A CD Trades Some Access for a More Predictable Return
Behind the glass at the branch, the banker circles the best rate on the sheet — 4.60% — then mentions the catch: the money stays put until next June. That bargain is the whole idea of a certificate of deposit.
A certificate of deposit, or CD, locks a deposit away for a set term in exchange for a stated rate. Banks, credit unions, and brokerages all sell versions of the same trade: patience, paid for.
CD basics at a glance
- The term is fixed up front — commonly three months to five years.
- A standard CD's rate can't change during the term.
- Withdrawing early usually costs several months of interest.
- Bank CDs are FDIC-insured up to $250,000 per depositor, per bank, per ownership category; credit-union certificates get matching NCUA coverage.
How the deal works
Put $10,000 into a one-year CD at 4.50% APY and you'll have about $10,450 at maturity. That number can't drift downward mid-term, because a standard CD carries a fixed interest rate.
The lock cuts both ways, though. If market rates climb to 5.50% next month, your money keeps earning the older, lower rate until the term ends.
The early-withdrawal penalty
Reach in early and the bank charges a penalty, typically a set number of months of interest. Cash out that $10,000 after four months against a six-month penalty and you'd surrender more than you've earned — some penalties even bite into principal.
That's why a CD is the wrong home for money you might need suddenly. An emergency fund belongs where you can reach it without paying for the privilege.
Maturity and the rollover trap
At maturity you get a grace period, often around ten days, to withdraw or move the money. Do nothing and most banks roll the balance into a new CD automatically — at whatever rate that term pays today, not the rate you originally picked.
Laddering softens the lock: split the money across staggered maturities so a piece frees up regularly. Brokered CDs add another wrinkle, since exiting one early means selling it at whatever price the market offers.
The FDIC's guide to shopping for a CD covers the fine print worth reading first.
Before you sign, put the maturity date on your calendar — the grace period won't announce itself.