The company operates Millers, Rockmans, Noni-B, Rivers, Katies, Autograph, W.Lane, Crossroads and Beme.

Mosaic Brands executives have not yet announced which of their 1400 or so stores across Australia will be affected.

Gunnedah is home to a Millers store, on Conadilly St.

Tamworth is home to seven of the company's stores - Millers, Noni B, Rockmans, Rivers, Katies, Autograph and W.Lane.

Inverell has a Millers store and Narrabri has both a Millers and a Rockmans.

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Armidale has three stores, including Millers, Noni B and Katies.

About 6000 people are employed by Mosaic Brands nationally.

The announcement to shareholders said Mosaic Brands would shut between 300 to 500 stores within the next 12 to 24 months, though their locations were yet to be confirmed.

The retail giant announced its end of financial year results on Tuesday, and Mosaic chief executive officer Scott Evans told shareholders the company had been left ravaged by unfortunate events.

"The forecast was utterly derailed, first by the devastating bushfires which directly impacted 20 per cent of our store portfolio over the Christmas period, then by COVID-19 which saw us close all 1333 stores for 9.5 weeks, including the peak Mother's Day trading period," he said.

"The retail rental market in Australia is not paused because of the pandemic, it is fundamentally changed for the future.

"There is no road map to navigate these circumstances, but our operational priorities have been ensuring team and customer safety, reducing inventory and maintaining a strong cash position."

Results included underlying earnings before interest, tax, depreciation and amortisation (EBITDA) loss of $45.8 million, which included a provision of $49 million for unpaid rent.