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Why does the amount of income tax I pay change from month to month when my salary stays the same?
Income tax is payable on the taxable income earned in the tax year, which runs from 6 April to 5 April. The tax tables will round up to the nearest penny when calculating the amount of tax-free allowances that are applicable in each week or month.
As such, there may be minor fluctuations in the level of tax you pay. Of course, your tax-free allowances might change during the year, reflecting changes in your personal circumstances. This would result in changes to your tax code and your tax deductions.