But no matter which of these you go for, you will be subject to a limitation on how much can be put in over the course of a tax year
. However, this allowance was revised by the government, which means there is now even more opportunity to save tax-free. From April 6th 2010, all eligible savers can put up to 5,100 into a cash ISA. Alternatively, you can now put anything up to 10,200 into a stocks and shares ISA - less anything you have already put into a cash option.