I-Bond Tax Calculator 2026 β Series I Savings Bond, Education Exclusion
Calculate I-Bond tax with 30-year deferred taxation, education exclusion Section 135, 3-month early redemption penalty, and state-tax exemption. Compare deferred vs annual accrual election.
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Your cost basis (what you paid) $
From TreasuryDirect or savings bond calculator Used to calculate early-redemption penalty
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Used only if education purpose selected $
Tuition + fees only (not room/board) $0
Net After-Tax Redemption Value
$0
Total Interest Accrued
$0
Federal Tax Owed
$0
Education Exclusion
I-Bond Tax Calculation Breakdown
I-Bond Tax Rules β 2026 Guide
Series I Savings Bonds offer three tax advantages: (1) 30-year federal tax deferral by default β no tax until redemption, (2) state and local tax exemption always, and (3) potential federal exemption for education under Section 135. The interest rate adjusts semi-annually based on CPI inflation data.
Education Exclusion Phase-Out (2026)
For single filers: Full exclusion below $114,800 MAGI | Zero above $129,800
For MFJ: Full exclusion below $182,100 MAGI | Zero above $212,100
Exclusion reduction = Interest Γ ((MAGI β Phase-Out Floor) Γ· Phase-Out Range)
Excluded interest = Interest β Reduction (cannot exceed qualified ed expenses)
For MFJ: Full exclusion below $182,100 MAGI | Zero above $212,100
Exclusion reduction = Interest Γ ((MAGI β Phase-Out Floor) Γ· Phase-Out Range)
Excluded interest = Interest β Reduction (cannot exceed qualified ed expenses)
Early Redemption Penalty (before 5 years)
If redeemed before 5 years from issue date: last 3 months of interest forfeited.
Example: Hold 2 years (24 months) β receive only 21 months of interest.
The penalty interest is not received and therefore not taxable β it reduces your reportable interest.
After 5 full years: no penalty, all interest taxable at redemption.
Example: Hold 2 years (24 months) β receive only 21 months of interest.
The penalty interest is not received and therefore not taxable β it reduces your reportable interest.
After 5 full years: no penalty, all interest taxable at redemption.
Extended
Education Exclusion Phase-Out + Deferred vs Annual Election Comparison
Full Section 135 phase-out table, year-by-year deferred accrual, and annual vs deferral strategy analysis
Education Exclusion Phase-Out β 2026 MAGI Ranges
| MAGI | Single β Exclusion % | MFJ β Exclusion % |
|---|
Deferred Method vs Annual Accrual Election β Long-Term Impact
Assumes 5% average annual I-Bond rate, $10,000 initial investment, your selected federal rate. Compare net value at year 10, 20, 30.
| Year | Deferral: Value | Deferral: Tax Due (at redemption) | Annual Election: Net Value | Advantage |
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When annual election makes sense: If you expect your tax rate to rise significantly in the future (e.g., currently in the 10β12% bracket and expect to be in 32%+ at redemption), paying tax annually at the low current rate may save money. Otherwise, deferral almost always wins because of the time-value benefit of postponing the tax payment.
Frequently Asked Questions
When do I pay taxes on I-Bond interest?
I-Bond interest accrues monthly but by default you defer all tax until you redeem the bond or it matures after 30 years. You report it in the year of redemption. There is an alternative "annual accrual" election where you report interest each year as it accrues β you must make this election in the first year you own the bond and it applies to all your savings bonds. Most holders use the default deferral method. If the bondholder dies, the estate or beneficiary must report all previously deferred interest in the year of death unless the surviving co-owner continues deferring.
What is the I-Bond education exclusion (Section 135)?
Under Section 135 of the Internal Revenue Code, I-Bond interest may be entirely tax-free if the bond proceeds are used to pay qualified higher education expenses (tuition and fees β not room and board) at an eligible institution, AND your MAGI is under the phase-out range. For 2026: phase-out begins at $114,800 (single) and $182,100 (married filing jointly), with complete phase-out at $129,800 single / $212,100 MFJ. Important requirements: the bond must be issued in your name (or jointly with spouse β not as a gift), you must be at least 24 years old when the bond is issued, and the bond must be issued in the tax year or any prior year.
What is the 3-month interest penalty for early redemption?
If you redeem an I-Bond before 5 years from the issue date, you forfeit the most recent 3 months of interest. For example, if you hold for exactly 2 years, you only receive 21 months of interest (24 minus 3). After 5 years, there is no penalty and you keep all accrued interest. This penalty is applied to the taxable interest you report β you only pay tax on interest actually received, so the penalty reduces both your cash and your tax liability proportionally.
Are I-Bonds subject to state or local income taxes?
No. Like all US government obligations, I-Bond interest is exempt from state and local income taxes under 31 USC 3124. This is true whether you use the deferral method or the annual accrual method, and whether or not you qualify for the education exclusion. Only federal income tax applies. This makes I-Bonds especially valuable in high-tax states like California (13.3%), New York, or New Jersey where the state exemption adds meaningful extra return compared to bank CDs or corporate bonds.
Can I give I-Bonds as a gift and does the gift count against the purchase limit?
Yes, you can purchase I-Bonds as gifts through TreasuryDirect. The gift counts against the RECIPIENT's annual purchase limit ($10,000/person electronic + $5,000 paper via tax refund), not the donor's limit. The gift is not immediately delivered β it sits in a "gift box" and you designate delivery. Once delivered, the bond belongs to the recipient and any future interest is taxed to them. For tax purposes, the gift creates a taxable gift if it exceeds the annual gift exclusion ($19,000 in 2026), but I-Bonds are usually given in amounts well below this threshold.