Income Tax Refund status:

https://tin.tin.nsdl.com/oltas/refund-status-pan.html

E-Payment of Income Tax

https://onlineservices.tin.egov-nsdl.com/etaxnew/tdsnontds.jsp

Income tax filing site

https://www.incometaxindiaefiling.gov.in/home

E-Verify Return

https://www1.incometaxindiaefiling.gov.in/e-FilingGS/Services/EverifyHomeLink.html?lang=eng

Link Aadhar

https://www1.incometaxindiaefiling.gov.in/e-FilingGS/Services/LinkAadhaarHome.html?lang=eng

Status of your ITR

https://www1.incometaxindiaefiling.gov.in/e-FilingGS/Services/ITRStatusLink.html?lang=eng

Tax calculator 2020-21

https://www.incometaxindiaefiling.gov.in/Tax_Calculator/index.html?lang=eng

Status of Your PAN

https://tin.tin.nsdl.com/pantan/StatusTrack.html

Advance Tax Calculator

https://www.incometaxindia.gov.in/Pages/tools/advance-tax-calculator.aspx

HRA Calcualtor

https://www.incometaxindia.gov.in/Pages/tools/house-rent-allowance-calculator.aspx

Various other tax calculation tools

https://www.incometaxindia.gov.in/pages/tps/tax-tools.aspx

CHECK THE STATUS OF YOU SELLER UNDER MSME

https://udyamregistration.gov.in/PrintUdyamApplication.aspx