Dear Zuhair,
if u r planing to purchase any assets in Pakistan more than 120 yrds home, car >= 600cc so these assets should be declare in ur wealth statement however these foreign incomes are exempted from Tax but they have to declare. Once it declare in assets & liabilities accounts and file income tax return then it will be automatically make you active tax payer and a filer. Then no with holding taxes will disturb you.
Regards,
Syed Hamid Ali
S.A. Rizvi & Company
Advocates, Accountants,
Auditors, Tax & Corporate Consultants