Savings Maturity Calculator
Enter monthly deposit, annual interest rate, and period to calculate maturity amount.
Formula
Lump-sum: Maturity = Principal ร (1 + monthly rate)^n
Installment: Maturity = Monthly ร ((1 + rate)^n - 1) / rate ร (1 + rate)
Pre-tax interest. Actual amount may differ after withholding tax.
Worked Examples
10,000,000 at 3.5 % simple interest for two years earns 700,000 and returns 10,700,000.
The same amount at 3.5 % compounded annually returns 10,712,250 - about 12,250 more than simple interest.
How Maturity Value Is Calculated
Simple interest multiplies principal ร rate ร years, compound interest lets each periodโs interest earn interest too. Tax on interest (15.4 % in Korea, 30 % flat in France, 25 % plus solidarity surcharge in Germany, 19-21 % in Spain) and early-withdrawal penalties are not applied here.
Frequently Asked Questions
- What is the difference between simple and compound interest?
- Simple interest is paid only on the original principal, while compound interest is paid on the growing balance, so the gap widens every year.
- Does the calculator handle monthly compounding?
- Yes - pick the compounding frequency; monthly compounding yields slightly more than annual at the same rate because interest is credited earlier.
- Why is the maturity amount lower than I expected?
- Interest is usually taxed at source, and some products deduct charges. Enter the net rate to see what actually arrives in your account.