10-Year Treasury At 4.40%: The Complete Playbook For CDs, HYSAs, T-Bills And I-Bonds In May 2026

The yield environment for US savers in May 2026 is historically unusual. The 10-year Treasury is at 4.40%. Top-tier online high-yield savings accounts are paying 4.40% to 4.85% APY. Twelve-month brokered CDs are offering 4.85% to 5.00%. Four-week Treasury bills are yielding 4.45%. Money market funds are paying 4.30% to 4.50% with daily liquidity. For nearly two decades — essentially the entire post-2008 era — US savers were told that any meaningful yield required taking equity-like risk. That is no longer true.

But the headline rates only tell part of the story. The right vehicle for any given dollar depends on your tax situation, your liquidity needs, your time horizon, and your willingness to manage multiple accounts. This article is the complete, current, side-by-side playbook for every major cash vehicle: high-yield savings, certificates of deposit, Treasury bills, money market funds, I-Bonds, and brokered CDs. It includes the after-tax math that reshuffles the rankings for households in California, New York and other high-tax states, and the specific step-by-step setup for the most efficient cash allocation in May 2026.

Where Yields Actually Are Right Now (May 5, 2026)

Before getting into strategy, here is the current yield landscape across every major cash vehicle. All rates are as of the first week of May 2026 and reflect what is actually available to retail savers — not promotional rates that disappear after 30 days.

High-Yield Savings Accounts (Liquid, FDIC-Insured)

• Wealthfront Cash Account: 4.85% APY (4.50% base + 0.35% promo, partner banks, $0 minimum)
• BMO Alto Online Savings: 4.75% APY ($0 minimum, no monthly fees)
• Marcus by Goldman Sachs Online Savings: 4.50% APY ($0 minimum, established brand)
• Ally Bank Online Savings: 4.40% APY ($0 minimum, strong app, integrated checking)
• Apple Card Savings (via Goldman Sachs): 4.40% APY ($0 minimum, requires Apple Card)
• Discover Online Savings: 4.40% APY ($0 minimum, no fees)
• Capital One 360 Performance Savings: 4.10% APY ($0 minimum, branch access)
• Big-bank savings (Chase, BofA, Wells Fargo): 0.01-0.05% APY — never use these for cash

Certificates of Deposit (Locked-In Rate, FDIC-Insured)

• 12-month brokered CDs (via Schwab, Fidelity, Vanguard): 4.85-5.00% APY
• 12-month direct bank CDs (BMO, Marcus, Synchrony): 4.65-4.85% APY
• 6-month CDs: 4.75-4.95% APY (best risk-adjusted lock for shorter horizons)
• 24-month CDs: 4.30-4.55% APY (yield curve still mildly inverted in this region)
• 60-month CDs: 4.00-4.25% APY (locking 5 years of low rates is risky if rates rise)
• Penalty for early withdrawal: typically 90-180 days of interest on the withdrawn amount

Treasury Bills (State Tax-Free, Backed By US Government)

• 4-week T-bill: 4.30-4.40% (rolled monthly, ultra-short)
• 8-week T-bill: 4.35-4.45% (the sweet spot for short-term liquidity)
• 13-week T-bill: 4.40-4.45%
• 17-week T-bill: 4.40-4.50%
• 26-week T-bill: 4.30-4.40% (slight inversion vs shorter maturities)
• 52-week T-bill: 4.25-4.35%
• Buy directly at TreasuryDirect.gov ($100 minimum) or through a brokerage account

Money Market Funds (Brokerage Sweep, Daily Liquidity)

• Vanguard Federal Money Market (VMFXX): 4.45% 7-day yield
• Fidelity Government Money Market (SPAXX): 4.30% 7-day yield
• Schwab Value Advantage Money Fund (SWVXX): 4.50% 7-day yield
• Vanguard Treasury Money Market (VUSXX): 4.45% yield, 80%+ state-tax-exempt
• Fidelity Treasury Only Money Market (FZFXX): 4.20% yield, fully state-tax-exempt

I-Bonds (Inflation-Linked Treasury Bonds)

• Current composite rate (May 1, 2026 to October 31, 2026): 3.98%
• Fixed-rate component: 1.40% (locked for 30 years)
• Variable inflation-rate component: 2.55% (resets every 6 months)
• Annual purchase limit: $10,000 per person electronic, plus $5,000 paper via tax refund
• Cannot be redeemed in first 12 months; 3-month interest penalty if redeemed within 5 years

The Tax Math That Reshuffles The Rankings

Most yield comparison articles stop at the headline APY. That is a mistake for any household in a high-state-tax jurisdiction. Treasury-issued securities (T-bills, Treasury notes, and the Treasury portion of certain money market funds) are exempt from state and local income tax. A 4.45% Treasury bill is meaningfully more attractive than a 4.85% CD for a household paying 9.3% California state income tax — once the after-tax math is run.

The Specific After-Tax Comparison

Consider a household in the 24% federal bracket living in California (9.3% state tax, effective combined ~33%). A 4.85% CD yield equals 3.25% after federal and state tax. A 4.45% T-bill yield equals 3.38% after federal tax (state-exempt). The T-bill wins by 13 basis points despite the lower headline rate. In New York City (federal 24% + NY state 6.85% + NYC 3.88% = ~34.7% combined), the after-tax CD yield is 3.17% versus the T-bill at 3.38% — a 21 basis point T-bill advantage.

