Understanding Society User Support

Hi,

Sorry to bother you. The Understanding Society online variable guide gives the following descriptions for the various household net income variables that are found in the hhresp tables...

fihhmnnet3_dv="total household net income - no deductions"  
   fihhmnnet3_dv="total household net income - individual/household deductions"   
   fihhmnnet4_dv="total household net income - hb adj & individual/household deductions"

I was wondering where I could find out what exactly the "deductions" referred to include, i.e. exactly what has been deducted from net income? Similarly, what exactly does "net" income mean in this context, e.g. is it net of income tax and national insurance only, or are pension contributions taken into account etc??

Would be grateful for any light you could shed on this please. Apologies if there's some obvious guidance I should be looking at (I tried the variable guide and had a look at the questionnaire but maybe I missed something - apologies if so).

Thanks in advance,

David