Bank of Cyprus depositors with more than 100,000 euros (£84,300; $128,200) could lose up to 60% of their savings as part of an EU-IMF bailout restructuring move, officials say.
The central bank says 37.5% of holdings over 100,000 euros will become shares.
Up to 22.5% will go into a fund attracting no interest and may be subject to further write-offs.
The other 40% will attract interest - but this will not be paid unless the bank performs well.
It was known that the wealthiest savers at the Bank of Cyprus would take a large hit from the bailout deal - but not to this extent, the BBC's Mark Lowen reports.
