I don't know the other party's income

In practice, the amount of child support is calculated based on the income of the party claiming the child support and the income of the party paying it.

If the income of the other party (who pays the support) is revealed in the hearing through disclosure of documents such as submitted data on income, the amount of child support will be calculated based on the confirmed income, etc. If the other party's income does not come to be known through such process, the income may be determined by considering various circumstances such as the status of employment before divorce while in other cases where it is still difficult to determine the income, it may be decided by reference to the so-called wage census (Basic Survey on Wage Structure).