One little-known fact about Individual Savings Accounts (ISAs) is that it is possible for investors in maturing Tessas to transfer up to pounds 9,000 of the capital from one tax-free plan to another - in addition to the pounds 5,000 annual investment limit (pounds 7,000 in 1999/2000). National Savings is launching a Tessa-only ISA, paying 5.75 per cent. The rate paid is guaranteed to match base rates until April 2000. The ISA meets the Treasury's voluntary CATmark scheme, requiring it to have low charges, easy access and fair terms. There is access to savings without notice period, charges or loss of interest for withdrawals.