Interest Only Loan Calculator

The Interest Only Loan Calculator estimates the Interest-Only Payment. Simply enter your loan amount, interest rate, and term to calculate your periodic payment and total interest cost. This helps you understand the initial monthly cost of a loan that does not reduce the principal right away. This calculator also calculates the total interest paid during the interest-only period.

Enter the total amount you plan to borrow (e.g., 5000000)
Enter the yearly interest rate (e.g., 8.5 for 8.5%)
Enter the length of time you pay only interest (e.g., 5)
Select how often you make payments

This calculator is for educational purposes only. It is not intended to provide financial advice. Consult a financial advisor for personalized guidance.

What Is Interest-Only Payment

An interest-only payment is the amount of money you pay to a lender on a regular basis that covers only the cost of borrowing. When you make this payment, the amount you owe does not go down. This type of payment is often used for a short time at the start of a loan. It keeps your monthly payments lower at first, but you must pay back the full principal amount later.

How Interest-Only Payment Is Calculated

Formula

Periodic Payment = Loan Amount × (Annual Interest Rate / 100) ÷ Payments per Year

Where:

  • Loan Amount = total borrowed principal
  • Annual Interest Rate = yearly interest rate expressed as percentage
  • Payments per Year = number of payment periods per year
  • Periodic Payment = interest-only payment per period

To find the payment, you first take the yearly interest rate and turn it into a decimal. Then, you divide that number by how many times you pay each year. This gives you the interest rate for just one payment period. Finally, you multiply this small rate by the total loan amount. The result is the amount you must pay for that period to cover the interest.

Why Interest-Only Payment Matters

Knowing this number helps you see the minimum cash flow needed to service a loan. It allows you to plan your budget for the initial phase of the loan. It helps you compare different loan offers based on their starting costs.

Why Managing Cash Flow Is Important for Borrowers

If you do not plan for the end of the interest-only period, your payments may go up a lot later. This payment shock can make it hard to pay your bills. Understanding this calculation now helps you prepare for when you must start paying back the principal amount.

For Investment Properties

Some investors choose interest-only loans to keep their monthly costs low. They may plan to sell the property for a profit before the interest-only period ends. However, if the property value does not go up, they might owe the full loan amount without a profit.

Interest-Only Payment vs. Amortizing Payment

An interest-only payment covers only the interest charges, so the loan balance stays the same. An amortizing payment is larger because it pays both interest and part of the principal. Choosing interest-only may cost more in total interest over time because you are not reducing the debt.

Related Calculators

Calculation logic verified using publicly available standards.

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