For purposes of determining child support income, income from self-employment or operation of a business, including joint ownership of a partnership or closely held corporation, is defined as gross receipts minus costs of goods sold minus ordinary and necessary expenses required for self-employment or business operation.
To determine gross income to calculate child support, the follwoing are specifically excluded from ordinary and necessary expenses:
The person seeking to deduct an expense, including depreciation, has the burden of proving, if challenged, that the expense is ordinary and necessary.