What is the true difference between Flat Rate and Reducing Balance loans?

A flat rate loan charges interest on the full original principal for the entire tenure, even after you have repaid most of it. A 12% flat rate loan is roughly equal to an effective reducing APR of ~21.5%! Most Sri Lankan housing and personal loans use reducing balance, while vehicle leasing often quotes deceptive flat rates.

What is AWPR in Sri Lankan bank loans?

AWPR (Average Weighted Prime Lending Rate) is published weekly by the Central Bank of Sri Lanka (CBSL). Floating-rate housing and corporate loans are typically benchmarked as AWPR + a fixed bank margin (e.g. AWPR + 2%).

Loan & EMI Calculator — Sri Lanka

Q: How is monthly loan installment (EMI) calculated in Sri Lanka?

For reducing balance loans, EMI is calculated using the formula EMI = P Ã— r Ã— (1 + r)^n / ((1 + r)^n - 1), where P is principal, r is monthly interest rate, and n is number of months. In flat rate loans (often vehicle leases), total interest is calculated upfront on the full principal.

Calculate monthly installments, total interest, effective APR, and download your complete repayment schedule.

Loan Details

Loan Amount (LKR)

Annual Interest Rate (%)

Loan Tenure (Years)

Interest Calculation Type

Repayment Summary

Monthly Installment (EMI)

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Total Interest Payable

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Total Amount Payable

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Effective Rate (APR)

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Amortization Schedule

Showing initial 24 months for performance. Check "Show All Months" or Download CSV for the full schedule.

Show All Months

Month	Installment	Principal	Interest	Balance

Sri Lanka Loan & EMI Guide (2026)

Whether you are financing a new home, purchasing a car, or obtaining a personal cash advance from a commercial bank (Commercial Bank, BOC, HNB, Sampath, Seylan, or Nations Trust), understanding your true monthly repayment commitment is critical.

Reducing Balance vs. Flat Rate: The True Cost

Sri Lankan financial institutions utilize two very different calculation models:

Reducing Balance (Diminishing)

Interest is calculated only on the remaining unpaid principal at each month. As your balance shrinks with each monthly EMI payment, the monthly interest portion drops while the principal repayment portion increases. Standard for all regulated housing and personal loans.

Flat Rate (Leasing & Finance Companies)

Interest is calculated on the entire initial loan balance for every single year of the tenure. Even in year 5 when 80% of the loan is paid off, you continue paying interest on 100% of the original borrowed amount. Rule of thumb: An advertised 12% flat leasing rate has an effective reducing APR of approximately 21% - 22%.

Worked Sri Lanka Housing Loan Example

Loan Amount: LKR 5,000,000 (5 Million Rupees)
Annual Interest Rate: 11.00% (Reducing balance)
Tenure: 20 Years (240 monthly payments)
Monthly EMI: LKR 51,609
Total Interest Paid: LKR 7,386,268
Total Cost to Borrower: LKR 12,386,268

Key Bank Charges to Watch Out For

Processing / Documentation Fees: Most commercial banks charge between 0.5% and 1.0% of the loan amount upfront.
Early Settlement Penalties: If you repay or settle your loan ahead of time with a lump sum, banks may charge a 1% to 3% early exit penalty on the remaining capital balance.
AWPR Linked Floating Rates: If your loan agreement is linked to the CBSL Average Weighted Prime Lending Rate (AWPR), your installment will adjust upwards or downwards every 3, 6, or 12 months based on macro interest rate movements.

Frequently Asked Questions

How is monthly loan installment (EMI) calculated in Sri Lanka?

For reducing balance loans, EMI is calculated using standard compounding formulas based on your monthly interest rate and total tenure. For flat rate loans, total interest is calculated upfront across the entire loan period and divided evenly by the number of months.

What is the difference between Flat Rate and Reducing Balance loans?

In a Flat Rate loan, interest is calculated on the original full loan amount throughout the entire tenure. In a Reducing Balance loan, interest is only calculated on the remaining outstanding principal, making it significantly cheaper over time. A 10% flat rate is approximately equal to an 18% reducing balance loan.

Can I download the full repayment schedule?

Yes! Our Sri Lanka Loan Calculator allows you to view the complete month-by-month repayment breakdown and click "Download CSV" to save the full amortization schedule for Excel or Google Sheets.