Explain An ISA Allowance In Plain Terms

You've put some money into an ISA this year, can't remember how much, and the tax year end is creeping up. This explains how the allowance works with your actual numbers, including what happens if you don't use it all. Good before you make a last minute decision.

Explain how the ISA allowance works using the tax year and amount the person has already used, given below. Cover what happens if the allowance isn't used by the end of the tax year and how different ISA types share the same overall allowance. Do not recommend a specific ISA provider or product. Keep the explanation under 180 words. Details: {ISA_DETAILS}