number per calendar year TreasuryDirect lists up to $10 million for a noncompetitive auction bid
Access to cash No redemption during the first 12 months; a three-month interest penalty applies when redeemed before five years Can be sold before maturity, but the sale price may be higher or lower than the purchase price
Federal tax timing Generally deferred until redemption, final maturity or another taxable disposition Interest and inflation adjustments that increase principal are generally taxable in the year they occur
State and local income tax Exempt Exempt
Available terms 30 years 5, 10 or 30 years

The TreasuryDirect comparison of TIPS and Series I Savings Bonds supplies these terms and cautions that the Treasury does not provide investment advice. Your decision should therefore start with liquidity, tax timing, purchase capacity, cash-flow needs, investment horizon and tolerance for price changes.

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When I Bonds are the better fit

You can leave the money invested for at least one year

I Bonds cannot be redeemed during the first 12 months after purchase. That makes them unsuitable for an emergency fund or any expense with a known need inside the next year. After the first year, redemption is allowed, but bonds redeemed before their fifth anniversary lose the most recent three months of interest. There is no early-redemption penalty after five years.

You want a savings product without a quoted market price

I Bonds are not marketable securities. You do not watch a daily bid or ask price, and you cannot sell one to another investor. The value is governed by the savings-bond redemption rules rather than by changing bond-market prices. This structure removes the possibility of a market-price loss caused by selling at an inconvenient time, but it also removes the ability to sell before the 12-month lockout or to raise cash by selling part of a large position in the secondary market.

Your annual purchase is within the limit

The electronic and other purchase rules give each Social Security number a $10,000 calendar-year limit for I Bonds. The $25 minimum makes small, regular purchases possible, but the limit can be restrictive for a large inflation-protection allocation. If you need to invest more than that amount in a year, TIPS offer substantially greater capacity.

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You prefer accrued interest and generally deferred federal tax

I Bond interest accumulates inside the bond instead of arriving as a regular cash coupon. Federal income tax is generally deferred until you redeem the bond, it reaches final maturity or another taxable disposition occurs. Both the inflation-related and fixed components are part of the accrued value. I Bonds are exempt from state and local income tax.

You want a rate that includes a fixed component

For I Bonds issued May 1 through October 31, 2026, the composite rate is 4.26%, of which 0.90 percentage points are fixed. The inflation component and composite rate reset every six months. The quoted rate applies to bonds issued during that six-month issuance window, not indefinitely to every I Bond you already own. Check the Treasury’s current rate announcement before purchasing.

When TIPS are the better fit

You need more purchase capacity

TIPS can accommodate purchases far beyond the I Bond annual limit. TreasuryDirect’s comparison lists a maximum of up to $10 million for a noncompetitive auction bid. Actual auction rules, account requirements and availability should be confirmed for the specific auction or brokerage account you use.

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You need a tradable security

TIPS can be bought at Treasury auctions or through banks, brokers and dealers. They can also be sold in the secondary market before maturity. That flexibility is valuable when your horizon changes, when you are building a ladder of maturity dates or when you need to rebalance a portfolio. It comes with a cost: the market value can move every day.

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You want periodic cash income

TIPS pay interest semiannually. The coupon rate is applied to the inflation-adjusted principal, so the dollar amount of a coupon payment can change as the principal changes. This differs from an I Bond, whose interest is accrued and normally received only when the bond is redeemed.

You are comfortable with pre-maturity price risk

When market interest rates rise, existing fixed-rate bonds generally become less valuable relative to newly issued bonds, and TIPS prices can fall. Inflation expectations, real interest rates, time remaining to maturity and overall demand also affect the price. A TIPS holder who sells before maturity can therefore receive less than the purchase price, even if the bond’s inflation-adjusted principal has risen.

You are building a defined maturity ladder

TIPS are available in 5-, 10- and 30-year terms. Buying different maturities can create a schedule of principal repayments for future spending goals. The ladder remains tradable before each maturity, but its interim value will still reflect current market conditions.

