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In this guide, we explain how the I bond rate actually works, what is already known about the November 1 reset (and what is still only a prediction), the dollar math for buying now versus waiting on a $10,000 purchase, the rules that should decide the question for you, and who should do what. Every current figure comes from TreasuryDirect's May 2026 rate announcement and the Bureau of Labor Statistics CPI data; every November figure is clearly labeled as a forecast from TIPSWatch and the USA Today Network — not a Treasury announcement.
An I bond's rate has two parts. The fixed rate is set when you buy and never changes for the life of the bond. The inflation rate resets every six months based on the Consumer Price Index (CPI-U) and applies to all I bonds, old and new. Treasury combines them with a formula — fixed rate + (2 × semiannual inflation rate) + (fixed rate × semiannual inflation rate) — into the composite rate.
For I bonds issued May 1 through October 31, 2026, TreasuryDirect confirms:
| Component | Current rate | Notes |
|---|---|---|
| Fixed rate | 0.90% | Locked for the bond's 30-year life if you buy by Oct 31 |
| Semiannual inflation rate | 1.67% | 3.34% annualized; based on CPI-U Sept 2025 → Mar 2026 |
| Composite rate | 4.26% | Applies for the first six months after your purchase |
Interest accrues monthly and compounds semiannually. I bonds are sold only through TreasuryDirect, only electronically since January 1, 2025, with a $25 minimum and a $10,000 annual purchase limit per Social Security number. You cannot cash in during the first 12 months, and cashing in before five years forfeits the last three months of interest. Interest is exempt from state and local tax and federally tax-deferred until you redeem.
Two things reset on November 1 — and one of them is already calculable while the other is still a forecast:
Combining the two: a 1.30% fixed rate with a 4.08% annualized inflation rate gives a composite rate of about 5.41%; a 1.40% fixed rate gives about 5.51%. Note the honest disagreement in the press: USA Today and the Detroit Free Press, writing before the September CPI release, quoted Enna's earlier variable-rate estimate of 3.58% and a composite of about 4.9%. The post-release CPI math (4.08%) supersedes that earlier estimate — but the fixed-rate half remains a forecast until Treasury announces it on November 1.
| Buy by Oct 31, 2026 | Buy Nov 1, 2026 – Apr 30, 2027 (predicted) | |
|---|---|---|
| Fixed rate (locked for life) | 0.90% | 1.30% (predicted; 1.40% possible) |
| First-six-months composite | 4.26% | about 5.41% (predicted) |
| Second-six-months composite | about 5.00% (0.90% fixed + new 4.08% inflation) | Unknown — resets May 1, 2027 |
One subtlety new buyers miss: buying in October does not lock you out of the new inflation rate. Your October bond earns 4.26% for six months, then picks up the new 4.08% inflation rate (with your 0.90% fixed rate) for the next six months — about 5.00%. What an October purchase permanently misses is only the higher fixed rate, not the higher inflation rate. The fixed rate is the whole ballgame in this decision, because it is the one part that never resets.
Here is what the two paths look like in dollars, using the predicted November figures (labeled as predictions throughout):
| Path | First 6 months | Next 6 months | First-year interest (approx.) | Fixed rate for life |
|---|---|---|---|---|
| Buy $10,000 in October | 4.26% → about $213 | about 5.00% on $10,213 → about $255 | about $468 | 0.90% |
| Wait and buy $10,000 in November | about 5.41% (predicted) → about $270 | Unknown (May 2027 reset) | Unknown, but first half is about $57 ahead | 1.30% (predicted) |
The long-run difference is the fixed rate: 1.30% versus 0.90% is 0.40 percentage points a year, every year, for up to 30 years — about $40 a year per $10,000, compounding, if the prediction holds. Over a decade-plus holding period, that dwarfs the first-six-months gap. That is why TIPSWatch's verdict is blunt: unless something unexpected happens, waiting until November is the better move for money you were going to put into I bonds anyway.
