Note 30 Pension and Other Post-Retirement Benefit Plans

a) Defined benefit plans

The Group has established various pension plans inside and outside of Switzerland. The major plans are located in Switzerland, the UK, the US and Germany. Independent actuarial valuations are performed for the plans in these locations. The measurement date of these plans is 31 December for each year presented.

The pension funds of Atel Ltd. and some of its group companies in Switzerland and Germany are included in the disclosure as at 31 December 2005 and 31 December 2004.The pension plans of the three private banks, Banco di Lugano, Ehinger & Armand von Ernst and Ferrier Lullin are no longer included in the disclosure as at 31 December 2005.

The overall investment policy and strategy for the Group’s defined benefit pension plans is guided by the objective of achieving an investment return which, together with the contributions paid, is sufficient to maintain reasonable control over the various funding risks of the plans. The investment advisors appointed by plan trustees are responsible for determining the mix of asset types and target allocations which are reviewed by the plan trustees on an ongoing basis. Actual asset allocation is determined by a variety of current economic and market conditions and in consideration of specific asset class risk.

The expected long-term rates of return on plan assets are based on long-term expected inflation, interest rates, risk premiums and targeted asset class allocations. These estimates take into consideration historical asset class returns and are determined together with the plans’ investment and actuarial advisors.

Swiss pension plans

The pension fund of UBS covers practically all UBS employees in Switzerland and exceeds the minimum benefit requirements under Swiss law. Contributions to the pension fund of UBS are paid for by employees and the employer. For the main plan, the employee contributions are calculated as a percentage of insured annual salary and are deducted monthly. The percentages deducted from salary for full benefit coverage (including risk benefits) depend on age and vary between 7% and 10%. The employer pays a variable contribution that ranges between 150% and 220% of the sum of employees’ contributions. The computation of the benefits is based on the final covered salary. The benefits covered include retirement benefits, disability, death and survivor pensions, and employment termination benefits.

Additional employee and employer contributions are made to the other plans of the pension fund of UBS. These plans provide benefits which are based on annual contributions as a percentage of salary and accrue at a minimum interest rate annually.

The employer contributions expected to be made in 2006 to the Swiss pension plans are CHF 416 million. The accumulated benefit obligation (which is the current value of accrued benefits without allowance for future salary increases) for these pension plans was CHF 18,863 million as at 31 December 2005 (2004: CHF 18,566 million, 2003: CHF 16,817 million).

Foreign pension plans

The foreign locations of UBS operate various pension plans in accordance with local regulations and practices. Among these plans are defined contribution plans as well as defined benefit plans. The locations with defined benefit plans of a material nature are in the UK, the US and Germany. The UK and the US defined benefit plans are closed to new entrants who are covered by defined contribution plans. The amounts shown for foreign plans reflect the net funded positions of the major foreign plans.

The retirement plans provide benefits in the event of retirement, death, disability or employment termination. The plans’ retirement benefits depend on age, contributions and level of compensation. The principal plans are financed in full by the Group. The employer contributions expected to be made in 2006 to these pension plans are CHF 75 million. The funding policy for these plans is consistent with local government and tax requirements.

The assumptions used in foreign plans take into account local economic conditions.

The accumulated benefit obligation for these pension plans was CHF 4,992 million as at 31 December 2005 (2004: CHF 4,118 million, 2003: CHF 3,609 million). For pension plans with an accumulated benefit obligation in excess of plan assets, the aggregate projected benefit obligation and accumulated benefit obligation was CHF 4,521 million and CHF 4,497 million as at 31 December 2005 (2004: CHF 3,755 million and CHF 3,735 million, 2003: CHF 944 million and CHF 930 million). The fair value of plan assets for these plans was CHF 3,789 million as at 31 December 2005 (2004: CHF 3,166 million, 2003: CHF 677 million).