You will be very much better off if you can put aside your unhappiness and come to an agreement, however much you dislike that thought. The courts will not count out individual beans for each of you, that is a complete waste of their time. Take the view that you have had sole occupation of the place for 14 months and what you have paid out equals rent to your ex for that. With regard to the 4k if that was the only deposit deduct it from the balance that you are going to receive after the mortgage is paid off and split the remainder 50/50. If he also paid a share of the deposit then just split it 50/50. Settlement through a court can be very crude indeed, and the rules changed recently and you may be ordered to pay costs which may leave you not only with nothing but may create a large debt for you. Settle it yourself, do not get enmeshed in the legal system.