Income tax in the United States increase complexity, irrespective of the system's flatness or lack thereof. Income tax is also levied by most U.S. states and many localities on individuals, corporations, estates, and trusts. These taxes are in addition to federal income tax and are deductible for federal tax purposes. State and local income tax rates vary from 1% to 16% of taxable income. Some state and local income tax rates are flat (single rate) and some are graduated. State and local definitions of what income is taxable vary highly. Some states incorporate the federal definitions by reference. Taxable income is defined separately and differently for
Income tax in the Netherlands however, specify how the benefit of the 30% rule should be divided between the employee and the employer. Some employers (e.g. Shell) have stipulated in their general working conditions that the 30% rule income tax benefit is solely for the benefit of the company, arguing that salaries of their local workers would not be on par with their foreign work force. The 30% rule income tax benefit is then divided between an employee and the employer up to the level as if the foreigner employer fictively paid the income tax on the entire salary and the surplus left to the