You must be a UK resident aged 18+. You can only subscribe to one cash ISA with Royal Bank in the current tax year up to £20,000. Tax free interest means interest payable is exempt from UK income tax. Tax reliefs referred to are those applied under current UK legislation, which may change.
Over longer periods of time (five years or more), investments such as stocks, shares and funds have the potential to give you higher returns compared to cash savings. But the value of investments can fall as well as rise. There is a chance you may get back less than you put in. Ensure you have safety net savings before starting to invest. Eligibility criteria, fees and charges apply.