When policy rates were rising fast, almost any short Treasury or I Bond looked brilliant next to a 0.01% savings account. After yield-curve normalization, the decision is finer: Series I savings bonds still blend a fixed rate with inflation, while T-bill ladders lock in auction yields with unmatched liquidity at maturity. Cash investors need a sleeve map, not a slogan.
I Bonds purchased through TreasuryDirect earn a composite rate that resets every six months. They are exempt from state and local income tax, and federal tax can be deferred until redemption. The catch is liquidity: you cannot redeem in the first year, and redemptions in the first five years forfeit the prior three months of interest.
That liquidity lock is the feature people forget when they chase last period’s composite rate. Money you might need for a deductible, a job gap, or a home repair does not belong in a product you cannot touch for twelve months.
How T-bill ladders behave now
A ladder of 4-week to 52-week bills bought at auction (or via a brokerage) turns maturities into predictable cash. Yields move with each auction; you reinvest or spend as bills roll. There is no early-redemption interest penalty like I Bonds, though selling before maturity in the secondary market can produce a small gain or loss.
For emergency funds you might need inside twelve months, bills—or a high-yield savings/money-market fund—usually beat I Bonds because of the one-year lock. For a slice of cash you can truly strand for a year or more, I Bonds can still hedge unexpected inflation spikes that bills do not.
Brokerage T-bill purchases are often easier operationally than TreasuryDirect for investors who already custodied assets there. Compare state tax treatment, sweep yields on uninvested cash, and whether your broker passes through auction access cleanly.
Annual I Bond purchase limits ($10,000 electronic per Social Security number, plus narrow paper options via tax refund) cap how much of a large cash pile you can park there. T-bill ladders scale. State-tax exemption on I Bonds matters more in high-tax states; in no-income-tax states the edge shrinks.
- Horizon under 12 months: Prefer bills, HYSA, or government money markets.
- Horizon 1–5 years with inflation worry: Consider a capped I Bond sleeve.
- Rate-cut expectations: Longer bills lock yields; I Bond fixed components also lock but composites still reprice with inflation.
- Ops: TreasuryDirect UX is clunky—set calendar reminders for holdings.
Re-evaluate every six months when I Bond composites reset and when bill auctions move. Do not anchor on a friend’s purchase rate from last year. Build a written policy: target percentages for liquid cash, I Bonds, and longer Treasuries, then rebalance with new savings rather than constant selling.
A clean 2026 cash architecture for many households is barbelled: liquid bills or cash funds for true emergencies, a modest I Bond allocation for inflation insurance, and no chasing last year’s composite rate after it has already reset lower. Re-read the current fixed and inflation components before you buy—yesterday’s brochure rate is not today’s.
Yield normalization rewards process over nostalgia. Match liquidity to the job of the money, then pick the instrument. The right answer is usually a mix sized to your calendar—not a single product crowned “best yield.” Keep a one-page cash policy and update it when income or major expenses change, not when headlines change.
