Antigua and Barbuda

On 9 September 2026, the Internal Revenue Service (IRS) published final regulations under Section 174A that significantly alter the methods for determining research and experimental expenditures eligible for the Section 41 research credit. The regulations, effective for tax years beginning after 31 December 2025, introduce a new “simplified method” for calculating qualified research expenses (QREs)

On 8 September 2026, New York City Mayor Eric Adams signed Local Law 2026-XXX, enacting a pied-à-terre tax on non-resident owners of second homes in the city. The tax applies to residential properties valued above $5 million that are not the owner’s primary residence and are owned by individuals, trusts, or entities where the beneficial

On 3 September 2026, the IRS issued Notice 2026-XX, signaling a new phase of enforcement and compliance for the Section 41 research and development (R&D) tax credit. The notice outlines enhanced documentation requirements for taxpayers claiming the credit, including mandatory contemporaneous records that connect qualified research activities to business components, detailed time-tracking for employees engaged

As of 1 September 2026, Grant Thornton’s Washington National Tax Office has released an updated analysis of the year-end tax legislative landscape in the United States Congress. With the 2026 election cycle creating a compressed legislative calendar, several significant tax proposals remain active that could impact corporate and individual taxpayers if enacted before the end

On 1 September 2026, the Department of the Treasury and the IRS released proposed regulations (REG-XXXXXX) that would fundamentally revise the calculation of a US shareholder’s pro rata share of a controlled foreign corporation’s (CFC) tested income and tested loss for purposes of the Section 951A global intangible low-taxed income (GILTI) regime. The proposed rules