Published: 7 April 2025
Updated on: 6 May 2026
You’ve probably seen the terms ‘cash ISA’ and ‘bond’ when looking at savings accounts. But do you know the difference between the two types of account? Read on to find out.
What's the difference between a bond and a cash ISA?
They’re both ways to put money aside for whatever you’re saving for. But the main difference is that with a cash Individual Savings Account (ISA) you can save and the interest you earn is tax-free. You can also access your money if you need to, though this can come with a loss of interest. With a bond, you’re locking away your money for a fixed amount of time.
How does a cash ISA work in the UK?
A cash ISA allows you to use your annual ISA tax-free savings allowance. It works much like a standard savings account where you deposit funds and earn interest that's free from tax. You need to be 18 or over and a UK resident.
Once you’ve deposited your money, the interest you earn on it will build up and will be paid annually or monthly. You can have a fixed rate cash ISA that has a set interest rate for a period of time or a variable rate cash ISA, so make sure to read the terms and conditions of any cash ISAs you open.
How does a fixed rate bond work?
The concept of a fixed rate bond is simple – put aside your money for a set amount of time and, in return, you'll get a fixed interest rate on your savings. This could make it a good home for a lump-sum, where you can sit back and watch your funds build up.
What does ISA stand for?
It stands for Individual Savings Account. Cash ISAs, as well as other ISA types, such as stocks and shares ISAs, lifetime ISAs and innovative finance ISAs, can only be opened and operated by a single person, unlike other savings accounts which can usually be opened for more than one person.
If you’re a UK resident and aged 18 or over you'll have an ISA allowance for each tax year. Currently the limit is £20,000.
From the 2027/2028 tax year, the annual ISA allowance remains at £20,000, but the government has made a change as to how you’ll be able to use it. If you’re aged under 65, the amount you could save in a cash ISA each tax year will reduce to £12,000. But savers aged 65 and over aren’t affected – they’ll still be able to save their full £20,000 allowance in a cash ISA.
What's a cash ISA account?
It gives you the opportunity to make the most of your annual ISA tax-free savings allowance. There are different types of cash ISA to suit different savings goals. The way they work can change depending on which product you choose, but the interest you earn will be tax-free.
Is a fixed rate bond tax-free?
Fixed rate bonds aren't tax-free.
You’ll pay tax on any interest above your Personal Savings Allowance (PSA).
If you’re a basic-rate taxpayer, you can earn up to £1,000 of interest before having to pay tax. Higher-rate taxpayers earn up to £500 and additional rate taxpayers don't receive any allowance, so will pay tax on all interest they earn.
Can you have a bond and a cash ISA?
Yes, you can have as many bonds and cash ISAs as you need.
You can have multiple fixed rate bonds. Each bond will have a maximum operating balance.
When it comes to cash ISAs, you can open and pay into multiple cash ISAs of the same type in the same tax year. However, you can't pay in more than your annual £20,000 ISA allowance overall. You can also transfer money held in previous tax year cash ISAs, as long as your new cash ISA allows it.
Each provider may limit how many bonds and cash ISAs you can open with them. Check the product details before you apply.
Is a fixed rate bond better than a cash ISA?
It all depends on your circumstances and your reasons for saving. Consider how much you have to save, when you need to access your money and how you want to get the most from your tax-free allowance. Take your time and look at the pros and cons of each product.
We only provide cash ISAs and only allow money to be paid into one cash ISA in each tax year.
The tax treatment depends on the individual circumstances of each customer and may be subject to change in the future
This article is not advice and you should seek independent financial or legal advice if needed.
