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KPMG report: New OECD releases on global minimum tax

Initial analysis and observations on GMT implementation toolkit and FAQs

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may 8, 2026

The OECD on April 30, 2026, released the global minimum tax (GMT) implementation toolkit and the GMT frequently asked questions—its first updates since the publication of the side-by-side package in January 2026.

The toolkit is primarily aimed at tax administrations implementing the GMT but may help businesses in two ways:

  • While the toolkit is only meant to support best practices, it does illustrate the variation and divergence in local rule interpretation and application of the GMT, a key focus area ahead of the June 30, 2026, filing deadlines for calendar year companies.
  • It calls for grace periods for return correction, penalty relief, and return filing extensions where merited; though it remains to be seen whether administrations follow through.

Read a May 2026 report prepared by KPMG LLP that provides initial analysis and observations on the implementation toolkit and FAQs.

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