There is one timing wrinkle worth knowing: a November purchase still counts against your 2026 $10,000 annual limit, because the limit follows the calendar year of purchase, not the rate period. If you have already bought $10,000 in 2026, waiting does not help you this year — your next window opens January 1, 2027, when the limit resets (and the November rate period is still in effect through April 2027).
The rate math favors waiting, but the rules — not the rate — should make your decision:
For context, here is how I bonds stack up against the other safe-cash options we covered this month:
The clean rule: savings for money you might need soon, CDs for money with a known date, I bonds for long-horizon inflation-protected cash. Most savers with all three goals should hold all three — not pick a single winner.
For I bonds issued May 1 through October 31, 2026, the composite rate is 4.26% — a 0.90% fixed rate plus a 1.67% semiannual inflation rate (3.34% annualized). The next rate is announced November 1, 2026.
For most long-horizon savers, waiting looks better: the November inflation rate is already calculable at 4.08% annualized from released CPI data, and the fixed rate is predicted to rise to about 1.30% (from 0.90%), giving a predicted composite near 5.41%. But the fixed rate is a forecast, not an announcement — and if you need the money within a year, buy neither; use a savings account instead.
Up to $10,000 in electronic I bonds per person per calendar year, bought only through TreasuryDirect.gov (electronic only since January 1, 2025). Minimum purchase is $25. Trusts and businesses with their own taxpayer ID have their own $10,000 limits.
You cannot redeem at all in the first 12 months. Redeem before five years and you forfeit the last three months of interest. After five years there is no penalty, and bonds earn interest for up to 30 years.
The inflation half is arithmetic from released CPI data, so it is solid. The fixed-rate half is an expert forecast based on Treasury's historical pattern (roughly 0.65 × the average five-year TIPS real yield). It has worked well for a decade, but Treasury is not bound by it — the November 1 announcement is the only certainty.
October 2026 is a rare month where waiting is the analytically better move: the November I bond rate is predicted at about 5.41% (versus 4.26% today), built on a calculable 4.08% inflation rate and a forecast 1.30% fixed rate that would stay with the bond for up to 30 years. If you are a long-horizon saver who has not used your 2026 $10,000 limit, waiting until November 1 is the strong play — and a November purchase still counts toward your 2026 limit. If you need certainty, or the money might be needed within a year, the answer is different: buy now only if the money is truly long-term, and keep short-horizon cash in a savings account instead. Either way, confirm the announced rate on TreasuryDirect on November 1 before you act — predictions, however good, are not announcements.
Sources: TreasuryDirect, "I bonds interest rates" (current composite 4.26%, fixed rate 0.90%, issue window May 1 – October 31, 2026) and Fiscal Service rate announcement, May 1, 2026 (CPI-U 324.8 in September 2025 → 330.213 in March 2026, six-month change 1.67%); Bureau of Labor Statistics September 2026 CPI release (September CPI-U 336.940; April–September 2026 change 2.04%) via TIPSWatch, October 14, 2026 (new variable rate 4.08%; fixed-rate forecast 1.30%, 1.40% possible; predicted composite about 5.41%); USA Today Network / Detroit Free Press, October 2026 (Enna: 1.30% most likely; earlier pre-CPI variable estimate 3.58%, composite about 4.9% — superseded by post-release CPI math); YourBestSavings I bond rate page (composite formula; $10,000 annual limit; 12-month lock; 3-month penalty); MoneyVersus, October 2026 (Ally 3.10% APY). November figures are forecasts, not Treasury announcements — confirm on TreasuryDirect.gov on November 1, 2026.
Disclaimer: This article is for educational purposes only and is not financial or investment advice. I bond rates reset every six months, November 2026 figures cited here are third-party forecasts (not Treasury announcements), and tax treatment depends on your situation. Confirm the announced rate on TreasuryDirect.gov — or speak with a licensed financial professional — before buying.
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