Who Can Use This Interest Only Loan Payment Calculator?
This Interest Only Loan Payment Calculator is designed for people involved in commercial property, business and private financing transactions who want to estimate interest-only payments, principal reductions and the balance remaining at maturity.
How to Use the Interest Only Loan Payment Calculator
Enter the information from your proposed loan, mortgage, Vendor Take-Back agreement or financing commitment.
1. Enter the Loan Amount
Enter the principal amount being financed. For example, if a seller provides a $300,000 Vendor Take-Back mortgage, enter $300,000.
2. Enter the Annual Interest Rate
Enter the annual interest rate shown in the financing agreement.
3. Select the Loan Term
Enter the number of years the loan will remain outstanding before maturity.
4. Select the Payment Frequency
Choose weekly, monthly, quarterly or annual payments according to the financing agreement.
5. Enter the Loan Advance Date and First Payment Date
Enter the date the funds are advanced and the date the first payment becomes due. This can be useful where a commercial transaction closes partway through a month.
6. Add Principal to Regular Payments if Required
If the financing agreement requires or permits principal to be paid with each regular payment, enter the applicable principal amount.
7. Add Optional Lump-Sum Principal Payments
Model a one-time payment or recurring principal reductions, including payments every six months or annually, where permitted by the financing agreement.
8. Review the Loan Summary and Detailed Payment Schedule
Review payment dates, opening balance, interest, principal payments, total payments, closing balance, estimated interest and the remaining balance at maturity.
How Is an Interest Only Loan Payment Calculated?
In a basic interest-only structure, regular payments generally cover interest calculated on the outstanding principal without fully amortizing the loan.
Loan Amount: $1,000,000
Annual Interest Rate: 7%
If no principal is paid, the outstanding balance generally remains $1,000,000, subject to the actual financing agreement.
If the borrower later pays $200,000 toward principal, the outstanding balance becomes $800,000.
Actual lender calculations may differ because of compounding, day-count conventions, payment timing, rounding and other contractual terms.
For general information, review the Financial Consumer Agency of Canada guidance on mortgage interest .
Interest Only Loan Calculator With Payment Schedule
A payment amount by itself does not show how the financing changes over the entire loan term.
This interest only loan calculator with payment schedule provides a more detailed view by showing estimated payment dates, opening principal, interest, principal reductions and the balance remaining after each payment.
Interest Only Loan Calculator With Extra Principal Payments
Some interest-only financing arrangements allow or require principal reductions during the term.
- Monthly interest-only payments
- Principal added to every regular payment
- A one-time lump-sum principal payment
- A principal payment every six months
- An annual principal reduction
The calculator allows these scenarios to be modeled so users can estimate how principal reductions may affect future interest and the remaining balance.
Partial First Payment and Interest Calculation
Commercial real estate transactions frequently close between regular payment dates.
Loan Advance Date: October 18
First Regular Payment Date: November 1
The period between the advance date and the first regular payment date may require a separate interest calculation.
Monthly, Weekly, Quarterly and Annual Interest Only Payments
Commercial and private financing agreements do not always require monthly payments. This calculator can estimate:
- Weekly payments
- Monthly payments
- Quarterly payments
- Annual payments
The payment frequency selected in the calculator should match the written financing agreement.
Vendor Take-Back Mortgage Calculator
A Vendor Take-Back mortgage (VTB) is financing provided by the seller to the buyer for part of a property's purchase price.
Purchase Price: $3,000,000
Buyer Equity: $900,000
First Mortgage: $1,800,000
Vendor Take-Back Mortgage: $300,000
For general information about commercial property financing, review BDC commercial real estate financing .
Vendor Take-Back financing should be properly documented by the parties' lawyers. Buyers should also confirm whether the first mortgage lender permits secondary financing.
Interest Only Loan Calculator for Commercial Real Estate
Commercial real estate financing may be structured differently from conventional residential mortgage financing.
- Conventional first mortgage financing
- Vendor Take-Back financing
- Private mortgages
- Interest-only payments
- Balloon payments
- Required principal reductions
- Multiple lenders
- Second mortgages
- Short-term financing
- Refinancing at maturity
Commercial financing should also be considered together with lender fees, legal costs, appraisal requirements, environmental due diligence, insurance, property taxes, working capital and other transaction costs.
