After deducting or collecting tax at source and depositing it with the government, the deductor must give the payee a certificate of tax deducted.
It must show
- The payee’s name and TIN (if any)
- The amount of tax deducted
- Details of the deposit (challan number, date and so on)
- The section(s) under which tax was deducted
Reference: Income Tax Act 2023, section 145.
As a taxpayer you use this certificate to claim tax credit in your return, so ask the deductor for it if you have not received it.