Money · April 13, 2026

Treasury bills vs CDs in 2026: which one wins for cash savings

T-bills vs CDs in 2026 — which actually pays more after taxes, where to buy each, and when one beats the other.

By ByteLedger Team

Both T-bills and CDs are essentially the same product: you give the issuer money, they give it back with interest on a fixed date. The differences look small but compound into real dollars depending on where you live and how flexible you need to be.

This guide does the after-tax math, names where to buy each, and tells you which wins in the most common situations in 2026.

What changed in 2026

A few details matter when you're choosing between the two.

T-bill auctions are easier than ever. TreasuryDirect's interface is still ugly but works, and most brokers will buy them for you commission-free.
Brokered CDs got more competitive. Schwab and Fidelity routinely list CDs that match or beat T-bills on headline rate.
Bank CD penalties got stiffer. Some banks now charge 6 months of interest for early withdrawal on a 12-month CD. Read the fine print.

How we picked

We weighted what determines after-tax return and flexibility.

Headline yield
State tax exemption (T-bills only)
Liquidity / early withdrawal cost
Where to buy — friction matters
FDIC vs Treasury backing — both fully safe, technically different

1. T-bills — best for state-tax-burdened savers

T-bills are obligations of the US Treasury, exempt from state and local income tax. If you live in California, New York, or another high-tax state, that 5–10% effective tax savings often outweighs a slightly lower headline rate vs a CD.

Buy them at TreasuryDirect (no fee, slightly clunky) or any major broker (no fee, much nicer interface). Auctions happen weekly for 4-, 8-, 13-, and 26-week durations.

2. Brokered CDs — best for hands-off laddering at scale

Schwab, Fidelity, and Vanguard all sell CDs from dozens of banks at fixed terms. They're FDIC-insured up to $250k per bank, settle like bonds, and you can sell them on the secondary market if you need to (at market price, which may be less than face).

The catch: if you sell early, you get whatever a buyer will pay, not your principal. Don't confuse "liquid" with "no loss."

3. Bank CDs — best when promotional rates beat both

Occasionally a credit union or online bank will run a promo CD that beats both T-bills and brokered CDs after tax. They exist; they're not common in 2026; and they usually have early-withdrawal penalties measured in months of interest.

Comparison: T-bills vs CDs in April 2026

Product	Yield (approx)	State tax?	Liquidity	Best for
4-week T-bill	~4.4%	Exempt	Mature in 4 wks	High-tax states
26-week T-bill	~4.5%	Exempt	Mature in 6 mo	Locked rate, tax-friendly
6-month brokered CD	~4.6%	Taxable	Sell at market	No-state-tax savers
12-month bank CD	~4.5%	Taxable	Penalty to break	Promo rate hunters
HYSA	~4.2%	Taxable	Daily	Emergency cash

Common mistakes to avoid

Comparing yields pre-tax. A 4.6% CD in California is worth ~4.2% after state tax. A 4.5% T-bill is worth 4.5%. Always compare net.

Laddering badly. Buying ten 4-week T-bills doesn't beat one 26-week T-bill if rates are flat. Match maturity to when you'll actually need the money.

Forgetting reinvestment risk. A 4-week T-bill rolls into the next auction's rate, which may be lower. A 12-month CD locks today's rate.

FAQ

Are T-bills safer than CDs? Both are essentially as safe as it gets. Treasuries are backed by the US government; CDs by FDIC up to $250k per bank.

Where do I buy T-bills? TreasuryDirect.gov for direct buys, or any major broker (Fidelity, Schwab, Vanguard) which is much easier and still free.

Can I lose money on a T-bill? Not if you hold to maturity. If you sell early on the secondary market and rates moved against you, the price will be slightly off par.