KFC, Pizza Hut, Carl Jr and Starbucks workers will go on strike tomorrow as their union attempts to negotiate a new collective agreement and higher hourly rates.
Unite Union National Secretary Gerard Hehir said the brands' owner Restaurant Brands has more than enough profit to pay its workers more.
"Restaurant Brands has rejected a very modest proposal from the union for a rise of 10 cents and hour each year over three years above the minimum wage movement for the lowest paid workers ... this will take their pay to 30 cents an hour above the minimum wage by 2019," a statement said.
"While Restaurant Brands have been paying huge bonuses and dividends and buying up large overseas, their workers are overworked and underpaid".
The statement said workers currently had no form of redundancy payment clause in their contracts, and Restaurant Brands is only required to give them one weeks' notice before cancelling their employment.
Picket lines will be set up from midday in Auckland, Rotorua, Palmerston North, Wellington, Christchurch and Dunedin.
Restaurant Brands was not immediately reachable for comment.
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