Hi,
As per the information provided, we assume the payment referenced concerns the maintenance and repair obligations. If so, such payment would not be exempt from tax as it relates directly to the rental business and would be declared within the tax year the payment was received as income, with the subsequent repair costs declared within the usual way under allowable expenses if they meet the required criteria as revenue expenses as per the following guidance:
PIM2025 - Deductions: repairs: overview
Thank you.