console > reports > tradebook
Select date range such that it includes all your trades.
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Zerodha allows you to select the date range for a max period of 1 year. If you are investing for more than a year, you will need to download more than one tradebook (xirr calculator has support for multiple file uploads)
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If you have invested from 1st Feb 2018 to 15th Nov 2019: 1. download CSV for 2018-01-01 ~ 2018-12-31 2. download CSV for 2019-01-01 ~ 2019-12-31 3. upload two CSV files in the XIRR calculator
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