As per Lawkidunya, How Can Change Individual, Firm and Company NTN
Login to you IRIS account.
In main menu bar click on Registration.
Click on 181 (Form of Registration filed for modification) (Income Tax), which will appear at extreme left.
A form just like New Registration Form will appear , amend data as per your needs.
How Can I Check My NTN Status Online
Check Active Taxpayer status by SMS:::: Type “ATL (space) 7 digits National Tax Number (NTN)” and send to 9966. Check AJ&K Active Taxpayer status by SMS through the following procedure: For Individual, type AJKATL (space) CNIC (without dashes). Send it to 9966.
Why is FBR Inactive Status
Why my filing status is inactive? Remember as per law, in order to check your filer or non-filer status, be sure you’ve already submitted your income tax returns. Moreover, your status will be inactive, if you’ve only created your account or NTN number on FBR, but have not submitted your income tax returns.