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Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
was the reduction agreed in writing?
What is your ex's financial position?
is this child maintenance only?
Are you happy with the amount that you are currently paying?
Technically you should have applied to the court for a downward variation when your income went down, then no arrears would have accrued.
It is not too late to apply even now - although you may wait to see whether your ex attempts to enforce the Order.
If she does your ex will need the permission of the court to enforce any arrears over 12 months old and given the fact that she agreed to the reduction it is highly unlikely that the court would agree.
I hope that this is of assistance - please ask if you need further details