Fixed Deposit & Savings Calculator • ස්ථාවර තැන්පතු සහ ඉතුරුම් කැල්කියුලේටරය
Calculate Sri Lanka bank Fixed Deposit (FD) and savings returns, gross vs net interest, 10% AIT tax deductions, monthly payouts, and CBSL Annual Effective Rate (AER).
Fixed Deposit Parameters (ස්ථාවර තැන්පතු විස්තර)
Enter your principal, tenure, and payout terms or pick an official bank tariff
Sri Lanka Licensed Commercial Bank Presets
Click any preset to apply official published rates to your calculation
* Note: Bank interest rates are subject to change by respective treasury divisions without prior notice. Always confirm rates with your bank branch prior to booking deposits.
Total Maturity Payout (කල් පිරෙන මුදල)
Principal of Rs. 1,000,000 + Net interest of Rs. 90,000.
Statutory 10% deduction at source
True annualized yield based on compounding and duration
• Payout Choice: With monthly payouts, your capital doesn't compound because interest is withdrawn every 30 days. In maturity payout schemes, interest is compounded into the balance or calculated on the entire term.
• CBSL AER Formula: Formulated as AER = (1 + r/n)^n - 1. When an investment compounds more frequently than once a year, the AER exceeds the advertised nominal rate.
• SLDIS Protection: Member institutions are regulated by CBSL and eligible deposits are covered by the Sri Lanka Deposit Insurance Scheme up to statutory limits.
Schedule Progression (වාරික කාලසටහන)
1 Periods| Period | Gross | Tax | Net | Balance |
|---|---|---|---|---|
| Year 1 (වසර 1) | Rs. 100,000 | Rs. 10,000 | Rs. 90,000 | Rs. 1,090,000 |
Understanding Fixed Deposit Interest, Taxes & AER in Sri Lanka
In Sri Lanka, licensed commercial banks and specialized finance companies offer fixed deposits with interest paid either at maturity or as periodic monthly/quarterly payouts.
Advance Income Tax (AIT): Under the Inland Revenue Act amendments, financial institutions deduct 10% AIT at source from interest earnings. However, resident individuals whose total assessable annual income does not exceed LKR 1,800,000 can submit an official Self-Declaration Form to their bank to receive 100% tax exemption on interest.
Annual Effective Rate (AER): Mandated by the Central Bank of Sri Lanka (CBSL), AER indicates the true compounded annual return based on the formula AER = (1 + r/n)^n - 1.
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