it mentioned the rules allow couples to rearrange the joint income / ownership. May I know the taxpayer can rearrange the % of ownership in each of tax year? say, 2021/22 is 40:60 and 2022/23 is 30:70 ?
Yes you can rearrange the ownership but it is unlikely you could do it yearly and change it – that looks like tax evasion to me and the revenue will find it. Any exam question assumes 50:50 unless otherwise stated and for TX they will tell you the ratio