My mother is doing a Govt Job, so her tax is automatically deducted, and is also shown on her pay slip. But she is not issued an NTN number and is not classified as a filer
She doesn't need a NTN. Her CNIC would be her log in id, she needs to have a mobile number registered in her name and an email account. That's it. Once her id and password are generated you can access the tax forms on webportal and fill them out yourself. You will face little hardship first time but after that once you get used to the webportal and its design ...... its no rocket science for a salaried person to file his / her annual income tax return. And yes after end of June 30 every year she needs to ask her employer about the tax deduction certificate, her total income and tax deducted and deposited would be appearing on that.