For example, suppose the partnership or S corp. has a year$-$end of March $31,2024$ and the partner$/$shareholder has a year end of December $31,2024.$Three months of the partnership's$/$S corp.$$s year are in the $2024$ taxable year for the partner$/$shareholder and $9$ months of the partnership$/$S corp. year are in the $2023$ taxable year of the partner$/$shareholder$.$Since the partnership$/$S corp. income flows$-$through to the partner$/$shareholder$,$ when does the partner$/$shareholder report his share of partnership$/$S corp. income?