If you have lived in the property genuinely, even if only for 3 months then the last 36 months of ownership would be exempt from Capital Gains Tax . If the total period of ownership is longer than 36 months, then only the proportion relating to the excess would be chargeable - eg if you owned it for 38 months, only 2/38ths of the rise in value would be liable to tax and would probably be covered by your annual exemption (�9200). You may also be entitled to a taper relief of 5%, depending on whether you sell before or after 5 April 2008. Costs of purchase and sale are also deductable from any gain. If there is still a tax liability after this, then it would be worth explaining the specific details to HMRC to see if they would make any special concessions.