HMRC recognises that the Pillar 2 arrangements will introduce added complexity to the tax affairs of those large businesses which fall within its remit, and that businesses will need to compute their Corporation Tax differently.39 HMRC has forecast that complying with Pillar 2 will impose one-off costs of £13.7 million and recurring annual costs of £8.2 million across all affected businesses.40 HMRC told us that the Pillar 2 rules have been iterated since being introduced, with HMRC looking to simplify requirements on businesses subject to the UK’s Pillar 2 rules where possible.41