How much I need to invest in order to withdraw a fixed amount in future

In your query, you have not mentioned the fixed amount that you want to withdraw every month for the next 15 years. unless you know this amount, how can anyone figure out how much to invest now?

Also, you need to decide in which investment instrument you want to put your money? Is it fixed deposits, postal investments or mutual funds. Even in mutual funds, there are various category of funds suiting the various risk profiles of investors.

Once you have all these answers, do write back to us in order to answer us your query in detail.

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