Maturity payouts for savings and deposits, and monthly payments on a loan. Savings account for each installment earning over a different span; deposits and savings include the 15.4% interest tax.

How to use it

1. Pick savings, deposit or loan
2. Enter the amount and the annual rate
3. Enter the term in months
4. Read the after-tax amount or the monthly payment

Common questions

Why is the interest on a savings plan less than advertised?

Even at 4% a year, the money you pay in on the last month only works for a month. Only the first payment earns a full twelve months, so the real interest is a little over half of 4% of everything you paid in.

What is the 15.4% interest income tax?

Korea’s 14% income tax on interest plus 1.4% local income tax. It applies to the interest only, not the principal, and the bank withholds it before paying out.

Can the numbers differ from what my bank says?

Yes. It assumes simple interest and does not include bonus rates, tax-free products or compounding. Loans cover equal-instalment repayment only, with fees left out. Treat it as a rough estimate.

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