In October 2007, Millicom decided that it would redeem the balance of the 10% Senior Notes in December 2008, and pay the contractual redemption premium of 5% (see note 24). Millicom reviewed its estimates of future cash flows and, as a result, an additional interest expense of $31 million was recorded for the year ended December 31, 2007. The 10% Senior Notes was also reclassified from non-current to current.
Millicom reviewed its position to early repay the Notes in September 2008 and the Board of Directors decided not to early redeem the Notes but to keep them until the contractual maturity date (December 1, 2013). This decision impacted the future expected cash flows and, as a result, the 5% premium accrued in 2007 was completely reversed and an interest income amounting to $29 million was recorded in 2008.
Contingent liabilities are potential liabilities that arise from past events whose existence will be confirmed only by the occurrence or non occurrence of one or more uncertain future events not wholly within the control of Millicom. Provisions for liabilities are recorded when a loss is considered probable and can be reasonably estimated. The determination of whether or not a provision should be recorded for any potential liabilities is based on management's judgment.
Estimates are continually evaluated and are based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. Because of the inherent uncertainties in this evaluation process, actual losses may be different from the originally estimated provision. In addition, significant estimates are involved in the determination of impairments, provisions related to taxes and litigation risks. These estimates are subject to change as new information becomes available and changes subsequent to these estimates may significantly affect future operating results.
Accounting for property, plant and equipment, and intangible assets involves the use of estimates for determining the fair value at the acquisition date, particularly in the case of such assets acquired in a business combination. Furthermore, the expected useful lives of these assets must be estimated. The determination of the fair values of assets and liabilities, as well as of the useful lives of the assets is based on management's judgment.
Deferred tax assets are recognised for unused tax losses to the extent that it is probable that taxable profit will be available against which the losses can be utilised. Significant management judgment is required to determine the amount of deferred tax assets that can be recognised, based upon the likely timing and level of future taxable profits together with future tax planning strategies (see note 13).
For our critical accounting estimates reference is made to the relevant individual notes to these consolidated financial statements, more specifically note 4—Acquisition of subsidiaries, joint ventures and minority interests; note 13—Taxes; note 15—Intangible assets, note 16—Property, plant and equipment, note 18—Trade receivables, note 22—Share based compensation (relating to the long term incentive plan) and note 28—Commitments and contingencies.