By Josh Beckerman 
 

Fertilizer company Mosaic Co. (MOS) said Saskatchewan's accelerated taxes on producers of potash, a key ingredient, will increase the company's 2015 potash production tax payments by $80 million to $100 million on a pretax basis.

Saskatchewan said earlier that this month that it would seek to make up for a budgetary shortfall by offsetting declining oil royalty revenue with a change that requires potash producers to spread out tax deductions on capital spending over a longer time frame.

Saskatoon-based Potash Corp. of Saskatchewan (POT, POT.T), the world's top producer of potash, said March 18 that it was "disappointed" by the shift in tax policy, which it expects will cost the company C$75 million to C$100 million (about $60 million to $79 million) in 2015 pretax earnings.

Mosaic Co. said Monday that it is "continuing to assess potential ways to mitigate the increase." Mosaic expects to provide updated guidance on the tax and Canada royalties when it reports earnings April 30.

In February, Mosaic said fourth-quarter earnings more than doubled on higher phosphate and potash sales in anticipation of the spring season, as demand unexpectedly grew after the company cut back on production late last year.

Mosaic, Plymouth, Minn., said in September it would cut back phosphate fertilizer production because of high production costs and sliding grain prices.

Write to Josh Beckerman at josh.beckerman@wsj.com

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