What Is a Balloon Payment on an Interest Only Loan?
A balloon payment is a substantial principal amount that remains payable at or near the end of the loan term.
If a borrower has a $500,000 fully interest-only loan and makes no principal payments, approximately $500,000 may remain payable at maturity, subject to the actual financing agreement.
Interest Only Loan Calculator for Gas Station Purchases
Interest-only and Vendor Take-Back financing can be used in some gas station and automotive real estate transactions.
Financing is only one component of evaluating a gas station acquisition. Buyers may also need to investigate:
- Historical fuel volumes
- Fuel margins
- Convenience-store sales
- Fuel supply and branding agreements
- Environmental reports
- Underground storage tanks
- Fuel equipment and dispensers
- Property taxes and utilities
- Working capital and inventory
- Regulatory compliance
Review current Gas Stations for Sale in Ontario and additional fuel-retail commercial real estate information at GasStationForSale.ca .
Buyers and operators can also review our TSSA Gas Station Requirements in Ontario guide.
Interest Only Loan vs. Amortizing Loan
With an interest-only loan, regular payments may cover only interest, leaving some or all principal outstanding.
With an amortizing loan, scheduled payments normally contain both interest and principal, gradually reducing the loan balance.
Frequently Asked Questions About Interest Only Loan Payments
What is the formula for an interest-only loan payment?
A simple monthly calculation is Principal × Annual Interest Rate ÷ 12. Actual lender calculations may differ depending on the loan terms.
What is the monthly payment on a $100,000 interest-only loan?
At 6%, the simple monthly interest payment is approximately $500. At 7%, it is approximately $583.33.
What is the monthly payment on a $500,000 interest-only loan?
At 6%, the simple monthly payment is approximately $2,500. At 7%, it is approximately $2,916.67.
What is the monthly payment on a $1 million interest-only loan?
At a 7% annual rate, a simple monthly interest calculation is approximately $5,833.33 per month.
Does an interest-only payment reduce the loan balance?
Normally, a payment consisting entirely of interest does not reduce principal. The balance decreases when principal is paid.
Can I make principal payments on an interest-only loan?
Some loans permit additional principal payments. Others may contain restrictions, notice requirements or prepayment charges.
What happens after I reduce the principal?
If interest is calculated on the outstanding principal balance, reducing principal may reduce future interest payments.
What happens at the end of an interest-only loan?
Principal that remains unpaid generally becomes payable according to the maturity provisions of the financing agreement.
Can this calculator calculate a partial first payment?
Yes. The calculator can estimate interest between the loan advance date and the first scheduled payment date based on the information entered.
Can this calculator create a detailed payment schedule?
Yes. It can produce an estimated payment schedule showing payment dates, interest, principal payments and the remaining loan balance.
Can this calculator be used for a Vendor Take-Back mortgage?
Yes. An interest-only VTB can be modeled using the loan amount, interest rate, payment frequency, term and applicable principal payments.
Can this calculator be used for commercial real estate?
Yes. It is designed for preliminary analysis of commercial mortgages, private financing and seller-financing arrangements.
Why is my lender's calculation different from this calculator?
Differences may result from day-count conventions, compounding, payment timing, rounding, variable interest rates, fees or other loan-specific provisions.
Compare Interest Only Loan Scenarios Before Finalizing Financing
Use the calculator to compare different loan amounts, interest rates, payment frequencies, terms, advance dates, first-payment dates and principal-payment strategies.
Rather than reviewing only the initial payment, consider the entire payment schedule, estimated interest and the principal balance remaining at maturity.
This Interest Only Loan Payment Calculator is provided for general information, comparison and preliminary financial-planning purposes only.
It does not constitute a financing offer, mortgage commitment, legal opinion, accounting advice, tax advice or investment advice.
Actual payments and balances may differ because of lender-specific calculations, compounding provisions, day-count methods, payment timing, fees, rounding, interest-rate changes, prepayment provisions and other terms contained in the applicable financing documents.