I Bonds Jump to 5.51% on November 1 — Highest Fixed Rate

On Sunday, November 1, 2026, Series I savings bonds start paying a 5.51% composite rate — up from 4.26% — and the part of that rate that actually matters for the long run just hit its highest level in twenty years. The Treasury set the I bond fixed rate at 1.40%, the highest since November 2006. That fixed rate is locked in for the life of any bond you buy between November 1, 2026 and April 30, 2027, which means this buying window is worth a closer look than the usual twice-a-year rate announcement.

Here is the short version: if you have cash you will not need for at least a year, and you have not already used your $10,000 annual I bond limit, this is one of the strongest I bond windows in two decades. If you already hold older I bonds with a 0% fixed rate, the math for swapping them into new bonds is genuinely worth running — and I will run it for you below. And if you already bought your 2026 allocation, you are not shut out: buy in January through April 2027 and you still lock in the same 1.40% fixed rate.

This is not financial advice — just the verified numbers, the rules, and the decision framework, so you can decide with your own situation in mind.

The New Rate, Piece by Piece

An I bond’s rate has two parts, and understanding both is the whole game:

• The fixed rate: 1.40%. Set by the Treasury when you buy. It never changes for the life of the bond — up to 30 years. This is the bond’s real yield above inflation, guaranteed.
• The variable rate: 4.08% annualized. Tied to inflation, measured by the Consumer Price Index. For this period it comes from a 2.04% rise in CPI between April and September 2026. It resets every six months based on your bond’s own purchase month.

The Treasury combines them with a formula — fixed rate plus variable rate plus their product — which is why 1.40% and 4.08% combine to 5.51% rather than a simple 5.48%. The 5.51% composite applies for the first six months after you buy. After that, the variable half resets every six months with inflation, but the 1.40% fixed half stays put for as long as you hold the bond.

Compare that with the previous window: bonds bought May through October 2026 paid 4.26% (0.90% fixed plus 3.34% variable). The jump is 1.25 percentage points on the headline rate and half a point on the fixed rate — and it is the fixed rate that makes this window special. Headline rates come and go with inflation; the fixed rate is the part you keep.

For context, the new 5.51% beats the 1-year Treasury bill, recently yielding about 4.42%, and it beats the best certificates of deposit and high-yield savings accounts available right now. The 5.51% headline is the highest composite since November 2022 — well below the 9.62% peak of the pandemic inflation surge, but that peak came with a 0% fixed rate. This window gives you a strong headline rate and a strong fixed rate at the same time, which is the rarer combination.

Why the Fixed Rate Is the Real Story

Most coverage of this announcement will lead with “5.51%!” and stop there. That headline is the least durable part of the deal. Here is why the fixed rate deserves the attention.

Imagine you buy $10,000 of I bonds in this window. For the first six months you earn about $275.50. Then inflation moves, and your rate moves with it — maybe up, maybe down. But through every one of those resets, for up to 30 years, you keep earning 1.40% above whatever inflation turns out to be. If inflation runs hot for a decade, your bond keeps pace plus 1.40%. If inflation cools to 2%, you still earn roughly 3.40%.

Now compare that with a bond bought in the May–October 2026 window at a 0.90% fixed rate, or worse, an older bond carrying a 0% fixed rate — which is what most I bonds issued in the 2010s and early 2020s carry. A 0%-fixed bond bought years ago earns exactly the inflation rate and nothing more. Right now that means 4.08% for six months — not bad, but $71.50 less per $10,000 per half-year than the new bond’s first six months, and the gap never closes, because the fixed rate never changes.

That permanence is also why the Treasury’s fixed-rate decision is genuinely hard to predict. The Treasury does not publish its formula for setting it. Analysts have reverse-engineered a rough relationship to real yields on 5-year Treasury Inflation-Protected Securities, but the announcement itself is always news. This time the news is good: 1.40% is the highest fixed rate since November 2006, a full twenty years.

The Sell-Old, Buy-New Decision

If you hold older I bonds with low fixed rates, the question writes itself: should you sell them and buy new ones? The honest answer is “it depends on the penalty,” so let us work it through with real numbers.

