Considerations in foreign currency need to be converted into Swiss francs for the purposes of calculating the domestic tax and the reverse charge at the time the tax claim arises. The calculation of the recoverable input tax is based on the consideration at the time the input tax is deductible.
For the conversion, either the monthly average rate published by the Federal Tax Administration FTA or the daily exchange rate (sell) can be used. Taxable persons who are part of a group can use their internal group exchange rate for the conversion.
Source estv.admin.ch
