This excerpt taken from the RIG DEF 14A filed Nov 3, 2008.
Refund of Swiss Withholding Tax on Dividends and Other Distributions
Swiss Holders. A Swiss tax resident, corporate or individual, can recover the withholding tax in full if such resident is the beneficial owner of the Transocean-Switzerland shares at the time the dividend or other distribution becomes due and provided that such resident reports the gross distribution received on such residents income tax return, or in the case of an entity, includes the taxable income in such residents income statement.
Non-Swiss Holders. If the shareholder that receives a distribution from Transocean-Switzerland is not a Swiss tax resident, does not hold the Transocean-Switzerland shares in connection with a permanent establishment or a fixed place of business maintained in Switzerland, and resides in a country that has concluded a treaty for the avoidance of double taxation with Switzerland for which the conditions for the application and protection of and by the treaty are met, then the shareholder may be entitled to a full or partial refund of the withholding tax described above. You should note that the procedures for claiming treaty refunds (and the time frame required for obtaining a refund) may differ from country to country.
Switzerland has entered into bilateral treaties for the avoidance of double taxation with respect to income taxes with numerous countries, including the United States, whereby under certain circumstances all or part of the withholding tax may be refunded.
U.S. Residents. The Swiss-U.S. tax treaty provides that U.S. residents eligible for benefits under the treaty can seek a refund of the Swiss withholding tax on dividends for the portion exceeding 15% (leading to a refund of 20%) or a 100% refund in the case of qualified pension funds. Please refer to the discussion under U.S. Federal Income Tax ConsiderationsU.S. HoldersTaxation of Distributions on the Transocean-Switzerland Shares for applicability of U.S. foreign tax credits for any net withholding taxes paid.
As a general rule, the refund will be granted under the treaty if the U.S. resident can show evidence of:
The claim for refund must be filed with the Swiss federal tax authorities (Eigerstrasse 65, 3003 Berne, Switzerland), not later than December 31 of the third year following the year in which the dividend payments became due. The relevant Swiss tax form is Form 82C for companies, 82E for other entities and 82I for individuals. These forms can be obtained from any Swiss Consulate General in the United States or from the Swiss federal tax authorities at the address mentioned above. Each form needs to be filled out in triplicate, with each copy duly completed and signed before a notary public in the United States. You must also include evidence that the withholding tax was withheld at the source.
Stamp Duties in Relation to the Transfer of Transocean-Switzerland Shares. The purchase or sale of Transocean-Switzerland shares may be subject to Swiss federal stamp taxes on the transfer of securities irrespective of the place of residency of the purchaser or seller if the transaction takes place through or with a Swiss bank or other Swiss securities dealer, as those terms are defined in the Swiss Federal Stamp Tax Act and no exemption applies in the specific case. If a purchase or sale is not entered into through or with a Swiss bank or other Swiss securities dealer, then no stamp tax will be due. The applicable stamp tax rate is 0.075% for each of the two parties to a transaction and is calculated based on the purchase price or sale proceeds. If the transaction does not involve cash consideration, the transfer stamp duty is computed on the basis of the market value of the consideration.