Abstract: A method, apparatus and system for computing mortgage insurance premiums for shared equity mortgages are disclosed. Such shared equity mortgages rank behind a conventional interest bearing first mortgage and both mortgages are secured over the same property. Details of the mortgages and property are stored in the data store of a computer system. The future sale price at predetermined future dates for each property is estimated in order to calculate each possible future loss in the event that the shared equity mortgage is terminated at each future date. This information and an estimated probability of termination at each future dates are used to calculate an appropriate insurance premium.