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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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Aviso financeiro

Esta ferramenta fornece apenas estimativas de referencia. Nao a utilize como base unica para decisoes de emprestimo, pagamento, investimento, impostos ou contrato. Confirme o resultado com sua instituicao financeira, documentos oficiais ou um profissional qualificado antes de agir.

Net maturity amount

R$ 10.350.000,00

Gross interest

R$ 350.000,00

Tax withheld

R$ 0,00

Net interest

R$ 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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