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Payroll Calculations

For the purpose of payroll calculations, AIARC considers your annual salary (determined by your Center) to be payable over 12 months. Therefore, for a full month (all days within a month) your base pay is calculated as follows:

  • Annual salary divided by 12 equals monthly pay
    • Example: $50,000 per year ÷ 12 months = $4,166.67 per month.

If you are due a partial month of pay, the amount will be calculated on a pro-rated basis as follows: Annual salary divided by 12 equals monthly pay multiplied by (number of actual days worked in the month divided by the total number of days in the month):

  • Example: Start date of employment is July 17:
    • $50,000 per year ÷ 12 months = $ 4,166.67 per month;
    • $4,166.67 × (15 ÷ 31 days) = $2,016.13 for partial pay.

Please note that some Centers do not adhere to the same calculation basis for the partial month of pay. Please contact Human Resources at your Center in regard to its specific calculation for partial pay.

Please note that all changes concerning payroll matters that are submitted from your Center's Human Resource department to AIARC by the payroll cutoff date for the month will be incorporated into the payroll for that month. Changes submitted thereafter will be implemented in the following month. Please check with your Center for monthly cutoff dates.


There may be instances where you are due a retroactive payment. This occurs when AIARC receives notification of a salary increase, start date of employment or other situation subsequent to the payroll cut-off date. Your retroactive pay (depending whether it is for a full month or partial month) is calculated as follows:

  • ((New salary minus old salary) divided by 12) multiplied by (number of days in month that new salary is in effect divided by total number of days in month) equals retroactive pay.
  • Monthly salary plus retroactive pay equals total salary paid for month.
    • Example: Salary increased from $50,000 to $55,000 on March 20; April payroll will reflect:
    • (($55,000 - $50,000) ÷ 12) × (12 ÷ 31 days) = $ 161.29 retro

Please note that your pay stub will reflect retroactive salary adjustments separately. Retroactive payments for allowances will be added to the allowance amount and will be shown separately.