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ISA allowance guide


Investing or saving within an Individual Savings Account (ISA) allows you to avoid paying tax of up to 45% on your returns. So, with rates on savings accounts currently so low, this makes good sense.

But you can’t just shelter all your savings from the taxman in an ISA. HM Revenue & Customs (HMRC) sets a limit, known as the ISA allowance, in each tax year. Tax years run from April 5 to April 6.

To get you started, here’s your guide to this year’s ISA allowance.

How is the ISA allowance calculated?

The ISA allowance, which generally goes up slightly every tax year, is calculated using the inflation figure as measured at September of the previous year. The inflation measure used for this purpose is the Consumer Prices Index (CPI).

It’s a better idea to take advantage of your ISA allowance as soon as possible once the new tax year starts so that you don’t miss out

What is the ISA allowance for this tax year?

The current total ISA allowance (for the tax year 2014/2015) is £15,000. At the start of the tax year, the ISA allowance was £11,880, with this uplift based on the September 2013 inflation figure of 2.7%, plus an element of rounding up. However, in the March 2014 Budget, the Chancellor announced that the allowance would increase to £15,000 with effect from July 1, 2014.

Who calculates the ISA allowance?

The annual ISA allowance is set by HMRC and confirmed by the Chancellor of the Exchequer  in his Autumn Statement - a sort of ‘mini Budget’ that takes place towards the end of the year. The Chancellor caught everyone by surprise when in his March 2014 Budget he announced the increase to £15,000 from July 2014, particularly as he’d confirmed an increase to £11,880 in the 2013 Autumn Statement. The limit announced at this point generally stands until the end of the next tax year. 

The 2015/16 allowance is expected to rise in line with inflation as usual, but this will be confirmed in the 2014 Autumn Statement.

Can I save all of my ISA allowance in cash?

Prior to July 1, 2014, you could only invest half your annual ISA allowance into cash. However, since this date, you can invest the full £15,000 allowance into a cash ISA. This is an interest-bearing account that carries no risk, although as interest rates are so low, your returns may be eroded by inflation.

If you don’t want to invest the full £15,000 allowance in cash, you can invest some or all of your allowance in a stocks and shares ISA, which shelters any gains from capital gains tax (CGT) but can go down as well as up in value. 

You can split your allowance any way you want, so, for example, you could put a higher amount into a stocks and shares ISA – say £10,000 – and keep the remaining £5,000  in cash.

Why is there a set allowance?

The government makes a lot of money by taxing savers and investors’ returns, so there has to be a limit on how much each person can save tax-free.

On the other hand, the government also needs to persuade people to save more and permitting a set amount they can earn tax-free is designed to encourage this.

If I don’t use my full allowance can I carry it over to the next tax year?

No. Whether it’s cash or stocks and shares, you won’t be able to carry over any unused allowance to the following tax year, which starts each year on April 6. This means that you have until midnight on April 5, 2015 to use up this year's ISA allowance, or it will be gone for good.

You should always try to make use of your ISA allowance as soon as possible once the new tax year starts to maximise tax-free returns.

Once you have invested the full amount, it’s also sensible to leave it untouched for as long as possible as any money withdrawn will still be counted towards your allowance – even if the tax year is not yet at an end.

What if I go over my ISA allowance?

Under normal circumstances, your ISA providers will not allow you to exceed your allowance – the money will simply be rejected or paid back into the account it came from. If you do manage to exceed the allowance, you will not be entitled to and tax advantages on the overpayments.

The same is true if you open more than one cash or stocks and shares ISA in any one tax year. In either instance, HMRC has a dedicated ISA Helpline (0845 604 1701) that you should call.

What are the best accounts to save my allowance in?

Savings providers usually start unveiling their ISA deals as the new tax year approaches – MoneySuperMarket’s ISA channel is the perfect place to stay up to date with any changes.


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