This New Investment Just Delivered Retirement Savers Their Best Inflation Protection in 20 Years

Inflation can make a retirement budget feel like it’s moving backward even when income goes up. Social Security’s 3.6% cost-of-living adjustment for 2027 will give beneficiaries a bigger check, but the increase follows a national inflation measure. 

Your grocery bill, insurance premiums, and other expenses can move at a different pace. Some beneficiaries could also owe federal tax on more of their Social Security income as their checks grow. That makes the savings you plan to spend several years from now a separate challenge. You want that money to keep its buying power while it waits. The latest investment from the U.S. Treasury Dept. gives retirement savers a way to do just that.

A New Savings Bond Tells Only Half the Story

Treasury’s new Series I savings bonds issued from November 2026 through April 2027 earn interest at a 5.51% annual rate for the first six months. That works out to about $276 in interest on a $10,000 bond before the rate resets, and is up from 4.26% for bonds issued from May through October. The important number worth circling, though, is 1.40% — that is the fixed rate on the bond you keep for as long as you own it, up to 30 years. The last time a new I bond offered a fixed rate that high was in November 2006, according to TreasuryDirect’s rate history.

The attractive part of an I bond is that it combines that fixed rate with an adjustment tied to the Consumer Price Index for All Urban Consumers. Treasury updates the inflation component every six months, so the combined rate can rise or fall. The new fixed rate, however, gives the bond a lasting edge over an older I bond with a lower fixed rate. 

Say you bought one in October at 0.90%. Once both bonds are earning the same inflation adjustment, the November bond still earns more because its fixed rate is half a percentage point higher. Where the new bond gives $276 in interest for the first six months, the older one will see $213, a $63 difference. That advantage survives long after the 5.51% opening rate expires.

Give the Money a Job Before You Buy

The first thing to check is when you’ll need the cash. TreasuryDirect requires you to hold an I bond for at least 12 months. Cash it in before five years, and you give up the last three months of interest. That makes a high-yield savings account or short-term Treasury bills a better fit for money you might need on short notice. The I bond is better suited to a future expense you can afford to wait on.

The purchase limit also helps define its role. TreasuryDirect generally caps electronic I bond purchases at $10,000 per person per calendar year, so two spouses can generally buy $20,000 between them. Interest is exempt from state and local income taxes, and you can generally defer reporting it for federal income tax until you redeem the bond or it matures. That gives you some control over when the income shows up on your return, a detail worth checking if your income is near a Medicare premium surcharge threshold.

Key Takeaway

If you already have enough cash for emergencies and know you can leave some savings alone for five years or more, consider putting a portion into the new I bonds. Start with the expense you’re saving for and work backward to the amount you can set aside. The appeal is what you get to keep after that first six months. Even if inflation cools and the headline rate falls, you’ll still own an I bond with the strongest fixed rate Treasury has offered in 20 years.

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