Cash ISA

A Cash ISA is the simplest way to save money without paying tax on the interest. It works just like a normal savings account — except the interest you earn is completely yours to keep. No tax. No forms. No fuss. If you have money sitting in a regular savings account earning interest, a Cash ISA could be doing the same job — but better. We can connect you with a specialist who can help you find the right one.

FCA Regulated| FCA No. 1038034| Free Savings Adviser Introductions| Est. August 2019| Verify on FCA Register

The key numbers — no jargon

£20,000you can save into ISAs each tax year — all of it can go into a Cash ISA if you want
0%tax on the interest you earn inside a Cash ISA — no matter how much it grows
FSCSprotected up to £85,000 per provider — your money is safe if the bank fails
18+you need to be 18 or over to open a Cash ISA (changed from 16 in April 2024)
📌 What changed in April 2024 Two important updates: First, the minimum age for a Cash ISA rose from 16 to 18. If you are 16 or 17, a Junior ISA is still available. Second, you can now pay into more than one Cash ISA in the same tax year — so you can split your savings across providers to chase the best rates. Your total across all ISAs still cannot exceed £20,000 per tax year.

With interest rates higher than they have been for years, a Cash ISA has become genuinely useful again. If you are a basic rate taxpayer, you can earn up to £1,000 in interest tax-free outside an ISA each year — but if you are a higher rate taxpayer, that drops to just £500. Once you go over those limits, you pay tax on the rest. A Cash ISA removes that limit entirely.

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Building Savings? Protect Your Income Too.

Savings give you a cushion — but if you cannot work due to illness or injury, even a healthy savings pot can drain quickly. Income protection insurance replaces your income if you are off sick, so your savings stay intact for the goals you built them for.

Find out about income protection

Types of Cash ISA — what are your options?

Easy access Cash ISA

Save and withdraw whenever you like. Rates are variable — they can go up or down. Best for your emergency fund or money you might need at short notice.

Fixed rate Cash ISA

Lock your money away for a set period — typically one to five years — in exchange for a guaranteed interest rate. Good if you know you will not need the money and want certainty.

Notice Cash ISA

A middle ground — you can access your money, but you need to give notice first (typically 30, 60, or 90 days). Often pays a better rate than easy access.

Flexible Cash ISA

A flexible ISA lets you withdraw money and put it back in the same tax year without losing your allowance. Not all Cash ISAs are flexible — worth checking before you open one.

Cash Lifetime ISA

For first-time buyers aged 18–39. Save up to £4,000 per year and get a 25% government bonus — up to £1,000 per year. Can only be used for a first home or accessed at 60.

Not sure which type?

The right Cash ISA depends on when you might need the money and whether you want a guaranteed rate. A specialist can compare the market and find the best option for your situation.

Cash ISA vs regular savings account — which is better?

Both hold your money safely and pay interest. The difference is tax. Here is a plain-English comparison.

Feature Cash ISA Regular savings account
Tax on interest ✓ None — ever Taxed above your Personal Savings Allowance (£1,000 basic rate / £500 higher rate)
FSCS protection ✓ Up to £85,000 per provider ✓ Up to £85,000 per provider
Annual limit Up to £20,000 per year (shared across all ISAs) No limit
Tax return needed? ✓ No Yes, if interest exceeds your allowance
Best for Savers who pay tax on interest, or who want simplicity Savers well within their Personal Savings Allowance

If you are a basic rate taxpayer with modest savings, a regular account may be fine. But if you are a higher rate taxpayer, have significant savings, or simply want to keep things simple and tax-free, a Cash ISA is the smarter choice.

When a Cash ISA makes the most sense

You are a higher rate taxpayerYour Personal Savings Allowance is only £500. With interest rates where they are, it is easy to exceed that — and a Cash ISA removes the problem entirely.
You want your emergency fund to work harderAn easy access Cash ISA earns tax-free interest on your emergency fund — so your safety net is also quietly growing.
You are saving for something specificA fixed rate Cash ISA gives you a guaranteed return over a set period — useful if you are saving for a home, a car, or a big family expense.
You want simplicityNo investment decisions, no market risk, no tax return. A Cash ISA is the most straightforward way to save tax-efficiently.
You are a first-time buyerA Cash Lifetime ISA gives you a 25% government bonus on top of your savings — up to £1,000 per year — specifically to help with a first home deposit.
You want to protect future savingsEven if you are within your allowance now, rates and allowances can change. Sheltering savings in an ISA now protects them from future tax changes.

