BIM41090 | Specific receipts: reverse premiums: contributions to fitting out costs on assets qualifying for capital allowances
From HM Revenue & Customs · Business Income Manual
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If the landlord contributes to the tenant's expenditure on fitting out, the contribution may be deducted from expenditure otherwise qualifying for capital allowances in the tenant's hands under . See .
Any sum is not a reverse premium to the extent that it reduces the recipient's capital allowances qualifying expenditure in this way.