Hi, thank you for your question. If she is in receipt of certain state benefits she would have to only pay the minimum amount of child maintenance, which is £5 per week and the CSA/CMS's hands will be tied unless you can provide them evidence that her true taxable income is higher than they have assessed. However, you state that she is on maternity leave, and if this is the case, she will likely be on Statutory Maternity Pay, which is a minimal amount of income and therefore her current child maintenance liability will likely be low in any event.
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