Calculators & Finance tool

Deposit & Savings Interest Calculator

Compare estimated maturity values for a lump sum or monthly savings, with simple/monthly compound interest and tax options.

Interest estimate; Standard tax applies a fixed 15.4%

Account typeChoose a lump-sum deposit or monthly savings plan.

Deposit amount

Annual interest rate

Term

months

Interest method

Tax treatment

Estimated result

Principal$10,000.00

Gross interest$350.00

Interest tax$53.90

Net interest$296.10

Estimated maturity value$10,296.10

Estimate only. Actual interest may differ based on the bank’s day-count convention, deposit dates, rounding, and rate conditions.

For one lump sum
Choose Deposit and enter amount, annual rate, and months. Simple interest uses principal; monthly compounding also earns interest on earlier interest.
For equal monthly contributions
Enter the monthly contribution, not the final savings target. Each contribution earns interest for its remaining months to maturity in this model.
Read gross and net together
Choose Standard tax or Tax-free, then inspect tax and net interest. Maturity value adds net interest to your contributions.

A worked example

Start with: KRW 10,000,000 · 3.5% yearly · 12 months · Standard tax
Check the result: Gross interest ₩350,000 · net ₩296,100 · maturity ₩10,296,100

This example applies the tool’s fixed 15.4% tax setting to ₩350,000 interest.

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