These savings accounts aren't tax-free Isas, so any interest you earn over your personal savings allowance will be taxed. Investec is a large investment services provider but also offers cash savingsIsas – or individual savings accounts – let you save up to £20,000 a year tax free and rates on these are also strong. You can get a higher Isa rate if you're willing to fix, with RCI Bank offering a two-year fix at 4.80 per cent. Cash returns are at their highest in over a yearThe rates scrutineer Moneyfacts says that savings rates across all savings accounts – including easy-access accounts and Isas – sit at 3.59 per cent. Watch out for tax chargesRemember that earnings within savings accounts that have no Isa wrapper are taxable.