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What does the Interest-only payment calculate?
What is the payment while only interest is being charged? This calculator uses loan balance, annual interest rate, and monthly loan fees to estimate interest-only monthly cost immediately in your browser.
With the values currently entered, the result is $1,379.17 — interest-only monthly payment. It also shows monthly interest, and annual interest and fees.
How to use the Interest-only payment
- Replace the example values with your own numbers.
- Review the result and supporting figures as they update automatically.
- Check the formula and assumptions before using the estimate for a decision.
Inputs used
- Loan balance
- Annual interest rate — entered in %
- Monthly loan fees
Interest-only payment formula
Loan balance × annual rate ÷ 12 + monthly fees
Assumptions
- Principal does not decline.
- The rate remains unchanged for the period.
Verify the inputs
Authoritative sources
These sources explain the definitions, factors, or rules behind this tool. Their geographic scope is shown because an official source for one country is not automatically valid somewhere else.
Sources do not endorse Calculum. Check the source date, scope, and your own documents before making a financial, tax, insurance, or reporting decision.
Practical guide
Interest-only payment example and edge cases
What is the payment while only interest is being charged? Let's use a concrete example, then look at the assumptions that can move the answer.
Example: A practical interest-only payment scenario
For this example, use loan balance of 250,000, annual interest rate of 6.5 %, and monthly loan fees of 25. These are starting values, so replace them with numbers that match your situation.
- Loan balance
- 250,000
- Annual interest rate
- 6.5 %
- Monthly loan fees
- 25
Calculated result$1,379.17interest-only monthly payment
Start with interest-only monthly payment. Then check monthly interest, and annual interest and fees to understand what sits behind the main result.
Example results use the default display profile. The calculator above follows your selected country and units.
How to read the result
- Read the main result first. The supporting figures for monthly interest, and annual interest and fees explain how the estimate is built.
- The method is Loan balance × annual rate ÷ 12 + monthly fees. Keep the units consistent and use values from the same time period.
Edge cases worth checking
When loan balance is unusual
Principal does not decline. Double-check this input before relying on the result.
When monthly loan fees is uncertain
The rate remains unchanged for the period. Run a lower and higher value to see a useful range.
What changes the result most
Loan balance
Use a current amount for loan balance. Include fees or recurring costs that belong in the same figure.
Annual interest rate
Test a lower and higher annual interest rate. A small percentage change can move the final result more than expected.
Monthly loan fees
Use a current amount for monthly loan fees. Include fees or recurring costs that belong in the same figure.
Try a different scenario
Small changes show whether the answer is stable or sensitive.
Loan balance: 10% lower
225,000$1,243.75interest-only monthly payment
Loan balance: 10% higher
275,000$1,514.58interest-only monthly payment
Annual interest rate: 10% higher
7.15 %$1,514.58interest-only monthly payment
Common mistakes
Check loan balance
Principal does not decline. Make sure this matches the number you enter.
Keep monthly loan fees consistent
The rate remains unchanged for the period. Use the same units and time period throughout the calculation.
Do not rely on one interest-only payment scenario
Run a cautious case and an optimistic case. The range is often more useful than one exact-looking number.
Use this result well
What is the payment while only interest is being charged?
A lender’s APR, fees, eligibility rules, and contract control the real offer.