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How Pro-Rata Works
Michael Colley avatar
Written by Michael Colley
Updated over 9 months ago

When it occurs

  1. A salaried employee joining mid-month

  2. A salaried employee leaving mid-month

  3. Salary updates

  4. An employee taking unpaid leave

  5. Calculating PILON for leavers (pay for unused holiday)


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How it works

If the salary applies for less than 50% of the pay period

Day rate = Annual salary / Working days in the year

Pay = Day rate x Days worked in pay period


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If the salary applies for more than 50% of the pay period

Day rate = Annual salary / Working days in the year

Pay = Monthly salary – (Day rate x Days not worked in pay period)


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Frequently asked questions

Why have a seperate method depending on how much of a pay period the salary applies for?

Different months have different amounts of working days (for example, January has more more than Febuary).

The average amount of working days in a month is approximately 21.7 days per month. However, a month may have as much as 23 working days.

If the employee works 22 of 23 working days in a long month, and we multiply their day rate by 22, we'll end up with a higher salary than their initial monthly salary. So they'd end up being paid more for taking a day off.

As a result, it's more accurate to subtract from the monthly amount when the employee has worked more than 50% of the working days in the pay period.

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