Formula used
FD maturity is estimated using compound interest: P × (1 + r/n)^(n×t), where P is principal, r is annual rate, n is compounding frequency and t is tenure.
Example calculation
For a ₹1,00,000 FD at 7% for 3 years with quarterly compounding, the maturity value is about ₹1,23,144, of which about ₹23,144 is interest earned before tax.

