The basic steps to buy a CD
To buy a CD, you choose a bank or credit union, pick the term length and interest rate you want, deposit your money, and wait for the maturity date. The process takes about 15 minutes online or in person. You will need a valid ID, your Social Security number, and the cash or a transfer from another account.
Most banks let you open a CD entirely online without visiting a branch. You pick the term (3 months to 5 years, depending on the bank), see the rate locked in, fund the account, and you are done. The money sits untouched until the maturity date, when the bank pays you the principal plus interest.
The main decision is not how to buy — the mechanics are straightforward — but where to buy and what term to choose. That choice determines how much interest you earn and when you can access your money without penalty.
Key Takeaways
- You can open a CD online in about 15 minutes by providing your ID, Social Security number, and the amount you want to deposit.
- CD rates vary significantly by bank and term length, so comparing offers from at least three institutions before depositing is worth the time.
- The penalty for withdrawing early is usually three to six months of interest, so only lock money in a CD if you will not need it before maturity.
- Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs.
- The FDIC insures CDs up to $250,000 per depositor per bank, so splitting large amounts across multiple banks protects your full balance.
Where to buy: online banks versus traditional banks
Online banks almost always offer higher CD rates than traditional banks. As of recent months, online banks have offered rates roughly 0.5 to 1 percentage point higher on the same term. The difference compounds: on a $10,000 CD for one year, that gap means $50 to $100 more in your pocket.
The trade-off is convenience. A traditional bank lets you walk in, speak to a person, and fund the CD from a teller. An online bank requires you to transfer money from another account or mail a check, which takes a few business days. If you need the CD to start earning immediately, a traditional bank is faster. If you can wait three to five days for the transfer, an online bank pays more.
Credit unions often fall between the two. They may offer rates higher than traditional banks but lower than online banks, and many let you open an account in person or online. Some credit unions require membership in a specific employer or community before you can join.
Comparing rates and terms across institutions
CD rates change daily. Before you deposit, check the current rate at three to five banks you are considering. Most banks show the rate on their CD product page without requiring you to log in or start an application.
Write down the rate, the term (3 months, 6 months, 1 year, 2 years, 5 years), and the minimum deposit. Then calculate what your money will earn. A $5,000 deposit at 4.5% for one year earns $225 in interest. The same deposit at 5.0% earns $250. That $25 difference is small, but it is real money you keep.
Term length matters more than you might think. Longer terms usually pay higher rates, but they also lock your money away longer. A 5-year CD might pay 4.8%, while a 1-year CD pays 4.2%. If you think you will need the money in two years, the 5-year CD is a trap — you will either lose three years of interest by withdrawing early, or you will keep money locked away you could have used.
Opening the CD online
Once you have chosen a bank and a term, go to the bank's website and find the CD product page. Click the button to open a new CD. You will be asked for your name, address, date of birth, and Social Security number. Have your ID ready to verify this information.
Next, you will choose the term and enter the amount you want to deposit. The bank will show you the interest rate and calculate how much interest you will earn by maturity. Review this number to make sure it matches your calculation.
Then you will choose how to fund the CD. Most banks let you transfer money from another account at the same bank, transfer from an external bank account, or mail a check. If you transfer from an external account, the bank will ask for your routing number and account number. The transfer usually takes three to five business days. Once the money arrives, the CD starts earning interest immediately.
What happens at maturity
On the maturity date, the bank automatically does one of two things: it deposits your principal plus interest into a linked savings or checking account, or it rolls the CD over into a new CD at the current rate. Check your bank's default policy before you open the CD, because the new rate might be lower than the rate you locked in.
Most banks give you a grace period — usually 7 to 10 days after maturity — to tell them what you want to do. If you do nothing during that window, the rollover happens automatically. If you want the money instead, log into your account and request a withdrawal, or call the bank.
If you want to withdraw the money before maturity, you will pay an early withdrawal penalty. The penalty is usually three to six months of interest, though some banks charge more. On a $10,000 CD earning $200 a year, a three-month penalty costs you $50. That is why you should only buy a CD with money you will not need before the maturity date.
FDIC insurance and protecting large deposits
The FDIC (Federal Deposit Insurance Corporation) insures CDs up to $250,000 per depositor per bank. If the bank fails, you get your money back up to that limit. This protection is automatic — you do not need to do anything.
If you want to deposit more than $250,000, split it across multiple banks. A $500,000 CD split into two $250,000 CDs at two different banks means both are fully insured. The same $500,000 in one bank means only $250,000 is protected; the rest is at risk if the bank fails.
Credit union deposits are insured by the NCUA (National Credit Union Administration) up to the same $250,000 limit. The rules are identical: one account per person per institution is covered up to $250,000.
Avoiding common mistakes
The most common mistake is locking money in a CD you will need before maturity. Before you buy, ask yourself: will I need this money in the next year? If yes, use a savings account instead. The interest is lower, but you can withdraw without penalty.
The second mistake is not comparing rates. Spending 20 minutes comparing three banks can earn you an extra $50 to $100 per year on a modest deposit. That is a $50 return for 20 minutes of work.
The third mistake is forgetting to plan for maturity. Mark the maturity date on your calendar three months in advance. When it arrives, decide whether you want the money or a rollover. If you do nothing, the bank will roll it over at whatever the new rate is — which might be much lower.
Frequently Asked Questions
Can I withdraw money from a CD before it matures?
Yes, but you will pay an early withdrawal penalty, usually three to six months of interest. On a $10,000 CD earning 4% annually, a six-month penalty costs you about $200. Only withdraw early if you truly need the money and the penalty is worth it.
What is the minimum amount I need to open a CD?
Minimum deposits vary by bank and term. Some banks let you open a CD with $500; others require $1,000 or $2,500. Online banks often have lower minimums than traditional banks. Check the bank's website for the specific minimum.
Do I pay taxes on CD interest?
Yes. CD interest is taxable income. The bank will send you a 1099-INT form at the end of the year showing how much interest you earned. You report this on your tax return. The tax is due even if you do not withdraw the money.
What happens if the bank fails while my CD is open?
The FDIC protects your deposit up to $250,000. You will receive your principal plus accrued interest, even if the bank closes. This protection is automatic and requires no action on your part.
Should I buy a CD or a savings account?
Use a CD if you have money you will not need for several months or years and want a may provide rate. Use a savings account if you might need the money sooner or want flexibility. Savings accounts pay less interest but have no withdrawal penalty.