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78GUARDIAN MEDIA LIMITED AND ITS SUBSIDIARIESNOTES TO THE CONSOLIDATED FINANCIAL STATEMENTSFOR THE YEAR ENDED 31 DECEMBER 20157. Employee benefts (continued)The sensitivity analyses above have been determined based on a method that extrapolates the impact on net defned beneft obligation as a result of reasonable changes in key assumptions occurring at the end of the reporting period.The pension plan is maintained at a signifcant surplus; the Group has chosen not to take any contribution holidays to ensure the continued health of the Plan in changing economic circumstances. The Group%u2019s contribution rate of 4% of pensionable salaries will continue into the foreseeable future.The Group is expected to contribute $1.45 million to its defned beneft plans and $0.27 million to its post-employment beneft plans in 2016.The weighted average duration of the defned beneft obligation at the end of the reporting period is 17 years (2014: 17 years) for the defned beneft plan and 13 years (2014: 11 years) for the post-retirement medical plan.8. Deferred taxation2014(Credit)/ charge to income(Credit)/ charge to OCI 2015$ $ $ $Deferred tax asset Employee beneft obligation (1,111) (18) 6 (1,123) Deferred tax liabilities Property, plant and equipment 4,047 855 %u2013 4,902Finance leases 9,812 101 %u2013 9,913Employee benefts asset 23,155 560 (2,033) 21,682 37,014 1,516 (2,033) 36,497Net 35,903 1,498 (2,027) 35,374(Expressed in Thousands of Trinidad and Tobago Dollars, except where otherwise stated)(Continued)