Income tax return for taxation also vary, making comparisons all the more difficult. Countries that tax income generally use one of two systems: territorial or residential. In the territorial system, only local income – income from a source inside the country – is taxed. In the residential system, residents of the country are taxed on their worldwide (local and foreign) income, while nonresidents are taxed only on their local income. In addition, a very small number of countries, notably the United States, also tax their nonresident citizens on worldwide income. Countries with a residential system of taxation usually allow deductions or credits
Indian Revenue Service (Income Tax) up-to the Apex Scale (Rs.2,50,000 fixed plus allowances) at the post of principal chief commissioner of income tax in the ITD. At the apex level, he can also get selected as a Member or Chairperson of the CBDT. The intermediate grades in this career progression are deputy commissioner, joint commmissioner, additional commissioner, commissioner, principal commissioner and chief commissioner of income tax. An IRS officer is also eligible to be selected as a member of the Income Tax Appellate Tribunal, Authority for Advance Ruling, Income Tax Settlement Commission and Income Tax Ombudsman as per the prescribed eligibility criteria. Income Tax Overseas