Savings Goal & Compound Interest Calculator
Forecast compound interest growth from initial deposits and monthly savings additions.
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How to Use the Savings Calculator: Compound Interest & Monthly Growth
- 1Enter your initial starting deposit amount.
- 2Input your recurring monthly contribution.
- 3Specify the annual interest rate (APY) paid by your bank or fund.
- 4Set your savings duration in years to see your projected final balance and total interest earned.
Formula & How It Works
Compound Interest with Monthly Additions
Calculates future balance with periodic compounding and continuous payments.
Worked Examples
$5,000 Starting with $400/Month at 5.0% APY
Input: Initial: $5,000, Monthly: $400, Rate: 5.0%, Duration: 10 Years
Explanation: Depositing $53,000 total principal earns over $17,400 in pure compound interest over a decade.
Frequently Asked Questions
What is the difference between APR and APY?▼
APR is the simple annual interest rate without compounding; APY (Annual Percentage Yield) reflects the true annual return including the effect of compounding.
How often do high-yield savings accounts compound interest?▼
Most high-yield savings accounts compound interest daily and credit the earnings to your account balance monthly.
Is interest earned in a savings account taxable?▼
Yes. Bank interest is taxed at ordinary federal and state income tax rates, and banks issue Form 1099-INT for interest exceeding $10.
How fast does money double at 5% interest?▼
By the Rule of 72, dividing 72 by 5 yields approximately 14.4 years for your money to double without additional contributions.
Quick Reference & Conversion Table
| Monthly Deposit | 5 Years (5% APY) | 10 Years (5% APY) | 20 Years (5% APY) |
|---|---|---|---|
| $200/mo | $13,601 | $31,057 | $82,207 |
| $500/mo | $34,003 | $77,641 | $205,516 |
| $1,000/mo | $68,006 | $155,282 | $411,034 |
| $2,000/mo | $136,012 | $310,565 | $822,067 |
⚠️ Common Pitfalls to Avoid
- •Keeping long-term savings in traditional checking or low-yield accounts earning 0.01% APY instead of 4% to 5% HYSAs.
- •Forgetting that bank interest income is taxable as ordinary income in the year received.
💡 Practical Real-World Uses
- •Planning down payments for home purchases or major vehicle upgrades.
- •Targeting college education savings and emergency safety cushion milestones.
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