Tax and Ni contribution whilst on May leave

[overdrive31]

I can't get my head around this, hoping someone can help!
My employer has given me a breakdown of my net pay whilst I am on May leave but are unable to tell me what tax, Ni and pension contributions will be deducted. Does anyone know how to work this out? Just a rough idea would help so I'm not shocked when I do get paid!
Thanks everyone

 

[MrsS143]

For me pensions are only on my income from the company. Not the smp side. Same as the others i believe