Annual Report 2017

142 Annual Report 2017 SET Computer software Patent Work in process Total As at 1 January 2016 Cost 1,328,144 1,958 2,415 1,332,517 Less Accumulated amortisation (827,808) (263) - (828,071) Net book amount 500,336 1,695 2,415 504,446 For the year ended 31 December 2016 Opening net book amount 500,336 1,695 2,415 504,446 Additions 14,748 48 56,472 71,268 Amortisation charge (110,008) (265) - (110,273) Transfer 43,186 - (43,186) - Closing net book amount 448,262 1,478 15,701 465,441 As at 31 December 2016 Cost 1,386,117 2,006 15,701 1,403,824 Less Accumulated amortisation (937,855) (528) - (938,383) Net book amount 448,262 1,478 15,701 465,441 For the year ended 31 December 2017 Opening net book amount 448,262 1,478 15,701 465,441 Additions 28,374 - 52,052 80,426 Disposals (6) - - (6) Amortisation charge (119,659) (262) - (119,921) Transfer 33,746 - (33,746) - Closing net book amount 390,717 1,216 34,007 425,940 As at 31 December 2017 Cost 1,440,305 2,006 34,007 1,476,318 Less Accumulated amortisation (1,049,588) (790) - (1,050,378) Net book amount 390,717 1,216 34,007 425,940 (Unit: Baht’000) 18. Assets formargindeposits andbenefits Thailand Clearing House Co., Ltd. (TCH) is the clearing house for derivatives market. Members of TCH who have outstanding positions are obliged to place the required margin deposits as a guarantee according to the rate or amount called by TCH. TCH may invest the margin proceeds according to specified terms and conditions. The benefits, after deducting management fees, shall be distributed to members at the announced rates and procedures.