(a) Net income or loss from business or profession of an individual.

Where the Federal income tax return of an individual for a taxable year, in which a change of resident status occurs, includes net income or net loss from the operation of a business or profession, a separate computation of the business net income or net loss must be made with respect to each period for which a New York State personal income tax return is required under this Part. If it is not practicable to compute separate amounts of business net income or net loss attributable to the New York State personal income tax returns, the amount reportable on the Federal income tax return for the entire year may be allocated to the period prior to and the period subsequent to the change of residence on the basis of the Federal gross income or gross receipts of the business or profession attributable to each period, provided that the results of such allocation are consistent with the business or professional activities actually carried on during the taxable year. The amount computed in accordance with this subdivision is subject to the provisions of section 154.10 of this Part regarding special accruals, to the extent such accruals relate to the conduct of the business or profession.

(b) Gross profit (loss) and related business expenses from trade or business of a trust.

Where the Federal fiduciary return of a trust for a taxable year in which a change of resident status occurs includes gross profit, gross receipts or gross loss and related business expenses from the operation of a trade or business, a separate computation of the business gross profit or gross loss and related business expenses must be made with respect to each period for which a New York State fiduciary return is required under this Part. The gross profit (loss) from a trade or business and related business expenses reportable on the New York State fiduciary return for the portion of the year during which the trust was a resident trust is determined, except for the special accruals required by section 154.10 of this Part, as if its taxable year for Federal income tax purposes were limited to the period of its resident status. The gross profit (loss) from a trade or business and related business expenses reportable on the New York State fiduciary return for the remaining portion of its taxable year during which the trust was a nonresident trust is determined, except for the provisions of sections 154.10 and 154.11 of this Part, as if its taxable year for Federal income tax purposes were limited to the period of its nonresident status. However, the amounts of gross profit (loss) from a trade or business and related business expenses reportable on the New York State fiduciary return for the portion of the year during which the trust was a nonresident trust must include only that portion of the amount of such items which is attributable to a trade or business carried on in New York State by the trust.