I Bonds Now Pay 5.51%: Should You Buy One?

Yesterday the US Treasury announced the new Series I savings bond rate, and it is a blockbuster: I Bonds issued from November 1, 2026 through April 30, 2027 will earn a 5.51% composite rate (annualized) for their first six months. That beats today's best high-yield savings accounts and CDs — and it comes with a fixed rate that is the highest in 20 years. If you have been sitting on spare cash, this deserves your attention this week.

What the 5.51% actually means

An I Bond's rate is really two rates stitched together. Both were reset on October 30, 2026:

Component	New rate (Nov 2026 – Apr 2027)	Previous rate	What it is
Fixed rate	1.40%	0.90%	Set by the Treasury; stays with your bond for its full 30-year life
Inflation (variable) rate	4.08% (annualized)	3.34%	Resets every six months based on CPI inflation; covers April–September 2026 inflation (2.04%)
Composite rate	5.51% (annualized)	4.26%	What you actually earn for the first six months after purchase

The math is a touch subtler than simple addition (the composite formula also folds in their interaction), but the headline number is what matters — and especially the 1.40% fixed rate, the highest since November 2006, according to TIPSWatch founder David Enna.

Why the fixed rate matters most: the inflation part changes every six months, but the 1.40% fixed rate is locked in for the entire life of any bond you buy before May 2027. Bonds bought later may carry a lower fixed rate.

The 5.51% composite only applies for the first six months after your purchase. After that, your bond keeps the 1.40% fixed rate and picks up whatever the new inflation rate is, recalculated every six months. If inflation cools, your yield falls; if it runs hot, your yield rises. That is the bargain: real, inflation-protected purchasing power, whatever the economy does.

How I Bonds work: the rules that matter

• Sold only at TreasuryDirect.gov. You cannot buy them through a broker or an app — just the US Treasury's own website.
• $10,000 per person per calendar year. The limit is per Social Security number and resets on January 1. Gift bonds count toward the recipient's limit, not yours, so a couple can each buy $10,000 and gift bonds to each other to buy more.
• Minimum $25. There is no barrier to starting small.
• Locked for 12 months. You cannot touch the money at all in the first year — no exceptions. Do not put money here that you might need sooner.
• Penalty before 5 years. Redeem between years 1 and 5 and you forfeit the last three months of interest. Hold past five years and there is no penalty.
• 30-year bonds. Interest compounds and is added to the principal; they stop earning after 30 years.
• Taxes. Interest is subject to federal income tax but exempt from state and local taxes. You can defer the tax until you cash in (you will get a Form 1099) or report it annually.

Who should buy — and who should skip

Good candidates: savers with cash in a low-rate account they will not need for at least a year; anyone wanting inflation protection for medium-term goals; grandparents buying in a child's name (the child gets their own separate $10,000 limit).

Should skip: anyone who might need the money within 12 months; anyone hoping to "time" rates — the variable half resets every six months regardless.

Do not buy before November 1. October-issued bonds locked in the old terms — 0.90% fixed, 4.26% composite. Tomorrow's bonds carry the new 1.40% fixed rate for their entire life. That gap is the reason to buy now.

The timing trick: buy late in November

I Bonds earn a full month's interest no matter which day of the month you buy. A bond purchased on November 28 earns the same November interest as one bought on November 2.

I Bonds vs the other safe places for cash

How does 5.51% stack up against today's best alternatives? All figures are from this month's reporting:

Option	Current rate	Access	Tax
I Bonds (Nov 2026)	5.51% (first 6 months)	Locked 12 months; penalty to 5 yrs	Federal only (state/local exempt)
Top high-yield savings accounts	~5.00% APY	Instant	Fully taxable
Top CDs	4.50–5.25%	Locked for term	Fully taxable
Treasury bills	~4.11%	Traded / hold to maturity	Federal only

The I Bond wins on rate and on tax treatment — the state/local tax exemption is a quiet edge over savings accounts and CDs. What it cannot match is flexibility. The sensible answer for many is both: an HYSA for the true emergency fund, I Bonds for the next layer of savings you can lock up.

Frequently asked questions

Can I buy I Bonds inside a retirement account or through my bank?

No. I Bonds are sold only through TreasuryDirect.gov accounts in your own name — not in an IRA or 401(k), and not through a bank.

What happens if inflation falls — can the rate go below zero?

The composite can never go below 0% and your bond can never lose nominal value. If inflation turns negative, the inflation component can drag the composite to 0% for a six-month stretch — but not below, and the fixed 1.40% resumes when inflation returns.

How do gift I Bonds work toward the annual limit?

A gift bond counts toward the recipient's $10,000 annual limit, not the giver's. This is a legitimate way for a household to buy more than $10,000 in a year — for example, each spouse buys $10,000 in their own name plus gift bonds in the other's name, delivered in a later year.

Is the 5.51% guaranteed for a year?

No — for six months. Your bond's rate changes every six months from its issue month as the inflation rate resets. Only the 1.40% fixed portion is locked for the bond's life.

What about EE Bonds — did they change too?

Yes. EE Bonds bought from November 2026 through April 2027 carry a fixed 2.90% rate, up from 2.40% — a different product, better suited to very long-haul savers because of their 20-year doubling guarantee.

I Bonds rarely look this good — a top-beating headline rate plus a historically high locked-in fixed rate. If you have spare savings, no near-term need for them, and have not used your 2026 $10,000 allowance, this is the week to act: open a TreasuryDirect account and plan your purchase for late November.