Beleaguered high street department chain BHS will file for administration today, threatening almost 11,000 jobs.
A spokesman for the retailer said the 88-year-old business will call in administrators after being unable to secure a rescue package to save the firm. A formal announcement is expected just before noon.
BHS was bought last year by a consortium called Retail Acquisitions for £1 from retail entrepreneur Sir Philip Green.
The retailer has debts of more than £1.3 billion, including a pension fund deficit of £571 million.
Sir Philip is reported to have offered £80 million towards the cost of BHS pensions, though the regulator could still pursue further payment from the retail billionaire.
Sir Philip bought BHS for £200 million in 2000.
Rival retailer Sports Direct is understood to want to some of BHS's 164 stores, but will only do so if it does not have to take on any pension liabilities.
Shopworkers' trade union Usdaw said it was "seeking urgent clarification from the company".
The collapse of BHS would be the biggest retail failure since Woolworths folded in 2008 with the loss of almost 30,000 jobs.
Retail experts said BHS has suffered from years of under-investment, leaving its range and estate looking tired.
The fashion and homewares chain was thrown a lifeline last month when creditors backed two company voluntary arrangements (CVA) designed to revive its ailing business by cutting the cost of its leases and preventing widespread store closures.
However, the deal hit problems last week when a £60 million loan, making up a crucial part of the deal, had not been secured.
Joe Rundle, head of trading at ETX Capital, said: "BHS may have been another Woolworths that struggled to adapt to the new retail world.
"But the same pressures that squeezed the life out of BHS are being felt across the UK retail sector today."
The owner of BHS, Dominic Chappell, has said that "no one is to blame" for the retailer's imminent collapse.
Speaking to the Press Association, Mr Chappell said: "No one is to blame, it was a combination of bad trading and not being able to raise enough money from the property portfolio. In the end, we just couldn't reach an agreement with Arcadia over pensions."
He added that he will continue to work with the administrators Duff & Phelps to "find a solution post the administration".