Inland Revenue has retrieved $20.1 million in child support, since it launched a joint operation with the Customs Service last year.
Under a data matching arrangement which began last September, Customs checks names provided by the IRD against its arrival and departure information.
In the nine months to the end of March, IRD was informed of 4608 border crossings by people with a child support debt.
Of that figure, 1208 people have entered into repayment arrangements with the IRD totalling $20.1 million.