How inflation protection works in each security

I Bonds: an inflation-sensitive composite rate

An I Bond’s interest rate combines a fixed rate with an inflation component. Interest accrues over time, and the composite rate and inflation component reset on a six-month cycle. Because the inflation adjustment is delivered through the accrued rate rather than a separately quoted principal balance, you do not receive a semiannual inflation payment in cash. The amount you receive is determined when you redeem the bond, subject to the early-redemption rules.

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TIPS: CPI-adjusted principal and coupons

For TIPS, the Treasury adjusts principal with changes in the CPI. The coupon rate is applied to that adjusted principal, so coupon dollars rise when the principal rises. If CPI declines, the principal can decline as well. At maturity, however, the holder receives the inflation-adjusted principal or the original principal, whichever is greater. That maturity floor protects the original principal from a net deflation loss if the TIPS is held to maturity; it does not prevent the market price from falling before maturity.

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Liquidity: the decision most investors underestimate

I Bond access rules

  • No redemption is permitted during the first 12 months.
  • Redemption from years one through five costs the most recent three months of interest.
  • After five years, the three-month penalty no longer applies.
  • There is no secondary-market sale, so you redeem under the savings-bond rules rather than choosing a market price.

TIPS sale rules

  • You can sell before maturity through the secondary market after purchasing at auction or through a financial institution.
  • The sale proceeds depend on the market price at that time, not simply on the amount you originally invested.
  • A sale can produce a gain or a loss, even when inflation has increased the bond’s adjusted principal.
  • Holding to maturity preserves the Treasury’s original-principal floor, subject to the bond’s terms; selling early gives up that maturity outcome.

Use I Bonds only for money that can remain inaccessible for a year. Use TIPS when tradability matters enough to accept price volatility. Neither security is a substitute for cash needed immediately.

Taxes and account location

I Bond tax timing

Federal income tax on I Bond interest is generally deferred until redemption, final maturity or another taxable disposition. That timing can prevent a tax bill during the years when the interest is merely accruing. State and local income taxes do not apply. Keep records of purchases and redemptions so the taxable amount is reported correctly when a disposition occurs.

TIPS tax timing

TIPS interest and any inflation adjustment that increases principal are generally reported for federal tax in the year earned. The inflation adjustment can therefore create taxable income even though the related value is not paid to you in cash until a coupon date or maturity. State and local income taxes do not apply.

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Why tax location matters

In a taxable account, the annual federal tax on TIPS adjustments can create a cash-flow obligation without a matching cash distribution. Investors sometimes evaluate whether a tax-advantaged account is appropriate for TIPS for that reason, but account rules, contribution limits and withdrawal taxes vary. I Bonds’ generally deferred reporting may fit better when current taxable income is a priority, although the annual purchase limit still applies. Confirm the treatment with current Treasury and tax guidance or a qualified tax professional before acting.

Purchase process and ongoing management

Step 1: Define the job for the money

Write down the date or range when you might need the funds, whether you need interim income and the maximum amount you want inflation-protected. A one-year lockout rules out I Bonds for near-term needs; a need for a tradable position points toward TIPS.

Step 2: Check capacity and minimums

For I Bonds, plan around the $25 minimum and the $10,000-per-Social-Security-number calendar-year limit. For TIPS, plan around the $100 minimum and the much larger auction capacity listed by TreasuryDirect. Confirm current purchase eligibility and limits before submitting an order.

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Step 3: Choose the purchase channel

I Bonds are savings bonds purchased under TreasuryDirect’s savings-bond rules. TIPS can be purchased at a Treasury auction or through a bank, broker or dealer. An auction purchase and a secondary-market purchase have different pricing mechanics, so read the order details and fees shown by the institution handling the transaction.

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Step 4: Match the term to the goal

I Bonds have a 30-year final maturity but can be redeemed after the first year, subject to the five-year interest penalty. TIPS offer 5-, 10- and 30-year maturities. Select a TIPS maturity that matches a planned spending date when possible; avoid choosing a long maturity solely because its stated coupon appears attractive.

Step 5: Plan for taxes before the first statement

Decide how you will track I Bond cost basis and redemption dates. For TIPS in a taxable account, set aside cash for federal tax on annual interest and inflation adjustments. Keep Treasury or brokerage statements and review the tax forms issued for the account.

