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Deposit Interest Calculator

Enter your deposit amount, annual rate, term, and tax rate to estimate gross interest, withheld tax, and net maturity value.

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Financial planning notice

This tool provides reference estimates only. Do not use it as the sole basis for lending, repayment, investment, tax, or contract decisions. Confirm the result with your lender, official documents, or a qualified professional before acting.

Net maturity amount

$10,350,000.00

Gross interest

$350,000.00

Tax withheld

$0.00

Net interest

$350,000.00

How deposit interest is estimated

The tool calculates either simple interest or monthly compounding, then subtracts the tax rate you enter to show the after-tax maturity value.

Calculation notes

  • Simple mode: principal × annual rate × term
  • Monthly compound mode: principal × ((1 + monthly rate)^months - 1)
  • Tax treatment differs by country and product, so confirm the final amount with your provider.

Frequently asked questions

What happens if tax rate is zero?expand_more

The calculator will show the full gross interest as net interest and add it to the maturity amount.

Why only simple and monthly compound modes?expand_more

Those two modes cover the most common fixed deposit comparison cases without adding unnecessary complexity.

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