An unprecedented overspend by hospitals and other NHS trusts is expected to be announced later by health bosses.
The figures for England from the regulator NHS Improvement cover the 2015-16 year, which finished in March.
By December – the three-quarter mark – hospital, ambulance and mental health trusts were already £2.2bn in the red.
That is predicted to have grown in the last three months of the year with experts warning the pressure it puts hospitals under has an impact on care.
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When the three-quarter year figures were released, just seven of the 138 hospital trusts were in surplus.
Overspending on agency staff was highlighted as one of the major problems as well as rising demand for services.
Last year NHS trusts finished over £800m in the red – with the health service as a whole balancing the books only after a cash injection from the Treasury and by raiding the capital budget.
The rest of the UK does not release equivalent figures as hospitals are not run as autonomous organisations as they are in England.
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Source:: BBC UK