The prizes in Marit Sveeas International Bridge Tournament are subject to taxation according to Norwegian Law for all foreign players. 
(Norwegian players have to report their prize in their annual tax report)

The current tax rate is 15% - but various costs can be deducted before taxation. These costs are among others travel expenses, hotel expenses and subsistence.

Viego, the accounting firm for the Norwegian Bridge Federation, will help all participants with the taxation. Please do keep all recipts for your costs participating in the tournament, as those are needed.

More info are found on Skatteetatens webpage.