With 1st of January falling on a Wednesday, if you are calculating fortnightly payroll periods, you may decide to adjust the last payroll of the year to pay up to 31st December. In such cases, Indigo provides the functionality to adjust the number of extra days paid and Social Security Contributions (SSC) as required.

To close off the year you may decide to pay the extra 2 days up to 31st December in the last payroll. To do this you must enter 2 extra days in the Extra days field of the payroll setup. This would mean that for this payroll employees would be paid for approximately 96 basic hours instead of the usual 80.

Apart from adjusting basic hours, there is an extra Monday to consider, so there is an additional SSC contribution to be added in this payroll to reconcile the number of SSCs added during the year with the actual number of Mondays, which in 2024 (since it's a Leap Year) is 53, so make sure not to exceed this.  

Another reason for this is that the SSC must be deducted at the current year's rate, because in the following year the SSC rates will change due to the cost-of-living adjustment. To deduct an extra SSC contribution, you must change the value in the SSC Contribution field in the payroll setup screen to 3.

If you also want to deduct the extra 2 days in the first payroll of 2025, similar adjustments must be done with a negative amount.
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In this case you may decide to pay for just 1 Week and 2 Days to close off the year up to the 31st December. To do this you must enter -5 in the Extra days field of the payroll setup record to deduct the first day of January. 2 SSC contribution must be deducted from this payroll unless the total amount of SSCs for the 2024 year is not 53.

If you also want to pay the extra 5 days in the first payroll of 2025, similar adjustments must be done.