Apple has written to a regulator threatening to close the iTunes Store if they approve a royalty hike which would see artists receive a 66-percent increase in commission from each song sold through online download services.

Fortune is reporting that the Copyright Royalty Board is expected to rule on Thursday on a proposal from the National Publishers’ Association to increase the rates paid to its members from online services from 9 cents to 15 cents.

Apple is reportedly opposed to the rate rise and has submitted a statement to the board:

“If the [iTunes music store] was forced to absorb any increase in the … royalty rate, the result would be to significantly increase the likelihood of the store operating at a financial loss – which is no alternative at all,” Cue wrote. “Apple has repeatedly made it clear that it is in this business to make money, and most likely would not continue to operate [the iTunes music store] if it were no longer possible to do so profitably.”

The record labels who are reportedly “in no mood to pay the proposed royalty increase” have suggested the CRB to do away with fixed royalties in favor of an 8 percent commission to artists, which would translate to about 5.6 cents on the wholesale cost of each 99 cent track. The Digital Media Association which represents online retailers such as iTunes has suggested an even lower rate of 6 percent, or 4.8 cents per track.