Introduction of ISAs ISAs were introduced on NUMBER@1 April NUMBER@2 , replacing the earlier Personal Equity Plans -LRB- PEPs -RRB- and Tax-Exempt Special Savings Accounts -LRB- TESSAs -RRB- , which continued to exist only for money already invested in them and for interplan transfers .

Before that , Personal Equity Plans -LRB- PEPs -RRB- and Tax-Exempt Special Savings Accounts -LRB- TESSAs -RRB- where used .
