 A help to buy ISA, introduced in 2015, is a form of cash ISA that receives a government bonus if the money is used in paying the deposit on a first home purchase.The usual rule that any number of accounts can be held with the same ISA manager applies, and many providers offered the ability to hold both HTB and other cash ISA accounts with current year money in them.However, only one HTB ISA in total could be held so if it was desired to put current year money into the HTB ISA, all other cash ISA current year money also had to be paid into a cash ISA with the same provider.