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GLOSSARY

Corporate interest restriction (CIR) definition

ˈkɔːpərɪt ˈɪntrɪst rɪsˈtrɪkʃən (siː-aɪ-ɑː)
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What does Corporate interest restriction (CIR) mean?

The corporate interest restriction in a nutshell 
The corporate interest restriction (CIR) limits the amount of interest deduction (and other financing costs) that a company may claim in computing its profits for UK tax purposes. The rules aim to ensure that the UK tax relief given for financing costs is commensurate with the business activities that are subject to UK corporation tax. 

This overview gives a summary of the CIR rules and how the regime applies.  

When does the CIR apply? 
CIR applies to periods of account starting on or after 1 April 2017 where a worldwide group’s net interest expense in the UK exceeds its interest capacity – that is, in its simplest form, where the group's deductible UK financing costs are £2m or more than its UK financing income.  

What is the worldwide group for CIR purposes? 
A worldwide group for CIR purposes comprises the ‘ultimate parent’, wherever resident, and, if any, each of its subsidiaries wherever

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