Why are there differences between the forecasted labour in Labour Productivity & the pay run for Ni, Holiday Pay Accrual & Pension costs?

Hi, 

The lovely @Gemma ORiordan has asked the below,

'We are trying understand figures / %’s with how they get updated if changes are needed, and who’s responsibility is this?

We need to know this so that the Labour Productivity report matches as closely as possible to the labour journals produced by the Fourth system which determine actual payments made on the pay run? This is due to differences between the forecasted labour in Labour Productivity & the pay run for Ni, Holiday Pay Accrual & Pension costs.

In summary, what I’d like to know is;

What is the current % for employer NI used in the Labour Productivity report and does this match the % on the salary super journal?
What is the current % for Holiday Pay Accrual in the Labour Productivity report and does this match the % on the salary super journal?
Best way to forecast Employer Contribution Pension costs. Is this done in set up on each employee, for instance would site set up the employee as having opted in & is it set at a standard %, what is that %?
If opting in to a pension at a later date, does someone get notified of this so that the Labour Productivity report can be updated? How would this be done?'

Thanks