Fam. Code, § 4071

(a) Circumstances evidencing hardship include the following:

(1) Extraordinary health expenses for which the parent is financially responsible, and uninsured catastrophic losses.

(2) The minimum basic living expenses of either parent’s natural or adopted children for whom the parent has the obligation to support from other marriages or relationships who reside with the parent. The court, on its own motion or on the request of a party, may allow these income deductions as necessary to accommodate these expenses after making the deductions allowable under paragraph (1).

(b) The maximum hardship deduction under paragraph (2) of subdivision (a) for each child who resides with the parent may be equal to, but shall not exceed, the support allocated each child subject to the order. For purposes of calculating this deduction, the amount of support per child established by the statewide uniform guideline shall be the total amount ordered divided by the number of children and not the amount established under paragraph (8) of subdivision (b) of Section 4055.

(c) The Judicial Council may develop tables in accordance with this section to reflect the maximum hardship deduction, taking into consideration the parent’s net disposable income before the hardship deduction, the number of children for whom the deduction is being given, and the number of children for whom the support award is being made.