The best six-month fixed-rate bonds available in the US market are certificates of deposit, and the most competitive six-month CDs currently pay between roughly 4.00% and 4.20% APY, with federal deposit insurance protecting your principal. In the US, short-term “fixed-rate bonds” are structured as CDs: time deposits where you agree to leave the money untouched for exactly half a year in exchange for a guaranteed rate. The short window keeps your cash within reach relatively soon while earning more than most standard savings accounts.
What You’re Actually Buying
Open a six-month CD and you deposit a lump sum with a bank or credit union, then agree not to touch it for the full term. In return, the institution guarantees a fixed APY that stays the same regardless of Federal Reserve moves or market shifts during those six months. A high-yield savings account can advertise a competitive rate today and quietly drop it next month. A CD removes that risk.
Interest either compounds during the term (daily or monthly, depending on the institution) or gets paid as a lump sum at maturity. Compounding frequency matters more than most people check. A CD compounding daily produces a slightly higher effective return than one compounding monthly or only at maturity, even when the advertised APY is identical. The difference on a six-month deposit is small, but it’s yours for the asking.
Minimum deposits vary widely. Some online banks have no minimum at all. Traditional banks commonly require $500 to $1,000. A few institutions require $5,000 or more to unlock their best-advertised rates, so confirm the minimum before assuming you qualify for the headline APY.
How to Compare Rates Across Institutions
The headline APY is only part of the picture. Financial comparison sites that track CD rates daily are the fastest way to see what’s available across hundreds of banks and credit unions at once. Filter for six-month terms, sort by APY, and then check the minimum deposit, compounding method, and early withdrawal penalty before deciding.
Online-only banks and credit unions consistently offer higher six-month CD rates than large national brick-and-mortar banks. The gap can be half a percentage point or more. The trade-off is the absence of a local branch, but for a product you open once and don’t touch for six months, that rarely matters.
Some institutions run promotional rates for new customers or for savers who also keep a checking account at the same bank. It’s worth asking. A slightly lower APY with no strings attached often beats a promotional rate that requires you to park additional money in a low-yield checking account.
Verify federal insurance before depositing. Confirm FDIC membership on the FDIC’s BankFind tool, or check NCUA coverage for credit unions on the NCUA website. Thirty seconds, non-negotiable.
Early Withdrawal Penalties
The guaranteed rate comes with a catch. Pulling your money out before the six months are up triggers a penalty. Federal law sets a minimum but no maximum, so institutions have wide latitude in what they charge.1HelpWithMyBank.gov. What Are the Penalties for Withdrawing Money Early From a Certificate of Deposit (CD)? The statutory floor is seven days’ simple interest if you withdraw within the first six days, but most banks set penalties well above that.
For six-month CDs, penalties across major institutions range from 60 to 180 days of interest. Some banks will claw back every cent you’ve earned. A few impose forfeiture of all accrued interest regardless of when you break the CD. Two CDs with the same APY can have wildly different real costs if you need your money early, and this line of the fine print is the single most important one.
If the penalty exceeds the interest you’ve earned so far, the bank deducts the remainder from your principal. You can get back less than you deposited. One small consolation: early withdrawal penalties are deductible from your gross income on your tax return, which softens the blow.2Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses
IRA CD Penalties
If your CD sits inside a traditional IRA and you break it before age 59½, you’ll owe the bank’s early withdrawal penalty on the CD itself plus a 10% additional IRS tax on the distribution, since it counts as an early retirement account withdrawal. For SIMPLE IRAs, the additional tax jumps to 25% if you withdraw within the first two years of participating in the plan.3Internal Revenue Service. Retirement Plans FAQs Regarding IRAs Distributions (Withdrawals) The bank penalty alone can seem manageable until the IRS tax lands on top.
Federal Deposit Insurance
CDs at FDIC-insured banks are protected up to $250,000 per depositor, per institution, for each ownership category.4Federal Deposit Insurance Corporation. Understanding Deposit Insurance Credit union deposits get equivalent coverage through the NCUA’s Share Insurance Fund, also up to $250,000 per member-owner for individual accounts.5National Credit Union Administration. Share Insurance Coverage
The “per ownership category” detail matters if you hold multiple accounts at the same bank. A single-ownership CD and a joint CD are insured separately, so a married couple can cover more than $250,000 at one institution by spreading money across ownership categories. A second CD in the same ownership category at the same bank does not get additional coverage. It aggregates with your other deposits there.
