Savings Calculator

Estimate deposit and installment-savings maturity values with interest method and tax mode.

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Savings conditions

Enter only the amount and interest conditions needed for the selected savings mode.

Savings mode

One-time deposit principal

KRW

10M KRW

Savings period

months

Annual interest rate

Interest calculation method

Interest tax mode

Maturity estimate

Maturity amount, principal, interest, and tax are shown in order.

Maturity amount₩10,296,10010.3M KRW

Principal paid₩10,000,00010M KRW

After-tax interest₩296,100296.1K KRW

Gross interest₩350,000350K KRW

Tax amount₩53,90015.4%

Effective annualized return2.96%

Reference date: 2026-09-17. The standard tax mode uses 15.4% for Korean interest taxation. Promotional rates, early termination, and bank-specific rounding are excluded.

About Savings Calculator

Estimate deposit or installment-savings maturity amounts with a chosen tax assumption.

Choose deposit/installment, simple/monthly-compound interest and standard, tax-free or custom tax. Installments are paid at the start of each month in this model.

Compare scenarios in KRW and download the inputs with the result; confirm the bank’s actual product terms.

The calculation or rendering runs in this browser tab. Copy, download and share actions make the chosen output available outside this tab.

Worked example

Input / settings: Deposit 10,000,000 KRW; 12 months; annual 3.5%; simple interest; tax 15.4%
Action: Calculate
Result: Gross interest 350,000; tax 53,900; net interest 296,100; maturity 10,296,100 KRW.

Calculation model

Deposit simple interest = P × r × n/12; monthly compound = P × ((1+r/12)^n−1).

Installment simple interest = M × n(n+1)/2 × r/12; monthly compound adds M before each month’s interest. Net interest = gross interest − max(gross interest, 0) × tax rate.

Scope and limits

1–1,200 whole months. Excludes daily accrual conventions, preferential-rate conditions, early withdrawal, fees and comprehensive-income settlement. Standard 15.4% models 14% withholding plus local tax; tax-free/custom modes do not determine eligibility.

Frequently asked questions

Why can a bank quote differ?: A bank can use actual dates, payment timing, special rates and tax rounding. This calculator uses the displayed monthly assumptions.

Sources and review dates

Income Tax Act, Article 129 Reviewed 2026-09-17
Standard interest withholding; exceptions require separate treatment.
Local Tax Act, Article 103-13 Reviewed 2026-09-17
Local income tax on withholding.

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