Equal Principal Calculator
Calculate monthly payments where principal stays constant
Input
Result
This calculator is for informational purposes only and should not be considered as financial advice. Actual values may vary.
What is Equal Principal Calculator?
The Equal Principal Calculator computes your loan repayment schedule using the equal principal payment method, where you repay the same amount of principal each month while the interest portion decreases over time. Under this method, your total monthly payment starts high and gradually decreases throughout the loan term. The principal portion is calculated as the total loan amount divided by the number of months, and interest is charged on the remaining balance each month. For example, if you borrow 100 million won over 120 months, you repay approximately 833,333 won in principal each month, plus interest on the declining balance. This results in lower total interest compared to equal payment amortization because you reduce the principal faster in the early months. The equal principal method is particularly popular among Korean homebuyers and borrowers who expect their income to be stable or who want to minimize the total cost of borrowing. While the initial payments are higher, the decreasing payment structure can feel more manageable over time and is especially advantageous for those considering early repayment. This calculator provides your first and last monthly payments, total payment, total interest, and a detailed amortization schedule.
How to Use
- Enter the loan amount.
- Enter the annual interest rate (%).
- Enter the loan term in months.
- Review the calculation results and amortization schedule.
Tips & Best Practices
- Choose equal principal repayment if you can handle higher initial payments, as you will pay significantly less total interest over the loan term.
- The first monthly payment will be the highest, so make sure it fits comfortably within your budget before committing to this repayment method.
- Compare equal principal with equal payment results for the same loan to see exactly how much interest you save with each method.
- Equal principal repayment is especially beneficial if you plan to repay the loan early, since the remaining balance is always lower than with equal payment loans.
- Factor in that decreasing monthly payments may free up cash flow in later years for other investments or savings goals.
Use Cases
Mortgage Comparison
Calculate both equal principal and equal payment schedules to determine which method saves more in total interest for your home loan.
Early Repayment Planning
See how much lower the remaining balance is at any given point, making early repayment calculations straightforward.
Budget Forecasting
Use the declining payment schedule to plan your long-term household budget, knowing exactly when payments will decrease.
Business Loan Analysis
Evaluate equal principal repayment for business loans where higher early payments are manageable and total cost reduction is a priority.
FAQ
What is equal principal payment?
Equal principal payment means you pay a fixed principal amount each month, while interest is calculated on the remaining balance. Monthly payments decrease over time.
What are the advantages of equal principal payment?
Total interest is lower compared to equal payment amortization. However, initial payments are higher, making it suitable for those with stable income.
Why do monthly payments decrease in equal principal repayment?
Since the same principal amount is repaid each month, the remaining balance decreases steadily, and the interest charged on that balance also goes down.
What does 'principal' mean in a loan?
Principal is the original amount borrowed. Interest is calculated based on the principal, and each payment covers both principal and interest.
Is my financial data stored?
No, all calculations are performed in your browser and no financial data is sent to or stored on any server.
Is equal principal better for early repayment?
Yes, since more principal is paid early on, the remaining balance is lower at any point, making early repayment more cost-effective.
Who should choose equal principal repayment?
Equal principal repayment is ideal for borrowers with stable or increasing income who can afford higher initial payments and want to minimize total interest costs. It is also a good choice for those who may consider early repayment.
How much can I save compared to equal payment amortization?
The savings depend on the loan amount, rate, and term. For a typical 30-year mortgage at 4%, equal principal repayment can save millions of won in total interest compared to equal payment amortization.
Can I switch between repayment methods after taking the loan?
Some banks allow you to switch repayment methods, but this may involve fees or renegotiation. It is best to choose the method that suits your financial situation before signing the loan agreement.
Why do my monthly payments decrease over time?
With equal principal repayment, you pay a fixed amount of principal each month. Since the remaining balance decreases steadily, the interest charged each month also decreases, resulting in lower total monthly payments over time.
Is equal principal repayment available for all types of loans?
Most mortgage products in Korea offer equal principal repayment as an option. However, some personal loans or credit products may only offer equal payment amortization. Check with your bank for available options.
How is the daily interest calculated in equal principal repayment?
Monthly interest is calculated as the remaining loan balance multiplied by the annual interest rate divided by 12. As the balance decreases each month, the interest portion naturally decreases as well.