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What is a Week 1 / Month 1 Tax Code?

What is a week 1/ month 1 tax code? How is this calculated differently from a normal tax code?

When you use the option week 1/ month 1 with a tax code the software will calculate an employees tax based only on the taxable pay they receive in that pay period and their tax-free allowance for that pay period.

Normal tax calculations work on the total pay an employee has received for the whole tax year against their total tax-free allowance at that point in the year.

Example


Please Note: The following example is designed to illustrate the difference between week/month 1 tax code and a cumulative tax code only. Under no circumstances should this be taken as advice on what tax code you should use or what tax deductions you should expect.


The employee is on 1100L tax code, paid monthly this is £916.67 tax-free pay each month (£11,000 ÷ 12)

Pay Month1234
Taxable pay for month£1,000£1,000£800£1,000
Tax Calculation on 1100L Code
Tax-Free Pay Allowance
(£916.67 * Month Number)
£916.67£1,833.34£2,750.01£3,666.68
Total Taxable Pay for Year £1,000£2,000£2,800£3,800
Total Tax Due YTD
((Total Pay to Date – Total Tax-Free Allowance) * 20%)
£16.67£33.33£10.00£26.66
Tax Taken This period
(Total Tax Due for Year – Tax Already Deducted)
£16.67£16.66£-23.33
Tax Refund
£16.66
Tax Calculation on 1100L Code Week 1 / Month 1
Tax-free Pay Allowance
(£916.67 * 1)
£916.67£916.67£916.67£916.67
Tax Taken This period
((Taxable Pay This Period – Tax-Free Allowance This period) *20%)
£16.67£16.67£0.00£16.67

PLEASE NOTE: These values are for illustrative purposes only assuming a flat 20% tax rate.

You can see the difference in month 3 when the employees pay drops. Using the week 1 month 1 option the employee pays no tax. Using the normal cumulative option the employee actually gets a tax refund.

When using a week 1 / month 1 tax code employees will usually pay slightly more tax. This is normally used as a temporary measure when taking on a new starter and we do not know what their earnings have been at a previous employment in the current tax year.

When you create a new employee record and select one of the starter declaration options as a part of step 1, Kashflow will apply the correct week 1 / month 1 status to the tax code. HMRC will send messages to the registered contact for the PAYE scheme to inform them if this tax code needs to be amended.

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