However, there is a limit to how much you can save or invest in an ISA, we explain.How do ISA limits work?Each year HMRC set an annual ISA allowance that specifies just how much you can pay into ISAs for the next tax year.They now specify a total ISA allowance that can be split between an Investment ISA and a Cash ISA in any proportion you like, or paid into just one type of ISA.How much can I sav