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4111. How is tax calculated for employees with Week 1 / Month 1 tax codes?.
 

If a tax code is on a Week1 /Month 1 basis it means that that whatever week or month of the tax year it is, tax will calculated as if it is the first week or month of the current tax year. The calculation will use the tax free pay allowance for Week 1/Month 1, and ignores any previous pay or tax.