Skip to main content
I bond: October or November?

What's my I bond worth?

Official through May 2026 · later: Projection

Worth on Oct 1, 2026 Official$1,104.00

If you cash in then: $1,091.60 (after the 3-month penalty)

  • Announced rates
  • Projection
  • Your date
Issue month
The purchase price, $25 to $10,000 (electronic bonds to the cent; paper bonds $50 and up).
Value as of
Bonds are valued on the 1st of each month. Up to 30 years after the issue month.
Inflation after April 2027 (same as Nov 2026)Assumption
Inflation rate for every announcement after April 2027

Only matters after the rates Treasury has announced. Nov 2026 uses 1.63% (forecast).

Nothing you type leaves your browser.

Not affiliated with the U.S. Treasury, TreasuryDirect or BLS.

Your bond's value

Interest earned (before any penalty)
$104.00
3-month penalty if cashed then
−$12.40
Rate on that dateOfficial
4.66%
Rate changes next on
Nov 1, 2026
No penalty from
May 1, 2029
Stops earning (30 years)
May 1, 2054
Fixed rate
1.30%
Age on that date
2 years 5 months

TreasuryDirect shows this value in your account. Paper bonds: use its Savings Bond Calculator (opens in a new tab).

3-month penalty$25 unit roundingComposite rate

Value on each anniversary (table)
Cash-in value of $1,000.00 on each anniversary of the issue month
DateValueStatus
May 1, 2025$1,029.60Official
May 1, 2026$1,071.20Official
May 1, 2027$1,121.20Projection
May 1, 2028$1,172.80Projection
May 1, 2029$1,240.80Projection
May 1, 2030$1,298.40Projection
May 1, 2031$1,358.40Projection
May 1, 2032$1,421.60Projection
May 1, 2033$1,487.20Projection
May 1, 2034$1,556.00Projection
May 1, 2035$1,628.00Projection
May 1, 2036$1,703.20Projection
May 1, 2037$1,782.40Projection
May 1, 2038$1,864.80Projection
May 1, 2039$1,951.20Projection
May 1, 2040$2,041.60Projection
May 1, 2041$2,136.40Projection
May 1, 2042$2,235.20Projection
May 1, 2043$2,338.80Projection
May 1, 2044$2,447.20Projection
May 1, 2045$2,560.40Projection
May 1, 2046$2,679.20Projection
May 1, 2047$2,803.20Projection
May 1, 2048$2,932.80Projection
May 1, 2049$3,068.80Projection
May 1, 2050$3,211.20Projection
May 1, 2051$3,360.00Projection
May 1, 2052$3,515.60Projection
May 1, 2053$3,678.40Projection
May 1, 2054$3,848.80Projection

How the value is calculated

The $25 unit, monthly growth, the 3-month penalty

Exact value for any I bond since 1998, with the 3-month penalty, the way TreasuryDirect calculates it. Treasury values every I bond from a $25 unit. Each month the unit grows by the bond's current composite rate (value × (1 + rate ÷ 2) to the power of months ÷ 6), rounded to the cent, and every 6 months the result becomes the new starting value. Your bond's value is the unit value times your amount ÷ $25, rounded to the cent. Before 5 years, cashing in costs the last 3 months of interest, but you never get back less than you paid.

We checked this method against 34 answers from TreasuryDirect's own Savings Bond Calculator and every cell of its I bond rate chart: they match to the cent. See the formulas and sources.

Sources

TreasuryDirect and 31 CFR 359 · checked Oct 10, 2026

  1. TreasuryDirect: I bonds interest rates (opens in a new tab)

    Checked

    Primary source

  2. TreasuryDirect: I bond rate chart (PDF) (opens in a new tab)

    Checked

    Primary source

  3. TreasuryDirect: Cash in a savings bond (opens in a new tab)

    Checked

    Primary source

  4. TreasuryDirect: Savings Bond Calculator (opens in a new tab)

    Checked

    Primary source

  5. 31 CFR Part 359: Series I savings bonds (eCFR) (opens in a new tab)

    Checked

    Primary source