There are 2 ways to track your income tax refund:
Income Tax Portal
Step 1: Log in to your account on the Income Tax portal with your login credentials
Step 2: Click on ‘My Account’ > ‘Refund/Demand Status’ from the pop-up menu
Step 3: Enter the assessment year for which you would like to check the refund status
Step 4: You will be able to view your Refund/Demand Status
NSDL website
Step 1: Navigate to the NSDL website
Step 2: Enter the PAN and Assessment Year and click on 'Proceed'
Step 3: You will be able to view your Refund/Demand Status
Here's a complete guide on Income Tax Refund.