In order to avoid inequalities in the level of taxation between staff members of different nationalities, a uniform amount of tax (i.e., staff assessment) is levied by the United Nations and only the resulting net amount is paid to the staff member. Like most national income tax scales, the scale of staff assessment is progressive, i.e., the higher the salary, the higher the percentage rate of assessment. The amount of the staff assessment is credited to the Tax Equalization Fund. 3. Those Member States that do not impose income tax on UN earnings receive a portion of the Tax Equalization Fund as an offset against their assessments for the UN regular budget, peacekeeping, and tribunal budgets. When staff members have to pay national income taxes on their UN earnings, they are reimbursed from the Tax Equalization Fund irrespective of the total amount of staff assessment deducted from their salaries.