UK: Finance Act 2026 receives Royal Assent

The rate is used to calculate interest deductions and late payment interest on overdue taxes. 

HMRC updated its country-by-country reporting guidance on 17 March 2026, clarifying which multinational enterprises must report, how to register and submit reports, and the authorisation process for agents acting on clients’ behalf.

Greece’s Circular E. 2011 clarifies procedures for government leases, local official pay, and school crossing guard compensation under the Digital Transaction Tax, including transitional rules, retroactive withholdings, and exemptions.

Mongolia's government has introduced sweeping tax reforms following year-long consultations with 13,000 stakeholders, promising to cut taxes by MNT 2.7 trillion through progressive corporate rates, expanded SME support, enhanced VAT refunds for citizens, and a modernised compliance system that prioritises guidance over penalties—set to take effect in January 2027. 

The US Internal Revenue Service will host a webinar on 24 March 2026 offering tax professionals an opportunity to earn two continuing education credits while learning about business tax changes enacted under the One, Big, Beautiful Bill. The 120-minute session covers key provisions affecting businesses, partnerships, and tax-exempt organisations, with live Q&A access to IRS experts.

New anti-abuse decrees issued in March 2026 require Cyprus-resident companies to maintain comprehensive documentation for interest, dividend, and royalty payments to entities in low-tax and non-cooperative jurisdictions, with penalties of up to EUR 10,000 for non-compliance.