Does paying extra on my loan reduce the interest in Sri Lanka?

Yes. Sri Lankan retail loans use the reducing-balance method, so interest each month is charged on the outstanding balance. Any extra you pay goes straight to principal, shrinking that balance and every future interest charge. The earlier and larger the extra payment, the more interest you avoid.

Is it better to reduce the instalment or the loan term when I prepay?

Shortening the term saves far more interest than lowering the instalment, because you keep paying the same amount while the balance falls faster. This calculator assumes you keep the same instalment and finish early — the interest-optimal choice. A few lenders let you lower the instalment instead; that eases monthly cash flow but saves less.

Do Sri Lankan banks charge a fee for partial prepayment?

It varies by lender and loan type. Many banks allow partial prepayment on housing and personal loans free of charge, while some fixed-rate or leasing facilities levy a small percentage fee. The Financial Consumer Protection Regulations require lenders to disclose these terms up front. Enter your lender's fee in the optional field to see the net saving.

How many years earlier can I finish my housing loan by paying Rs 10,000 extra?

On a Rs 5,000,000 loan at 12% p.a. over 20 years, adding Rs 10,000 to every instalment clears it in about 148 months instead of 240 — roughly 7 years 8 months earlier — and saves about Rs 3.64 million in interest. Your figures depend on your balance, rate, and remaining tenure; enter them above for an exact answer.

What is the difference between prepayment and early settlement of a loan?

Prepayment means keeping the loan open but paying it down faster with extra payments, so you finish earlier and pay less interest. Early settlement means closing the whole loan today by paying the outstanding capital in one go, usually with a settlement fee. This tool handles prepayment; for a payoff-today figure use the early-settlement calculator linked below.

Should I prepay my loan or invest the money instead?

Compare your loan rate with the after-tax return you could earn elsewhere. Prepaying a 12–18% loan is a guaranteed, risk-free saving equal to that rate. If a fixed deposit or investment reliably beats it after tax, investing may win; if not, prepaying is usually the safer, higher return, especially on high-rate personal and vehicle loans.

Does a one-time lump-sum or a small monthly extra save more?

It depends on the amounts and timing. A large lump-sum applied early removes a big chunk of interest-bearing balance at once. A steady monthly extra compounds its effect over many months. Use the two tabs above to compare the same money as a lump-sum versus spread across instalments and see which clears your loan sooner.

Are these prepayment figures exact for my bank?

The maths is exact for any reducing-balance loan, which covers all CBSL-licensed retail lending. Small differences can arise if your bank rounds instalments, uses daily rather than monthly interest accrual, or charges a fee this tool cannot know. Treat the result as an accurate estimate and confirm the payoff schedule with your lender before making a large payment.

Sri Lanka · Finance

Sri Lanka Loan Prepayment Calculator

See exactly how much interest and how many months you save by prepaying your loan — either by adding a fixed extra to each instalment or making a one-time lump-sum part-payment. Reducing-balance maths, no signup, sources cited below.

By Induwara Ashinsana— Executive Director, Ryzera TechnologiesUpdated Jul 18, 2026

Loan prepayment savings

Reducing balance · CBSL method

Outstanding amount

Balance you still owe today.

Annual interest rate

Your loan's rate, per year.

Remaining tenure

20 years left.

Extra per month

Added on top of your normal instalment, every month.

Prepayment fee (optional)

Some lenders charge a fee on part-payments. Leave 0 if yours does not.

Try an example

Time saved

7y 8m

92 months earlier

Interest saved (net)

Rs 3,644,405

New payoff time

12y 4m

148 of 240 months

Base instalment (EMI)

Rs 55,054

Before any extra

This prepayment clears the loan 7y 8m sooner and saves Rs 3,644,405 in interest.

Balance over time Original With prepayment

Original vs prepayment

Measure	Original	With prepayment	Difference
Payoff time	20y	12y 4m	7y 8m sooner
Total interest	Rs 8,213,034	Rs 4,568,629	Rs 3,644,405 less
Total paid	Rs 13,213,034	Rs 9,568,629	Rs 3,644,405 less

Prepayment keeps the loan open and pays it down faster. To close the loan today instead, use the early-settlement calculator linked below.

Figures use the reducing-balance method every CBSL-licensed lender applies. Interest saved is shown net of any fee you enter. Sources cited below the tool.

How it works

Every retail loan from a CBSL-licensed bank or finance company in Sri Lanka charges interest on the reducing-balancemethod: each month you are charged interest only on the principal you still owe. Your fixed instalment first pays that month's interest, and whatever is left chips away at the balance. Because interest is charged on a shrinking balance, any rupee you pay early removes not just that rupee of principal but all the future interest it would have generated.

