💰 만기 실수령액 계산기

What this tool does

Choose a fixed deposit or an installment savings account, enter the amount, term in months, annual rate and tax type, and you get the principal, tax, after-tax interest and the amount received at maturity. For a deposit you enter the lump sum; for savings you enter the monthly contribution. It follows Korean interest-tax rules, and it is useful for seeing how much interest you actually keep before choosing a bank product.

How it is calculated

Both products use simple interest. Deposit interest is principal × annual rate × months ÷ 12. In installment savings each monthly payment earns interest only for the months it remains, so interest = monthly payment × rate × (n + (n − 1) + … + 1) ÷ 12, i.e. payment × rate × n(n + 1) ÷ 2 ÷ 12. Tax is the pre-tax interest times 15.4% for standard taxation (14% income tax + 1.4% local tax), 9.5% for the preferential rate or 0% for tax-free, with fractions of a won dropped; after-tax interest is pre-tax interest minus tax. For example, 10 million won deposited for 12 months at 4% earns 400,000 before tax, 61,600 in tax, 338,400 after tax, and 10,338,400 at maturity. Saving 500,000 a month for 12 months at 4% gives 6 million principal, 130,000 before tax, 20,020 in tax and 109,980 after tax.

• Choose the deposit or savings tab (switching fills in 10 million or 500,000 won as an example)
• Enter the lump sum for a deposit, or the monthly amount for savings
• Enter the term in months and the annual rate as a percentage
• Choose standard 15.4%, preferential 9.5% or tax-free
• Read the principal, tax, after-tax interest and maturity amount

Things to know

• Advertised rates are usually pre-tax annual rates. Under standard taxation you keep 84.6% of the interest.
• At the same rate, savings earn a little over half the interest of depositing the same total up front, because only the first payment earns 12 months and the last earns one.
• This calculator uses simple interest only; monthly-compounding products pay slightly more, so compare with the bank's figure.
• Preferential and tax-free rates apply only to eligible products within set limits; check eligibility before choosing them.
• The tax rates are the 15.4% and 9.5% built into this tool and may change with tax law.
• Closing early applies a much lower early-termination rate, so the result will differ greatly.
• Tax is rounded down to the won, so bank statements may differ by a few won.

Frequently asked questions

An estimate based on Korean tax rules, not professional advice. Rates and taxes vary by product and time and may change with the law.