I agree with this ^^^
Also, if the ex asks to adjust now and you refuse, you could owe arrears next year for any under payment. IMO, I would adjust now. Yes, you will have to pay more now. But it saves having to pay a lump sum in arrears (or arrears on top of the increased amount).
If CS is recalculated yearly, and we pay CS based on previoustax return year, why would we be in arrears? Won’t he get the benefit of more CS next year when we recalculate?
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