Fixed Deposit Calculator Sri Lanka

How this calculator works

• Enter the deposit amount, choose the tenure, and decide whether to apply withholding tax.
• The calculator estimates profit and maturity value using the listed bank rates for the selected period.
• Below the calculator, the full rate table still shows all tracked banks across common fixed-deposit tenures.

Worked example

For LKR 1,000,000 over 12 months, the page estimates the maturity value and compares the bank rates for the same tenure.

Important assumptions

• This version uses the published bank-rate table captured from the referenced public comparison flow rather than live bank APIs.
• Interest is estimated using simple proportional annual interest for the selected tenure.
• If withholding tax is enabled, it is deducted from interest income using the selected rate, which defaults to 5%.
• The all-bank table below shows the lower listed rate when a bank publishes both maturity and monthly-interest options for the same tenure.

Methodology and review

How this calculation is produced

• This tool converts your amount, rate, and term inputs into an estimate using the finance formula defined for the calculator.
• The result is intended to help compare scenarios quickly before you rely on lender-specific fees, taxes, penalties, or product conditions.
• If the underlying product uses a different compounding method or pricing structure, the final real-world number may differ from the estimate shown here.

What to verify before relying on it

• Verify lender rates, compounding, fees, and eligibility rules against the relevant bank or provider before making a commitment.
• Compare the output with official product documents or current rate tables when the decision affects borrowing or savings.
• Use the result for screening and negotiation, then confirm details with the provider or a qualified adviser.

When this tool is useful

• Use this to pressure-test affordability before speaking to banks or lenders.
• Use it when comparing several rates, terms, or savings timelines side by side.
• Use it again whenever rates, tenure, or contribution assumptions change.

How to read the result

• Focus on the total cost and monthly cash-flow impact, not only the headline rate.
• Use the result as a planning estimate before final lender fees, taxes, or eligibility checks.
• If the tool shows several metrics, compare the tradeoff between payment size and total cost over time.

Common mistakes

• Comparing offers by monthly payment alone while ignoring total interest or maturity value.
• Using rates that do not match the real bank product, compounding method, or fee structure.
• Forgetting that approval conditions and documentation can change the final offer.

Good next steps

• Compare this output with rate pages, bank tables, or a second related calculator.
• Check whether fees, taxes, insurance, or penalties need to be added before deciding.
• Keep a margin of safety in the budget instead of planning at the absolute limit.

FAQ

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