Hello again, Richard, and thank you for clarifying the situation. My apologies for the misunderstanding.
While the expense for your home is typically a deductible expense for income tax purposes since you are self-employed, there is no set formula or rule with regard to calculating alimony in NJ (as is the case in most states).
Since it is an actual expense you incur though, I would typically argue that the expense should be taken into account when calculating your net income for purposes of determining alimony. Expenses such as depreciation which are not an actual expense should arguably not be included in determining your net income, but since you do pay extra rent/mortgage to have the extra space for your home office, I would argue that it should be deducted from your gross income in determine the amount of net income from your self-employment unless your support order indicates otherwise.
Here is a link which summarizes the law in NJ, which basically indicates that there is no set formula and such issues are typically decided through mediation if the parties cannot agree or the court order does not indicate precisely what income is to be used in determining support.
I hope this helps clarify the situation for you. Please remember to rate my service once you have all the information you need so I will be compensated for my time from the deposit you posted with this website. If you have any other questions, please ask me – I’ll be happy to respond. Thank you!