Step 6: Review only the risks that apply to your horizon

I Bond owners should monitor the 12-month lockout, the five-year penalty and the annual purchase limit. TIPS owners should monitor real-rate and market-price changes if a sale before maturity is possible. Neither requires daily trading; the review schedule should match the purpose of the holding.

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A practical decision framework

If your priority is… Usually the closer match Reason
Keeping federal tax deferred while interest accrues I Bonds Federal tax is generally deferred until redemption, final maturity or another taxable disposition
Access during the first year Neither I Bonds cannot be redeemed for 12 months; TIPS can be sold, but market value may be below cost
Access after purchase with a quoted market price TIPS They are marketable and can be sold before maturity
Investing more than $10,000 per Social Security number per year TIPS The I Bond annual limit does not meet that need
Regular cash payments TIPS They pay interest semiannually
A simple savings-bond structure I Bonds No secondary-market pricing; interest accrues until redemption
Protection against deflation through a maturity floor TIPS held to maturity At maturity, Treasury pays adjusted principal or original principal, whichever is greater
Freedom from pre-maturity market-price changes I Bonds They are not marketable, although redemption restrictions still apply

Common mistakes and how to avoid them

Treating the current I Bond rate as permanent

The 4.26% composite rate applies only to I Bonds issued from May 1 through October 31, 2026. Rates reset on a six-month schedule. Check the applicable issue window and rate before buying rather than assuming today’s figure will continue.

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Putting emergency cash into I Bonds

The 12-month redemption lockout makes I Bonds inappropriate for money that may be needed immediately. Keep a separate accessible reserve for near-term expenses.

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Assuming TIPS cannot lose value

The maturity floor does not guarantee the price you would receive in a sale today. A TIPS position can show a market loss before maturity because real interest rates and bond prices change.

Ignoring the tax bill on TIPS inflation adjustments

An increase in TIPS principal can be federally taxable before you receive that amount in cash. Consider the account type and maintain a plan for paying the tax.

Using the same allocation for every goal

A one-year reserve, a five-year spending target and a 30-year retirement hedge have different liquidity and maturity requirements. Choose the security and term for the specific goal rather than labeling one product the universal inflation solution.

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Examples of sensible use cases

Money needed in two to four years

I Bonds may work if you can leave the money untouched for the first year and accept the three-month interest penalty during years one through five. TIPS may be preferable if you need the option to sell at any time and can tolerate a price below your purchase cost when rates rise.

A large inflation-protection allocation

The $10,000-per-Social-Security-number I Bond limit may be too small. TIPS provide the capacity to invest more, but the position should be sized with annual federal tax reporting and possible market losses in mind.

A future liability with a known date

A TIPS ladder can provide maturities in 5-, 10- or 30-year increments and can be sold if circumstances change. I Bonds provide a single 30-year final-maturity framework with earlier redemption after the first year, rather than a set of marketable maturity dates.

A long-term savings balance with no current income need

I Bonds can accumulate interest without annual federal tax reporting in most cases. Their purchase limit and inability to redeem during the first year remain constraints, so they may be only one part of a broader allocation.

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How to check the decision before buying

  • Horizon: Can the money remain invested for at least 12 months, and if it is an I Bond, possibly five years to avoid the early-redemption penalty?
  • Liquidity: Do you require a secondary-market sale option, or is redemption under savings-bond rules sufficient?
  • Capacity: Is the I Bond annual limit large enough for your objective?
  • Cash flow: Do you need semiannual payments, or is accrued value preferable?
  • Tax timing: Can you handle annual federal tax on TIPS adjustments, or do you prefer generally deferred I Bond taxation?
  • Price risk: Could you hold TIPS to maturity, or might you need to sell during an unfavorable market?
  • Current terms: Have you confirmed the current I Bond rate, auction terms, tax rules and account eligibility?

TreasuryDirect’s guidance is comparative rather than personalized: “We don’t give advice, but we can help you compare the different types of securities.” That is the right way to approach this choice. Select the security whose restrictions and tax treatment you can live with for the entire period you expect to own it, and verify current Treasury and tax information before placing an order.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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