KARACHI: The tax authorities are struggling with some 583 court cases related to various levies and duties during the current fiscal year with a senior official saying on Wednesday lingering disputes potentially hindered Rs260 billion in revenue collection.Tariq Masood, member legal FBR said constitutional and writ petitions in tax matters are increasing and they have stays against the tax recovery proceedings.“The interim relief granted by higher court in the shape of stay in such cases is...