I'm buying out the co owner of my house and his solicitor has sent me an agreement that looks very straightforward and I think that I can sign it without a solicitor looking at it. But my new mortgage company is talking about me being liable for stamp duty and capital gains tax in the future. Is this something I should be worried about? the agreement says that we each pay our owns costs and that we are not liable for any payments in the future on either side. It sounds quite fair to me.