California Family Code section 4059(c) states that “Deductions for mandatory union dues and retirement benefits, provided that they are required as a condition of employment.” If a party is a member of a union, they will likely be paying union dues. The typical tradeoff for paying such dues is possibly free to low cost insurance and other union benefits. Union dues are like health insurance in that the amount of money paid monthly for union dues is deducted from your gross income. Again like health insurance, this calculation occurs behind the scenes (rather than inserting a lower income in the income field of the support calculator). Union dues also may fluctuate from month to month or the union dues may be front loaded towards the beginning of the year so it is imperative to review/request what the parent paying these dues paid for an entire year in the past to confirm that the correct amount of union dues is being credited to that parent.