I Bonds Explained: Why the Holding Period Matters

Series I savings bonds combine a fixed interest component with an inflation component. The combined rate can change, so an advertised rate is not a promise that the same overall rate lasts for the life of the bond. Access rules matter just as much as the rate.

How does the interest rate work?

TreasuryDirect says the fixed component does not change for the bond, while the inflation component resets every six months. The combined rate can rise or fall. Interest accrues monthly and compounds semiannually.

You receive the interest with the money when the bond is redeemed, rather than as regular cash payments to spend along the way. Review the rules for the bond's issue period rather than borrowing the rate shown for a different purchase date.

When can you get the money back?

Under TreasuryDirect's standard rules, you can redeem an I bond after twelve months. If you redeem before five years, you forfeit the last three months of interest.

For example, TreasuryDirect explains that redemption after eighteen months pays the first fifteen months of interest. That makes an I bond different from money you can freely withdraw next week. Plan around the access restriction before moving cash you might need for a bill or unexpected expense.

What other details should you review?

TreasuryDirect currently offers I bonds electronically, with a twenty-five-dollar minimum purchase. It lists an annual electronic purchase limit of ten thousand dollars per Social Security number or employer identification number, with registration details affecting how the limit applies.

Earnings are subject to federal income tax but not state or local income tax. Reporting choices and possible education-related treatment have conditions; use TreasuryDirect's tax guidance and professional advice for your situation. This explanation is about mechanics, not a recommendation to buy a particular issue.

Frequently asked questions

Can I use an I bond as immediately accessible emergency cash? The standard twelve-month redemption restriction makes that a poor assumption.

Does today's combined rate stay fixed forever? No. The fixed component stays, but the inflation component resets and changes the combined rate.

Sources and further reading: TreasuryDirect, I Bonds (https://www.treasurydirect.gov/savings-bonds/i-bonds/).