I keep cash in both: brokered CDs for rate-chasing and T-bills for flexibility. People ask which ladder is better, and I have stopped giving a single answer, because the right choice hinges on one thing most comparisons bury: your state income tax bracket. Here is the CD ladder vs Treasury bond ladder decision the way I actually make it.
The after-tax math, with a $50,000 example
Take $50,000, a 4.35% CD, and a 4.20% Treasury yield (illustrative late-2026 rates; check current offers before deciding). Say you are in the 22% federal bracket and live in California at 9.3% state tax. CD interest is taxed at both levels: 4.35% times (1 minus 0.313) is 2.99% after tax. Treasury interest is exempt from state tax: 4.20% times (1 minus 0.22) is 3.28%. The Treasury wins by about 0.3 points, roughly $145 a year on $50,000. Now move to Texas, with no state income tax: the CD pays 4.35% times 0.78, or 3.39%, against the Treasury's 3.28%. The CD wins by about $55 a year. Same instruments, different winner. The tax bracket is the tiebreaker, and most headline comparisons never run this math.
Four differences beyond the yield
Backing and limits. CDs are FDIC-insured to $250,000 per depositor per bank; spread across banks for more. Treasuries carry the full faith and credit of the US government with no cap at all. Parking more than $250,000? The Treasury side of this comparison gets simple fast.
Liquidity. T-bills sell on any business day at near-par value. CDs charge early-withdrawal penalties, typically 3 to 12 months of interest. If the cash might need to move on short notice, that difference matters more than a tenth of a point of yield.
Terms. T-bills top out at 52 weeks, though Treasury notes extend the ladder further. CDs ladder out to 5 or 10 years easily, which is the whole point if you are locking in rates for the long haul.
Friction. Brokerage auto-roll makes a T-bill ladder nearly maintenance-free: maturing bills roll into the next auction by themselves. A CD ladder means tracking maturities across institutions and directing each one by hand. (Minor point in the other direction: CDs compound; T-bills don't. It moves the needle slightly toward CDs.)
CD ladder vs Treasury bond ladder: my rule of thumb
Live in a high-tax state, California, New York, New Jersey, Oregon, Minnesota, or Hawaii, or have more than $250,000 to park: build the Treasury ladder. Live in a no-income-tax state and stay under the FDIC cap: chase the best CD rate and keep it simple. Can't decide: run the hybrid. T-bills on the short end where liquidity matters most, CDs in the middle where credit-union rates beat Treasury yields. Model both on your numbers before opening anything, because the winner changes with your bracket, and your bracket is the one input the rate tables can't see.
Brokered CDs vs bank CDs in a ladder
Two ways to buy the rungs. Bank CDs come from the bank directly, renew or mature into your account there, and charge an early-withdrawal penalty if you break them. Brokered CDs are bought through a brokerage, which means one account can hold CDs from many banks, and if you need out early you sell on the secondary market instead of paying a penalty. The catch: the sale price moves with interest rates, so you can take a loss. For a ladder you intend to hold to maturity, brokered CDs are usually simpler to manage. For money you might actually need early, a bank CD's fixed penalty is more predictable than a market sale.
The reinvestment risk nobody mentions
Every ladder article celebrates locking in rates, and then quietly skips what happens at maturity: your rung comes due and the best available rate is a point lower. In a falling-rate market, the ladder's long rungs are the defense and the maturing short rungs are the exposure, which is exactly why weighting toward the long end matters now. One more trap to check before you buy: callable CDs. Some brokered CDs let the bank redeem them early if rates fall, which is precisely when you most want to keep your rate. A callable CD in a falling-rate environment is a ladder rung that can vanish. Check the terms; non-callable is worth a slightly lower yield.
Frequently asked questions
Is Treasury bond interest exempt from state tax?
Yes. Interest on US Treasury securities is exempt from state and local income tax. That exemption is the entire reason Treasuries can beat higher-yielding CDs after tax.
Which pays more right now, CDs or Treasuries?
Nominally, CDs often edge out. After state tax, Treasuries frequently win in high-tax states. Check live rates and run the after-tax math above instead of comparing headlines.
Are brokered CDs as safe as Treasury bonds?
For practical purposes, yes. CDs carry FDIC insurance to $250,000 per depositor per bank; Treasuries carry direct US government backing with no cap.
Can I automate a Treasury ladder?
Yes. Fidelity and Schwab both offer Treasury auto-roll, where maturing T-bills automatically buy into the next auction. It is about as close to set-and-forget as fixed income gets.
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