child support - are rpi and bonuses included?

I will try to explain.
If the payer has assets other than the house and business etc etc above £65K then those assets are deemed, for the purpose of child support, to generate an income of 8% so, to quote YA's example, £100,000 would be deemed to produce an income of £8000.
That figure is then divided by 52 to give a weekly income which then assessable for child support.
But the actual income produced by the assets is disregarded. Or at least that is my reading of the regulation. That is the way capital is treated for benefit purposes ; capital above the threshold is deemed to generate an income of £1 p.w. for each £250 or part thereof above the threshold. The URL is http://www.legislation.gov.uk/uksi/2001/156/regulation/18/mad el
£8000 divided by 52 equals £153.84 a week. The payer will pay whatever the percentage happens to be, so if it was 20% he would pay £30.76 extra. That comes, as near as dammit, to the figure calculated by YA. We have reached the same conclusion by a different route, I think.
I doubt if that is any clearer but you have the text of the regulation !

LMM

I thought the £65k assets rule was limited to assets CAPABLE of producing an income but not doing so?

Shares, hopefully, pay a dividend which would be assessable income anyway (nice to find one that pays 8% though!) The departure/diversion was introduced as a way to stop NRPs taking the p claiming that a substantial asset wasn't providing them with an income, for example people would claim that the extra house they owned was lived in by a family member that didn't pay any, or some ridiculously low, rent. 8% was designed to be punitive and force the truth out!