CD calculator 2026 — USA: interest and the $250,000 FDIC insurance
The Federal Deposit Insurance Corporation (FDIC) insures checking and savings accounts, money market deposit accounts and CDs at insured banks up to at least $250,000 per depositor, per bank, for each account ownership category.
The result is an estimate, not financial or legal advice. Check the exact terms with the company.
Verified companies: Banks · United States
How it is calculated
Interest is calculated monthly at the annual rate ÷ 12. With monthly capitalization it is added to the balance and earns interest itself: final amount = amount × (1 + r)^n, where r is the monthly rate and n the number of months. Without capitalization interest is charged on the principal only and paid out: interest = amount × r × n.
A top-up is added at the end of every month except the last and earns interest from the next month. Interest earned = final amount − the deposit − all top-ups.
The insured amount is the part of the final amount (principal plus interest) within the guarantee limit per depositor and bank; the rest is uninsured. The limit applies to all your accounts in one bank together, so add up your other balances there. Taxes on interest and the bank's own day-count rules are not included.
Frequently asked questions
How much does the FDIC insure?
At least $250,000 per depositor, per insured bank, per ownership category, principal and interest included.
Can I insure more than $250,000 in one bank?
Yes, deposits in different ownership categories (for example a single and a joint account) are insured separately.