Deposit interest calculator
Calculate pre-tax interest, after-tax interest, and maturity amount from lump-sum deposit, term, annual rate, and tax rate.
When to use this calculator
Estimate gross interest, tax, net interest, and maturity value for a Korean term deposit.
- Comparing term-deposit rates
- Estimating tax on interest
- Planning where to hold a lump sum
Worked examples
One-year deposit
KRW 10,000,000 for 12 months at 3.5% with 15.4% tax produces about KRW 296,100 net interest.
Shorter term
A six-month term earns roughly half the simple annual interest before bank-specific day counting.
Frequently asked questions
Does this use compound interest?
No. The basic deposit calculator uses simple annual interest prorated by months.
Can the bank result differ?
Yes. Day counts, payment dates, rounding, and product terms can change it.
Is tax always 15.4%?
No. Enter the rate that applies to the product and account holder.
How to interpret the result
This is a comparison estimate, not a bank quotation.
Check early withdrawal rates, deposit insurance limits, and tax treatment before choosing a product.