How to use the CD calculator
- Enter your deposit and the CD's APY.
- Enter the term in months: 6, 12, 18, 60…
- Add your tax rate on interest (federal bracket plus state) to see what you keep.
- Optionally, enter the early withdrawal penalty (in months of interest) and a month to cash out early to see what breaking the CD would cost.
A worked example
You put $10,000 in a 12-month CD at 4.1% APY.
- Balance at maturity: $10,410
- Interest: $410
- After 22% tax: $319.80
Now say you need the money after 6 months and the penalty is 3 months of interest ($102.50). You'd have earned about $202.94, so you walk away with about $10,100.44: still more than you put in, but a lot less than if you'd waited.
How term changes the interest
At the same 4% APY, a $10,000 deposit earns:
| Term | Interest |
|---|---|
| 6 months | about $198 |
| 12 months | $400 |
| 18 months | about $606 |
| 5 years | $2,166.53 |
In real life, banks pay different rates for different terms, and sometimes short CDs pay more than long ones. Compare the APY for each term you're considering.
When a CD makes sense
- Money for a known date: a house down payment next year, tuition in 18 months, a car in two years.
- Locking in a rate when you expect rates to fall.
- Keeping yourself from spending it: the penalty is a useful speed bump.
A CD is less suited to your emergency fund, which should be reachable any day without a penalty. The emergency fund calculator helps you size that cushion first.
CD ladders
A CD ladder splits your money across several terms, for example 1, 2, 3, 4 and 5 years. Each year one CD matures and you can either use the money or reinvest it at the 5-year rate. You keep some cash available every year while most of the money earns longer-term rates. Run each rung through this calculator to see the total interest.
Compare with other ways to grow money
For regular monthly deposits, the compound interest calculator shows growth over many years, and the savings goal calculator tells you how much to save each month for a target. For retirement money, a 401(k) with an employer match usually beats a CD: see the 401(k) calculator.
Keep every savings goal in view
A CD is one bucket. Nest is a savings challenge tracker that keeps each goal, deposit and deadline in one place, and Summit is a net worth tracker that shows your CDs next to your other accounts and debts as the total grows. Both have a free demo with sample data.
Frequently asked questions
How much will a $10,000 CD earn in a year?
How is CD interest calculated?
What is the difference between APY and APR on a CD?
What happens if I withdraw from a CD early?
Is CD interest taxable?
Are CDs safe?
Is a CD better than a high-yield savings account?
Written by
Finance Specialist & Editor, VaultlyApps
Emma Whitfield writes and edits the VaultlyApps money guides and free calculators. Her focus is US household finance — budgeting on a real paycheck, paying down credit card and student debt, emergency funds and savings goals, renting — and the money side of freelancing and small-business income, from pricing and profit margins to self-employment tax. Every guide is researched against primary sources such as IRS publications and the CFPB, every number is checked in our tested calculators, and tax content is reviewed each year when new IRS figures come out. Emma is not a licensed financial adviser or tax preparer; her work is general education, not personal advice.
Researched against primary US sources, checked against independent calculators and reviewed by a finance expert on our team. Written for US readers — general education, not financial, tax or legal advice. Editorial policy · Disclaimer
