Additional Payment. (a) If, notwithstanding the provisions of Section 8(a)(ii), but subject to [subsection (b)], it is ultimately determined by a court or pursuant to a final determination by the Internal Revenue Service that any portion of Total Payments is subject to the tax (the “Excise Tax”) imposed by Section 4999 of the Code (or any successor provision), then the Company shall pay to the Executive an additional amount (the “Gross‑Up Payment”) such that the net amount retained by the Executive after deduction of any Excise Tax and any interest charges or penalties in respect of the imposition of such Excise Tax (but not any federal, state or local income tax) on the Total Payments, and any federal, state and local income tax and Excise Tax upon the payment provided for by this Section 23 shall be equal to the Total Payments. For purposes of determining the amount of the Gross‑Up Payment, the Executive shall be deemed to pay federal income taxes at the highest marginal rate of federal income taxation in the calendar year in which the Gross‑Up Payment is to be made and state and local income taxes at the highest marginal rates of taxation in the state and locality of the Executive’s domicile for income tax purposes on the date the Gross‑Up Payment is made, net of the maximum reduction in federal income taxes that could be obtained from deduction of such state and local taxes.