Fixed Deposit Calculator
Calculate interest earned on a lump-sum fixed deposit
Input
Simple-interest estimate; product rounding may differ.
Result
- Net Maturity Amount
- ₩10,296,100
- Interest Earned (pre-tax)
- ₩350,000
- Interest Income Tax (14%)
- ₩49,000
- Local Income Tax
- ₩4,900
- Net Interest
- ₩296,100
What is Fixed Deposit Calculator?
This calculator estimates a lump-sum deposit using simple interest and exact integer tax withholding. General treatment separates 14% interest income tax and local income tax. Tax-free treatment requires independent eligibility confirmation. Deposit protection guidance uses a KRW 100 million threshold for protected principal and prescribed interest per depositor at the same institution, but product eligibility must be confirmed separately.
How to Use
- Enter the lump-sum principal as a positive whole-won amount.
- Enter an annual rate and a term from 1 to 120 months.
- Choose tax-free only after confirming product eligibility.
- Review the simple-interest estimate, separate taxes, and protection notice.
Tips & Best Practices
- This calculator uses simple interest and floors the combined integer formula once.
- Enter a whole basis-point rate represented by the percentage input and a term from 1 to 120 months.
- Choose tax-free only after the provider confirms product and personal eligibility.
- General treatment separates 14% income tax and local tax equal to 10% of that tax.
- The 2025-09-01 KRW 100 million guidance is not a legal decision; confirm the product separately.
Use Cases
Lump Sum Savings
Calculate the maturity amount for an inheritance, bonus, or other windfall placed in a fixed deposit.
Offer Comparison
Compare provider quotations using the same simple-interest assumptions.
Tax Comparison
Compare general taxation with an eligibility-confirmed tax-free estimate.
Term Selection
Compare 6-month, 12-month, and 24-month deposit terms to find the optimal balance between liquidity needs and interest earned.
FAQ
Does this calculator use simple interest?
Yes. It calculates principal × basis points × months ÷ 120,000 and floors the integer formula once.
How is general interest tax calculated?
Interest income tax is 14%; local income tax is 10% of that tax, usually 15.4% in total.
Does the calculator determine tax-free eligibility?
No. Tax-free is a user-selected estimate after eligibility is confirmed with the provider.
What does the KRW 100 million notice mean?
From 2025-09-01, it covers protected principal plus prescribed interest per depositor at the same institution. It is not a legal determination.