Thank you. You need to remember that child maintenance is based upon income not capital and the CMS will not get involved with capital but if example he had won the lottery (exaggerating to prove the point) it would be a court application. Not CMS.
CMS will investigate if they believe that a person’s lifestyle is not consistent with their declared income although to be honest in my experience they do not investigate enough or deep enough.
HMRC on the other hand is a different thing altogether. They will go to the nth degree if they believe that someone is not paying the tax because whilst CMS is money paid to you, they really have no incentive (other than their own statistics) to go to the end of the earth whereas HMRC want the money for themselves!
With regard to CMS, there is no liability to pay school trips or anything else such as uniforms et cetera, child maintenance is money paid by the non-resident parent to the resident parent in accordance with the CMS rates. Anything else is gratuitous.
If he will pay anything else directly, take what you can. I would certainly consider reporting the matter to the Revenue.
You can make a court application and as part of the court application you can ask for him to attend court for questioning whereby you would have to produce details of everything in far more depth than CMS would ask for including for example proof of where the money for the car payment and the holidays came from, bank accounts of his business and his partner if needed.
It’s not do it yourself job although there is no legal reason why you cannot do it yourself. You would be better getting a solicitor on the case but there is no legal aid.
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