Charles Marshall

Hello, I sold my previous primary residence in April 2024. I then moved to another residence as my primary home. i have had a second home since October 2005 and have lived there part of the time since then. I am now considering nominating this second home as my primary residence as it may prove better for my needs in my later years. It has increased in value since 2005 and so I shall have to pay Capital Gains Tax. When do I need to pay capital gains tax? In the immediate future if I nominate it as my primary residence? Or when it is eventually sold? Kind regards, Charles