to employment of employees by such person during the calendar year ending during such taxable year. (B) Limitation to wages attributable to qualified business income Such term shall not include any amount which is not properly allocable to qualified business income for purposes of subsection (c)(1). (C) Return requirement Such term shall not include any amount which is not properly included in a return filed with the Social Security Administration on or before the 60th day after the due date (including extensions) for such return. (5) Acquisitions, dispositions, and short taxable years The Secretary shall provide for the application of this subsection in cases of a short taxable year or where the taxpayer acquires, or disposes of, the major portion of a trade or business or the major portion of a separate unit of a trade or business during the taxable year. (c) Qualified business income For purposes of this section— (1) In general The term qualified business income means, for any taxable year, the net amount of qualified items of income, gain, deduction, and loss with respect to any qualified trade or business of the taxpayer. (2) Carryover of losses If the net amount of qualified income, gain, deduction, and loss with respect to qualified trade or businesses of the taxpayer amount for any taxable year is less than zero, such amount shall be treated as a loss from a qualified trade or business in the succeeding taxable year. (3) Qualified items of income, gain, deduction, and loss For purposes of this subsection— (A) In general The term qualified items of income, gain, deduction, and loss means items of income, gain, deduction, and loss to the extent such items are— (i) effectively connected with the conduct of a trade or business within the United States (within the meaning of section 864(c), determined by substituting qualified trade or business (within the meaning of section 199A) for nonresident alien individual or a foreign corporation or for a foreign corporation each place it appears), and (ii) included