Payday lender Wonga has reported a pre-tax loss of £37.3 million for 2014 after revenues declined by 31% on a year earlier.
It slumped into the red after revenues fell by almost £100 million last year.
The firm's figures follow a significant drop in UK consumer lending while the controversial lender attempts to clean up its tarnished image.
Revenues declined to £217.2 million in the period.
We know it will take time to repair our reputation and gain an accepted place in the financial services industry, but we're determined to deliver on our plans and serve our customers in the right way.
Wonga has announced restructuring which expected to lead to the loss of 325 jobs.
The payday lender currently employs around 950 people and said the losses come as it aims to, "refocus on its consumer businesses."
Wonga can no longer sustain its high cost base which must be significantly reduced to reflect our evolving business and market. Regrettably, this means we’ve had to take tough but necessary decisions about the size of our workforce. We appreciate how difficult this period will be for all of our colleagues and we’ll support them throughout the consultation process.
325 jobs are to go at Wonga as part of "a restructuring and cost reduction programme".
The move is hoped to save the company £25 million over the next two years. Wonga said costs at the company tripled between 2012-2014.
There will now be a 30 day consultation period for those who are at risk of losing their jobs.
Wonga will not face a criminal investigation after it sent customers fake legal letters, police have confirmed.
City of London Police said that, after a "thorough review", it concluded "there is not sufficient evidence to progress a criminal investigation."
Last June, the payday lender agreed with the City regulator to pay £2.6 million in compensation for the letters it sent from non-existent law firms.
Payday lender Wonga would not be on a list of potential Church of England investments despite undergoing a number of reforms, Archbishop of Canterbury Justin Welby has said.
The Church of England's investment in Wonga, which has since ended, attracted criticism last year, and the Archbishop has since said he hoped to compete the company "out of existence" by supporting credit unions.
He told ITV News Business Editor Joel Hills that though new rules had made payday lending "more legitimate than it was", they still represented a very expensive way to borrow money.
An advert for payday lender Wonga has been banned for failing to disclose the relevant cost of borrowing.
The television ad showed a man anxiously jotting down figures on a napkin before looking at his phone calculator and seeing the amount of £153.79.
An elderly lady than said: "You appear to be in a financial quandary, young fellow. At Wonga you choose exactly how much to borrow and for how long," and then adding: "You can even pay back early and save money."
The Citizens Advice Bureau complained the ad breached regulations by omitting the representative annual percentage rate (RAPR), as it understood that the claim "you can even pay back early and save money" was an incentive likely to trigger the requirement to disclose it.
The Advertising Standards Authority (ASA) ruled that the ad must not appear again in its current form. Last week Wonga announced it had written off £220 million of debt belonging to 330,000 customers after admitting making loans to people who could not afford to repay them.
Wonga's admission that it lent to people who could not afford repayments is a "symptom of a wider problem" in the payday loans industry, the Citizens Advice Bureau has said.
Rachael Badger told ITV News said the CAB had been hearing that many companies were not properly checking whether customers could afford repayments.
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The number of people "rolling over" their payday loans into a second month or more has reduced by three-quarters since tighter of the industry came into effect, an association representing the industry has said.
Many lenders allow customers to renew their borrowing month-on-month if they are unable to afford repayments - usually incurring extra costs.
Russell Hamblin-Boone, Chief Executive of the Consumer Finance Association, said Wonga's announcement of redress for thousands of customers who had fallen into arrears was representative of "the new lending landscape".
Tighter affordability checks from the Financial Conduct Authority had also meant a dramatic fall in the number of payday loans had been granted, he added.
Hamblin-Boone pointed out that a new "cost of credit cap" on the industry would control the prices of the loans, while further measures restricting the industry are due to be announced before the end of the year.
Archbishop of Canterbury Justin Welby has welcomed Wonga's decision to write off the debts of 330,000 customers whose loans would not have been made under new affordability criteria.
He said the move was an effort to put right some of the things that have gone wrong in the past and the finance industry should be "a good servant not a bad master". But the head of the Anglican Church said the major issue was to create a reformed financial system.
"The big issue is to create a financial system that gives access to the poor and hope for the poorest in our lands, to be able to flourish and develop and have proper access to finance, not just for loans but for savings. For lives in which finance is a good servant, not a bad master."