The Norwegian government’s proposal to implement a new 40 percent on the nation's salmon farmers is causing headaches for retailers trying to plan their marketing and sales campaigns for next year.

One of the most hotly debated aspects of the tax is that it would be based on Nasdaq’s average spot price for salmon rather than the actual price a farmer gets for the product.

“This means that if a salmon farmer sells its products below Nasdaq’s calculated price, the farmer would still be liable to pay tax based on the higher price," Nordea seafood analyst Herman Aleksander Dahl told IntraFish.