Carl's Jr, owned by NZX-listed Restaurant Brands New Zealand, posted a 3.9 per cent decline to $34.9m in the year ended February 26.
Despite the muted sales performance, the burger chains' bottom lines were mixed. Of the majors, McDonald's local profit rose 28 per cent to $67.7m, while Burger King posted a profit of $3.1m versus $3.8m in the prior year, a drop of 18 per cent.
BurgerFuel's net loss was $463,999, which it said was due to costs associated with the initial establishment and later exiting of the US, which all occurred within the period.
Carl's Jr improved its profitability, doubling earnings before, interest, tax, depreciation and amortisation to $2m.
The local McDonald's division paid $30m to its US parent, unchanged from a year earlier.
The latest data from Statistics NZ showed there were increases in restaurant meals and ready-to-eat food prices, up 2.9 per cent on the May year.
Restaurant meal prices rose 2.7 per cent while ready-to-eat food prices lifted 3.1 per cent.
The minimum wage increase of 75 cents to $16.50 an hour on April 1, 2018 may be a partial factor for these price increases, the statistics agency said.
On the staffing front, McDonald's NZ wage bill shrank 12 per cent to $48.2m in 2017, while Burger King NZ spent $55.6m on salaries, up 0.9 per cent.
Staffing issues at Burger King are in the limelight after 92 per cent of union members who work at the fast food operation voted to start strike action today over pay, hours and health and safety.
"They need to spend a lot more on salaries," Unite Union national secretary Gerard Hehir told BusinessDesk in an email.
"Most of any increase probably comes from the tightening up of work visas. It is now very difficult to get visas for store level manager positions. We have noticed that the number of migrant visa managers in store has been dropping recently and the reality is that citizens and permanent residents feel more secure to refuse to work unpaid hours so their costs may well have increased. Unpaid work, unfortunately, it is still common though and a major issue in this dispute," he said.
The statements showed Burger King's total equity was $77.7m as at December 31, having accumulated losses of $21.4m. It had a net working capital deficit of $9m at the balance date which the directors said can be funded by operating cash flows and available borrowing facilities.
They adopted a going concern assumption, however, that is dependent on the group's continued access to banking facilities, something they said they are confident of.
"They are owned by the private equity group Blackstone - known worldwide for buying assets short to medium term, loading them with debt to reduce 'profits' in the country and squeezing them hard before flicking them off," Unite's Hehir said.
The local Burger King holding company "has been highly leveraged to make a 'loss' and we think this guy can afford to pay managers more than the minimum wage."
