上のリンクですと、ここですね。
You may make "surplus income" payments
In addition to paying the trustee's fees, you may be required to make additional payments to your trustee for distribution to your creditors. These are called surplus income payments.
Surplus income is the part of your earnings that exceeds the amount of income a family needs to maintain a reasonable standard of living. This amount is set by the OSB annually. The larger your family, the more you are allowed to keep; the more you earn, the more you are required to contribute.
If your surplus income is more than $200 per month, you will be required to contribute 50 percent of that amount.