The rules that shape the decision:

• You cannot redeem an I bond at all in its first 12 months.
• If you redeem before five years, you forfeit the last three months of interest.
• After five years, there is no penalty at all.
• You can buy only $10,000 per person per calendar year in electronic I bonds through TreasuryDirect, and that limit is per Social Security number — a married couple with separate TreasuryDirect accounts can buy $20,000 between them.

Worked example 1: an old 0%-fixed bond, held more than five years. No penalty to sell. Your old bond earns 4.08% for its next six-month period. A new bond earns 5.51% for its first six months, then keeps its 1.40% fixed edge forever. On $10,000, the new bond pays about $71.50 more in the first half-year alone, and the fixed-rate advantage compounds for decades. If you have room under your annual limit, swapping is a clear win — the only cost is the new bond’s own 12-month lockup starting over.

Worked example 2: an old 0%-fixed bond, held two years. Selling costs you three months of interest at the old bond’s current rate: about $102 on $10,000 at 4.08%. The new bond’s first-half advantage is about $71.50, so the swap does not pay for itself in six months — but it does within roughly nine months, and then the 1.40% fixed edge keeps paying for the life of the bond. If you plan to hold for years, the swap still wins; if you might need the money within a year, do not touch it, because the new bond locks your money up for another 12 months.

Worked example 3: a bond bought in 2026 at 0.90% fixed. The gap is smaller — 0.50 percentage points of fixed rate — but on $10,000 held for 20 years, half a point of guaranteed real yield is still worth roughly $1,000 in today’s dollars of extra return, before compounding. Run your own numbers before deciding; the principle is the same, the payoff is just slower.

One timing trick that matters: if you already bought your full $10,000 allocation for 2026, your limit resets on January 1, 2027 — and the 1.40% fixed rate window runs through April 30, 2027. You have four months in the new year to buy at this fixed rate. There is no reason to rush a January purchase on the first day, either: I bonds credit a full month of interest for any purchase made during a month, so buying near the end of a month earns you the same first month as buying on the first. End-of-month buying is the small optimization that costs nothing.

How I Bonds Compare Right Now

The new rate does not exist in a vacuum. Here is where it sits against the other safe places Americans park cash in late 2026:

The comparison that matters most is with high-yield savings accounts, because that is where most people actually keep their emergency fund. A savings account at 4.40% is liquid and flexible, and for money you might need next month it is the right home. An I bond at 5.51% pays more, but you cannot touch it for a year — so it is a second-tier emergency fund at best, not the first tier. The sensible structure for many savers: keep one to three months of expenses in a savings account you can reach tomorrow, and consider I bonds for the deeper reserve you hope never to touch. For the savings-account side of that comparison, see high-yield savings rates in October 2026.

One more comparison worth making: Treasury Inflation-Protected Securities (TIPS). TIPS trade on the market, so their price moves up and down, and a 5-year TIPS currently offers a real yield in the same neighborhood as the I bond’s fixed rate. The I bond’s advantage is that it never loses nominal value — there is no market price to fall — and its interest is tax-deferred until you cash out. The TIPS advantage is no purchase cap and full liquidity. For money you want to protect from inflation without market risk, the I bond’s structure is hard to beat.

The Tax Picture

I bond interest gets unusually friendly tax treatment, and it is part of the return:

• Federal tax is deferred until you redeem the bond or it matures at 30 years. You choose when the tax bill arrives, which lets you time redemptions into lower-income years — retirement, for example.
• State and local income tax: none. I bond interest is exempt from state and local tax entirely, which matters more the higher your state’s rate.
• Education exclusion: interest can be fully or partially excluded from federal tax if you use the proceeds for qualified higher education expenses and your income falls below the phase-out thresholds — reported at $116,800 for single filers and $182,650 for married couples filing jointly for 2026. Check the current IRS figures before relying on this, since the thresholds adjust annually.

One practical note: TreasuryDirect has been moving account logins to ID.me verification. If you have not logged in recently, set that up before you try to buy — do not leave it to the day you plan to place an order.

