Corporate trust work will play a bigger overall role in the combined businesses of Perpetual and The Trust Company when the two merge.The merger of Perpetual and The Trust Company via a scheme of arrangement was approved by the Supreme Court of New South Wales this week, with the scheme implementation date being set for December 18.Perpetual currently earns 14 per cent of its revenue and 15 per cent of its EBITDA from its corporate trust division. The merged entity will earn 19 per cent of its revenue and 22 per cent of its EBITDA from its corporate trust division.The Trust Company operates trustee businesses in Australia, New Zealand and Singapore, providing corporate, debt and capital market trustee services. It also offers custody and superannuation compliance services.Perpetual's corporate trust business is a leader in the asset securitisation market and is also strong in mortgage servicing.The merged corporate trust division will have A$449 billion of funds under administration.