The baseline instalment (EMI) comes from the standard annuity identity used by every amortisation schedule:

EMI = P · r · (1 + r)ⁿ / ((1 + r)ⁿ − 1)

where P is the outstanding balance, r is the monthly rate (annual rate ÷ 12 ÷ 100), and n is the remaining months. The tool then simulates the loan month by month:

Interest for the month = current balance × r.
Payment = EMI + your monthly extra (or, in lump-sum mode, the lump is subtracted from the balance at the chosen month before interest accrues).
Principal repaid = payment − interest; subtract it from the balance.
Repeat until the balance reaches zero. The number of months is your new payoff time; the accumulated interest is your new total interest.

Interest saved = original total interest − new total interest − any prepayment fee you enter. Months saved = original tenure − new payoff months. The original schedule is computed two ways — the month-by-month simulation and the closed-form identity EMI × n − P — and the two agree to the rupee, which is the correctness check behind the numbers you see.

This is prepayment, not full early settlement: the loan stays open and simply finishes sooner. It also assumes the borrower keeps the same instalment and shortens the term, which saves more interest than asking the bank to lower the instalment. Sri Lankan loans are reducing-balance by regulation, so the flat-rate shortcut some borrowers fear does not apply here.

Worked examples

Housing loan · extra each month

Rs 5,000,000 at 12% p.a., 240 months left, +Rs 10,000/month

Monthly rate r = 12 ÷ 12 ÷ 100 = 0.01
(1.01)^240 = 10.8926 → EMI = 5,000,000 × 0.01 × 10.8926 / 9.8926 = Rs 55,054.31
Baseline interest = 55,054.31 × 240 − 5,000,000 = Rs 8,213,034
Paying Rs 65,054.31/month clears the loan in 148 months
New total interest = Rs 4,568,629
Months saved = 240 − 148 = 92 (7y 8m); interest saved = Rs 3,644,405

Vehicle loan · one-time lump-sum

Rs 3,000,000 at 14% p.a., 84 months, Rs 500,000 lump at month 12

EMI = Rs 56,220.03; baseline interest = 56,220.03 × 84 − 3,000,000 = Rs 1,722,483
At month 12, subtract Rs 500,000 from the balance, keep the same instalment
The loan now clears in 66 months instead of 84
New total interest = Rs 1,172,238
Months saved = 18 (1y 6m); interest saved = Rs 550,244

Edge case · lump-sum in the final month

Rs 3,000,000 at 14% p.a., 84 months, Rs 500,000 lump at month 84

By month 84 only about Rs 55,572 of balance remains
The lump is capped at the outstanding balance (you cannot overpay)
Only that residual is applied, so payoff stays at 84 months
Interest saved is just a few hundred rupees — proof that late lumps barely help
Lesson: to save the most, prepay as early as possible

Frequently asked questions

Sources & references

Rates, balances, and tenures are supplied by you — this tool never quotes a lender's rate. The reducing-balance methodology and prepayment-disclosure guidance were last cross-checked against the CBSL Financial Consumer Protection Regulations on 2026-07-18. The amortisation formula is a universal mathematical identity and does not change.

Related tools

LiveFinance

Sri Lanka EMI Calculator

Calculate monthly EMI, total interest, and a full amortisation schedule for housing, vehicle, personal, and education loans in Sri Lanka. Compares BoC, NSB, Commercial, HNB, Sampath, DFCC, NDB, and People's Bank at their current published rates.

Open tool

LiveFinance

EPF Retirement Projection

Project how big your Sri Lanka EPF balance will grow by retirement. Compounds the statutory 8% employee + 12% employer contributions across your whole career at an assumed EPF interest and salary-growth rate, then splits the final pot into money paid in vs compound interest — with a year-by-year growth curve.

Open tool

LiveFinance

Overdraft (OD) Interest

Work out the interest on a Sri Lankan bank overdraft the way banks charge it — on the daily debit balance at an AWPLR-linked rate, with optional over-limit penal interest, a commitment fee, and an OD-vs-term-loan comparison.

Open tool

Rate this tool

Be the first to rate

Comments & feedback

Spotted a bug or want an improvement? Tell us — our team reviews every comment, and good ideas get built. Comments are public and anonymous.

Found a bug, edge case, or want to suggest an improvement?

Email me at [email protected] — most fixes ship within 24 hours.