Stop overtime and bonuses being taken into account for child maintenance, just base the payment on the parent’s standard salary. CMS should only be able to use your standard wage to work out your payment.
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The paying parent can’t better themselves if CMS take all your overtime and bonuses into account. On top of that most people pay 20% extra for using the service. They don’t take into account any other financial commitments, so most paying parents are left struggling when the receiving parent might get help from the government or have another partner and have 2 incomes to pay the bills. Lots of paying parents are in financial hardship.