A detailed entry on Series I Bonds, which are savings bonds designed to protect the purchasing power of investments and provide a guaranteed real rate of return.
Series I Bonds are accrual-type securities issued by the U.S. Department of the Treasury. They are designed for investors seeking to protect the purchasing power of their investment while earning a guaranteed real rate of return. These bonds are sold at face value and their principal increases with inflation-indexed earnings for up to 30 years.
The fixed rate of a Series I Bond is established by the U.S. Treasury and applies to the bond for its entire life. This rate is announced semi-annually in May and November, and remains constant for bonds purchased in the following six-month period. The fixed rate component offers a guaranteed minimum return on the investment, separate from the variable inflation adjustment.
The variable semi-annual inflation rate is determined by changes in the non-seasonally adjusted Consumer Price Index for all Urban Consumers (CPI-U). This rate adjusts every six months to reflect inflation, ensuring the bond’s value keeps pace with rising prices.
The formula to compute the composite earnings rate is:
Series I Bonds can be purchased directly through TreasuryDirect accounts or through participating financial institutions, including banks and credit unions. The minimum purchase amount is typically $25 when buying electronically, with a maximum annual purchase limit per individual.
Interest accrues monthly and is compounded semi-annually. Bondholders can start cashing in their bonds one year after purchase; however, bonds redeemed within the first five years forfeit the last three months of interest. After five years, there is no penalty for redeeming the bonds. The maximum duration for holding a Series I Bond is 30 years.
Interest earned from Series I Bonds is subject to federal income tax but exempt from state and local taxes. Taxes can be reported annually or deferred until redemption, whichever suits the investor’s tax planning strategy.
Both Series I Bonds and TIPS are designed to protect against inflation. While Series I Bonds have both a fixed and a variable inflation component, TIPS adjust both their principal and interest payments in response to inflation. TIPS are also marketable securities unlike Series I Bonds, which are non-marketable and must be held until redemption.
See also [Treasury Inflation-Protected Securities (TIPS)], which offer a similar way to hedge against inflation but with different structural and market characteristics compared to Series I Bonds.
By understanding and leveraging Series I Bonds, investors can safeguard their financial future against inflationary pressures while enjoying the stability and security provided by government-backed securities.