A small number of state-chartered credit unions carry private insurance rather than NCUA coverage. Private insurance is not backed by the full faith and credit of the United States.5National Credit Union Administration. Share Insurance Coverage For a product built around capital preservation, federally insured institutions are the straightforward choice.
How CD Interest Is Taxed
CD interest is taxed as ordinary income at both the federal and state level. Your bank will report interest of $10 or more on Form 1099-INT, and you owe the tax for the year the interest is credited to your account, even if you don’t withdraw it.2Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses For a six-month CD, that usually means reporting the interest in the year the CD matures.
If you paid an early withdrawal penalty during the year, you report the full interest earned and then deduct the penalty separately as an adjustment to gross income. You don’t need to itemize to claim it. The deduction sits above the line on your return.2Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses The bank reports both numbers on your 1099-INT: total interest in Box 1 and the penalty amount in Box 2.6Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID
The state tax bite matters in high-tax states. CD interest gets no special treatment. It’s taxed at your full state income tax rate.
Alternatives Worth Comparing
No-Penalty CDs
A no-penalty CD lets you withdraw your full balance without forfeiting interest, as long as you wait at least six days after funding (the federal minimum waiting period). After that window, you can pull your money at any time and keep every cent of earned interest. The trade-off is a lower APY than a standard CD of the same length. Institutions charge for flexibility in the form of a reduced rate. If there’s any real chance you’ll need the money before six months, a no-penalty CD is worth considering even at the lower yield. One early withdrawal penalty on a standard CD can erase months of interest.
Brokered CDs
You can buy a CD through a brokerage account instead of directly from a bank. Brokered CDs carry the same FDIC insurance as bank-direct CDs, and if you need the money early you sell the CD on the secondary market rather than paying an early withdrawal penalty. The risk: your CD’s market value fluctuates with interest rates. If rates have risen since you bought it, you’ll sell at a loss. If rates have fallen, you could sell at a gain. Secondary market sales also involve transaction fees, often around $1 per $1,000 of CD value. For someone almost certain they won’t need the money early, a bank-direct CD with its simpler structure and predictable worst case is usually the better choice.
Six-Month Treasury Bills
A six-month (26-week) Treasury bill is the closest direct competitor. In early 2026, 26-week T-bills have been yielding roughly 3.60% to 3.70%.7U.S. Department of the Treasury. Daily Treasury Bill Rates That’s modestly below the top CD rates, but Treasury interest is exempt from state and local income taxes, which can close or reverse the gap depending on where you live.
If your state taxes income at 10% or more, run the after-tax comparison before defaulting to a CD. You can buy T-bills directly through TreasuryDirect.gov with no fees, or through a brokerage. The downsides: T-bills are sold at auction, so you don’t know your exact rate until the auction clears, and you can’t redeem a T-bill early through Treasury. You’d need to sell it on the secondary market through a broker. For pure simplicity and rate certainty on the day you commit your money, CDs still win.
What Happens When the CD Matures
Federal regulation requires your bank to notify you before your CD matures. For CDs that automatically renew, the institution must send the notice at least 30 calendar days before the maturity date. Alternatively, the notice can arrive at least 20 days before the end of a grace period, as long as the grace period is at least five calendar days.8Consumer Financial Protection Bureau. 12 CFR 1030.5 – Subsequent Disclosures Either way, you should receive advance warning with enough time to decide.
Most six-month CDs auto-renew by default. Do nothing when the maturity notice arrives and the bank rolls your principal and earned interest into a new CD at whatever rate it’s currently offering, which may be well below the rate you originally locked in. The institution is required to disclose whether the account auto-renews and whether a grace period applies when you first open the CD.9eCFR. 12 CFR Part 1030 – Truth in Savings (Regulation DD) Read that disclosure so you know the default before it kicks in.
During the grace period after maturity, you can withdraw the full balance without penalty, roll the funds into a different product, or renew at the bank’s current rate. If rates have dropped, the auto-renewal rate will reflect the decline. If rates have risen, you might find a better deal at a competing institution. Once the grace period closes and the CD auto-renews, you’re locked into a new term and the early withdrawal penalty resets.