Fixed term ISA with guaranteed
interest

With Smart ISA from Zopa, you can choose a Fixed Term ISA pot - so you’ll know that your savings will earn a guaranteed interest rate, every month. That’s one thing off your mental load.

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Start with just £1
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Earn up to 4.05% fixed AER
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Guaranteed interest rate for 1-5 years
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Personal Savings Provider of the Year - Moneynet, 2025

Tax treatment depends on your individual circumstances and could change. You can save up to £250,000 across your Smart Savings Hub pots.

Open your fixed term ISA

Download the Zopa app, open a Smart Saver account, and then choose Smart ISA. That’s it! Guaranteed interest, here you come.

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What is a fixed term ISA?

A fixed term ISA, or individual savings account, is where you agree to put aside up to £20,000 of your money away for a certain amount of time, usually at least 1 year, in return for a guaranteed interest rate. Like with other kinds of ISA, you don’t have to pay any income tax on the interest you earn.

Explore our fixed term ISA rates

Access ISA pots

AER*Gross** variableAccess money

3.25%3.20%Access Anytime

Fixed Term ISA pots

4.05%3.97%1 year term

4.00%3.92%2 years term

3.90%3.83%3 years term

3.80%3.73%4 years term

3.80%3.73%5 years term

*AER stands for 'annual equivalent rate'. We pay you interest on a monthly basis, but AER shows you the rate you’d get if this monthly interest was compounded and paid once a year instead. We provide an AER to make it easier for you to compare our rates with other providers.

**We pay gross interest, which means nothing is deducted for tax.

Tax treatment depends on your individual circumstances and could change in the future.

The interest rates shown may change if we update them whilst you’re browsing.

Download our app to start saving

Benefits of a fixed term ISA

Pop your money in a fixed term ISA and watch it grow, with tax-free interest paid monthly at competitive rates.

Guaranteed interest rate

Earn between 3.80% and 4.05% AER.

Is a fixed term ISA right for you?

A fixed term ISA could be for you if…

You want a guaranteed return
You’re saving for a specific goal
You’re happy to lock a lump sum of money away for 1-5 years

A fixed term ISA might not be for you if…

You want easy access to your money - try our easy access Cash ISA instead.
You want to deposit money regularly
You’re not a UK resident

Fixed term savings with Smart ISA

How Smart ISA works

One Cash ISA, multiple ISA pots
Put your money in a Fixed Term ISA pot for a set interest rate
Open with just £1
Add as much as you like, within your ISA allowance, in the first 30 days of opening.

Transfer an existing ISA

Transfer via the app in just a few taps
Move at least £500
Your money will land in your Smart ISA within 15 business days

At the end of your term

We’ll move your money to an Access ISA pot
Take it out or reinvest it - whatever you want

If you need to access your money before your term ends

Your Fixed Term ISA pot will close
You’ll pay a penalty

Open your Smart ISA

Download the Zopa app.

A few things to think about before you apply

With a fixed term ISA, you’re locking your money away for between 1-5 years
You won’t be able to access your money before your term ends without paying an interest charge
A fixed term ISA isn’t flexible: any money you take out within a tax year can’t be replaced

How to open a fixed term ISA with Zopa

Download the Zopa app
Head to the Smart Savings Hub and open a Smart Saver account
Apply for your Smart ISA in minutes - no forms or paperwork
Choose the Fixed Term ISA pot - that’s your fixed term ISA
In the first 30 days, pay in at least £1 or follow the steps to transfer an existing ISA

Why choose Zopa?

Best Savings App, MoneyNet 2025
Personal Savings Provider of the Year, MoneyComms 2024
Best Regular Savings Provider, MoneyNet 2024
Award-winning customer service

Your money's secure

Your eligible deposits, meaning the money you hold with Zopa, are protected up to a total of £120,000 by the Financial Services Compensation Scheme (FSCS), the UK's deposit guarantee scheme. Any money you hold above this limit is unlikely to be covered.

People often ask us

With a fixed term Cash ISA, you lock your money away for a certain number of years in return for a steady, guaranteed interest rate. You usually have to deposit your money within a certain timeframe - with Zopa, that’sthe first 30 days of opening your ISA. If you want to withdraw money from your fixed term ISA before the term ends, you will be charged a penalty.

Easy access Cash ISAs have a variable interest rate, so how much your money grows could change each month. With easy access ISAs, you can pay in money and take it out whenever you like with no penalty.

Fixed term ISAs typically offer a higher interest rate than easy access ISAs, so you could end up earning more interest overall.

Tax-free, or tax-efficient, refers to when you don’t pay any income tax on the interest you earn from your savings. ISAs are tax-free, while interest on other savings accounts is typically eligible for tax. This means ISAstypically let you keep more of the interest you earn on your savings compared to non-ISA savings accounts. Remember that tax treatment depends on your individual circumstances and could change.

Start saving in a fixed term ISA

Download the Zopa app, open your Smart ISA and pop in as little as £1 to get going.

Meet our Stocks & Shares ISA

A Cash ISA keeps your savings secure. A Stocks & Shares ISA puts your money to work for the long term. Choose from 2 ready-made funds and get started in minutes - all tax-free, all in one place. The value of your investments can go up or down, so you could get less money back than you put in.

Explore our Stocks & Shares ISA

Fixed term ISA with guaranteed interest