The Company's foreign operations are subject to tax rates that differ from the US federal statutory rate. The unfavorable differential primarily reflects Subpart F inclusions under IRC Section 951 on passive income from foreign subsidiaries and withholding taxes on intercompany distributions, which more than offset the benefit of lower statutory rates in Ireland and Singapore where the Company maintains manufacturing operations and intellectual property holding structures. The net unfavorable impact represents the aggregate effect of these foreign tax provisions applied to the Company's international earnings.

The effective tax rate reflects state and local income tax obligations across multiple jurisdictions where the Company maintains significant business operations. The Company files combined unitary returns in California and New York, which impose corporate income tax rates of 8.84% and 7.25%, respectively. State tax liabilities are apportioned using a three-factor formula weighted toward sales, concentrating tax obligations in high-rate jurisdictions where the Company generates substantial revenue. The amount represents state tax expense net of the federal tax benefit derived from deducting state taxes on the federal return.

The Company recognized net nondeductible expenses that increased the effective tax rate primarily due to stock-based compensation for which the deduction under IRC Section 83 has not yet been realized, meals and entertainment expenses subject to the 50% limitation under IRC Section 274, and executive compensation exceeding the $1 million deductibility cap under IRC Section 162(m). These nondeductible items were partially offset by tax-exempt interest income from municipal bond investments.

The Company recognized current tax expense under the Global Intangible Low-Taxed Income provisions of IRC Section 951A. The inclusion represents excess net tested income from controlled foreign corporations over the ten percent return on qualified business asset investment threshold. The Company accounts for GILTI tax on a current-year basis and does not record deferred taxes on basis differences expected to reverse as GILTI in future periods.