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How I-Bonds protect your savings from inflation

A government savings bond whose interest rate adjusts with inflation. Useful for medium-term savings, with some annoying restrictions.

Most useful: ages 25-655 min readReviewed by Joseph CitizenLast reviewed April 10, 2026

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Series I Savings Bonds (usually called I-Bonds) are US savings bonds whose interest rate has two parts: a fixed rate that stays the same for the life of the bond, and a variable rate that adjusts every six months based on inflation.

Why people use them

  • Guaranteed to keep up with inflation: your purchasing power doesn't erode
  • Backed by the US government: no default risk
  • Federal income tax deferred until you cash out; exempt from state and local tax
  • Can be tax-free if used for qualified education expenses

The annoying restrictions

  • $10,000 per person per year purchase limit (electronic)
  • Must be held at least 1 year: no early withdrawal allowed
  • Withdraw before 5 years and you forfeit the last 3 months of interest
  • Only sold through TreasuryDirect.gov, which has a clunky interface

When they make sense

Money you won't need for at least 5 years, but want kept safe with inflation protection. Not for emergency funds (locked up), not for long-term retirement (stocks usually do better), but useful as a middle layer.

What this lesson is NOT

I bonds come with real restrictions: a one-year lockup, a penalty for cashing in before five years, and an annual purchase cap. This lesson explains when they fit despite that; it is not a claim they are the best home for every dollar of savings.

Test what you learned5 questions · ~2 min

Quick check on this lesson

Answer each question and we’ll show you why the right answer is right, and why the others aren’t.

  1. 1.

    How is an I-Bond's interest rate structured?

  2. 2.

    What's the main reason people use I-Bonds?

  3. 3.

    What is the annual purchase limit for electronic I-Bonds per person?

  4. 4.

    What happens if you withdraw an I-Bond before holding it for 5 years (but after the 1-year minimum)?

  5. 5.

    Per the 'When they make sense' section, what time horizon are I-Bonds best suited for?

0 of 5 answered

Reflection (private to you, stored locally)
★ End of lesson · Chapter 06 of 09
Course progress · 0 of 9 chapters · Banking & Savings