What is an ISA Account? (Definition of Individual Savings Accounts) 

Individual savings accounts (ISAs) are a way for Britons and UK residents to put away a certain part of their savings each year, without having to pay income tax on the earnings/interest or gains made on those savings.

In other words, the interest yields you earn on these accounts are tax-free.

Let’s assume that you deposited £15,240 into a UK ISA cash account with an annual equivalent rate (AER) of 1.25%.

After 5 years, that amount would rise to £16,222.90, and you wouldn’t have to pay tax on the interest yields.


Start balanceInterest YieldsEnd balance


 £  15,240.00 £191.70  £15,431.70


 £  15,431.70 £194.10  £15,625.80


 £  15,625.80 £196.55  £15,822.35


 £  15,822.35 £199.02  £16,021.37


 £  16,021.37 £201.52  £16,222.90

* Assuming that the interest compounds on a daily basis

What Is an ISA Account (Definition of Individual Savings Accounts)

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See Also:

ISA 101

Interest earned on money deposited into a regular high yield current or savings account is subject to personal income tax deductions based on the individual account holder’s income and personal tax circumstances. 

ISA 101

Image Source: What Is an ISA Account

However, savings that are held in a cash ISA or in a stocks and shares ISA are allowed to grow tax-free – with certain caveats; one of them being a limit on the amount of money that individuals are allowed to put away each year in ISAs.

ISA Allowance

The UK government has an ISA allowance for 2015 of £15,000 per person that can be held in aggregate across various types of ISAs.

For the subsequent tax year, 2015–2016, this ISA limit is set at £15,240 for adults, with a £4,080 limit set for Junior ISAs.

At their very basic, ISAs come in two broad flavours:

  • Cash ISAs: These are accounts that are typically offered by banks and building societies, in which you deposit money (up to your allowable ISA limit) that grows tax-free.
  • Stocks and Shares ISAs: These accounts can be used by investors to buy and hold their favourite stocks and other similar investments. Earnings (in the form of dividends) and capital gains from the stocks are not taxed, allowing you to keep more of your money invested in the stock market for longer.

Which of these two products are well suited for you, and where can you find the best ISA rates for products that meet your needs? 

Click here for additional information and answers to these questions: Review of the Best ISA Rates and Accounts.

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