Who Should Buy, and Who Should Skip

Buy, or seriously consider it, if: you have cash you will not need for at least 12 months; you have not used your $10,000 annual limit; you want inflation protection without market risk; or you hold old 0%-fixed bonds past the five-year penalty window and have limit room to swap.

Wait or skip if: the money might be needed within a year (the lockup is absolute, with very narrow hardship exceptions); you have already used your 2026 limit and would rather wait for the January reset than force a decision; or you are choosing between I bonds and paying down high-interest debt — a credit card at 20%+ always beats a savings bond at 5.51%.

A note on the hype: you will see headlines calling this a “huge” or “massive” return. Keep perspective. The 5.51% lasts six months, not thirty years. What lasts thirty years is the 1.40% real yield, which is genuinely excellent by the standards of the last two decades — but it is 1.40% above inflation, not 5.51% forever. Anyone telling you otherwise is selling the headline, not the bond.

How to Buy

Buying is straightforward, and it happens only one place: TreasuryDirect.gov, the Treasury’s own site. I bonds are not sold through brokers or banks. The minimum electronic purchase is $25, in penny increments up to the $10,000 annual limit per person. You will need your Social Security number and a linked US bank account, and as noted above, an ID.me-verified login if your account has been migrated.

A quick checklist before you buy:

1. Confirm you have annual limit room — check your 2026 purchases in your TreasuryDirect account.
2. Decide the amount with the 12-month lockup in mind, not just the rate.
3. Buy near the end of the month to capture a full month of interest.
4. If you are married and both spouses want the maximum, each of you needs a separate TreasuryDirect account — the limit is per person, not per household.
5. If you already used your 2026 limit, mark January 2027 on your calendar: the 1.40% fixed rate is still available through April 30.

For readers who followed our earlier coverage of the 4.26% rate window that closed October 31: this is the update to that story, not a repeat of it. The rate changed, the fixed rate jumped, and the decision framework changed with it. (That earlier piece is here: I Bonds at 4.26%: the October 31 deadline.)

Frequently Asked Questions

What is the new I bond rate for November 2026?

Bonds purchased November 1, 2026 through April 30, 2027 earn a 5.51% composite rate for their first six months: a 1.40% fixed rate plus a 4.08% annualized inflation rate. After six months, the inflation half resets; the 1.40% fixed half never changes.

Is 5.51% locked in for the life of the bond?

No. Only the 1.40% fixed rate is permanent. The composite rate changes every six months as the inflation component resets. What you lock in forever is 1.40% above inflation — which, at the highest level since November 2006, is the genuinely valuable part.

How much can I buy?

$10,000 per person per calendar year in electronic I bonds through TreasuryDirect, with a $25 minimum. The limit is per Social Security number, so a married couple with separate accounts can buy $20,000 combined. If you already bought your 2026 limit, it resets January 1, 2027 — still inside this fixed-rate window.

When can I cash out?

Not in the first 12 months, no exceptions for ordinary circumstances. Cashing out between years one and five forfeits the last three months of interest. After five years there is no penalty, and the bond keeps earning interest for up to 30 years.

Should I sell my old 0%-fixed I bonds to buy new ones?

If the old bonds are past five years old, there is no penalty and the swap is usually a clear win — you gain 1.40% of guaranteed real yield forever. If they are under five years old, the three-month interest penalty delays the payoff to roughly nine months, so swap only if you plan to hold for years. Either way, the new bond’s own 12-month lockup starts over.

Are I bond earnings taxed?

Federal tax is deferred until redemption, and interest is exempt from state and local income tax. Interest used for qualified higher education expenses may be excludable from federal tax if your income is below the annual phase-out thresholds. This article is educational, not tax advice — check current IRS guidance for your situation.

Rate figures in this article come from the Treasury’s October 30, 2026 announcement as reported by TIPSWatch, USA Today, and Wolf Street; verify the current rate on TreasuryDirect.gov before buying, since rates reset every May 1 and November 1.