IFAs are warning clients to think carefully before opening pre-cash ISA accounts describing them as nothing more than "marketing gimmicks".
They are warning clients that the products will tie them to companies that will not be offering the best ISA products in April.
And if they shop around they will find that other building societies and high street banks are offering more attractive interest rates for their cash.
Chase de Vere consultant Justin Modray says: "These companies are attracting investors by offering them cash incentives to transfer their money into ISAs in April. The problem with this is that consumers will be tied to these companies which will not be offering the best rates for ISAs."
The seven companies are Abbey National, Barnsley Building Society, Birmingham Midshires, Halifax, Lambeth Building Society, Market Harborough Building Society and Sun Bank are offering the products.