Savings Plan Maturity
The first deposit earns interest for the whole term while the last earns almost none, which is why an instalment plan pays roughly half what a lump-sum deposit at the same rate would.
Your numbers
Final amount
19,154,417
Total deposited
18,000,000
Interest
1,154,417
Formula
Final amount = Σ Monthly deposit × (1 + r) ^ n, r = Annual rate ÷ 1200
The interest shown is before tax — Korean interest income tax of 15.4% reduces what you actually receive.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Monthly depositThe amount you pay in every month. | 500,000 | 0 and up |
| Annual rate (%)Interest quoted per year; the monthly rate is this over 12. | 4 | 0 and up |
| Months (mo)The period counted in months; a yearly rate gets divided by twelve. | 36 | 1 and up |
Step by step
Quick reference table
Results when only Monthly deposit changes and everything else stays put.
| Monthly deposit | Final amount | Total deposited | Interest |
|---|---|---|---|
| 250,000 | 9,577,209 | 9,000,000 | 577,209 |
| 375,000 | 14,365,813 | 13,500,000 | 865,813 |
| 500,000 | 19,154,417 | 18,000,000 | 1,154,417 |
| 750,000 | 28,731,626 | 27,000,000 | 1,731,626 |
| 1,000,000 | 38,308,834 | 36,000,000 | 2,308,834 |
What each result means
| Result | At default values |
|---|---|
| Final amountPrincipal plus interest — what you get at the end. | 19,154,417 |
| Total depositedEverything you paid in over the period, interest not included. | 18,000,000 |
| InterestThe interest earned or owed over the period. | 1,154,417 |
Common mistakes
The interest shown is before tax — Korean interest income tax of 15.4% reduces what you actually receive.
Glossary
- Monthly deposit
- The amount you pay in every month.
- Annual rate
- Interest quoted per year; the monthly rate is this over 12.
- Months
- The period counted in months; a yearly rate gets divided by twelve.
- Final amount
- Principal plus interest — what you get at the end.
- Total deposited
- Everything you paid in over the period, interest not included.
- Interest
- The interest earned or owed over the period.
Frequently asked questions
Q. How is Savings Plan Maturity calculated?
Final amount = Σ Monthly deposit × (1 + r) ^ n, r = Annual rate ÷ 1200 — The first deposit earns interest for the whole term while the last earns almost none, which is why an instalment plan pays roughly half what a lump-sum deposit at the same rate would.
Q. Can you walk through an example?
With Monthly deposit 500,000, Annual rate 4%, Months 36mo, the answer is Final amount 19,154,417.
Q. What do I need to enter?
Enter Monthly deposit, Annual rate, Months. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Monthly deposit moves the answer to Monthly deposit 250,000 → Final amount 9,577,209 and Monthly deposit 1,000,000 → Final amount 38,308,834. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
The interest shown is before tax — Korean interest income tax of 15.4% reduces what you actually receive.
Related calculators
Tax rates and interest conventions differ by country and product — check your contract for real transactions.