Published: 25 October 2026 · Updated: 25 October 2026
A high-yield savings account or a CD can pay many times more than a regular bank account — but the advertised rate only tells half the story. Enter your deposit, APY and term below to see exactly what you will have at the end, with compounding included.
$10,000 at 4.00% APY grows to $10,407.42 in 12 months with monthly compounding — $407.42 of free interest. Compare APY to APY, not headline rates: APY already includes compounding, so it is the only number that tells you what you actually earn. Choose a HYSA for flexible money and a CD for money you can lock away.
Researched by MixKhazana Team · Last updated 25 October 2026 · Data: APY compound-interest formula, FDIC/NCUA insurance limit $250,000 per depositor per institution, IRS Form 1099-INT reporting at $10+ interest
APY (annual percentage yield) is the only savings number that already includes compounding. A bank can advertise a 3.95% interest rate compounded daily and a 4.00% APY — those describe the same account. The formula behind this calculator is the standard compound-interest formula: future value = deposit × (1 + rate ÷ periods)periods × years, where the rate here is the nominal rate implied by your APY. Because you enter APY directly, the calculator converts it to the matching nominal rate for your compounding choice, so daily and monthly versions of the same APY give the same result — exactly as they should.
A HYSA (high-yield savings account) keeps your money accessible: withdraw any time, no penalty, but the rate floats with the market and can fall. A CD (certificate of deposit) does the opposite: your rate is fixed for the whole term, but withdrawing early costs a penalty — commonly 3 to 6 months of interest. That trade is the whole decision: flexibility versus certainty. If you are building the deposit itself, the savings goal calculator works out the monthly amount you need, and the compound interest calculator shows the same maths over decades rather than months.
Safety is not a trade-off here: deposits at FDIC-insured banks and NCUA-insured credit unions are protected up to $250,000 per depositor, per institution, per ownership category. And remember the tax line: interest is taxed as ordinary income, with banks reporting $10 or more on Form 1099-INT each January — a 4% APY in a 22% tax bracket is really about 3.12% after federal tax.
Take $10,000 at 4.00% APY, monthly compounding, 12 months:
Try your own deposit and APY in the widget above.
| Regular savings, 0.01% APY | $10,001.00 |
| HYSA, 3.00% APY | $10,304.16 |
| HYSA, 4.00% APY | $10,407.42 |
| CD, 4.50% APY | $10,459.40 |
| CD, 5.00% APY | $10,511.62 |
APY (annual percentage yield) is the real yearly return on your money including compound interest. Unlike a simple interest rate, APY already accounts for how often interest is compounded, so two accounts with the same APY earn the same amount even if one compounds daily and the other monthly.
APY measures what you earn on savings including compounding; APR measures what you pay on borrowing, usually without compounding. For savings, always compare APY to APY — a higher APR does not mean a better savings account.
A high-yield savings account (HYSA) is a savings account paying a much higher interest rate than a traditional bank account, usually from an online bank with lower overheads. Your money stays accessible at any time, but the rate is variable and moves with the market.
A certificate of deposit (CD) locks your money away for a fixed term — 3 months to 5 years — in exchange for a fixed interest rate. You usually cannot withdraw early without a penalty, typically several months of interest.
Yes, up to the legal limit: deposits at FDIC-insured banks and NCUA-insured credit unions are protected up to $250,000 per depositor, per institution, per ownership category. Always confirm the bank or credit union carries FDIC or NCUA insurance before depositing.
Yes. Interest earned on savings accounts and CDs is taxed as ordinary income at your federal rate (and state rate where applicable). Banks report interest of $10 or more on Form 1099-INT each January.
No — that is exactly what APY is for. Daily compounding at a slightly lower nominal rate and monthly compounding at a slightly higher nominal rate give the same result when their APYs match. Compare APY, not the compounding schedule.
Choose a HYSA for money you may need soon — an emergency fund or a house deposit — because withdrawals are free. Choose a CD for money you will not touch until a known date, when locking in today's rate protects you if rates fall.