• Households in CA, NY, NJ, OR, MN: T-bills almost always beat CDs after tax
• Households in TX, FL, NV, WA, TN, NH (no state income tax): CDs beat T-bills on headline yield
• Households in low-tax states (4-6% range): roughly a wash — pick on convenience
• Roth IRA / 401k cash positions: tax-equivalent yield comparison does not apply — pick highest headline yield

The Right Cash Allocation: A Tier-Based Framework

The single biggest mistake most households make is putting all of their cash in one vehicle. The optimal structure separates cash into tiers based on when you will actually need to spend it — and matches each tier with the highest-yielding vehicle that fits the liquidity requirement.

Tier 1: True Emergency Fund (Immediate Access)

• Amount: 3-6 months of essential expenses
• Vehicle: Top-tier HYSA (Wealthfront, Marcus, Ally) or money market fund (VMFXX)
• Goal: instant liquidity, FDIC insurance, never below 4% APY
• Avoid: any vehicle with withdrawal penalties or settlement delays

Tier 2: Short-Term Spending (1-12 Month Horizon)

• Amount: anything earmarked for known spending (taxes, vacation, car purchase, home down payment within 12 months)
• Vehicle: 13-week or 17-week T-bills (laddered) for state-tax states; 6-12 month CDs elsewhere
• Goal: lock in current elevated yields, match the maturity to the spending date

Tier 3: Medium-Term Cash Reserves (12-36 Months)

• Amount: cash you may need but no specific spending purpose
• Vehicle: 12-month CD ladder (build a rolling ladder of 4 CDs maturing at 3-month intervals)
• Alternative: 12-month T-bill rollover for high-tax-state households

Tier 4: Inflation Hedge / Long-Term Cash

• Amount: up to the $10,000 annual I-Bond limit per person
• Vehicle: I-Bonds (purchased via TreasuryDirect.gov)
• Goal: long-term inflation protection, never need to touch this allocation for 5+ years

How To Build A 4-Rung CD Or T-Bill Ladder (Step-By-Step)

A ladder is the single most powerful technique for cash management at the current yield levels. It captures the highest available rates while preserving regular access to maturing principal. Here is how to build one with $40,000:

• Step 1: Divide the $40,000 into four equal $10,000 buckets
• Step 2: Buy a 3-month CD/T-bill, a 6-month, a 9-month, and a 12-month — one per bucket
• Step 3: Every 3 months, one of the four matures. Reinvest it into a new 12-month CD/T-bill
• Step 4: After the first 12 months, you have a continuously rolling ladder where 25% of your money is always within 90 days of liquidity
• Result: you capture the higher yields of 12-month maturities while preserving meaningful liquidity
• Tools: Schwab and Fidelity both offer auto-roll features that handle reinvestment automatically

Common Mistakes To Avoid In May 2026

• Leaving cash in a big-bank savings account paying 0.05% — you are losing roughly $4,500 per year on every $100,000
• Locking long-duration CDs (5-year) at current rates — risk of being locked into below-market yields if rates rise
• Ignoring promotional rates that expire — Wealthfront's 4.85% includes a 0.35% promo bonus that lasts 3 months for new accounts
• Buying I-Bonds for short-term goals — the 12-month lock-up makes them inappropriate for emergency funds
• Buying long-duration Treasury bonds (10+ year) chasing yield — you take significant duration risk that wipes out the yield advantage if rates rise
• Not comparing after-tax yields — high-tax-state households who only look at headline APY consistently leave 15-25 basis points on the table

The Specific Move To Make This Week

If you have not actively repositioned your cash in the last 60 days, the highest-leverage moves to make this week are: (1) move any cash sitting in a 0.05% APY big-bank savings account into a top-tier HYSA — this single change can earn an extra $4,000+ annually on $100,000; (2) if you have known spending in the next 6-12 months, lock that amount in a 6-month or 12-month CD or T-bill at 4.75-5.00%; (3) if you have not yet bought I-Bonds for 2026, purchase up to the $10,000 limit at the current 3.98% composite rate; (4) for high-tax-state households, shift any taxable-account cash from CDs to T-bills to capture the state-tax exemption.

When This Window May Close

The current yield environment is not permanent. Three scenarios would compress the yields available to savers. First, a faster-than-expected pivot to rate cuts by the Fed (currently estimated at September 2026 with 38% probability) would reduce HYSA rates within 30-60 days. Second, sustained labor market weakness would force the Fed to cut more aggressively than guidance suggests. Third, a credit event in the corporate bond market would likely flatten the yield curve and reduce CD competition. None of these scenarios is the base case for the next six months — but they are why locking in 12-month yields at current levels is more attractive than rolling shorter maturities indefinitely.

Bottom Line

The yield environment in May 2026 is the most savings-friendly the US has seen in nearly two decades. Top-tier HYSAs at 4.40-4.85%, 12-month CDs at 4.85-5.00%, and Treasury bills at 4.30-4.50% with state-tax exemption all represent meaningful real returns above current inflation. The optimal play is to (a) move all cash out of low-yielding big-bank accounts immediately, (b) tier the cash by liquidity need into HYSAs, T-bills/CDs, and I-Bonds, (c) build a CD or T-bill ladder for medium-term reserves, and (d) factor in state taxes when ranking yields. Households that take 30 minutes to set this up correctly will earn an extra $4,000-6,000 per year per $100,000 of cash compared to those who leave cash sitting in the wrong vehicles.