An easy to use income tax calculator updated till FY 2018-19 (AY 2019-2020).
Please note, this excel worksheet was made and shared on a personal basis. If you end up not paying taxes due to any bug in this sheet don’t blame me. You have been warned. With a little bit of knowledge you can even edit it to match your payslip exactly. Feel free to use / share. It it totally free and devoid of any copyrights.