Compound · Savings Calculator
Calculate maturity amount, interest, and interest tax (15.4%) for simple/compound deposits and savings.
Savings Details
Maturity Amount (After Tax)
₩6,082,224
The compound interest / savings calculator computes the maturity amount and interest under simple and compound methods. Whether it's a lump-sum deposit or a monthly installment savings plan, enter the principal, rate, and term to see what you'll receive at maturity.
Simple vs. compound interest
Simple interest accrues only on the principal, while compound interest accrues on interest as well, so the gap widens over longer terms. Compound maturity amount = principal × (1 + rate)^term — for the same rate, compounding always produces more interest.
A note on interest income tax
Interest on deposits and savings is subject to 15.4% withholding (14% income tax + 1.4% local income tax). Your actual payout is the pre-tax interest minus this tax.
Frequently Asked Questions
Which pays more interest, a savings plan or a deposit?
For the same total amount and rate, a lump-sum deposit earns more interest than a monthly installment plan, because money contributed later has less time to accrue interest.
What's the difference between monthly and annual compounding?
Monthly compounding adds interest to the principal every month and recalculates from there, while annual compounding does so only once a year. At the same nominal rate, monthly compounding yields a slightly higher real return.
What is a tax-exempt comprehensive savings account?
A savings product that exempts interest income tax for those meeting certain conditions (such as being 65 or older), letting you receive the full interest tax-free up to a limit.
What's my real return once inflation is factored in?
Real return is the nominal interest rate minus the inflation rate. If the rate is lower than inflation, the real value of your money can actually shrink.
How is the 15.4% interest income tax calculated?
14% income tax plus 1.4% local income tax (10% of the income tax) is withheld from pre-tax interest, and the remaining 85.6% is paid out.
* Pre-tax reference calculation. Your after-tax payout will differ once interest income tax is applied.
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