Benefit cost calculation by removing cutoff dates;

Question

Our client has benefit cost calculations configuration based on cutoff dates:
1.     Employee Cost : Use Age of  1st January of the current year and Annual base pay of  01 October  of the previous year(if the previous record does not exist , consider the current record) in the calculation of employee cost(EECST)
2.     01 st October  of the previous year annual base salary for calculation of employer credit
Now client wants to remove the cutoff dates and wants cost to be reflected in the benefit info type with the change of age and salary;
Iu2019ve tested the system by removing the cutoff dates in the configuration and here is the scenario;
IT 0168 validity dates 01.01.2009- 31.12.9999
Salary increase in info type 0008 : 01.08.2009
As when salary increased in the  0008 from 01.08.2009, cost and coverage amounts in 0168 changed as per the new salary in the existing record of IT 0168 from  01.01.2009;
When I run simulation payroll with forced retro from 01.01.2009, the new benefit cost which are due to change in the salary are getting calculated from  01.01.2009 instead of 01.08.2009;
But we want the new cost should take effect only from 01.08.2009; probably split in the infotype 0168 with the date of salary change or age change may be solution?
I can create this split in 0168 with dynamic action for salary change but I canu2019t do this for age changes;
Kindly advise us the better solution for this?

Answer 1

I worked out the solution as follows:
1. For the employee insurance plans I assigned wage type BSAL as the calculation base in the Payroll > Payroll:USA > Benefits Integration > Enter wage types for plans config step.  This wage type accumulates the wage types used to determine the base salary used in benefit insurance coverage rules
2. Update the wage type characteristics for wage type BSAL, (Personnel Management > Personnel Administration > Payroll Data > Basic Pay > Define Annual Salary > Wage type characteristics) setting the indirect evaluation module to ANSAL. 
3.  The indiect evaluation module ANSAL is where you assign the wage types that make up the accumulation wage type BSAL.  Assign the wage types that make up the BSAL accumulation wage type in Personnel Management > Personnel Administration > Payroll Data > Basic Pay > Define Annual Salary > Relevant wage types for annual salary valuation. 
4. In my case the wage types assigned to BSAL are the basic pay salary wage type and an additional payments (IT0015) wage type.