O Que É Taxas de Juros Compostos

O Que É Taxas de Juros Compostos

What are compound interest rates?

Compound interest rates are those that apply not only to the initial value of the investment, but also to the interest accrued over time. This means that, unlike simple interest, compound interest is calculated on the total amount, which results in the investment growing exponentially.

Fixed Income Simulator

Compare CDB, LCI, LCA, Tesouro Direto e Poupança em segundos

Preencha os campos abaixo com o valor que pretende investir, o prazo e o produto desejado — depois clique em Simular agora para ver o resultado completo com gráfico e comparativo.

CDI / Seliccarregando...
IPCA (12m)carregando...
Savingscarregando...
R$
R$
% CDI
CDB: incide Regressive income tax (22,5% até 180 dias → 15% acima de 720 dias) e IOF nos primeiros 30 dias.
% CDI
LCI/LCA são isentas de IR para pessoa física — ótimas para médio e longo prazo.
% a.a.
Tesouro: incide IR regressivo + taxa de custódia B3 de 0,20% a.a. (já incluída na simulação).
Com Selic acima de 8,5% a.a.: rende 0,5% ao mês + TR. Com Selic ≤ 8,5%: rende 70% da Selic + TR. Isenta de IR.
Como usar: preencha o valor que pretende investir, defina o prazo e escolha o tipo de investimento nas abas acima — depois clique em Simular agora para ver o resultado completo com gráfico e comparativo.

How compound interest rates work

To better understand how compound interest rates work, it is important to consider the concept of capitalization. Capitalization is the process by which interest is incorporated into the initial capital, thus increasing the amount on which interest will be calculated in the next period.

Example of calculating compound interest rates

Suppose you invest R$ 1,000.00 at a compound interest rate of 10% per year. After the first year, your investment will have grown to R$ 1,100.00. In the second year, interest will be calculated not only on the initial R$ 1,000.00, but on the R$ 1,100.00 already accumulated, resulting in a total of R$ 1,210.00.

Advantages and disadvantages of compound interest rates

One of the main advantages of compound interest rates is the potential for accelerated investment growth over time. However, it is important to be aware that, due to the exponential effect of compound interest, small interest rates can result in large amounts of money over the long term.

Conclusion

In short, compound interest rates are a powerful tool for anyone who wants to make their money work for them. Understanding how they work and how they can impact your investments is essential for making more informed and profitable financial decisions.

Share:

Jeferson Santos

Olá! Sou Jeferson Santos, bacharel em Tecnologia da Informação e investidor há 6 anos em ações, fundos imobiliários e renda fixa. Comecei com R$100 e, aplicando análise e disciplina, consegui crescer meu patrimônio em mais de 80% — e conquistar a liberdade financeira que tanto busquei. Criei o Aprender sobre Finanças para compartilhar o que aprendi na prática, sem enrolação e sem promessas irreais. Aqui você encontra conteúdo real, de quem realmente investe.

Author's website