6-Month CD Ladder (Semi-Annual Rungs, May 2026)

The 6-month CD has been the highest-paying conventional CD tier through much of 2025 and 2026. As of May 2026 the top 6-month rate at Bread Financial and BMO Alto is 4.30% APY, ten basis points above the 1-year top rate and forty basis points above the 2-year top rate. That inversion is unusual historically (the yield curve typically slopes upward) and reflects the market's expectation of further Federal Reserve cuts. The 6-month CD ladder is one way to participate in that elevated short rate without committing all your cash to a single six-month term.

6-month rungs also make sense when you are uncertain about the direction of rates. Twice-yearly maturities let you average into the prevailing rate environment without locking yourself into a single moment in time. If the Fed surprises with no cuts, your matured rungs roll at similar rates to today. If the Fed accelerates cuts, your unmatured rungs (12, 18, 24 months) continue earning the higher rates you locked in. The structure is a hedge against rate uncertainty in both directions.

The case against 6-month rungs is operational overhead. Every six months you face a reinvestment decision. That is twice the decision frequency of an annual ladder. For savers who find CD shopping tedious, the lower-overhead annual ladder is usually the better choice despite leaving some short-end yield on the table. See our 12-month ladder design for the lower-frequency alternative.

A Treasury bill ladder uses 13-week, 26-week, and 52-week T-Bills bought at auction through TreasuryDirect or a brokerage. T-Bills are sold at a discount and pay face value at maturity; the difference is your interest. Current auction rates per the TreasuryDirect rate page sit around 4.05% on the 13-week and 4.00% on the 26-week as of May 2026, slightly below the top CD rates at the same terms.

The decisive factor is state income tax. Treasury bill interest is exempt from state and local income tax. CD interest is fully taxable at the state level. For a saver in California (top state rate 13.3% but effectively roughly 9.3% for most middle and upper-middle earners), the T-Bill ladder usually delivers higher after-tax income despite the lower headline yield. For a saver in Florida or Texas (no state income tax), the CD ladder wins on raw yield without any after-tax adjustment. For middle-tax states like New York (6.85%) and Massachusetts (5.0%), the two are usually within a handful of basis points of each other after tax.

T-Bills also win on liquidity in one specific way: they are tradeable on the secondary market through any brokerage. You can sell before maturity at the prevailing market price (which may be above or below your purchase price depending on rate moves since auction). CDs cannot be sold; they can only be closed early with a penalty. See our full CD vs Treasury bills comparison for the after-tax math across all 50 states.

The Federal Reserve cut the federal funds rate to 3.50% to 3.55% by early 2026 and the FOMC dot plot from the March 2026 meeting suggests another 25 to 50 basis points of cuts by year end. CD rates broadly follow the federal funds rate with a lag of one to three months. A 50 basis point cut by August 2026 would likely push top 6-month CD rates from 4.30% to roughly 3.80% to 3.90% by October.

Concretely: the 6-month rung you open today at 4.30% matures in November 2026. If you reinvest into a fresh 6-month CD at 3.85% (the post-cut rate), your second cycle earns 3.85% instead of 4.30%. On $7,500 the difference is roughly $17 over the second six months. That is small in absolute terms but it adds up across rungs and cycles. Plan for a steady decline in reinvestment APY through 2026 and 2027 if the Fed follows the dot plot. The 12-month and 18-month rungs in this ladder are protected because they lock today's rate for their full term.

The opposite scenario is also worth considering: if inflation reaccelerates and the Fed pauses or reverses, the 6-month rung that matures in November 2026 reinvests at a similar or higher rate than today. The ladder participates in either outcome, which is the structural value of the design. You are not betting on a specific Fed path; you are positioned to react to whatever path materializes.

CD interest is credited and taxed when paid. A 6-month CD opened in May 2026 pays interest at maturity in November 2026; that full amount counts as 2026 ordinary income on your 1040. A 6-month CD opened in November 2026 pays interest at maturity in May 2027; that amount counts as 2027 income. The semi-annual ladder produces 1099-INT forms in both years because the rung cycles straddle the calendar year boundary.

The 12, 18, and 24 month rungs each generate their own 1099-INT in the year they mature. If you use four different banks you receive four separate forms; if you use one bank for the entire ladder, you receive a single consolidated form. Either way, total interest is reported on Schedule B if it exceeds $1,500. IRS Pub 550 at irs.gov/forms-pubs/about-publication-550 is the official reference. See our CD interest taxation page for federal and state mechanics.