Savings Ladder Calculator
Simulate returns from opening a new savings account every month, ladder style
A savings ladder (known in Korea as the "windmill" method) means opening one new fixed-term savings account every month so that, once the first term matures, a payout lands in your hands month after month while your money keeps compounding. Enter your monthly deposit, annual interest rate, term length, and tax option, and this calculator lays out the maturity value of each individual account plus a month-by-month table of accumulated interest and capital actually tied up. Everything runs in your browser, so the amounts you type are never sent to a server.
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How to use
- Enter the monthly deposit and annual interest rate for the new account you'll open each month.
- Set the account term in months and the total simulation period in months.
- Choose the tax treatment: standard, tax-preferred, or tax-free.
- Review the per-account maturity breakdown and the monthly simulation table, then copy the results if you need them.
FAQ
- What exactly is a savings ladder?
- It's a savings strategy where you open one new fixed-term account every month. Once the first term is up, one account matures every month, and you can roll the principal and interest straight into a fresh account.
- How is the interest calculated?
- Pre-tax interest uses the simple-interest formula standard for installment savings accounts (monthly deposit x annual rate x weighting by months held), then the tax rate you selected is applied to get your after-tax interest. The presets follow Korean rates: 15.4% standard, 9.5% tax-preferred, and 0% tax-free.
- What does "capital tied up" mean in the table?
- It's your total deposits to date minus any principal already returned at maturity — in other words, how much of your money is actually sitting in the bank at that point in time.