The 18 month term is unique in the cash ISA market and offers more choice for savers seeking competitive returns which are tax free.
The ISA personal allowance was increased last July to £15,000 for the current financial year.
Kim Rebecchi, Leeds Building Society’s Distribution and Marketing Director, said:
“Our unique new ISA with an 18-month maturity complements our existing range of competitive Fixed Rate Cash ISAs.
“In addition to the attractive rate of return, it offers savers more choice about how long they want to lock in their investment and can be opened with as little as £100.
“Transfers in of ISA subscriptions from previous years are permitted and, as with our other Fixed Rate Cash ISAs, savers can enjoy penalty-free access of up to 25% of their initial investment.”