The Tax Administration Reform Commission (TARC), headed by Parthasarathi Shome, also said the retrospective amendments to tax laws should be avoided as a principle and Income Tax Return should also include wealth tax details.
The panel, which has submitted its first report to Finance Minister Arun Jaitley, also pitched for a separate budget allocation to ensure time bound tax refund and a passbook scheme for TDS (Tax Deduction at Source).
The tax administration, it added, needs to have greater functional and financial autonomy and independence from governmental structures, given their special needs.
It said, the revenue secretary, an IAS, is "likely to have little experience or background in tax administration at the national level and little familiarity with tax."
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The 550-page report further said the two Boards must embark on "selective convergences immediately to achieve better tax governance, and, in next five years, move towards a unified management structure with a common Board for both direct and indirect taxes, called the Central Board of Direct and Indirect Taxes".
"Both central excise and service tax should be covered under a single registration as both the taxes are administered by the same department and cross utilisation of credit is permitted between central excise and service tax under the CENVAT credit rules," it said.
The panel further said it is also necessary to provide for de-registration, cancellation or surrender of registration numbers and PAN.
It said the approach to retrospective amendments has resulted in protracted disputes, apart from having deeply harmful effects on investment sentiment and the macro economy and recommended "retrospective amendment should be avoided as a principle.
Besides, it called for a dedicated organisation for delivery of taxpayer services with customer focus and made a strong case for "pre-filled tax returns".