How to get connected to a savings specialist

1

Get in touch

Tell us you are interested in a Cash ISA and a little about your situation — how much you want to save, whether you need easy access, and your goals. No forms, no pressure.

2

We make the introduction

We introduce you to a savings specialist we know and trust. The introduction is warm — they will know your situation before they call.

3

The specialist finds the best rate

They will compare the market, identify the right type of Cash ISA for your needs, and help you get set up quickly and simply.

4

Your savings start working harder

Your money earns tax-free interest from day one — with no ongoing admin and no tax return to worry about.

Get Your Free Cash ISA Introduction

Cash ISA questions answered

Is a Cash ISA safe?
Yes. Cash ISAs held with UK-authorised banks and building societies are protected by the Financial Services Compensation Scheme (FSCS) up to £85,000 per provider. Your money is not invested in the stock market — it earns interest and the amount you put in cannot go down. If you have more than £85,000 to save, spreading it across more than one provider keeps it all protected.
Can I transfer my existing Cash ISA to get a better rate?
Yes — and you should if your current rate is poor. You can transfer a Cash ISA to a new provider without losing your ISA status or your tax-free history. The key rule is to use an official ISA transfer rather than withdrawing the money yourself — if you withdraw it, it loses its ISA status and counts against your current year’s allowance when you put it back in. A specialist can manage the transfer for you.
Can I pay into a Cash ISA and a Stocks & Shares ISA in the same year?
Yes. You can split your £20,000 annual ISA allowance across different types of ISA in the same tax year — for example, £10,000 into a Cash ISA and £10,000 into a Stocks & Shares ISA. Since April 2024, you can also pay into more than one Cash ISA in the same year, so you can spread your savings across providers to chase the best rates.
What is the Personal Savings Allowance and why does it matter?
The Personal Savings Allowance (PSA) is the amount of interest you can earn outside an ISA before paying tax. Basic rate taxpayers get £1,000 per year; higher rate taxpayers get £500; additional rate taxpayers get nothing. With savings rates higher than they have been for years, many people are now exceeding their PSA without realising it — and paying tax on the excess. A Cash ISA removes this problem entirely, because interest inside an ISA is always tax-free.
What happens to my Cash ISA if I die?
If you are married or in a civil partnership, your spouse or civil partner can inherit your ISA allowance through an Additional Permitted Subscription (APS). This means they can add the value of your ISA to their own ISA allowance, on top of their usual £20,000, preserving the tax-free status of the savings. This does not happen automatically — they need to apply. A financial adviser can help with this.
Is the introduction really free?
Yes — we make the introduction at no cost to you. The savings specialist will explain their service and any costs clearly before you make any decision.

Explore all ISA types

Investments HubBack to the main investments page — explore all your options in one place. Stocks & Shares ISAInvest your ISA allowance for potentially higher long-term growth — for money you will not need for five years or more. Junior ISA (JISA)Tax-free saving and investing for your children — up to £9,000 per year, accessible at 18. Lifetime ISA (LISA)25% government bonus for first-time buyers and retirement saving — for adults aged 18 to 39.
Written by Ben Tomlin — Financial Adviser, That’s Family Finance (a trading style of RB Ame Ltd).
Qualifications: Level 4 Diploma in Financial Advice · Level 3 Certificate in Mortgages & Protection · Level 3 Certificate in Equity Release.
FCA Individual Reference Number: BXT01420 · Last reviewed: August 2026.
Important information: That’s Family Finance is a trading style of RB Ame Ltd, authorised and regulated by the Financial Conduct Authority (FCA No. 1038034). Our FCA permissions cover protection insurance only. We do not provide savings or investment advice. Where we introduce clients to savings specialists or advisers, those introductions are to separately authorised or regulated firms. FSCS protection applies to eligible deposits with authorised firms — check the FSCS website for details. ISA and tax rules are based on current legislation for the 2025/26 tax year and may change. This page is for information only and does not constitute financial advice.