Coventry Building Society will introduce a new two-year fixed rate ISA later this week.
The minimum balance for the ISAs is set at £3,000 at a rate of 5.25 per cent per annum.
Coventry Building Society, UK's fifth largest building society, has guaranteed that the rate of interest will remain fixed until March 31st, 2007.
Martin Ritchley, chief executive, maintains that mini cash ISAs enable investors to maximise the return on their tax-free savings.
"Customers with existing Coventry Building Society accounts and those of other organisations can transfer in their previous years' tax free savings and benefit from a competitive fixed rate."
It will also allow mini cash ISA transfers.
Coventry has said that the new ISA will be available for a limited period only.




