
The actuarial valuation of pension provisions is performed using the projected unit credit method in accordance with IAS 19. The following parameters were applied in computing pension provisions:
| Trend in salary increases: | 1.5 % |
| Trend in pension increases: | 1.5 % |
| Discount factor: | 4.6 % |
The following parameters were taken into account in computing a large portion of the provisions for mining obligations:
| Trend in price increases: | 1.5 % |
| Discount factor: | 5.0 % |
| Income taxes | |||
| € million | Q1/06 | Q1/05 | |
| Corporation tax | 8.0 | 4.0 | |
| Trade tax on income | 12.9 | 9.6 | |
| Foreign income taxes | 4.0 | 5.1 | |
| Deferred taxes | 30.2 | 34.0 | |
| Income taxes | 55.1 | 52.7 |
Noncash deferred taxes result from tax loss carryforwards as well as other temporary tax-related measurement differences, especially changes in the market value of our options.
There have been no significant changes in contingent liabilities in relation to the annual financial statements for 2005 and they can be classified as immaterial overall.