HisabCalc › Banking & money

Bank Interest Source Tax Calculator

Find how much source tax is deducted from your bank or FDR interest and how much interest you actually receive.

Enter your numbers

Deposit amount (Tk)

Example: 500000

Annual interest rate

Example: 8

Tenure (months)

Example: 12

Do you have a TIN?

Result

Currency

Figures are computed on your device; nothing is sent anywhere.

Formula

grossInterest = principal x rate / 100 x tenureMonths / 12; tax = grossInterest x 10 / 100 with TIN or 15 / 100 without TIN; netInterest = grossInterest - tax

How the calculation works

Enter the deposit amount, the annual interest rate and the number of months the money stays deposited.

The tool first computes gross interest over the period, then applies the withholding rate of 10 percent when you have an e-TIN and 15 percent when you do not.

It subtracts the tax to show the interest you actually receive, which is the figure to compare across different deposits.

Common mistakes

Forgetting that without an e-TIN the bank deducts 15 percent instead of 10, which cuts a third of your interest away.
Assuming tax applies to very small balances, since no deduction is made when the account balance never exceeds Tk 1,00,000 during the year.

When to use it

Use it to see your real interest income before you commit money to a fixed deposit.
Use it to compare a deposit interest rate with a savings certificate after tax is taken out.

Worked example

Deposit Tk 5,00,000 at 8 percent for 12 months gives gross interest of Tk 40,000. With an e-TIN the tax is 10 percent, so Tk 4,000 is deducted and you receive Tk 36,000.

Gross interest 40,000.00

Tax deducted 4,000.00

Net interest 36,000.00

Common questions

Do I have to pay tax if my deposit is small?

No, tax is not deducted when the balance of an ordinary savings deposit never exceeds Tk 1,00,000 at any time during the year.

Last updated: 2026-10-03